Home

DUAL PISTON HYDRAULIC PUMPS .

1. CEPIS CP14 PUMP PISTON FCTION A o JA Pump Valves If the pump fails to supply pressure or if the pump piston is under pressure at all times the pump valves may need cleaning Stand pump in an upright position Remove the valve plug and seal Tilt the pump to remove valve springs and balls Allow oil to drain from the reservoir through these valve holes to wash foreign matter from the valve cavity Lay pump on its side to clean and inspect valve chamber Be careful not to mar or nick the ball valve seats Clean the valve balls and springs in solvent Replace rusted or corroded balls Do not stretch the ball springs To reassemble insert in sequence the small ball small spring large ball and large spring into the cleaned chamber Finally screw in valve seal plug Note that the seal kit contains the new style valve plug and seal This procedure should be carried out in all ball valve circuits If the valves fail to operate properly after they have been cleaned it may be necessary to reseat the valve balls Remove the springs and tap each ball lightly in its respective seat using the ball seating tool CP13 42 for the small ball and the 3 8 ball seating tool CP13 43 for the large ball Remove balls to make sure they are not stuck to the seats Reassemble pump valves as before See Air Bleeding instructions before attempting to operate the pump Release Valve Cam Type If the pump fails to lift or hold a load the release valve may
2. be dirty From back of pump remove the release valve plug release ball spring and 3 8 release ball From the front remove the release lever pin release lever and release plunger and seal Clean release valve chamber and inspect the ball seat If necessary re seat the release ball by tapping it lightly on the ball seat using the 3 8 ball seating tool CP13 43 Clean plunger and inspect the plunger packing and replace if necessary To reassemble insert the ball ball spring and release valve plug Lubricate the release plunger packing with hydraulic oil and carefully insert into the plunger chamber Re install the release lever and lever pin See Air Bleeding instructions before attempting to operate the pump REPAIR PARTS KIT HCP13 17 RP aie Release Valve Screw Type If the pump fails to lift or hold a load the release valve may be dirty Remove the release screw release valve seal and 9 32 release valve ball Clean and inspect valve seat and screw A slight depression in the end of the screw
3. DUAL PISTON HYDRAULIC PUMPS SERVICE MANUAL Hi Lo Two Speed Hand or Foot Operated aii Serres phate ebb ae eae ei with reservoirs STAR HYDRAULICS LLC 2727 CLINTON STREET RIVER GROVE ILLINOIS 60171 708 453 3238 www starhyd starhyd com MAINTENANCE In servicing hydraulic units clean liness is of the utmost importance A clean work place and proper tools are necessary to insure efficient and effective repair Special tools can be furnished on request NOTE Please specify pump model number when ordering parts If you are not sure of your pump model number call the factory and request a pump model identification sheet be faxed or e mailed to your Pump parts lists are also available for your model CP 15 PRESSURE PORT Sic D D Typical assembly drawing of two speed pump showing sectional view location TROUBLE POSSIBLE CAUSE CORRECTIVE REPAIR INSTRUCTIONS Pump will not hold pressure Pump fails to supply pressure Pump piston does not draw a full charge This is evident by a cushion effect at the top of the pump stroke Pump piston raises by itself under pressure Pump functions properly but will generate only a given pressure below its normal pressure maximum Pump fails to supply greater output at no load than under load Release valve ball not seati
4. dozen times Close the release valve Pump should be ready for use Oil If the pump fails to operate check the oil level before attempting any repairs The maximum fill level is 1 1 2 below the inside of the reservoir cover CAUTION Use only hydraulic oil when refilling NEVER USE BRAKE FLUID Pump Piston Leakage of oil around the pump piston may indicate worn or damaged piston packings To replace packings a Remove the piston actuating linkage b Remove the piston See piston section drawing A A Remove all packings see piston section drawing A A Clean all parts and dry with compressed air Install new packings wipers and static seals making sure that packing seal lips are face down toward the pressure Lubricate each part into clean hydraulic oil before assembly Open the release valve to allow air to bleed from the piston barrel back to the reservoir and insert the piston Replace piston linkage NOTE With release valve open stroke pump about a dozen times to bleed air completely from the pump iv an DADL TaD z S l P5 6 p 4 Esa t TAFT ie EY 1 6 y P5 6 NK a P4 4 a P5 4 g PS 4 ra 3 N 4 5 x ja E Ka z 7 Z a 4 YY Wey mg CP04
5. is not harmful Screws with excessive deformation should be replaced Re seat the release ball using the 4 ball seating tool CP13 42 To reassemble insert the release valve packing using inserting tool P1A 40 Reinstall the release screw See Air Bleeding instructions before attempting to operate the pump Overload Valve If the pump fails to lift or hold a load after the release valve and pump valves have been checked the overload valve may be dirty To clean the valve remove valve plug and valve plug seal Using a screwdriver remove the overload valve screw valve spring valve plunger and steel ball Clean and inspect valve cavity If the ball seat is marred re seat the overload ball by lightly tapping the ball on seat using tool CP13 45 Remove the ball to prevent sticking Reassemble the ball plunger spring and valve screw Connect a pressure gage to the pressure outlet Stroke the pump to obtain maximum desired pressure Turn the valve screw clockwise to increase the pressure reading and counter clockwise to reduce the maximum reading After valve is set properly replace valve plug Note that the seal kit contains the new style valve plug and seal See Air Bleeding instructions before attempting to operate the pump Large Piston Pump Relief Valve If the pump fails to lift faster under no load than it does under heavy load the large piston unloading valve may be dirty This valve is covered with a sealing compound t
6. ng properly Ball valves not seating properly Overload valve ball not seating properly Po ON S Large piston unloading valve seal faulty 1 Lack of oil Air bound pump Release valve ball not seating properly Small ball in valve circuit not seating properly Overload valve ball not seating properly SOR ON Large piston unloading valve seal faulty 1 Air bound system 2 Lack of oil Large ball in ball valve circuit not seating properly Overload valve not properly set Large piston unloading valve not set properly Refer to Release Valve notes Refer to Pump Valve notes Refer to Overload Valve notes Refer to Large piston unloading valve Refer to Oil notes Refer to Air Bleeding notes Refer to Release Valve notes Refer to Pump Valve notes Refer to Overload Valve notes Refer to Large piston unloading valve Refer to Air Bleeding notes Refer to Oil notes Refer to Pump Valve notes Refer to Overload Valve notes Refer to Large piston unloading valve Air Bleeding Air accumulation in a hydraulic system will cause erratic action This may appear as pump failure to the inexperienced user For this reason it is advisable to air bleed each pump before attempting to operate To remove air from the pump open release valve with the pump in an upright position Operate the pump slowly through the full piston stroke about a
7. o prevent tampering Remove the sealing compound valve screw spring and plunger with seals Use threaded socket tool CP 13 41 to remove plunger Clean and inspect the valve cavity Inspect the plunger packings and replace if necessary To reassemble lubricate the plunger seals with hydraulic fluid and carefully insert it back into the valve cavity taking care not to damage the seals Reassemble the spring and valve screw Tighten the screw to obtain the desired effort on lever bar at large piston change over point If the screw is tightened too far it will restrict the unloading valve movement and cause excessive handle effort throughout the high pressure cycle A DT YLT OTA AT Di ARK SHOWN KRI ARE HUWN DEI ADING VALVE TOOL T No CP13 41 o L a 1 4 BALL SEATING TOO a PART No CP13 42

DUAL PISTON HYDRAULIC PUMPS .

Contents

Download Pdf Manuals

Related Search

Related Contents