HGA Service Manual
Contents
1. 8 Tighten the clamp assembly 1 bolt to 15 20 ft lbs 9 Assemble the steering wheel and tighten the wheel nut to 32 5 37 5 ft lbs 10 If the system has a column support clamp it is extremely important that the jacket tube 6 align with this clamp in the free state If misalignment is evident the HGA unit must be shimmed at the mounting surface to eliminate the misalignment or damage may result to the HGA unit 11 If applicable assemble the horn contact assembly cover gasket and metal cover on the jacket tube 6 Parker Hannifin Corporation Hydraulic Pump Motor Division Greeneville Tennessee Service Manual HGA Hydraguide Bulletin 2751 001 M1 USA Oil amp Hydraulic Fluid FILLING AND AIR BLEEDING THE HYDRAULIC FLUID SYSTEM WHEN DRAINED OF OIL Fill reservoir nearly full Be ready to add oil when the engine is started Do not let oil level drop below the inlet to the power pump so that the power pump will not suck air into the system Start engine and let it idle Immediately add oil to the reservoir as needed NOTE This oil will now be circulating only from the power pump to and through part of the HGA control valve and to the reservoir and back to the power pump When no more oil can be added and oil is clear proceed as follows With one finger on a spoke of the steering wheel spin wheel as rapidly as possible to bleed the air in the steering cylinder s and lines Immediately upon2. Figure HGA 18 NOTE Rotate the input shaft 16 out of the valve spool 22 until input shaft will no longer rotate There will be a gap of approximately 350 between end of valve spool 22 and thrust washer 13 if the drive ring 18 is assembled properly Insert the drive ring 18 into the spool 22 end by visually aligning an internal space on the drive ring with a tooth on the input shaft 16 split and allow the drive ring to drop to the limit of its travel If the drive ring does not engage the input shaft spline a slight rotation of the input shaft will allow the drive ring to become fully engaged Remove torsion bar 20 gage See Figure HGA 18 CAUTION The HGA will not function properly if the correct relationship of spool drive ring and input shaft is not achieved Install spacer 19 over torsion bar and pin assembly 20 and insert the assembly into the spool 22 end Align the cross hole in the torsion bar 20 with the cross hole in the input shaft 16 and insert a 120 diameter pin punch to maintain alignment Insert the needle roller 17 into cross hole in input shaft 16 and while retracting the pin punch engage the pin in the torsion bar 20 cross hole Initiate press of needle roller 17 into torsion bar 20 with a few light impacts Press needle roller flush with outside diameter of input shaft 16 using a 1 2 drive socket of 11 16 size for supporting the input sha
3. maximum O D or a 7 8 deep well socket may be EE ai i used to push these parts into place Figure HGA 27 30 Assemble retaining ring 3 into upper cover 7 groove Be sure rounded edge of retaining ring is faced inward Assemble new dirt seal 2 into upper cover 7 24 Apply a small amount of clean grease to washer 37 and install over pin in end cover assembly 38 Grease should hold washer 37 to end cover 3 mk assembly counterbore 25 Assemble end cover assembly 38 with washer 32 Note If the HGA unit is to be stored plug the 37 attached over assembly posts and onto HGA cylinder ports and fill the inlet port with clean oil unit Rotate input shaft until oil appears at outlet port 26 Install five of the special bolts 39 finger tight 33 Plug the port holes to prevent entrance of dirt This Remove two assembly posts and assemble the completes assembly of the HGA unit other two special bolts per steps 1 and 2 as follows and do not over torque as it will cause unrepairable damage 1 Torque all seven special bolts to 2 3 ft Ibs in sequence as shown in Figure HGA 28 22 Parker Hannifin Corporation i Hydraulic Pump Motor Division Hyd raulics Greeneville Tennessee Bulletin 2751 001 M1 USA Service Manual HGA Column HGA Hydraguide 475109A1 Jacket Tube Clamp 403813 Coupling 401362 Retaining Ring Spring 040050 Dowel Pin 089142 Input Shaft APA ON EE TO DISASSEMBLE COLUMN
4. Darker Hydraulics Service Manual HGA Hydraguide Note The rotor set 31 requires special attention in handling to avoid nicks and scratching It is recommended that the rotor 31B stator 31A vanes 31D and springs 31C be checked in the assembled condition To inspect the rotor set place the assembly face down on the lapped face of the end cover 38 and check for freedom of rotor rotation within the stator The action of the spring loaded vanes may be observed during rotation The vanes should move freely in their slots without bind due to the forces of the springs See Figure HGA 15 Figure HGA 15 Using a feeler gage check the rotor 31B to the stator 31A clearance as shown in figure HGA 16 If there is more than a 007 inch clearance the rotor set 31 must be replaced Note This applies to rotor sets with and without vanes Figure HGA 16 Carefully lift the rotor set assembly 31 from the end cover 38 and measure the thickness of the rotor 31B and stator 81A Thickness difference between the rotor and stator shall not exceed 003 inch The internal splines in the rotor should not allow abnormal wear or damage Parker Hannifin Corporation Hydraulic Pump Motor Division Greeneville Tennessee Bulletin 2751 001 M1 USA Assembly Procedure IMPORTANT Before starting assembly clean all parts with clean petroleum base solvent and air dry Do not wipe dry with rags Be sure all dried p
5. 1 Remove steering wheel and wheel nut 8 2 Loosen clamp assembly 1 on upper cover of HGA unit If the system has a column support clamp this clamp should be loosened at this time 3 If there is a horn contact assembly on the column remove the 4 small screws from the metal cover if applicable and remove the metal cover and gasket Remove the 2 small screws from the horn contact assembly 4 Pull the jacket tube 6 and bearing assembly 7 off of the wheel tube 5 5 Remove the retaining springs 3 and discard 6 Lightly tap out the pins 4 with brass rods and hammer Do not hit the pins with heavy hammer blows as this may damage the HGA unit 7 Remove the wheel tube 5 8 Remove the coupling 2 9 Remove the clamp assembly 1 23 Darker Hydraulics 6 096245 Jacket Tube Chart 7 063980 Bushing 8 026045 Wheel Nut 6 amp 7 096245A1 Jacket Tube TO ASSEMBLE COLUMN 1 Assemble the clamp assembly 1 onto the HGA unit Do not tighten 2 Assemble the coupling 2 and align pin hole 3 Assemble one of the pins 4 and one of the new retaining rings 3 4 Assemble the wheel tube 5 and align pin hole 5 Assemble the other pin 4 and retaining ring 8 6 Apply a small amount of clean grease to the inside of bearing assembly 7 7 Assemble the jacket tube 6 and bearing assem bly 7 over the wheel tube through the clamp assembly 1 and onto the HGA unit upper cover
