P SeriesHydrostatic PumpsService and Repair ManualBLN-52503August, 2010PCPJPWPRPG/PEPK
5P SeriesFigure 4. PK Pump With Standard Charge Pump EXTERNAL FEATURES - PK SERIES
95PR SeriesRefer to Figure 4.Disassembly1. Remove retaining ring (3) from housing (15).2. Remove lip seal (6). Care must be taken to preve
96 PR SeriesRefer to Figure 6.DisassemblyPerform disassembly, inspection and assembly on check valves one side at a time. Some units vary in “A” side
97PR SeriesRefer to Figure 8.Disassembly1. Loosen the bypass valve (50) using a 5/8” wrench.2. Remove the bypass (50) from the end cap
98 PR SeriesRefer to Figure 9.Disassembly1. Prior to removal of the charge pump cover, place a mark on the cover and end cap for alignment at assembl
99PR SeriesRefer to Figure 10.Disassembly1. Prior to removal of the auxiliary pump, place a mark on the auxiliary pump, charge pump (41) and end cap
100 PR SeriesRefer to Figure 11.Disassembly1. Using any combination of two, 9/16” wrenches or 9/16” socket and ratchet drive, loosen the end c
101PR SeriesRefer to Figure 12.Disassembly1. Tilt the pump on its side, drain remaining oil. Lift out the cylinder block assembly (38).2. Remove the
102 PR SeriesRefer to Figure 13.Disassembly1. Remove the block spring (20).2. Remove the thrust washer (19).3. Remove the thrust bearing and race (
103PR SeriesREMOVAL, INSPECTION AND ASSEMBLY OF INPUT SHAFTRefer to Figure 15.Disassembly1. Remove the retaining ring (3).2. Remove the lip seal (6)
104 PR SeriesRefer to Figure 16.Disassembly1. Remove and discard the trunnion seal retainer and seal (12).2. Remove the slot guide (14).3. Remove t
6 P SeriesFigure 4. PR Pump With Standard Charge Pump EXTERNAL FEATURES - PR SERIESTRUNNION ARMINPUT SHAFTCHARGE PRESSUREDIAGNOSTIC PORT“A” and “B” PO
105PR Series
106 PR SeriesFigure 17. PR PumpBOXES INDICATE ITEMS INCLUDED IN KITS. Kit Number
107PR SeriesITEM LIST - PR SERIESPart numbers are not provided in this manual. See CD (BLN-51427) for part numbers.1 Pump Shaft Kit (19T spline) Pum
108 PR Series
109PW SeriesHOW TO USE THIS MANUALEach assembly is provided with an exploded view showing the parts involved. The item reference numbers
110 PW SeriesTOOLS AND TORQUESTable 1. Required ToolsTable 2. PW Pump Torque ValuesMiscellaneousP Series Service & Repair ManualTorque WrenchScrib
111PW SeriesPrior to disassembly, note the position of the scis-sor arm brackets and the tab on the outer control arm bracket.See Figure 1.Disassembly
112 PW SeriesREMOVAL, INSPECTION AND/OR REPLACEMENT OF CONTROL ARMREMOVAL, INSPECTION AND/OR REPLACEMENT OF FAN ASSEMBLYRefer to Figure 3.Disassembly1
113PW SeriesRefer to Figure 4.Disassembly1. Remove retaining ring (3) from housing (15).2. Remove lip seal (6). Care must be taken to prev
114 PW SeriesRefer to Figure 6.DisassemblyPerform disassembly, inspection and assembly on check valves one side at a time. Some units vary in “A” side
7P SeriesEXTERNAL FEATURES - PW SERIESFigure 5. PW Pump With Standard Charge Pump CHARGE COVERSTANDARD CHECK VALVE OR SHOCK VALVESTANDARD CHECK VALVE
115PW SeriesRefer to Figure 8.Disassembly1. Loosen the bypass valve (50) using a 5/8” wrench.2. Remove the bypass (50) from the end ca
116 PW SeriesRefer to Figure 9.Disassembly1. Prior to removal of the charge pump cover, place a mark on the cover and end cap for alignment at assemb
117PW SeriesRefer to Figure 10.Disassembly1. Prior to removal of the auxiliary pump, place a mark on the auxiliary pump, charge pump (41) and end cap
118 PW SeriesRefer to Figure 11.Disassembly1. Using any combination of two, 9/16” wrenches or 9/16” socket and rachet drive, loosen the end cap bolts
