RD2300 I&M Manual
Contents
1. 10 Gr 90 110 Lower Shock Absorber Mounting Bolts 3 4 16 Gr 90 110 Air Spring Mount Nut 1 2 13 Gr 30 40 Lower Air Spring Mounting Nut 1 2 13 Gr 20 30 Height Control Linkage Stud Mount 5 16 18 Gr 2 Link to Cross Member Bolt 5 8 11 Gr8 Air Spring Cross member Mounting Bolts 3 4 10 Gr 8 23 Revco Granning SUSPENSIONS ISO 9001 2008 Certified Mount Vernon 1 800 753 0050 1205 Industrial Park Drive Mount Vernon MO 65712 800 753 0050 Fax 417 466 3964 www reycogranning com2. 5 Remove the V Link Assembly Installation 1 Replace the V Link in the same order in which it was removed Torque the 4 bolts holding the V link to the Cross member to 150 180 ft Ib See Torque Table Reconnect the Axle to the V Link Be sure to use the proper spacers to maintain the desired Pinion Angle and then torque the nut to 400 495 ft Ib See Torque Table Relive anv support holding the axle up allowing it to float Re inflate the airbags so that the Bus can be lowered Check and adjust ride height per Adjusting Suspension Ride Height Section Section 6 Repair TORQUE SPECIFICATIONS Most threaded fasteners are covered by specifications that define required S mechanical properties such as tensile strength yield strength proof load and eae Me ok x CJ ies hardness These specifications are carefully considered in initial selection of Figure 5 Grade Markings on Bolts fasteners for a given application To assure continued satisfactory vehicle Grade Lock Nut Lock Nut Grade B F Grade C G performance replacement fasteners used Identification should be of the correct strength as well as the correct nominal diameter thread pitch 3 Dots 6 Dots length and finish Figure 6 Grade Markings on Lock Nuts Torque Table APPLICATIONS FASTENER TORQUE SPECIFICATION SIZE ft lb CLEAN AND DRY Spring Beam Pivot Nut l 1 8 12 Gr C 950 1050 pper Shock Absorber Mounting Bolts 3 4
3. assembly as described above 2 Push the bushing out using a properly sized bushing press 3 Push in new bushing 4 Reinstall as per the previous instructions 20 Replacing the Shock Absorber Preparation 1 Set the parking brake and block the front wheels to prevent vehicle movement Removal 1 Loosen and remove the upper shock absorber mount bolt from the upper Shock Mount 2 Loosen and remove the lower shock absorber mount bolt from the trailing Arm Installation 1 Install the upper shock absorber Fasten using the bolt 2 Install the lower shock absorber bolt loosely to the trailing arm assembly 3 Raise or lower the suspension to approximately ride height 4 Torque both mount fasteners to 90 110 ft lb See the Torque Table Replacing the Air Spring When replacing the air spring be sure that the correct replacement air spring is installed The use of a substitute air spring that is not recommended by ReycoGranning may cause unequal load sharing between the air springs which may be detrimental to vehicle ride and handling Preparation 1 Set the parking brake and block the front wheels to prevent vehicle movement Section 6 Repair 2 Firmiv support the rear of the vehicle frame Replacing the Height A WARNING Never work under Co ntrol Valve a vehicle supported by only a jack Jacks can slip or fall over and cause serious personal Preparation injurv Alwavs us
4. important for correct service Some procedures require the use of special tools for safe and correct service Failure to use these special tools when required can cause personal injury or damage to suspension components ReycoGranning Air Suspensions reserves the right to modify the suspension and or procedures and to change specifications at any time without notice and without incurring obligation Section 1 Introduction Introduction ReycoGranning Air Suspensions has developed this service manual to aid in the maintenance of ReycoGranning s rear suspensions The following table lists the various models and their respective capacities Model Capacity Axle Cap RD2300NR T 20 000 lbs 20 000 Ibs RD2300NR T 23 000 lbs 23 000 lbs RD2300NR WR 23 000 lbs 23 000 lbs Overloading the suspension may result in adverse ride and handling characteristics Section 1 Introduction Identification The suspension model and serial number are stamped on an aluminum tag that is riveted to the driver side upper Hanger Weldment See Figure 2 The serial number is used bv ReycoGranning for control purposes and should be referred to when servicing the suspension See Figure 1 Revco Granning TR SERIAL 000000 GAWRILBS MoDEL RD2300NR 20 000 MAY BE COVERED BY THE FOLLOWING PATENTS OTHER PENDING U S 4 506 910 6 158 750 6 176 501 7 434 821 CANADA 1 194 044 Figure 1 Suspension Identificat