6. Hydraulics Bulletin 2751 001 M1 USA Hydraguide Service Procedure Effective July 1 2000 HGA Series Hydrostatic Steering System N WARNING FAILURE OR IMPROPER SELECTION OR IMPROPER USE OF THE PRODUCTS AND OR SYSTEMS DESCRIBED HEREIN OR RELATED ITEMS CAN CAUSE DEATH PERSONAL INJURY AND PROPERTY DAMAGE This document and other information from Parker Hannifin Corporation its subsidiaries and authorized distributors provide product and or system options for further investigation by users having technical expertise It is important that you analyze all aspects of your application and review the information concerning the product or system in the current product catalog Due to the variety of operating conditions and applications for these products or systems the user through its own analysis and testing is solely responsible for making the final selection of the products and systems and assuring that all performance safety and warning requirements of the application are met The products described herein including without limitation product features specifications designs availability and pricing are subject to change by Parker Hannifin Corporation and its subsidiaries at any time without notice Offer of Sale The items described in this document are hereby offered for sale by Parker Hannifin Corporation its subsidiaries or its authorized distributors This offer and its acceptance are governed by the provisions stated in
7. Offer of Sale The items described in this document and other documents or descriptions provided by Parker Hannifin Corporation its subsidiaries and its authorized distributors are hereby offered for sale at prices to be established by Parker Hannifin Corporation its subsidiaries and its authorized distributors This offer and its acceptance by any customer Buyer shall be governed by all of the following Terms and Conditions Buyer s order for any such items when communicated to Parker Hannifin Corporation its subsidiary or an authorized distributor Seller verbally or in writing shall constitute acceptance of this offer 1 Terms and Conditions of Sale All descriptions quotations propos als offers acknowledgments acceptances and sales of Seller s prod ucts are subject to and shall be governed exclusively by the terms and conditions stated herein Buyers acceptance of any offer to sell is limited to these terms and conditions Any terms or conditions in addition to or inconsistent with those stated herein proposed by Buyer in any acceptance of an offer by Seller are hereby objected to No such additional different or inconsistent terms and conditions shall become part of the contract between Buyer and Seller unless expressly ac cepted in writing by Seller Seller s acceptance of any offer to purchase by Buyer is expressly conditional upon Buyer s assent to all the terms and conditions stated herein including any terms
8. Typical Oil Flow HGA Hydraguide c SI hi ig WHEEL IM wise edd e Dk STEER L4 pr E SPOL mmm STEERING WHEEL INPUT Caunber Clockwise Rotation Left Hand Turn SUPPLY PRESSURE From Power Pump ES 1 RETURN OIL FLOW To Reservoir F4 METERED OIL FLOW To Cylinder 4 Parker Hannifin Corporation i Hydraulic Pump Motor Division Hyd raulics Greeneville Tennessee Bulletin 2751 001 M1 USA Service Manual Typical Oil Flow HGA Hydraguide p res Pre gt F E STEERPWG WHEEL IMPLIT Courier Ciochywise Botzaks Left Hand Turn BE OIL FLOW From Recirculating Valve RETURN OIL To Recirculating Valve J METERED OIL FLOW To Cylinder 5 Parker Hannifin Corporation i Hydraulic Pump Motor Division Hyd raulics Greeneville Tennessee Bulletin 2751 001 M1 USA Service Manual Hydraguide Steering HGA Hydraguide MODEL HGA Hydraguide is the name given to hydrostatic steering systems In the HGA type Hydraguide steering system an engine driven pump relief valve cylinder reservoir filter fluid lines and an HGA control unit are needed An automotive type steering wheel is attached to the HGA unit and the cylinder is connected by suitable means to the steered wheels The driver has power steering control at all times so long as system components work together system integrity is maintained and adequate fluid is present I
9. gt lt 401413 0 154 5 00 5 62 I 401432 0 147 6 00 6 50 lt 401435 0 139 5 00 5 62 e 401627 0 139 6 00 ec Co o O E Bulletin 2751 001 M1 USA Service Procedure SERVICE PROCEDURE For service information on the steering pump engine driven and power cylinder see information provided by the manufacturer of these units For servicing the HGA unit and the system see instructions in the following sections Servicing of HGA Unit Page 14 Filling and Air Bleeding the System When Drained of Oil Page 24 Hydraulic Fluid Page 24 Service Manual HGA Hydraguide CLEAN WORK CONDITIONS It is a must that the system be kept free of dirt or foreign matter in the oil circuit Cleanliness in servicing this power steering system is absolutely necessary If it is necessary to disassemble any of the units make sure that a clean work bench or table is used A piece of clean wrapping paper makes an excellent dispos able top Outside dirt should be cleaned off before disconnect ing lines and port holes should be plugged immedi ately after disconnecting lines Finish cleaning off outside dirt before placing on work bench When disassembled parts should be cleaned only in clear clean petroleum base solvent and blown dry with clean dry air Other solvents may cause deterioration of rubber seals Avoid wiping parts with cloth and never steam clean hydraulic steering assemblies WARNING SINCE SOLVENTS ARE FLAMMABLE
10. 12 Figure HGA 10 10 Reverse the HGA unit in the vise to place the input shaft 16 in a vertical position Using a center 19 Remove the torsion bar 20 and spacer 19 by punch mark the upper cover flange 7 in relation inverting the spool assembly and allowing the to a similar mark placed on the port face of the parts to fall free Do not remove needle roller 21 housing 25 to facilitate reassembly See figure from torsion bar See Figure HGA 13 HGA 11 Figure HGA 11 4 mk Remove the four special cap screws 6 by using a e 5 16 12 point socket Figure HGA 12 12 Grasp the input shaft 16 and with a smooth upward motion remove the input shaft 16 upper cover 7 and spool 22 assembly from the housing 25 Note Avoid applying side forces to the spool which would cause binding of the closely fitted assembly Never use excessive force to remove the spool from the housing 13 Remove and discard seal 8 14 Remove the upper cover 7 with shaft seal pack age Items 2 thru 5 intact Remove spacer item 15 15 Remove shims 9 from either upper cover 7 cavity or from face of thrust washer 11 Count and record the number of shims to aid in reassem bly of unit Figure HGA 13 16 Parker Hannifin Corporation i Hydraulic Pump Motor Division Hyd raulics Greeneville Tennessee Bulletin 2751 001 M1 USA Service Manual Disassembly Procedure HGA Hydraguide 20 Remove the drive