119PW SeriesRefer to Figure 12.Disassembly1. Tilt the pump on its side, drain remaining oil. Lift out the cylinder block assembly (38).2. Remove the
120 PW SeriesRefer to Figure 13.Disassembly1. Remove the thrust bearing and race (17).Inspection1. Inspect the running surface of the bearing race f
121PW SeriesREMOVAL, INSPECTION AND ASSEMBLY OF INPUT SHAFTRefer to Figure 15.Disassembly1. Remove the retaining ring (3).2. Remove the lip seal (6)
122 PW SeriesRefer to Figure 16.Disassembly1. Remove trunnion seal retainer and seal (12).2. Remove the slot guide (14).3. Remove the trunnion arm
123PW Series
124 PW SeriesFigure 17. PW Pump85- Overhaul Seal KitBOXES INDICATE ITEMS INCLUDED IN KITS. Kit Number
8 P SeriesHYDRAULIC SCHEMATICFigure 6. PC, PG, PJ, PK and PR Pumps with Standard Charge PumpOrice sizeNo Bleed.024 Bleed.031 Bleed.044 BleedRelief pr
125PW SeriesITEM LIST - PW SERIESPart numbers are not provided in this manual. See CD (BLN-51427) for part numbers.1 Pump Shaft Kit (19T spline) Pum
126 PW Series
127P SeriesGLOSSARY OF TERMSAxial Piston: Type of design for hydraulic motors and pumps in which the pistons are arrangedparallel with the spindle (in
128 P SeriesHydrostatic Transmission: The combination of a hydraulic pump and motor in one housing toform a device for the control and transfer of pow
© 2010 HYDRO-GEARPrinted in U.S.A.Rev. P3
9P SeriesHYDRAULIC SCHEMATICFigure 8. PW Series Pump With Standard Charge Pump Figure 9. PW Series Pump With Auxiliary Charge Pump Orice sizeNo Bleed
10 P SeriesFigures 10 represents a graphical schematic of the P Series Pump with standard charge pump. Figure 10 provides a graphical illustration of
11P SeriesTECHNICAL SPECIFICATIONSTable 1: P Series Pump Technical SpecicationsProduct Type PC PG PJ/PK PR PWDisplacement in3/rev 0.37 0.62
12 P SeriesFigure 11. P Series Pump Conguration LabelPRODUCT IDENTIFICATIONThe label in Figure 11 is located on the pump housing. It identies the mo
13P SeriesThis symbol points out important safety instructions which, if not followed, could en-danger the personal safety and/or property of you
14 P SeriesSECTION 3. TROUBLESHOOTING WARNINGDo not attempt any servicing or ad-justments with the engine running. Use extreme caution wh
15P Series Possible Cause Corrective ActionUNIT HAS NO/LOW POWEREngine speed low Adjust to correct rpm
16 P SeriesP SERIES FLOW TEST KIT INSTRUCTIONSBLN-51334 JULY 2010(This Instruction Sheet supersedes all previous ow testing instructions)Description:
17P SeriesNote: Raising the system oil temperature will make a difference in the readings you receive. It has been determined that to complete this
18 P Series SECTION 4. SERVICE AND MAINTENANCENOTE: Any servicing dealer attempting a warranty repair must have prior approval before conducting mai
19P SeriesFLUID VOLUME AND LEVELCertain situations may require additional uid to be added or even replaced. Refer to the vehicle manufa
20 P SeriesRETURN TO NEUTRAL SETTINGWARNINGPOTENTIAL FOR SERIOUS INJURY Inattention to proper safety, operation, or maintenance procedures could resul
21PC SeriesHOW TO USE THIS MANUALEach assembly is provided with an exploded viewshowing the parts involved. The itemreference numbers in each illustra
22 PC SeriesMiscellaneous 3/8-Inch Drive Ratchet and SocketsP Series Service & Repair Manual 7/16-inch SocketTorque Wrench 1/2-Inch SocketScribe,
23PC SeriesRefer to Figure 1.Prior to disassembly, note the position of the scissorarm brackets and the tab on the outer control armbracket.Disassembl
24 PC SeriesREMOVAL, INSPECTION AND/ORREPLACEMENT OF CONTROL ARMREMOVAL, INSPECTION AND/ORREPLACEMENT OF FAN ASSEMBLYRefer to Figure 3.Disassembly1. R
Table of ContentsSection PageDescription and Operation ...