5. securely after positioning it squarely across the frame The use of a carpenter s square is recommended to be certain the bar is square to the frame 4 The cross bar should be positioned as far forward of the drive axle as room will permit Beginning on the passenger side measure from the bar stock to the center line of the rear drive axle on both sides If the measurements Xi and X2 vary more than 1 8 alignment adjustment should be made Once the rear drive axle is properly aligned the front axle should be aligned as per the recommended procedure gt X Xo gt Figure 4 Alignment measurements 8 Following the alignment of both axles it is recommended that it be driven through a short series of turns and then returned to the shop to have the alignment rechecked after again freeing all suspension joints by moving back and forth several times Adjustment 1 2 Chock the front wheels Securelv support the rear frame of the vehicle Section 5 Adjustments and Alignments NOTE 3 8 Total adjustment is available 3 16 Side x 2 adjustment points A WARNING Never work under a vehicle supported by only a jack Jacks can slip or fall over and cause serious personal 6 Retorque the Pivot Bolt to 950 injury Always use safety 1050 ft lb See To
6. 01 Shock Bracket Section 1 Introduction Description Axle Thru Bolt Mounting Components Item Part No Description Itemj PartNo Description 1 705429 02 Tube Inner Spacing 6 104098 HFW 7 8 968 x 1 780 x 160 ZP 2 705429 03 Boss Mounting 7 100122 P1 LN 7 8 9 UNC Stover GR C ZP 3 705429 04 JHHB 3 4 16 X 6 500 8 None Customer Supplied Axle 4 705429 05 FW 3 4 811 X 1 375 X 104 9 8223552 HHB 7 8 9 X 5 GR 8 ZN 5_ 705429 06 LN 3 4 16 Part of Thru Bolt Bushing Kit PN 705429 07 The Spacers are used to achieve different pinion angles or to make slight adjustments RD2300NR T Shown Without Kit Three Section 2 Troubleshooting Suspension System General 1 Put specified air pressure in Tires wear out quickly or have uneven tire tread wear possible cause s Consult tire manufacturer for guidance ehicle rolls side to side Vehicle ride is too harsh and or suspension contacts stops excessively ehicle ride is too soft Suspension does not maintain ride height Tires have incorrect pressure Tires out of balance Incorrect ride height Incorrect rear axle alignment Improper mismatched tires and wheels 1 Front and or rear shock bsorbers worn Shock mounting loose 3 Shock eye bushings worn 4 Trailing Arm bushings worn b Check for air leak including he height control valve 1 Shoc
7. E se fF Reyco Granning SUSPENSIONS Motorhome Suspensions Owner s Manual RD2300 I Parallelogram Rear Drive Suspension Maintenance Instructions Service Parts Document D707409 Revision E Revision Date 4 13 Revco Granning Suspensions 1 8 0 0 7 5 3 0 0 5 0 1205 Industrial Park Drive LI Mount Vernon MO 65712 Phone 417 466 2178 www reycogranning com r A RD2300NR SUSPENSION SERVICE MANUAL Service Notes This Service Manual describes the correct service and repair procedures for the ReycoGranning RD2300NR Rear Drive Suspension The information contained in this manual was current at the time of printing and is subject to change without notice or liability You must follow your company safety procedures when you service or repair the suspension Be sure you read and understand all the procedures and instructions before you begin work on the suspension ReycoGranning uses the following types of notes to give warning of possible safety problems and to give information that will prevent damage to equipment A WARNING A warning indicates procedures that must be followed exactly Serious personal injury can occur if the procedure is not followed A CAUTION A caution indicates procedures that must be followed exactly Damage to equipment or suspension components and personal injury can occur if the procedure is not followed NOTE A note indicates an operation procedure or instruction that is