11. HGA valve spool actuation oil must be added to the reservoir to replenish the oil moving into the circuit Keep rotating the steering wheel to keep the HGA valve spool actuated Do this until the road wheels have reached the stop in that direction then quickly reverse the steering wheel rotation to actuate the HGA valve spool in the opposite direction Keep rotating the steering wheel left and right from stop to stop of the road wheels to bleed out air Replenish oil as necessary The air will bleed out only at the reservoir there fore the oil must be circulated in both directions repeatedly until the air has bled out NOTE The oil in the lines to the power cylinder reaches a dead end at the piston The oil in the cylinder does not flow in a circuit As the piston moves back and forth the oil moves back and forth in the lines Therefore air in these lines and the cylinder may be slow moving into the HGA control valve and to the reservoir CAUTION Do not operate vehicle until air is bled out When the oil in the reservoir is clear not cloudy or creamy the system is free of air Slight creep or drift of the steering wheel is normal Adjust the oil to recommended level in reservoir and assemble reservoir cover 10 Always fill reservoir to recommended level 24 Darker Hydraulics Keep the steering system filled with one of the following Automatic Transmission Fluid Type F Aut
12. a ball check valve in a channel connecting the return flow chamber to the engine driven pump pressure inlet chamber The recirculation valve is closed during power operation WARNING ALL STEERING MECHANISMS ARE LIFE AND LIMB ITEMS AS SUCH IT IS IMPERATIVE THAT THE INSTRUCTIONS IN THIS BOOKLET ARE FOLLOWED TO THE LETTER FAILURE TO OB SERVE THE PROCEDURES SET OUT IN THIS PAMPHLET MAY RESULT IN LOSS OF STEERING Darker Hydraulics 9 Parker Hannifin Corporation Hydraulic Pump Motor Division Greeneville Tennessee soles pAH OL oessouue dI IAQUBAID UOISIAIG 4010JN duind IINEIP H uone1od109 uyIUUEH 19418 d o AO OTE Ball 32 Manifold O Ring 33 Commutator Ring Plug 34 Commutator Spacer 35 Seal Retainer Drive Link 36 Seal Rotor Set 37 Washer 31 a Stator 38 End Cover 31 b Rotor 39 Special Bolt 31 c Spring 31 d Vane Vanes are specified on HGA units with rotor widths smaller than 1 00 Nut Thrust Washer Dirt 8 Water Seal 12 Thrust Bearing Retaining Ring 13 Thrust Washer 21 Needle Roller Backup Washer 14 Spring Washer 22 Spool Seal 15 Spacer 23 Ball Screw 16 Input Shaft 24 Spring Upper Cover 17 Needle Roller 25 Housing Assembly Seal 18 Drive Ring 25 a Plug Shim 19 Spacer 25 b O Ring Retaining Ring 20 Torsion Bar 25 c Ball Items 2 4 5 included in HG500007 Kit Figure HGA 6 ltems sold in matched sets only M8IA pa
13. of Seller s obligations by reason of circumstances beyond the reasonable control of Seller hereinafter Events of Force Majeure Events of Force Majeure shall include without limitation accidents acts of God strikes or labor disputes acts laws rules or regulations of any government or government agency fires floods delays or failures in delivery of carriers or suppliers shortages of materials and any other cause beyond Seller s control 12 Entire Agreement Governing Law The terms and conditions set forth herein together with any amendments modifications and any different terms or conditions expressly accepted by Seller in writing shall constitute the entire Agreement concerning the items sold and there are no oral or other representations or agreements which pertain thereto This Agreement shall be governed in all respects by the law of the State of Ohio No actions arising out of the sale of the items sold hereunder or this Agreement may be brought by either party more than two 2 years after the cause of action accrues 9 91 P Darker Hydraulics Parker Hannifin Corporation Hydraulic Pump Motor Division Greeneville Tennessee Hydraulics Parker Hannifin Corporation 2745 Snapps Ferry Road Greeneville TN 37745 USA Tel 423 639 8151 FAX 423 787 2418 Web site http www parker com HGA 8 2000
14. rotor and channels the fluid to and from the valve section and to and from the rotor set METERING ELEMENT fluid cavity convex configuration Figure HGA 3 8 Parker Hannifin Corporation i Hydraulic Pump Motor Division Hyd raulics Greeneville Tennessee Bulletin 2751 001 M1 USA Hydraguide Steering POWER STEERING OPERATION When the spool is in center or neutral position the hydraulic oil from the engine driven pump circulates through the valve section directly back to the reservoir with sufficient pressure only to overcome friction of valve channels and lines There is no circulation of engine driven pump oil to or from the cylinder Note the center diagram showing neutral position See diagram on inside front cover on which no directional arrows appear in the metering channels The oil pressure at the two cylinder ports is equal and pro duces ineffective forces in the cylinder In order to accomplish a power steering maneuver the operator must rotate the steering wheel in the direc tion of the steering maneuver The initial rotation of the steering wheel rotates the input shaft which tends to rotate the drive link and rotor set through the torsion bar centering spring Rotation of the rotor set and spool which are coupled by the drive link is resisted by the cylinder pressure required to overcome the steering forces As the input shaft is rotated relative to the spool the centering spring is torsionally deflected
15. the Offer of Sale Copyright 2000 Parker Hannifin Corporation All Rights Reserved 2 Parker Hannifin Corporation Hydraulic Pump Motor Division Hyd raulics Greeneville Tennessee Bulletin 2751 001 M1 USA Service Manual Table of Contents HGA Hydraguide TYPICAL ON A oN e E EE E E dai HR YN NR 4 Hydraguide Steering ModelHGA PENES 6 SYSTEM ODeratlOn iii lit data 7 Desigh and FUNCION cai estes Hates Hato uet eiu n ue esee ione 7 Control ValV n ui eth bt i e s cold hr el e Er ee e hee re bet e ere Pe cons e re one 8 Metering Section eni e eine mo fae teu eti atenta d ive eate ftt inen Nm thes 8 te te mi OPS ALON DVD 8 Power Steering Operation ccccceececeeeccceeeeeeeeeeeeeeeeecaaeeseeaeeeeceaaeeeeeaeeeegaaeeeseaaaeseeeeseseaaeeecaaeseenaeeseeeeeeeseaaeeees 9 Manual Steering Operation sise 9 gie e RE 10 Service PAUSA YO HD ADD a cee eee 11 DEVICE POCO UE E 13 Work amp 1e glo e si cra epe oe EN NOA ed 13 Seal Replacement Instructions sisi 14 Servicing of HGA WEE 14 Disassembly dee 15 Inspection and Replacement sise 18 Assembly Procedures ii is 19 HGA COUA ii 23 Oil amp Hydraulic Fluid Filling and Air Bleeding System iii 24 Lake IIe FU EE 24 Tips for Maintaining the System sise 25 uideri r EM 26 3 Parker Hannifin Corporation i Hydraulic Pump Motor Division Hyd raulics Greeneville Tennessee Bulletin 2751 001 M1 USA Service Manual
