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Parker HP2 Series Service Procedure
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Parker HP2 Series Service Procedure

Hydrostatic tandem pumps
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HY13-1521-M1/US
Parker Hydrostatic
Tandem Pumps
Effective:
March, 2009
HP2 Series
Hydrostatic Tandem
Pump Service Procedure

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Summary of Contents for Parker HP2 Series

  • Page 1 HY13-1521-M1/US Parker Hydrostatic Tandem Pumps Effective: March, 2009 HP2 Series Hydrostatic Tandem Pump Service Procedure...
  • Page 2 ITEMS CAN CAUSE DEATH, PERSONAL INJURY AND PROPERTY DAMAGE. This document and other information from Parker Hannifi n 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.

  • Page 3: Table Of Contents

    Service Manual HY13-1521-M1/US Contents HP2 Series Hydrostatic Tandem Pumps General Information Section 1 General Information Defi nitions/Disclaimer ..........................4 Defi nitions/Disclaimer ..................4 Introduction/Design Features ........................ 5 Introduction/Design Features ................5 Troubleshooting Guide .......................... 6 Troubleshooting Guide ..................6 Troubleshooting Checklist ........................7 Troubleshooting Checklist ..................7...

  • Page 4: General Information

    Disclaimer This Service Manual has been prepared by Parker Hannifi n Corporation for reference and use by mechanics who have been trained to repair and service hydraulic pumps on commercial and non-commercial equipment appli- cations. Parker Hannifi n Corporation has exercised reasonable care and diligence to present accurate, clear and complete information and instructions regarding the techniques and tools required for maintaining, repairing and servicing the Parker HP2 Series Hydrostatic Tandem Pump.

  • Page 5: Introduction/Design Features

    Manual could be clearer and more complete. If so, let us know about it. Don’t try to second-guess the Service Manual; if problems occur that you cannot solve, please contact our service department at 423-639-8151, or your local Parker approved distributor. Servicing the HP2 Tandem Pump should be safe and productive. Visit our web site at www.parker.com/pumpmotor.

  • Page 6: Troubleshooting Guide

    Service Manual HY13-1521-M1/US General Information HP2 Series Hydrostatic Tandem Pumps Troubleshooting Guide Hydraulic Components NOTE Before troubleshooting any system problem, check service literature published by the If you think the problem is caused by a hydraulic com- equipment and/or component manufacturers.

  • Page 7: Troubleshooting Checklist

    Service Manual HY13-1521-M1/US General Information HP2 Series Hydrostatic Tandem Pumps Troubleshooting Checklist Cause Remedy Trouble Remove debris, replace seals using 1. Damaged seal. Oil Leakage seal kit p/n SK000234 for HP2 Tandem pump. Purge system per instructions. 2. Air trapped in system.

  • Page 8: Tools & Materials Required For Servicing

    Service Manual HY13-1521-M1/US General Information HP2 Series Hydrostatic Tandem Pumps Tools and Materials Required for Servicing • Clean, petroleum-based solvent • Emery paper CAUTION Mixing greases that have different • Vice with soft jaws bases can be detrimental to bearing •...

  • Page 9: Exploded Views

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  • Page 10: Exploded Views

    Service Manual HY13-1521-M1/US HP2 Series Hydrostatic Tandem Pumps General Information Item Description Item Description ADAPTER-EXPANSION TANK NUT - INSERT - NYLON THRUST BEARING HUB - FAN HOUSING SEAL RING THRUST WASHER SEAL - INPUT PISTON & BARREL ASSEMBLY SHAFT - PUMP...
  • Page 11 Service Manual HY13-1521-M1/US General Information Notes HP2 Series Hydrostatic Tandem Pumps Exploded View - Typical Parker Hannifi n Corporation Hydraulic Pump/Motor Division Greeneville, Tennessee USA...
  • Page 12 Discard all seals and seal rings as they are removed from the HP2 Tandem pump. Replace all seal rings and any damaged or worn parts with genuine Parker Hannifi n Corporation or OEM approved service parts. Parker Hannifi n Corporation...