8. IXIXIXIXIXIX Air Springs Inspect for proper clearance 1 minimum all around Check upper mount nut and lower mount bolt torque Inspect for signs of chafing or wear XIXIXIXIXIXIXI Check for air line fitting torque Inspect for air leaks using soapv water solution Height Control Valve Inspect for signs of bending binding or IXIXIXIXIXIXIXJX Linkage slippage Shock Absorbers Check stud mount and lock nut torque X L I Inspect shocks for signs of fluid leak broken eye ends loose fasteners or worn bushings Air Fittings and Air Lines Inspect for signs of chafing cracking or wear 1 Continue to perform specified maintenance every 12 000 miles or at previous interval 14 Section 4 Maintenance MAINTENANCE RECORD Name of Owner Address of Owner Date of Purchase Name and Address of Dealer Model of Vehicle ehicle Identification Number Suspension Model Number Suspension Serial Number RD2300NR Inspection and Maintenance Service Performed EE 15 Section 5 Adjustments and Alignments Adjusting Suspension Ride Height The height control valve and linkage should be checked regularly for proper clearance operation and adjustment The ride height of the rear suspension is the distance from the bottom of the chassis frame rail to the center of the axle Properlv adjusted ride height results in cor
9. ation arm and inflate the air springs the vertical link of the 6 Check the air fittings for leaks replacement HCV the same as the 21 Section 6 Repair removed HCV 2 Assemble anv other plumbing fixtures to the HCV as marked for re connection 3 Mount the replacement HCV to the frame rail with bolts nuts and washers Tighten the nuts to 60 80 in lb See Torque Table A Reconnect air lines and check for proper operation and leaks 5 Check and adjust ride height per Adjusting Suspension Ride Height Section Replacing the V Link Preparation 1 Set the parking brake and block the front wheels to prevent vehicle movement 2 Firmly support the rear vehicle frame A WARNING Never work under a vehicle supported by only a jack Jacks can slip or fall over and cause serious personal injury Always use safety stands Deflate the air springs 4 Support the rear axle to relieve any pressure being applied to the V link Removal 1 Disconnect the V Link from the axle and remove the bolts and pinion angle spacers 2 Ifthe bolts are not easily removed the axle needs to be either raised 22 or lowered to relive excessive pressure on the V Link Remove both inner bolts on the V Link so that it is still supported by the two outer V Link bolts Make sure the V Link assembly is fully supported before removing the final two bolts holding it place A WARNING V link is very heavy
10. e safetv 1 Set the parking brake and block stands the front wheels to prevent vehicle movement 3 Deflate the air springs 2 Firmly support the rear vehicle frame Removal 1 Disconnect the air line at the air spring and remove the connection fitting A WARNING Never work under a vehicle supported by only a jack Jacks can slip or fall over and cause serious personal injury Always use safety 2 Remove the bolts that secure the air spring to the lower crossmember assembly stands 3 Remove the nuts and washers from the upper frame rail mount 3 Deflate the air springs 4 Remove the air spring Removal Installation 1 Mark air line connections for re 1 Assemble the nuts and washers assembly Disconnect the air lines that connect the air spring to the from the HCV If any other frame rail Tighten the nuts to plumbing fixtures are connected to appropriate torque per chassis the HCV mark them for re MFG requirement assembly 2 Assemble the air spring to the 2 Disconnect the vertical link from crossmember assembly Tighten the trailing arm the bolts to 20 30 ft lb See 3 Remove the mounting bolts nuts Torque Table washers and HCV from the Frame 3 Install the connection fitting into Rail the air spring Use Permatex or 4 Remove any other plumbing equivalent thread sealant fixtures from the HCV 4 Connect the air line to the air spring Installation 5 Lower the vehicle frame and 1 Assemble the actu