16. Axial shift of the spool is induced by the ball which is captive in the spool and engaged in the helical groove provided in the input shaft When the spool is axially displaced within the body fluid channels are selected connecting the engine driven pump to the intake side of the rotor set via the Service Manual HGA Hydraguide commutator The exhaust side of the rotor set is connected through the commutator to one side of the cylinder while the other side of the cylinder is con nected to the reservoir See Figures HGA 1 and 2 Further axial displacement of the spool results in increased system pressure to provide the level of pressure required A portion or all of the hydraulic fluid at the required pressure from the engine driven pump depending upon the speed of steering is directed to the cylinder via the metering section using cylinder movement to accomplish the steering maneuver MANUAL STEERING OPERATION In the absence of system pressure the driver s manual effort displaces the spool axially When the spool is displaced within the body fluid channels are selected connecting the rotor set which is now acting as a pump via the commutator to one side of the cylinder The return flow from the other side of the cylinder is channeled through a recirculation valve so that the oil will flow to the intake side of the rotor set via the commutator instead of back to the reservoir See Figure HGA 5 The recirculation valve is
17. BE EXTREMELY CAREFUL WHEN USING THEM EVEN A SMALL EXPLOSION OR FIRE COULD CAUSE DEATH OR INJURY WARNING EYE PROTECTION SHOULD BE WORN WARNING OSHA MAXIMUM AIR PRESSURE REQUIREMENTS SHOULD BE COMPLIED WITH TO PREVENT INJURY Darker Hydraulics Parker Hannifin Corporation Hydraulic Pump Motor Division Greeneville Tennessee Bulletin 2751 001 M1 USA Service Manual Service Procedure HGA Hydraguide SEAL REPLACEMENT INSTRUCTIONS For numerous installation you may want to purchase the J26910 tool kit available from KENT MOORE TOOL DIVISION 29784 Little Mack Roseville Michigan 48066 Phone 800 345 2233 Caution Follow the instructions and do not disassemble the Hydraguide unit upper cover 7 to replace the shaft seal 5 1 Remove the steering wheel nut 1 steering wheel 6 Cover the end of the Hydraguide unit input shaft and steering wheel column if applicable Refer to with cellophane tape to protect the new seal 5 page 18 for instructions on removal of steering when it is assembled over the sharp edges of the wheel column input shaft 2 Remove the dirt seal 2 over the end of the 7 Lubricate the new seal using hydraulic oil and Hydraguide unit upper cover if applicable Discard install the new seal 5 with lip side first onto the this part Hydraguide unit input shaft 3 Remove the retaining ring 3 do not discard this 8 Remove the cellophane tape from the Hydraguide part must be reinstalled during
18. Now tighten screws to 18 22 ft lbs torque See Figure HGA 20 4 a d Figure HGA 20 Darker Hydraulics Service Manual HGA Hydraguide NOTE If any of the input shaft 16 housing and spool torsion bar or upper cover 7 have been replaced the following procedure for checking and shim adjustment must be used 16b Re assemble as in a above using the required new parts After torquing the four screws 6 revolve unit in vise so that the input shaft is pointing downward In order to determine that the unit is shimmed correctly the drive link 30 must be in its proper position To do this grasp the input shaft 16 pull downward and prevent rotation Engage drive link splines in spool 22 and rotate to position spool essentially flush with end of housing 25 Remove drive link and orient drive link slot to engage torsion bar needle roller 21 and insert drive link Observe relationship of spool end to body The valve spool must protrude 020 0025 from the adjacent counterbore surface If within spec no additional shimming required If not within 0025 add or remove shims 9 until this requirement is satisfied repeating assembling steps as outlined in a above See Figure HGA 21 Figure HGA 21 16c The correct shimming must be checked on the vehicle or on a Suitable hydraulic test stand The amount of steering effort required to steer the vehicle when the vehicle is at rest on dry paveme
19. RSE OF DEALING ARE HEREBY DISCLAIMED NOTWITHSTANDING THE FOREGOING THERE ARE NO WARRANTIES WHATSOEVER ON ITEMS BUILT OR ACQUIRED WHOLLY OR PARTIALLY TO BUYER S DESIGNS OR SPECIFICA TIONS 5 Limitation Of Remedy SELLER S LIABILITY ARISING FROM OR IN ANY WAY CONNECTED WITH THE ITEMS SOLD OR THIS CON TRACT SHALL BE LIMITED EXCLUSIVELY TO REPAIR OR RE PLACEMENT OF THE ITEMS SOLD OR REFUND OF THE PUR CHASE PRICE PAID BY BUYER AT SELLER S SOLE OPTION INNO EVENT SHALL SELLER BE LIABLE FOR ANY INCIDENTAL CON SEQUENTIAL OR SPECIAL DAMAGES OF ANY KIND OR NATURE WHATSOEVER INCLUDING BUT NOT LIMITED TO LOST PROFITS ARISING FROM OR IN ANY WAY CONNECTED WITH THIS AGREE MENT OR ITEMS SOLD HEREUNDER WHETHER ALLEGED TO ARISE FROM BREACH OF CONTRACT EXPRESS OR IMPLIED WARRANTY OR IN TORT INCLUDING WITHOUT LIMITATION NEGLIGENCE FAILURE TO WARN OR STRICT LIABILITY 6 Changes Reschedules and Cancellations Buyer may request to modify the designs or specifications for the items sold hereunder as well as the quantities and delivery dates thereof or may request to cancel all or part of this order however no such requested modification or cancellation shall become part of the contract between Buyer and Seller unless accepted by Seller in a written amendment to this Agreement Acceptance of any such requested modification or cancellation shall be at Seller s discretion and shall be upon such terms and conditions as Seller may require 7 S
20. acer yT Set Retainer Retainer Boot Seal Boot Seal Bolts 7 ea 5 S Before Date After Date 77 E Code195 94 Code195 94 E HGA 08 506607 HGA087010 501 099070 1 522 032626 1 648 021269 021428 BASE A10506 HGA013008 4772480184 2 D HGA 10 506606 HGA107010 626 099071 1 647 032618 1 786 021280 021356 BASE A10525 HGA013008 4772480196 HGA 12 506611 HGA127007 751 099072 1 772 032619 1 923 021283 021311 BASE A10538 HGA013008 4772480209 HGA 14 506610 HGA147005 876 099073 1 897 032627 2 066 021290 021306 BASE A10550 HGA013008 4772480221 HGA 16 506609 HGA167005 1 001 099074 2 022 032628 2 203 021292 021382 BASE A10562 HGA013008 4772480234 HGA 20 HGA207005 1 252 099075 2 272 032620 2 511 021294 021357 BASE A10525 HGA013005 4772480196 HGA 24 HGA247005 1 502 099076 2 522 032629 2 753 021295 021444 BASE A10550 HGA013005 4772480221 HGA 28 HGA287005 1 752 099077 2 772 032621 3 026 021296 021358 BASE A10538 HGA013006 4772480209 HGA 32 HGA327004 2 002 099095 3 022 032759 3 313 021349 021435 BASE A10562 HGA013006 4772480234 Use part number 020206 on assemblies manufactured prior to date code 195 94 Torsion bars are unit specific To select the correct replacement measure the diameter of the center section of the bar and the length between holes then select the correct base number from the following chart Base Number Bar Center Diameter in Length Between Holes in 401360 0 147 5 00 5 62 401363 0 160 6 00 6 50 o qu 401368 0 160 5 00 5 62
