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Eaton 1 Series Repair Information

Hydrostatic variable pumps
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Eaton
®
Hydrostatic Pumps
Repair Information
Series 1 Models 33-64
Hydrostatic Variable Pumps
No. 7-606
March, 1995

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  • Page 1 No. 7-606 Eaton ® March, 1995 Hydrostatic Pumps Repair Information Series 1 Models 33-64 Hydrostatic Variable Pumps...

  • Page 2: Table Of Contents

    Hydraulic Fluid Requirements ..................27 Introduction This manual provides service information for Eaton Models 33 thru 64 Variable Pumps. Step by step instructions for the complete disassembly, inspection and reassembly of the pump are given. The following recommendations should be followed to insure successful repairs: •...

  • Page 3: Id Tag

    31 = Fixed Displacement Motor 41 = Variable Displacement Motor Rotation 61 = Tandem Variable Displacement Pumps Eaton Corporation Hydraulics Division C - Identifies Specific Unit Configuration Spencer, Iowa 51301 D - Month of Manufacture E - Year of Manufacture...

  • Page 4: Exploded View Drawing And Part Names

    Exploded View Drawing CW Propel CW Standard Valve Plate Mounting Bolts Control Valve/ Port Plate for Slave Control Gasket(s) Gasket(s) Charge Pump Mounting Bolts...
  • Page 5 Models 33 thru 64 Variable Pump Parts Item Item Description Qty. Description Qty. Shaft Seal Kit O-ring ♦ O-ring Trunnion Shims O-ring Plug and O-ring Mounting Flange Bolt Pump Housing Shipping Strap Servo Piston S/A Mounting Flange S/A Retaining Ring Bearing Cup Dowel Pin O-ring...

  • Page 6: Disassembly

    Hydrostatic Variable Pump Repairs Disassembly Due to the complexity of the heavy duty pump certain Feedback subassemblies are disassembled, inspected, and Linkage reassembled upon removal from the pump. This procedure insures repair accuracy and helps avoid the loss of small parts. 1 Clean the exterior of the pump and drain the oil.
  • Page 7 Bolt (4) Check Valve Pulling Tool Dowel Pin (9) Gasket Check Valve Screw Driver Figure 3 Figure 4 11 Reposition the pump so the shaft is vertical and the 14 Pull the two check valves from the end cover; Hook charge pump is on top.
  • Page 8 Hydrostatic Variable Pump Repairs 16 Remove the end cover. Caution: The cylinder barrel spring pre-load will damage the pump’s internal parts if the end cover is removed incorrectly. Start by removing six of the eight bolts that hold the end cover to the pump.
  • Page 9 Input Input Rotation Rotation Bolt (12) Bearing Cup Gasket Metering Dowel Slots Figure 6 22 Remove the two dowel pins from cylinder barrel face, see figure 5. Servo Sleeve Servo Sleeve Retainer Figure 8 28 Reposition the pump so the control valve mount is O-rings on top.
  • Page 10 Hydrostatic Variable Pump Repairs 36 Repeat the following steps to remove each trunnion: Remove the three hex head bolts that hold the trunnion Retaining to the pump Rings The trunnion fits into the pump tightly; use a slide hammer to loosen it. Screw the slide hammer into the threaded hole in the trunnion.
  • Page 11 Critical Sealing Area Cylinder Low Clearance Barrel Bearing Puller Figure 12 40 Remove the shaft and bearing assembly from the swashplate and cylinder barrel. Keep the cylinder barrel and pistons together. Note: Do not remove the bearing cone from the shaft unless it is damaged.