11. ion Figure 2 Suspension Identification Location Standard Section 1 Introduction Figure 3 Suspension Identification Location WR Section 1 Introduction Kit One Hangers and Lower Control Arms Standard 1707373 Weldment Hanger LH 10 166 JLN11 8 12 Gr C ZY O 21 Rey Align Adjust Shaft 22 5 705450 Wear Spacer Polyethylene 16 89429523 FW 1 1 062x1 75x 10PL 6 1705454 Flange Washer 17 24453 01 Coiled Spring Pin 7707070700 7 710513 Rey Alin isf 2617 Plate Seria No __8__ 705458 JWasher Disk Spring 9 17702516 HHB 1 1 8 12 x 7 3 4 Gr 8 ZN 20 706260 01 Wear Spacer Polyethylene Section 1 Introduction WR Kit Section 1 Introduction Kit Two Upper Control Arm Item Part No Description HHB 5 8 11 X 2 1 4 GR8 707378 02 Weldment V Link Mount RH 8455851 SLW 5 8 651 x 1 250 x 166 ZN 707377 01 Cross Member FHB 13 x 1 25 Gr 8 ZN 3 vi V Link 8 308 LFN 13 Gr G Zine Section 1 Introduction Kit Three Shock Air Bags and HCV Item Part No Description Item PartNo Description 1 706924 01 Air Spring Support 6 706206 01 Shock Absorber 2 8103323 SLW 1 2 523x 873x 135 PL 7 103003 HFW 812 x 1 475 x 150 3 8120378 JN 1 2 13 GR 5 ZP 8 8223831 JHHB 16x 3 Gr 8 ZN 4 89415543 JEW 531x1 25x 100 ZN 9 178 LFN 16 Gr 6 5 707402 01 Air Spring Firestone 10 707923
12. k absorbers worn Incorrect ride height 8 Vehicle overloaded 4 Air spring supply lines leaking or obstructed b Vehicle system air pressure below specification 6 Jounce bumper in air spring orn or broken 1 Shock absorbers worn Incorrect ride height 4 Air spring chafed or worn 10 A Align rear axle to specified hrust angle Install correct tire and wheel ombination 1 Replace shock absorbers as 2 Check and tighten as Check and replace as needed 4 Inspect and replace as Check height control valve and replace as required 1 Replace shock absorbers as Check wheel loads and correct as needed 4 Check air line connections and remove obstructions Check air pressure and 6 Check and replace air spring as required 1 Replace shock absorbers as 1 Check connections with soapy ater solution and repair or 4 Check air spring and replace as needed Section 3 Inspection General Inspection Perform a thorough visual inspection of the suspension to ensure proper assemblv and to identifv broken parts and loose fasteners each time the vehicle suspension is serviced Do the following during an inspection e Wheel Alignment Follow the guidelines in Section 5 for wheel alignment inspection intervals Check wheel alignment if excessive steering effort vehicle wander or abnormal tire wear is evident e Fasteners Check that all the fasteners are tightened to the pro
13. king the Shock Absorber NOTE RevcoGranning recommends the use of a maintenance pit or full vehicle lift during the inspection of components Preparation 1 Set the parking brake and block the drive wheels to prevent vehicle movement Inspection 1 Check shock absorber for oil leakage bent components missing or broken components excessive corrosion or worn bushings Replace shock if anv of the above items is present Checking the Air Spring and Height Control Valve Preparation 1 Set the parking brake and block the drive wheels to prevent vehicle movement 2 Refer to Firestone Preventative Maintenance Checklist for additional air spring information Air Spring Inspection 1 Check the outside diameter of the air spring for irregular wear or heat checking 2 Check air lines to make sure contact does not exist between the air lines and the outside diameter of the air spring Re secure air lines to prevent contact as needed 12 Check for air line and fitting leaks with soapy water solution 3 Check to see that there is minimum of 1 inch clearance around the circumference of the air spring while it is energized with air 4 Check the air spring piston for build up of foreign material Remove any foreign material that is present Height Control Valve Inspection 1 Check the height control valve and linkage for damage Replace components as needed 2 Measure the ride height of the suspen