21. aint chips have been removed from edges of lapped surfaces Unless otherwise indicated DO NOT oil parts before assembly 1 Insert ball 26 into its cavity in the housing 2 Install new o ring 27 on plug and roll pin assem bly 28 and install in the housing 25 to 10 14 ft lbs torque Reclamp housing 25 in the vise as shown in Figure HGA 11 Assemble thrust washer 13 thrust bearing 12 thrust washer 11 and retaining ring 10 on input shaft 16 If the retaining spring 24 has been removed install a new retaining spring The spring must fit tightly Insert actuator ball 23 into ball seat located inside spool 22 Assemble wave spring washer 14 over thrust washer 13 and thrust bearing 12 Insert the input shaft 16 into the spool engaging the helix and ball with a counter clockwise motion This operation is best done while holding the spool in a horizontal position Using the mid section of the torsion bar 20 as a gage insert the gage between the spool end and the thrust washer 13 See Figure HGA 17 This will position the spool in the necessary radial relationship with the input shaft spline teeth for assembly of drive ring 18 Place the input shaft 16 and spool 22 assembly in a vertical position with the shaft end on the table surface Figure HGA 17 19 Darker Hydraulics Service Manual HGA Hydraguide NOTE SPOOL SHORTENED FOR BETTER ILLUSTRATION
22. assembly procedure unit input shaft 4 Remove the seal package parts 4 5 from the 9 Assemble the new washer 4 with small end first Hydraguide unit by one of the following methods onto the Hydraguide unit input shaft and push the a If the Hydraguide unit has not been removed new washer and the new seal 5 previously from the vehicle rotate the Hydraguide unit installed down into the Hydraguide unit upper input shaft either clockwise or counter clockwise cover A short piece of metal tubing 15 16 mini to pressurize the system and force the seal mum I D x 1 3 16 maximum O D or a 7 8 deep package out Discard these parts well socket may be used to push these parts into b If the Hydraguide unit has been removed from piece 17 the vehicle plug three of the four ports in the 10 Assemble the previously used retaining ring 3 Hydraguide unit and pressurize the other port onto the Hydraguide unit input shaft and down into with air pressure to force the seal package out the Hydraguide unit upper cover groove Be sure Discard these parts the rounded edge of the retaining ring 3 is faced 5 Note Clean the Hydraguide unit input shaft 16 nwar i and upper cover 7 seal bore to remove particles 11 Assemble the new seal 2 onto the Hydraguide of dirt felt lint etc with a clean lint free rag unit input shaft and down into the Hydraguide unit Caution excessive particles of felt or lint can cause upper cover 7 counter bore the n
23. ce those parts which are not in good condition The following finished surfaces should be inspected for abnormal wear scoring or damage 1 Housing 25 bore and ends 2 Valve spool 22 outside diameter Some burnish ing due to use may be observed 3 Valve spool 22 control edges 4 Valve spool 22 splines 5 Input shaft 16 seal area Check for rust pitting and excessive wear Light circumferential polishing due to seal contact may be observed 6 Input shaft 16 helical groove Note the contact pattern created by the actuator ball 23 Surface should be free from pits chipping or surface break down 7 Thrust bearing 12 and thrust washers 11 and 13 Inspect for pitting of rolls and faces of thrust washers 8 Drive link 80 pin slot Width of slot must not exceed 001 inch difference at any point in its length 9 Drive link 30 teeth 10 Torsion bar and needle roller assembly 20 Difference in diameter of needle roller 21 should not exceed 001 The following parts may show a polish pattern due to the rotor action and the circular motion of the commu tator The sides of these components are ground and lapped and should be free from nicks burrs and scoring 1 Spacer 29 2 Manifold 32 3 Rotor 31 4 Commutator 34 and Commutator Ring 33 Note Thickness difference between commuta tor and commutator ring 33 shall not exceed 002 inch 5 End cover and pin assembly 38
24. e driven pump for power steering Emergency manual operation is also described Satisfactory performance of this system requires a well engineered installation designed for the particular type of vehicle and the type and kind of service for which it will be used Parker Engineering advice and assistance is available and we welcome requests Information on the required engine driven pump capacity and the power cylinder size and connecting lines are provided through engineering contacts A balanced cylinder design is preferred HGA STEERING UNIT SUPPLY PUMP Figure HGA 1 DESIGN 8 FUNCTION The HGA unit consists of a fluid control valve section and a fluid metering section which are hydraulically and mechanically inter connected 7 Parker Hannifin Corporation i Hydraulic Pump Motor Division Hyd raulics Greeneville Tennessee Bulletin 2751 001 M1 USA Service Manual Hydraguide Steering HGA Hydraguide CONTROL VALVE The control valve section contains a mechanically actuated linear spool which is torsion bar centered The function of the control valve section is to direct fluid to and from the metering section and the cylinder and to regulate the pressure supplied to the cylinder The valve is provided with unique pressure chambers which insure effective circuit isolation METERING SECTION The metering section consists of a commutator and bi directional gerotor element which contains an orbiting rotor a
25. ense of any allegations or actions including all negotiations for settlement or compromise If an item sold hereunder is subject to a claim that it infringes the Intellectual Property Rights of a third party Seller may at its sole expense and option procure for Buyer the right to continue using said item replace or modify said item so as to make it noninfringing or offer to accept return of said item and return the purchase price less a reasonable allowance for depreciation Notwithstanding the foregoing Seller shall have no liability for claims of infringement based on information provided by Buyer or directed to items delivered hereunder for which the designs are specified in whole or part by Buyer or infringements resulting from the modification combination or use in a system of any item sold hereunder The foregoing provisions of this Part 10 shall constitute Seller s sole and exclusive liability and Buyers sole and exclusive remedy for infringe ment of Intellectual Property Rights If a claim is based on information provided by Buyer or if the design for an item delivered hereunder is specified in whole or in part by Buyer Buyer shall defend and indemnify Seller for all costs expenses or judgments resulting from any claim that such item infringes any patent trademark copyright trade dress trade secret or any similar right 11 Force Majeure Seller does not assume the risk of and shall not be liable for delay or failure to perform any