  • Page 12: Reassembly

    Hydrostatic Variable Pump Repairs Reassembly Inspect the cylinder barrel, pistons, piston slippers, and Retaining thrust plate. Replace any worn or damaged parts. Strap Check all mating surfaces; replace any parts with scratches or burrs that could cause leakage. Inspect parts for excessive wear and replace as necessary. Wash all metal parts in clean solvent and blow them dry with compressed air.
  • Page 13 Bearing Cup 55 Install the second retaining strap and tighten all four Swashplate retaining strap bolts to 18 lb-ft [25 Nm]. Remove all excess Loctite. 56 Liberally lubricate the pistons slippers, thrust plate, Thrust Plate retainer plate, pistons, and cylinders. These parts must have sufficient start-up lubrication.
  • Page 14 Hydrostatic Variable Pump Repairs 62 After the bolts are torqued strike one of the trunnions to free up the swashplate’s movement. 63 Measure the swashplate breakaway force with a spring Strike the Trunnion to compression scale. Attach the Free-up Swashplate scale to the feedback linkage as Movement shown in figure 17.
  • Page 15 Shipping Strap Gasket Mounting Flange Bearing Parallel Bars Depth Micrometer Dowel Figure 21 71 Reposition the pump so the control valve mount is on Cross- top. Be careful do not let the cylinder barrel slide out off Section the pump. 72 Carefully slide the shaft and bearing assembly into the pump.
  • Page 16 Hydrostatic Variable Pump Repairs Temporarily Assemble Without Valve or Bearing Bearing Plates to Check Bearing Cone Driver Shaft End Play Shims Figure 23 81 Install two dowel pins in the holes in the end cover surface of the pump housing. 82 Install a new end cover gasket.
  • Page 17 Magnetic Base Dial Gauge Valve Plate Bearing Dowel Pins Plate Pliers Figure 24 Figure 25 Gently tap the shaft into the pump with a plastic hammer 84 Turn the pump over and remove the end cover. to seat the bearings. 85 Install two dowel pins in the holes in the cylinder Place a dial gauge, with a magnetic base over the shaft barrel face.
  • Page 18 Hydrostatic Variable Pump Repairs 93 Lubricate and install new o-rings and back-up rings on the check valves. The back-up ring must be installed on the charge pump side of the o-ring, see figure 27. 94 Install the check valves in the pump end cover. Push them down until their tops are flush with the surface of the end cover.
  • Page 19 Bolt (4) Feedback Charge Linkage Pump Control Valve Gasket Dowel Pin Gasket Figure 29 99 Reposition the pump so the control valve mount is on top. 100 Place a new control valve gasket on the pump. 101 Connect the feedback linkage and position the control valve on the pump.
  • Page 20 Note: Eaton recommends replacing the entire shaft Caution: Verifying the accuracy of repairs on an seal. Use Shaft Seal Kit P/N 990231. authorized test stand is essential.

  • Page 21: Appendix A: Ipor End Cover

    Appendix A: IPOR End Cover Plug and O-ring Plug and O-ring 9 lb-ft [12 Nm] 5 lb-ft [7 Nm] Plug and O-ring Feedback Pins 9 lb-ft [12 Nm] Override Spool Spring Spacer Shims Spring Box 60 lb-ft [81 Nm] Spring Control Orifice O-ring Figure 31...

  • Page 22: Appendix B: Power Limiter Valve End Cover

    Hydrostatic Variable Pump Repairs Appendix B: Power Limiter Valve End Cover Power Limiter Valve Spring O-ring O-ring Plug Plug 22 lb-ft [30 Nm] 11 lb-ft [15 Nm] Figure 32 After the end cover has been removed from the pump, Power Limiter Valve Pressure Setting disassemble it as shown in figure 32.

  • Page 23: Appendix C: Control Orifice Installation And Removal

    Appendix C: Control Orifice Installtion and Removal There are two types of control valve orifices: the plate orifice and the plug orifice. Control Valve Control Valve .180 in. .058 in. Deep Shallow Orifice Orifice Pocket Pocket O-ring Stake in 3 Places Plate Orifice Plug Orifice The plate orifice is used in control valves that have...

  • Page 24: Appendix D: Charge Pump Repair

    Hydrostatic Variable Pump Repairs Appendix D: Charge Pump Repair Charge Pressure Charge Pump Spacer Relief Vlave Displacement Thickness Drive (cu.in./rev) (inches) O-rings 1.28 1.70 Shaft Spacer Hollow Dowel (2) Charge Pump Body O-ring Cover O-ring Bolt (2) Gerotor Figure 33 Disassemble the charge pump by removing the two bolts Important: The charge pump’s rotation direction must that hold it together, as shown in figure 33.

  • Page 25: Appendix E: Special Tools

    Appendix E: Special Tools (All dimensions are given in inches.) Bearing Cone Drive Check Valve Puller Knurl 2.00 from end .12 X 45° Dia. .100 Dia. .300 .200 Model 33, 39, 46 1.01 1.25 Material - Steel 54, 64 1.25 1.48 Material / Heat Treatment;...
  • Page 26 Hydrostatic Variable Pump Repairs Stop Limit Tool Shaft End Spacer Mark with Center Punch .300 .350 Material - Steel Rotating Seal Puller .87 R Dia. Dia. 1.50 1.70 6.38 Dia. 5.00 Optional Dia. Material; SAE 1074 Reinforcement 6.00 Spring Steel 16 Ga. Model 33, 39, 46, 54, 64...

  • Page 27: Hydraulic Fluid Requirements

    Hydraulic Fluid Recommendations A reputable supplier can help you make the best selection of hydraulic fluid for use in Eaton hydrostatic products. For satisfactory operation the following recommendations apply: 1. The filter system used in the hydraulic circuit should be capable of cleaning and maintaining the hydraulic fluid to meet ISO Cleanliness Code 18/13 per SAE J1165.
  • Page 28 Telephone: 612/937-7254 Telephone: +44 (0) 1592-771-771 Telephone: +49 (0) 2102-406-830 manufactured in an Fax: 612/937-7130 Fax: +44 (0) 1592-773-184 Fax: +49 (0) 2102-406-800 ISO-9001-certified site. www.eatonhydraulics.com Copyright Eaton Corporation 1995 All Rights Reserved Form No. 7-606 Printed in USA March, 1995...

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