14. n in Section 3 Wheels and Tires 1 Check that the rear tires are inflated to the appropriate pressure based on the wheel loading 2 Check that the rear tires are the same size and type 3 Check that all the wheel nuts are tightened to the specified torque 4 Check that the wheels are balanced 5 Check that all fasteners are tightened to the specified torque 6 Check the suspension ride height and adjust as needed to specified height 7 Check that all connection joints between the suspension and axle are secure Section 5 Adjustments and Alignments 8 Check for worn suspension bushings or damaged suspension components 9 Check that the frame is not bent 10 Loosen the Rev align nut but do not remove 11 Rotate the adjusting fastener to move the rear axle fore and aft on each side Continue until vou achieve the correct alignment 12 Retorque the Pivot Bolt to 950 1050 ft Ib See Torque Table Step 1 150 ft lb Step 2 250 ft lb Step 3 400 ft lb Step 4 650 ft Ib Step 5 950 1050 ft Ib NOTE Total vehicle alignment is recommended when aligning the rear suspension Rear Axle Alignment Measurement 1 Place the unloaded vehicle on a level floor area Move it back and forth several times slowlv and without using the brakes to free all suspension joints 2 Chock the front wheels with the brakes released 3 Clamp an 8 foot piece of straight bar stock or angle iron
15. on tanks with a weak alkaline solution Parts should remain in the hot solution tanks until they are completely cleaned Drying 19 Parts must be dried immediately after cleaning Dry parts with clean paper or rags or compressed air Preventing Corrosion Apply light oil to cleaned and dried parts that are not damaged and are to be immediately assembled If the parts are to be stored apply a good corrosion preventative to all surfaces and place them inside special paper or containers that prevent corrosion Removing and Installing the Trailing Arm Assemblies Preparation 1 Chock the front wheels 2 Firmly support the rear vehicle frame A WARNING Never work under a vehicle supported by only a jack Jacks can slip or fall over and cause serious personal injury Always use safety stands Removal 1 Exhaust the air from the air spring 2 Detach the air spring from the Cross Member Remove the Lower Cross Member 4 Remove Axle Bolts Remove Shocks and Height Control Valve Linkages 6 Loosen the pivot bolt nut Section 6 Repair Installation 1 Slide the trailing arm assemblv into the pivot hanger 2 Insert the pivot bolt with all rev align components 3 Torque the Pivot Bolt to 950 1050 ft Ib See Torque Table Step 1 150 ft lb Step 2 250 ft lb Step 3 400 ft lb Step 4 650 ft Ib Step 5 950 1050 ft Ib Replacing the Trailing Arm Bushings 1 Remove the Trailing Arm
16. per tightening torque Use a calibrated torque wrench to check torque e Wear and Damage Inspect components of the suspension for wear and damage Look for bent or broken components Replace all worn or damaged components e Operation Check that all components move freely through the complete turning arc A CAUTION RevcoGranning recommends replacing anv damaged or out of specification components Reconditioning or field repairs of major rear suspension components is not allowed Note Refer to Section 1 for identification of components 11 Checking the Trailing Arm Bushings for Wear NOTE ReycoGranning recommends the use of a maintenance pit or full vehicle lift during the inspection of components Preparation 1 Chock the front wheels to prevent vehicle movement 2 Raise the rear of the vehicle until the wheels are off the ground Support raised vehicle with safety stands Do not place jacks or safety stands under the Trailing Arms to support the vehicle A WARNING Never work under a vehicle supported by only a jack Jacks can slip or fall over and cause serious personal injury Always use safety stands 3 Remove the tires Inspection 1 Inspect rubber bushings for large splits tears and major wear Replace bushings as needed 2 Check that the Trailing Arm mounting bolts are tight The recommended torque is 210 240 ft Ib See Torque Table Section 3 Inspection Chec