25PC SeriesRefer to Figure 4.Disassembly1. Remove retaining ring (22) from housing.2. Remove lip seal (20). Care must be taken toprevent damage to th
26 PC SeriesRefer to Figure 6.Perform disassembly, inspection and assembly onshock valve one side at a time. Some units vary in“A” side to “B” side co
27PC SeriesRefer to Figure 8.Disassembly1. Prior to removal of the charge pump cover, placea mark on the cover and end cap for alignmentat assembly.2.
28 PC SeriesRefer to Figure 9.Disassembly1. Prior to removal of the auxiliary pump, place amark on the auxiliary pump (6), charge pump(7) and end cap
29PC SeriesRefer to Figure 10.Disassembly1. Remove charge pump. (See page 27).2. Using a 10 mm wrench, loosen the end cap bolts(4) evenly.3. Hold the
30 PC SeriesRefer to Figure 11.Disassembly1. Remove charge pump. (See page 27).2. Remove end cap. (See page 29).3. Tilt the pump on its side and drain
31PC SeriesRefer to Figure 12.Disassembly1. Remove the block spring (29).2. Remove the thrust bearing and races (34).Inspection1. Inspect and replace
32 PC SeriesRefer to Figure 14.Disassembly1. Remove the retaining ring (22).2. Remove the lip seal (20).3. Remove the spacer (21).3. Remove the shaft
33PC SeriesREMOVAL, INSPECTION ANDINSTALLATION OF TRUNNION ARMRefer to Figure 15.Disassembly1. Remove the slot guide (38).2. Remove and discard the tr
34 PC SeriesFigure 16. PC PumpBOXES INDICATE ITEMS INCLUDED IN KITS.Kit Number
P Series ivFOREWORDHeadquartered in Sullivan, Illinois, Hydro-Gearis a world leader in the design, manufacture, andservice of quality hydrostatic tran
35PC SeriesITEM LIST - PC SERIESPart numbers are not provided in this manual. See CD (BLN-51427) for part numbers.No. Description1 Housing Kit2 End Ca
36 PC Series
37PG / PE SeriesHOW TO USE THIS MANUALEach assembly is provided with an exploded view showing the parts involved. The item reference numb
38 PG / PE SeriesTOOLS AND TORQUESTable 1. Required ToolsTable 2. PG / PE Pump Torque ValuesMiscellaneousP Series Service & Repair ManualTorque Wr
39PG / PE SeriesPG AND PE SERIES PUMP REPAIRREMOVAL, INSPECTION AND/OR REPLACEMENT OF RETURN TO NEUTRAL ASSEMBLYFigure 1. PG / PE Pump Return to Neutr
40 PG / PE SeriesREMOVAL, INSPECTION AND/OR REPLACEMENT OF CONTROL ARMREMOVAL, INSPECTION AND/OR REPLACEMENT OF FAN ASSEMBLYRefer to Figure 3.Disassem
41PG / PE SeriesRefer to Figure 4.Disassembly1. Remove retaining ring (22) from housing.2. Remove lip seal (20). Care must be taken to prevent dam
42 PG / PE SeriesRefer to Figure 6.DisassemblyPerform disassembly, inspection and assembly on check valves one side at a time. Some units vary in “A”
43PG / PE SeriesRefer to Figure 8.Disassembly1. Loosen the bypass valve (15) using a 5/8” wrench.2. Remove the bypass (15) from the end cap (
44 PG / PE SeriesRefer to Figure 9.Disassembly1. Prior to removal of the charge pump cover, place a mark on the cover and end cap for alignment at as
45PG / PE SeriesRefer to Figure 10.Disassembly1. Prior to removal of the auxiliary pump, place a mark on the auxiliary pump, charge pump (7) and end