  • Page 13: Disassembly

    Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Removal of fan 1. Clean and remove debris from exterior of pump to prevent contamination. Secure pump in vise using only mounting fl ange to prevent damage while servicing. NOTE Before troubleshooting any system...
  • Page 14 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Remove washer Remove fan Remove fan 4. Due to the taper in shaft, use an open end spacer wrench to pry fan spacer from one side to the other until loosened, or use a small gear puller.
  • Page 15 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Remove fan spacer Remove fan spacer 5. Place an alignment mark on the side of the Mark charge charge pump cover to housing assembly. This pump cover to will make reassembly easier.
  • Page 16 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Remove bolts 6. Remove two M8 x 1.25 bolts (19) on charge end cover using a 13mm socket. Remove bolts Removal of charge cover Parker Hannifi n Corporation Hydraulic Pump/Motor Division...
  • Page 17 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Remove seal 7. Watching for a loose ball and spring, lift off charge pump end cover. The O-ring (16) should be inside the base of the cover. Remove and inspect for damage.
  • Page 18 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Lift off charge pump rotor set Ball removal 10. Using a small amount of grease, remove check ball (15) from rear housing. Remove fi lter 11. Using a 5/8" socket remove fi lter. Replace later during reassembly with a new fi lter.
  • Page 19 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Check /shock 12. Remove shock (33), or check (34) valves on valve removal either side of the center block. (You will use: - 1/4" wrench insert for check valve - 11/16" socket on shock valves.) NOTE Replace any valve that may have heavy wear marks on the seat area.
  • Page 20 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Check /shock valve removal Bypass valve removal 13. Using a 5/8" socket, remove the bypass valves. Remove bypass valves Mark center block to rear housing Parker Hannifi n Corporation 19 20...
  • Page 21 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Remove two 14. Using a 13mm socket remove two of the (10mm) bolts from four bolts from the fan side housing block. fan side adjacent to each other Loosen two 15. Loosen slightly the two remaining bolts at remaining bolts at the fan side housing block.
  • Page 22 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Remove front 17. Using a gentle rocking motion, ease center housing bolts block assembly (31) off shaft. Piston barrel as- sembly should be left in the housing. NOTE The center block and rear housing as- sembly will still be bolted together.
  • Page 23 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Remove bolts from rear housing and center block Remove center 19. Using a gentle rocking motion, ease center block from rear block assembly (31) off shaft. Piston barrel as- housing sembly should be left in the housing.
  • Page 24 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Mark rear port 21. Using a felt tipped marker, mark the rear plate port plate (26) on the steel side with "R" or "Rear" to aid in reassembly. Remove front and 22.
  • Page 25 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Mark front port 24. Using a felt tipped marker, mark the front plate port plate (26) on the steel side with "F" or "Front" to aid in reassembly. Remove two 25. Remove two dowel pins (13) from each dowel pins housing.
  • Page 26 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Removal of 27. Check surface of rotating group and sides piston and barrel of pistons for excessive wear, indicated by assembly scoring. Remove pistons and check bores and springs for signs of scoring. Check top and OD of pistons for pitting or scratch marks.
  • Page 27 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Removal of thrust bearing assembly and swash block Remove thrust 29. Remove top washer of bearing race bearing assembly Remove bearing/ 30. Carefully remove bearing/cage and bottom cage and bottom race and check both the race and bearing/cage race for wear and damage.
  • Page 28 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Remove and 31. Inspect lower thrust washer for any spalling, check for wear galling or heavy wear on the bearing race. Removal of control 32. Remove control block from trunnion arm.
  • Page 29 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Remove shaft 34. Remove pump assembly from vise and hold with shaft approximately two to four inches above work table surface. Tap top of shaft with a soft mallet to loosen. Keep assembly as level as possible so as not to damage shaft and housing.
  • Page 30 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Rear shaft and washer removal NOTE This washer is only used on the rear housing assembly. 36. Remove shaft (5) from rear housing. Shaft washer (24) should come out with shaft.
  • Page 31 Service Manual HY13-1521-M1/US Disassembly HP2 Series Hydrostatic Tandem Pumps Inspection of cradle bearing NOTE Bearing strips are in the bottom of each housing assembly. Bearing strips are removable, but if not damaged can be reused and would not require removal.

  • Page 32: Assembly

    Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Assembly Preparation Clean and liberally lubricate all parts prior to reassembly to ensure contact and sealing. Press in trunnion 1. Using an arbor press and a socket with an arm seals O.D.