26. ew seal package to leak 12 Assemble the steering column if applicable 13 Assemble the steering wheel and wheel nut torque the wheel nut to 35 ft Ibs SERVICING OF HGA UNIT Refer to exploded view Figure HGA 6 for parts identification The spool 22 and the housing 25 the commutator 34 and commutator ring 33 as well as the rotor 31B and the stator 31A are not separately replaceable because they are selectively fitted at the factory If the spool or housing need replacement the complete housing assembly must be replaced If the commutator or the commutator ring need replacement both must be replaced as a matched set If the rotor or stator need replace ment the complete rotor set 31 must be replaced The pin in the end cover is not separately replaceable If the pin or end cover need replacement the end cover and pin assembly 38 must be replaced 14 Parker Hannifin Corporation i Hydraulic Pump Motor Division Hyd raulics Greeneville Tennessee Bulletin 2751 001 M1 USA Disassembly Procedure Plug the four port holes and clean the exterior of the unit thoroughly Then remove the plugs 1 To prevent possible distortion or damage to unit if placed directly in vise the following procedure should be used Insert o ring tube fitting with tube nut or fitting cap attached into one of the four threaded ports in the housing Clamp the fitting in a vise in a manner which will locate the seven end cover bolts i
27. f there is a failure in the high pressure circuit a loss of power steering will result The HGA however is designed to have some manual steering capability depending on the installation If you can t manually steer the vehicle without using extraordinary measures such as leaving your seat or pushing with your legs don t try it Repair the failure in the power circuit Some vehicles may be impos sible to steer manually because of their weight and size WARNING EXTRAORDINARY MEASURES SHOULD NOT BE USED IN ATTEMPTING TO MANUALLY STEER THE VEHICLE AS THEY MAY GENERATE FORCES IN EXCESS OF 125 FT LBS THEREBY DAMAGING THE UNIT INTERNALLY WHICH COULD RESULT INA COMPLETE LOSS OF STEERING WARNING ALL STEERING MECHANISMS ARE LIFE AND LIMB ITEMS AS SUCH IT IS IMPERATIVE THAT THE INSTRUCTIONS IN THIS BOOKLET ARE FOLLOWED TO THE LETTER FAILURE TO OB SERVE THE PROCEDURES SET OUT IN THIS PAMPHLET MAY RESULT IN LOSS OF STEERING 6 Parker Hannifin Corporation j Hydraulic Pump Motor Division Hyd raulics Greeneville Tennessee Bulletin 2751 001 M1 USA Service Manual Hydraguide Steering HGA Hydraguide SYSTEM OPERATION This literature with the illustrations shown covers the basic design of the HGA unit Variations may be engineered to suit special requirements The description of the operation of the HGA unit and the illustrations explain the functioning of the system for the utilization of the hydraulic power generated by the engin
28. ft See Figure HGA 19 With a few light impacts on a 120 diameter pin punch drive needle roller 17 approximately 1 32 below the input shaft 16 O D See Figure HGA 12 Parker Hannifin Corporation Hydraulic Pump Motor Division Greeneville Tennessee Bulletin 2751 001 M1 USA Assembly Procedure Figure HGA 19 15 Assemble spacer 15 over valve spool 22 against spring washer 14 If so constructed the inside lip end of spacer must be toward the spring washer Place assembly spool end first into housing 25 Caution Avoid applying side forces to the spool which would cause binding of the closely fitted assembly Note If neither the input shaft 16 or upper cover 7 are replaced the original shims 9 may be reused However if in the inspection of parts damage is found to the shims discard these shims and replace with new parts of equal thickness 16a Place shims on top of the thrust washer 11 Coat seal 8 with clean grease and place in upper cover 7 counterbore Assemble upper cover onto input shaft 16 and rotate to align punch marks previously made during disassembly Note If a new upper cover is used no angular orientation is required However it is necessary to align the upper cover 7 and housing 25 Replace with screws finger tight and then use a pilot ring or a worm drive type hose clamp tightened around the upper cover flange and the body pilot diameter to achieve the required alignment
29. in addition to or inconsistent with those contained in Buyer s offer Acceptance of Seller s products shall in all events constitute such assent 2 Payment Payment shall be made by Buyer net 30 days from the date of delivery of the items purchased hereunder Amounts not timely paid shall bear interest at the maximum rate permitted by law for each month or portion thereof that the Buyer is late in making payment Any claims by Buyer for omissions or shortages in a shipment shall be waived unless Seller receives notice thereof within 30 days after Buyer s receipt of the shipment 3 Delivery Unless otherwise provided on the face hereof delivery shall be made F O B Sellers plant Regardless of the method of delivery however risk of loss shall pass to Buyer upon Seller s delivery to a carrier Any delivery dates shown are approximate only and Seller shall have no liability for any delays in delivery 4 Warranty Seller warrants that the items sold hereunder shall be free from defects in material or workmanship for a period of 18 months from date of shipment from Parker Hannifin Corporation THIS WARRANTY COMPRISES THE SOLE AND ENTIRE WARRANTY PERTAINING TO ITEMS PROVIDED HEREUNDER SELLER MAKES NO OTHER WAR RANTY GUARANTEE OR REPRESENTATION OF ANY KIND WHAT SOEVER ALL OTHER WARRANTIES INCLUDING BUT NOT LIM ITED TO MERCHANTABILITY AND FITNESS FOR PURPOSE WHETHER EXPRESS IMPLIED OR ARISING BY OPERATION OF LAW TRADE USAGE OR COU
30. liding and lifting motion See Figure HGA 9 Figure HGA 9 Separate drive link 30 by sliding the rotor set 31 on the spacer 29 allowing the drive link teeth to clear the spacer hole Remove drive link and separate rotor set from spacer Use extreme caution to keep vanes 31D and springs 31C from falling out When handling the rotor set pressure should be applied to the rotor 31B by gripping the rotor set between the fingers and urging the rotor into contact with the stator 31A See Figure HGA 10 Carefully protect against damage to side faces Note The rotor 31B and the stator 31A must be kept in a matched set Parker Hannifin Corporation Hydraulic Pump Motor Division Greeneville Tennessee Bulletin 2751 001 M1 USA Service Manual Disassembly Procedure HGA Hydraguide 16 Remove seal 2 retaining ring 3 using proper snap ring pliers Discard seal 2 Remove and discard backup washer 4 Remove and discard seal 5 17 Remove the retaining ring 10 thrust washer 11 thrust bearing 12 thrust washer 13 and spring washer 14 from input shaft 16 Note Retaining ring is twisted design Do not straighten ring 18 Remove the needle roller 17 by using a pin punch of 125 inch max diameter for a minimum of 625 length The input shaft 16 should be placed on a block of wood to avoid shaft damage and the needle roller 21 removed by impact using light hammer blows See Figure HGA