46 PG / PE SeriesRefer to Figure 11a and 11b.Disassembly1. Using a 10 mm wrench, loosen the end cap bolts (4) evenly.2. Keeping the end cap (2) hel
47PG / PE SeriesRefer to Figure 12.Disassembly1. Tilt the pump on its side, drain remaining oil. Lift out the cylinder block assembly (25).2. Remove
48 PG / PE SeriesRefer to Figure 13.Disassembly1. Remove the block spring (29).2. Remove the block thrust washer (30).3. Remove the thrust bearing
49PG / PE SeriesREMOVAL, INSPECTION AND ASSEMBLY OF INPUT SHAFTRefer to Figure 15.Disassembly1. Remove the retaining ring (22).2. Remove the lip sea
50 PG / PE SeriesRefer to Figure 16.Disassembly1. Remove the slot guide (38).2. Remove and discard the trunnion seal retainer and seal (49).3. Remo
51PG / PE Series
52 PG / PE SeriesFigure 17. PG / PE PumpBOXES INDICATE ITEMS INCLUDED IN KITS. Kit Number
53PG / PE SeriesITEM LIST - PG AND PE SERIESPart numbers are not provided in this manual. See CD (BLN-51427) for part numbers.No. Description1 Hou
54 PG / PE Series
1P SeriesIn some applications of the P Series Pumps, it is desirable to move the machine for short distances at low speeds without operating the engin
55PJ SeriesHOW TO USE THIS MANUALEach assembly is provided with an exploded viewshowing the parts involved. The itemreference numbers in each illustra
56 PJ SeriesTOOLS AND TORQUESTable 1. Required ToolsTable 2. PJ Pump Torque ValuesMiscellaneousP Series Service & Repair ManualTorque WrenchScribe
57PJ SeriesPJ SERIES PUMP REPAIRREMOVAL, INSPECTION AND/ORREPLACEMENT OF RETURN TONEUTRAL ASSEMBLYFigure 1. PJ Pump Return to NeutralRefer to Figure 1
58 PJ SeriesREMOVAL, INSPECTION AND/ORREPLACEMENT OF CONTROL ARMREMOVAL, INSPECTION AND/ORREPLACEMENT OF FAN ASSEMBLYRefer to Figure 3.Disassembly1. R
59PJ SeriesRefer to Figure 4.Disassembly1. Remove retaining ring (22) from housing.2. Remove lip seal (20). Care must be taken toprevent damage to th
60 PJ SeriesRefer to Figure 6.Perform disassembly, inspection and assembly oncheck valves one side at a time. Some units vary in“A” side to “B” side c
61PJ SeriesRefer to Figure 8.Disassembly1. Loosen the bypass valve (15) using a 5/8”wrench.2. Remove the bypass (15) from the end cap (2).Inspection1.
62 PJ SeriesRefer to Figure 9.Disassembly1. Prior to removal of the charge pump cover, placea mark on the cover and end cap for alignmentat assembly.2
63PJ SeriesRefer to Figure 10.Disassembly1. Prior to removal of the auxiliary pump, place amark on the auxiliary pump, charge pump (7)and end cap (2)
64 PJ SeriesRefer to Figure 11.Disassembly1. Remove charge pump. (See page 62).2. Using a 10 mm wrench, loosen the end cap bolts(4) evenly.3. Hold the
2 P SeriesEXTERNAL FEATURES - PC SERIESFigure 1. PC Pump with Standard Charge Pump
65PJ SeriesRefer to Figure 12.Disassembly1. Remove charge pump. (See page 62).2. Remove end cap. (See page 64).3. Tilt the pump on its side and drain
66 PJ Series1. Install thrust bearing and race assembly (34).2. Install the block thrust washer (30).3. Install block spring (29).Refer to Figure 13.