  • Page 33: Assembly

    Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Rear shaft and 4. Place washer (24) onto shaft (5) and install washer installation into rear housing. Install rear control block 5. Install control block (9) onto tip of trunnion arm in rear housing.
  • Page 34 Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Place bottom 8. Place bottom bearing race (2) into place, bearing race into aligning notch with pin, if pin is present. place NOTE The bottom race is the thinner of the two races.
  • Page 35 Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Install central 10. Place spring (11) over rear shaft as shown. spring into rear housing 11. Tilt pump housing on side at slightly less Install rotating than a 90-degree angle (see photo). Slide in as-...
  • Page 36 Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Make sure seal is fl at in groove Place two 13. Place two alignment pins (13) into rear hous- alignment pins ing. into rear housing Place port plate 14. Place the port plate (26) marked "Rear"...
  • Page 37 Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Rear side of center block Front side of center block Insert shaft into 15. Insert the splined section of the front shaft front side of into the front of the center block. Align the...
  • Page 38 Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Align center block 16. Place center block and front shaft onto to rear housing rear housing. Rotating the front shaft, align the splines on the rear shaft to the coupler. Press straight down on the center block as the front shaft is turned.
  • Page 39 Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Front shaft components NOTE Make sure front section trunnion arm is in place before proceeding to the next step. 19. Place shaft (30) into front housing. Place washer (18) into housing. Lubricate I.D. and O.D.
  • Page 40 Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Install snap ring 21. Using internal snap ring pliers, put snap ring (10) in place. Install control block 22. Install control block (9) onto tip of trunnion arm in front housing.
  • Page 41 Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Install bearing/ cage assembly Install top bearing race Install swash 24. Align swash block (8) with control block (9) block/thrust using a small screwdriver. Slide block over shaft bearing assembly (24) and control block. Verify swash block is over both cradle bearings and moves freely.
  • Page 42 Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Install swash block/thrust bearing assembly Install central 25. Place spring (11) over shaft as shown. spring Install rotating 26. Tilt pump housing on side at slightly less group than a 90-degree (see photo). Slide in assem- bly (21) over shaft splines and return pump to upright position.
  • Page 43 Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Installed rotating group Place pins in front 27. Place two alignment pins (13) into front housing housing. Place port plate 28. Place the port plate (26) marked "Front" marked "Front" steel side up on top of the front housing rotating on top of rotating group.
  • Page 44 Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Place housing seal 29. Liberally lubricate housing seal (3) and place into groove in groove. Make sure it is fl at by running fi ngers around top. NOTE Seal can be pinched easily by housing if not secure in groove.
  • Page 45 Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Tighten and 32. Install the other two bolts into the front torque bolts housing and tighten all four bolts. Torque all eight housing bolts to 31.9–38.6 Nm (282–342 in/lbs). Install two bypass 33.
  • Page 46 Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Install fi lter 35. Lubricate both o-ring seals on fi lter assem- element bly and hand tighten into center block. Tighten fi lter 36. Tighten fi lter assembly using a 5/8" socket element wrench.
  • Page 47 Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Install charge 38. Place rotor and stator over the shaft aligned rotor set with the splines of shaft. Charge rotor set 39. Install new o-ring (16) in charge cover. installed Install o-ring and 40.
  • Page 48 Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Align charge cover 41. Align charge cover with mark made during with marks disassembly, ensuring that spring aligns with check ball. Install bolts Hand tighten bolts 42. Drop in two bolts (19) and hand tighten.
  • Page 49 Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Install fan spacer 43. Place fan spacer (23) on shaft with mill groove facing up. Place fan on 44. Slide fan (32) onto shaft with code imprint in spacer center facing up. Place special washer (21) on shaft, positioning so that the tabs fi t into inden- tions in fan's center.
  • Page 50 Service Manual HY13-1521-M1/US Assembly HP2 Series Hydrostatic Tandem Pumps Place nut on shaft 45. Fasten one 3/8-24 nylon insert nut (22) on and tighten the shaft and tighten 10.8 Nm (100 in/lbs) with 9/16" wrench. Replace nylon nut if damaged.

  • Page 51: Maintenance

    Parker Pump/Motor Operation extends close technical cooperation and assistance. If problems occur which you cannot solve, please contact our service department at (423) 639-8151, or your local Parker approved distributor. Parker Hannifi n Corporation Hydraulic Pump/Motor Division...

  • Page 52: System Maintenance Tips

    Service Manual HY13-1521-M1/US Notes HP2 Series Hydrostatic Tandem Pumps Final Checks • Using an adjustable wrench, place on the fl ats of shaft (30) and make sure the shaft turns freely prior to installing on equipment. • Pressurize the case drain port for 25 PSI dry air or nitrogen and submerge in solvent to check for exter- nal leaks.

  • Page 53: Hydraulic Fluids

    Service Manual HY13-1521-M1/US Notes HP2 Series Hydrostatic Tandem Pumps Parker Hannifi n Corporation Hydraulic Pump/Motor Division Greeneville, Tennessee USA...
  • Page 56 Parker Hannifi n Corporation Hydraulic Pump/Motor Division 2745 Snapps Ferry Road Greeneville, TN 37745 USA Tel. (423) 639-8151 (423) 787-2418 www.parker.com/pumpmotor...

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