31. n an upright position See Figure HGA 7 Figure HGA 7 2 Unscrew the seven special bolts 39 from the end cover 38 Note Special care should be used in the following steps to insure protection of the ground and lapped faces of the components Avoid scratching or nicking of finished sur faces 3 Remove end cover 38 by bumping it sideways with a soft hammer to loosen it from the rotor seal 36 and seal retainer 35 and lift from unit Caution The washer 37 and commutator 34 may adhere to the end cover and may be removed with the end cover Do not attempt to remove pin because pin is press fit in the plate and is non serviceable See Figure HGA 8 4 Remove the rotor seal 36 and seal retainer 35 by bumping the can sideways with a soft hammer to loosen it from the housing and lift off the rotor seal and seal retainer Discard the rotor seal 5 If the wear washer 37 and commutator 34 were not removed with the end cover 38 remove these parts from the HGA unit 6 Remove the commutator ring 33 from the mani 15 Darker Hydraulics Service Manual HGA Hydraguide fold 32 by a sliding and lifting motion Care should be used in the handling of this fragile component Remove the manifold 32 from the rotor set 31 by sliding and lifting motion Remove the rotor set 31 spacer 29 and drive link 30 as an assembly by grasping the spacer and removing the assembly with a s
32. nd a fixed stator The commutator rotates at orbit speed with the rotor and channels the fluid to and from the rotor set and the valve section The rotor incorporates unique sealing vanes which are spring and hydraulically forced into sealing contact between the rotor and stator to reduce leakage across the metering section The function of the metering section is to meter the oil to the power cylinder maintaining the relationship between the hand wheel and the steered wheels An additional function of the metering section is to act as a manually operated pump providing manual steering in the event of an inoperative engine driven pump Figure HGA 2 ROTOR OPERATION IN THE ROTOR SET See Fig HGA 3 Each lobe of the rotor has a diametrically opposite lobe therefore when one lobe is in a cavity its opposite lobe is at the crest of the stator s convex form opposite the cavity As the rotor is rotated each lobe in sequence is moved out of its cavity to the crest of the stator s convex form and this forces each opposite lobe in sequence into a cavity Due to the interaction between the rotor and the stator there are 42 fluid discharging actions in one revolution of the rotor When the rotor is moving fluid is always flowing out of three of the cavities while fluid is flowing into three other cavities and one of the cavities is inactive as it changes from one of discharging fluid to one of admitting fluid The commutator rotates with the
33. nt must be equal within three inch pounds For example if twenty one inch pounds is required to steer to the right not less than eighteen or more than twenty four inch pounds should be required to steer to the left If a test stand is available to place a load between cylinder ports in the same manner as on the vehicle a test stand should be used Add shims to increase steering efforts in a left turn subtract shims to increase steering effort in a right turn 17 With the drive link 30 installed as described above assemble two assembly posts into the housing 25 as shown in Figure HGA 22 These assembly posts can be made by simply cutting the heads off of two bolts similar to the special bolts 39 Parker Hannifin Corporation Hydraulic Pump Motor Division Greeneville Tennessee Bulletin 2751 001 M1 USA Assembly Procedure Figure HGA 22 18 Assemble spacer plate 29 over assembly posts and onto housing 25 with plain side up See Figure HGA 23 Figure HGA 23 19 Install rotor set 31 over assembly posts and onto spacer plate 29 Note One of the seven holes in the rotor set may be smaller than the other six holes Position this hole if applicable over one of the assembly posts See Figure HGA 24 Warning All vane springs 31C must be down in their slots with no part of spring protruding out either side of metering element 21 Darker Hydraulics Service Manual HGA Hydraguide Figu
34. omatic Transmission Fluid Dexron II Hydraulic fluid as recommended by the vehicle manufacturer WARNING DO NOT MIX OIL TYPES ANY MIXTURE OR AN UNAPPROVED OIL COULD DETERIORATE THE SEALS ENOUGH FLUID COULD THEN LEAK TO CREATE ALOSS OF POWER STEERING ASSIST DO NOT ALLOW FLUID LEVEL TO GO BELOW FILL LINE ON DIPSTICK BEFORE ADDING NEW FLUID COMPLETELY DRAIN OLD OIL FROM THE SYSTEM IT MAY BE NECESSARY ALSO THAT YOU FLUSH THE SYSTEM WITH CLEAN OIL Parker Hannifin Corporation Hydraulic Pump Motor Division Greeneville Tennessee Bulletin 2751 001 M1 USA Service Manual Tips HGA Hydraguide TIPS FOR MAINTAINING THE HYDROSTATIC STEERING SYSTEM Top off fluid level in reservoir as necessary Do not attempt to weld any broken steering component Replace the component with original eguipment only Do not cold straighten hot straighten or bend any steering part Maintain correctly inflated tires Always use a puller to remove the steering wheel Do not use a hammer torch or crow bar Investigate and correct immediately any play rattle shimmy or other unusual occurrence in the steering system Prevent dirt or other foreign matter from entering the hydraulic system Clean off around filler caps before checking oil level Investigate and correct any external leak in the steering system no matter how minor the leak Remove cause of steering column misalignment Encourage all drivers or operat
35. ors to report any malfunction or accident that may have damaged a steering system part Comply with manufacturer s specifications for cleaning or replacing the filter WARNINGS for Proper Steering System Operation WARNING DO NOT WELD BRAZE OR SOLDER ANY STEERING SYSTEM COMPONENT WARNING MAXIMUM OPERATING PRESSURE MUST NOT EXCEED VEHICLE MANUFACTURER S RECOMMENDED PUMP PRESSURE CAPACITY WARNING ALWAYS CAREFULLY INSPECT ANY STEERING SYSTEM COMPONENT THAT MAY HAVE BEEN STRUCK OR DAMAGED DURING OPERATION OR IN AN ACCIDENT REPLACE ANY COMPO NENT THAT IS DAMAGED OR THAT IS QUESTIONABLE Parker extends close technical cooperation and assistance If steering problems occur which you cannot solve please contact our Parker Field Service Department Our phone number and address are on the back cover of this manual 25 Parker Hannifin Corporation i Hydraulic Pump Motor Division Hyd raulics Greeneville Tennessee Bulletin 2751 001 M1 USA Service Manual HGA Hydraguide Notes 26 Parker Hannifin Corporation i Hydraulic Pump Motor Division Hyd raulics Greeneville Tennessee Bulletin 2751 001 M1 USA Service Manual HGA Hydraguide Notes 7 Parker Hannifin Corporation i Hydraulic Pump Motor Division Hyd raulics Greeneville Tennessee Bulletin 2751 001 M1 USA Service Manual HGA Hydraguide Notes 28 Parker Hannifin Corporation i Hydraulic Pump Motor Division Hyd raulics Greeneville Tennessee