67PJ SeriesREMOVAL, INSPECTION ANDASSEMBLY OF INPUT SHAFTRefer to Figure 15.Disassembly1. Remove the retaining ring (22).2. Remove the lip seal (20).3
68 PJ SeriesRefer to Figure 16.Disassembly1. Remove the slot guide (38).2. Remove and discard the trunnion seal retainerand seal (49).3. Remove the tr
69PJ Series
70 PJ SeriesFigure 17. PJ PumpBOXES INDICATE ITEMS INCLUDED IN KITS.Kit Number
71PJ SeriesITEM LIST - PJ SERIESPart numbers are not provided in this manual. See CD (BLN-51427) for part numbers.No. Description1 Housing Kit2 End Ca
72 PJ Series
73PK SeriesHOW TO USE THIS MANUALEach assembly is provided with an exploded viewshowing the parts involved. The itemreference numbers in each illustra
74 PK SeriesTOOLS AND TORQUESTable 1. Required ToolsTable 2. PK Pump Torque ValuesMiscellaneousP Series Service & Repair ManualTorque WrenchScribe
3P SeriesFigure 2. PG Pump With Standard Charge Pump EXTERNAL FEATURES - PG SERIESSAE “A” PADFLANGE STYLECHARGEPRESSUREDIAGNOSTICPORTINPUT SHAFTINLET“
75PK SeriesRefer to Figure 1.Prior to disassembly, note the position of the scissorarm brackets and the tab on the outer control armbracket.Disassembl
76 PK SeriesREMOVAL, INSPECTION AND/ORREPLACEMENT OF CONTROL ARMREMOVAL, INSPECTION AND/ORREPLACEMENT OF FAN ASSEMBLYRefer to Figure 3.Disassembly1. R
77PK SeriesRefer to Figure 4.Disassembly1. Remove retaining ring (22) from housing.2. Remove lip seal (20). Care must be taken toprevent damage to th
78 PK SeriesRefer to Figure 6.Perform disassembly, inspection and assembly oncheck valves one side at a time. Some units vary in“A” side to “B” side c
79PK SeriesRefer to Figure 8.Disassembly1. Loosen the bypass valve (15) using a 5/8”wrench.2. Remove the bypass (15) from the end cap (2).Inspection1.
80 PK SeriesRefer to Figure 9.Disassembly1. Prior to removal of the charge pump cover, placea mark on the cover and end cap for alignmentat assembly.2
81PK SeriesRefer to Figure 10.Disassembly1. Prior to removal of the auxiliary pump, place amark on the auxiliary pump, charge pump (7)and end cap (2)
82 PK SeriesRefer to Figure 11.Disassembly1. Remove charge pump. (See page 62).2. Using a 10 mm wrench, loosen the end cap bolts(4) evenly.3. Hold the
83PK SeriesRefer to Figure 12.Disassembly1. Remove charge pump. (See page 80.2. Remove end cap. (See page 82).3. Tilt the pump on its side and drain r
84 PK Series1. Install thrust bearing and race assembly (34).2. Install the block thrust washer (30).3. Install block spring (29).Refer to Figure 13.
4 P SeriesEXTERNAL FEATURES - PJ SERIESFigure 3. PJ Pump with Standard Charge Pump
85PK SeriesREMOVAL, INSPECTION ANDASSEMBLY OF INPUT SHAFTRefer to Figure 15.Disassembly1. Remove the retaining ring (22).2. Remove the lip seal (20).3
86 PK SeriesRefer to Figure 16.Disassembly1. Remove the slot guide (38).2. Remove and discard the trunnion seal retainerand seal (49).3. Remove the tr
87PK Series
88 PK SeriesFigure 17. PK PumpBOXES INDICATE ITEMS INCLUDED IN KITS.Kit Number
89PK SeriesITEM LIST - PK SERIESPart numbers are not provided in this manual. See website for part numbers.No. Description1 Housing Kit2 End Cap Kit (
90 PK Series
91PR SeriesHOW TO USE THIS MANUALEach assembly is provided with an exploded view showing the parts involved. The item reference numbers i
92 PR SeriesTOOLS AND TORQUESTable 1. Required ToolsTable 2. PR Pump Torque ValuesMiscellaneousP Series Service & Repair ManualTorque WrenchScribe
93PR SeriesPrior to disassembly, note the position of the scis-sor arm brackets and the tab on the outer control arm bracket.See Figure 1.DisassemblyC
94 PR SeriesREMOVAL, INSPECTION AND/OR REPLACEMENT OF CONTROL ARMREMOVAL, INSPECTION AND/OR REPLACEMENT OF FAN ASSEMBLYRefer to Figure 3.Disassembly1.
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