17. rect suspension travel and alignment The ride height should not be adjusted to adjust chassis rake angle Preparation 1 Park the vehicle on a level surface 2 Set the parking brake and block the drive wheels to prevent vehicle movement 3 Check that the front suspension is adjusted to the correct ride height per the vehicle manufacturers specifications 4 Check height control valve plumbing to ensure there are not any air leaks 5 Make sure shock mounts are mounted securely and not bent Adjustment 1 Measure the distance from the bottom of the frame to the center of the axle If the distance measured is not within 7 00 25 inches then adjust as follows 2 Loosen the clamp on the vertical link of the height control linkage 3 Adjust the length of the vertical link to achieve specified ride height If the measured distance is less than 7 00 inches then increase the length of the vertical 16 link If the measured distance is greater than 7 00 inches then decrease the length of the vertical link Wait 30 seconds for the suspension to settle after adjusting to verify correct adjustment NOTE The horizontal link must remain horizontal during adjustment to ensure proper operation of the height control valve 4 Tighten the clamp on the vertical link Inspection Before Alignment Check the following before conducting front wheel alignment measurements Inspection See General Inspectio
18. rque Table stands Step 1 150 ft Ib 3 Exhaust the air from the air Step 2 250 ft lb springs to remove the load to the Step 3 400 ft lb Trailing Arm Step 4 650 ft lb 4 Loosen the Rey align nut but do Step 5 950 1050 ft lb not remove 5 Rotate the adjusting fastener to move the rear axle fore and aft on each side Continue until you achieve the correct alignment 18 Section 6 Repair Repairing of Parts A WARNING The repair or reconditioning of rear suspension components is not allowed RevcoGranning recommends replacing damaged or worn components Several major components are heat treated and tempered The components cannot be bent welded heated or repaired in any wav without reducing the strength or life of the component and voiding the warrantv A WARNING If you use cleaning solvents hot solution tanks or alkaline solutions incorrectly serious personal injury can occur To prevent injury follow the instructions supplied by the manufacturer Do NOT use gasoline to clean parts Gasoline can explode Cleaning the Parts Ground or Polished Parts Use a cleaning solvent to clean ground or polished parts and surfaces Do NOT clean ground or polished parts with hot solution tank or with water steam or alkaline solutions These solutions will cause corrosion of the parts Rough Parts Rough parts can be cleaned with the ground and polished parts Rough parts also can be cleaned in hot soluti
19. sion The ride height should be 7 00 inches It is measured at the axle centerline and is the distance from the bottom of the chassis frame rail to the center of the wheel 3 The actuation arm of the height control valve should be horizontal at ride height See section 5 for adjusting to correct ride height Section 3 Inspection Checking the V Link Bolts and Bushings Preparation 1 Chock the front wheels to prevent vehicle movement 2 Raise the rear of the vehicle until the wheels are off the ground Support raised vehicle with safetv stands Do not place jacks or safetv stands under the Trailing Arms to support the vehicle A WARNING Never work under a vehicle supported by only a jack Jacks can slip or fall over and cause serious personal injury Always use safety stands Inspection 1 Inspect rubber bushings for large splits tears and major wear Replace bushings as needed Check that the V Link to V Link Mount Weldment mounting bolts are tight The recommended torque is 150 180 ft Ib See Torque Table Check that the V Link Axle Mounting bolts are tight The recommended torque is 400 495 ft Ib See Torque Table 13 Section 4 Maintenance MAINTENANCE SCHEDULE SERVICE TO BE PERFORMED MAINTENANCE 12 24 36 48 60 72 84 96 Trailing Arm Check bolt torque hx x JXl Bushings Inspect for contact between controlarm IXIXIXIXIXIJXIXJXI and mount Inspect for bushing wear XIX
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