36. pecial Tooling A tooling charge may be imposed for any special tooling including without limitation dies fixtures molds and patterns acquired to manufacture items sold pursuant to this contract Such special tooling shall be and remain Seller s property notwithstanding payment of any charges by Buyer In no event will Buyer acquire any interest in apparatus belonging to Seller which is utilized in the manu facture of the items sold hereunder even if such apparatus has been specially converted or adapted for such manufacture and notwithstand ing any charges paid by Buyer Unless otherwise agreed Seller shall have the right to alter discard or otherwise dispose of any special tooling or other property in its sole discretion at any time 8 Buyer s Property Any designs tools patterns materials drawings confidential information or equipment furnished by Buyer or any other items which become Buyer s property may be considered obsolete and may be destroyed by Seller after two 2 consecutive years have elapsed without Buyer placing an order for the items which are manufactured using such property Seller shall not be responsible for any loss or damage to such property while it is in Seller s possession or control 9 Taxes Unless otherwise indicated on the face hereof all prices and charges are exclusive of excise sales use property occupational or like taxes which may be imposed by any taxing authority upon the manufac ture sale o
37. pojdx3 VSN LN 100 16Z lt uang wi9pinDeJip H WOH enuey eoiues USE WITH HGA SERVICE MANUAL EXPLODED VIEW o 22 J 1 2 4 amp 5 3 6 7 8 9 10 11 9g Wheel Seal Snap Screw Upper Seal Shim Snap Thrust y 2 Nut Kit Ring 4 ea Cover Kit Ring Washer Ki S I 026045 HG500007 401233 021434 Fine HGA016005X1 032840X1 033157X2 401367 400100 ES ac kee 3 et e 12 13 14 15 16A 16C 16B 16D 17 18 23 gt o Thrust Thrust Spring Spacer Pinhole Wheel Mount Full Bolt Straight Needle Drive Ball Bearing Washer Bearing Washer Shaft Shaft Groove Spline Roller Ring 5 16 dia 063979 400075 401366 477277 089181 089180 089193 089178 040114 HGA013003 400013 24 25 A amp B 25C amp 26 27 amp 28 29 32 33 amp 34 37 38 Spring Plug amp Ball Plug Spacer Manifold Commutator Washer End Cover O Ring 1 4 dia Assy Assy 401412 036147A1 G453570 415395A2 477235 HGA015001 HGA014000A1 028395 402803A1 22 8 25 Housing amp spool are non serviceable due to select fit If either needs to be replaced the housing assembly must be replaced E S gt lt ER e lt S5 Qc Co o O Orv som D T EES 3 23 SE FE o ue zB 38 soles pAH e eesseuue oji eueeJr UOISIAIG 1010 y duing DINEIP H uone1od109 ujyiuueH 49418 d STANDARD PARTS THAT CHANGE WITH DISPLACEMENT o lt 31C D 31 Length of 35 Length of 36 Length of 39 20 amp 21 30 19 Q Y Series Vane Kit Rotor Set Rotor Seal Seal Rubber Rubber 5 16 24 Thread Torsion Bar Drive Link Sp
38. r delivery of the items sold hereunder If any such taxes must be paid by Seller or if Seller is liable for the collection of such tax the amount thereof shall be in addition to the amounts for the items sold Buyer agrees to pay all such taxes or to reimburse Seller therefore upon receipt of its invoice If Buyer claims exemption from any sales use or other tax imposed by any taxing authority Buyer shall save Seller harmless from and against any such tax together with any interest or penalties thereon which may be assessed if the items are held to be taxable 10 Indemnity For Infringement of Intellectual Property Rights Seller shall have no liability for infringement of any patents trademarks copyrights trade dress trade secrets or similar rights except as provided in this Part 10 Seller will defend and indemnify Buyer against allegations of infringement of U S Patents U S Trademarks copyrights trade dress and trade secrets hereinafter Intellectual Property Rights Seller will defend at its expense and will pay the cost of any settlement or damages awarded in an action brought against Buyer based on an allegation that an item sold pursuant to this contract infringes the Intellectual Property Rights of a third party Seller s obligation to defend and indemnify Buyer is contingent on Buyer notifying Seller within ten 10 days after Buyer becomes aware of such allegations of infringe ment and Seller having sole control over the def
39. re HGA 24 20 Install manifold 32 over assembly posts and onto rotor set 31 make sure circular slot side of manifold is up See Figure HGA 25 Figure HGA 25 21 Install commutator ring 33 over assembly posts and onto manifold 32 make sure slot side is down See Figure HGA 26 22 Install rotor seal 36 and seal retainer 35 over rotor set 31 and down against housing 23 To allow for washer 37 assemble commutator 34 with counterbore up into commutator ring 33 with slotted hole in commutator engaging nose of drive link 30 Align commutator outside diameter concentric with inside diameter of commutator ring See Figure HGA 27 Parker Hannifin Corporation Hydraulic Pump Motor Division Greeneville Tennessee Bulletin 2751 001 M1 USA Service Manual Assembly Procedure HGA Hydraguide 2 Torque all seven special bolts to 15 19 ft Ibs in sequence as shown in Figure HGA 28 Note Rotate input shaft during step 2 to prevent binding Figure HGA 28 27 Relocate HGA unit in a vise with the input shaft up Cover end of input shaft with cellophane tape to protect new seal 5 when it is assembled over sharp edges of input shaft 28 Lubricate and install new seal 5 with lip side first onto input shaft 29 Assemble new washer 4 with small end first onto input shaft and push new washer and new seal down into upper cover 7 A short piece of metal tubing 15 16 minimum I D x 1 3 16
40. ring 18 by placing the end of 21 the spool 22 on a table surface Rotate the input shaft 16 to extremes of travel until the drive ring falls free See Figure HGA 14 Figure HGA 14 17 Darker Hydraulics 22 23 With the spool assembly in the same position as the step above rotate the input shaft 16 ina clockwise direction until the actuator ball 23 disengages from the helical groove in the input shaft Lift out input shaft Caution The actuator ball may fall free and care should be used to not lose it Do not remove the ball retainer spring 24 unless replacement is required If necessary to remove this spring discard the retainer 24 if moved A screwdriver may be used to assist in the prying of the spring over the shoulder of the spool 22 Care must be used to avoid scratching or nicking of the spool outside diameter and control edges The following procedure is optional Return to the housing 25 which is mounted in the vise Remove the plug and roll pin assembly 28 A steel ball is captivated by the plug and roll pin assembly Care must be used to avoid the loss of the ball Remove ball by shaking after housing is removed from the vise Discard O ring 27 This completes the disassembly of the HGA unit Parker Hannifin Corporation Hydraulic Pump Motor Division Greeneville Tennessee Bulletin 2751 001 M1 USA Inspection and Replacement Visually inspect all parts and repla
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