Eaton 70160 Repair Information
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Eaton 70160 Repair Information

Variable displacement piston pump
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Model 70160 Variable Displacement Piston Pump
Repair Information
EN-801

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Summary of Contents for Eaton 70160

  • Page 1 Model 70160 Variable Displacement Piston Pump Repair Information EN-801...

  • Page 2: Table Of Contents

    Start-up Procedure ....................18 Introduction This manual provides service information for Eaton Models 70160 variable displacement piston 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: Identification

    5/16 in. and 7/16 Allen wrenches or bit sockets Internal and external retaining ring pliers Small screwdrivers (2) Hammer (soft face) Light Petroleum Jelly Seal driver or similar tool EATON Hydraulics 70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004...

  • Page 4: Parts Drawing

    Cover plate Press Fit Press Fit 51-1 Shaft assembly for single pump or front pump Port of tandem. (D2) Press Fit Shaft assembly for rear pump of tandem. EATON Hydraulics 70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004...
  • Page 5 55-4 55-3 49-1 55-5 K2-3 K1-1 (K2-2) 20-1 K2-3 K2-2 21-1 (K2-1) K4-3 (K3-3) K4-2 (K4-4) (K4-1) 34-1 (K3-2) (K3-1) 55-1 55-2 49-1 55-4 55-3 55-5 20-1 21-1 EATON Hydraulics 70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004...

  • Page 6: Parts List

    Ring, Crush O-ring, 2.38 mm Dia. x 66.68 mm I.D. [.0937 in. Dia. x 2.625 in. I.D.] Washer Mounting Bracket, Square shaped Mounting Bracket, "V" shaped Valve Plate EATON Hydraulics 70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004...
  • Page 7 O-ring, 1.59 mm Dia. x 101.6 mm ID. [.0625 in. Dia. x 4 in. ID.] K4-2 Washer K4-3 Cap Screws K4-4 9T Coupler Seal Repair Kit • Seal Repair Kit (see Parts Manual for part numbers) Legend Included in seal repair kit. EATON Hydraulics 70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004...

  • Page 8: Repair Information

    20.7 bar [200 to 300 PSI]) spring charge pump adapter. The needles in the needle bearing must and poppet is shown on the top. remain intact in the bearing cage. EATON Hydraulics 70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004...
  • Page 9 20 With the backplate removed, housing assembly (see Figure 24). remove the gasket from the pump housing assembly and discard (see Figure 19). EATON Hydraulics 70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004...
  • Page 10 Note: The camplate control shaft will fit out either side of the pump housing. Be sure to note on which side of the housing the control shaft protrudes before removing camplate from EATON Hydraulics 70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004...

  • Page 11: Reassembly

    16 The thrust plate is reversible. Either side will fit into the camplate. In most cases if any irregularities are noted it is best to replace the thrust plate (see Figure 46). EATON Hydraulics 70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004...
  • Page 12 The Model 70160 or 78162 variable displacement pump is now dowel pins located in the pump ready for test and reinstallation. housing. Use caution not to dislodge the valve plate (see Figure 54). EATON Hydraulics 70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004...

  • Page 13: Fault - Logic Troubleshooting

    System pressure gauge: 700 bar [10,000 PSI] Charge pressure gauge: 0 to 50 bar [0 to 600 PSI] Case pressure gauge: 0 to 25 bar [0 to 300 PSI] EATON Hydraulics 70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004...
  • Page 14 Replace Replace Replace Replace Inspect Pump Check Inspect Pump & Bypass Valve System Motor Motor (If used) Pressure High Defective Defective Repair Repair Reduce System Replace Replace Load EATON Hydraulics 70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004...
  • Page 15 Repair Replace Replace Replace Inspect Inspect Inspect Replace Charge Relief Inlet Screen Charge Pump & Valve or Filter Pump Motor Clogged Defective Defective Repair Repair Replace Replace Replace EATON Hydraulics 70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004...
  • Page 16 Repair Replace Replace Replace Inspect Replace Check Inspect Servo Control Pump & System Motor (If used) Motor Pressure Defective Defective High Repair Repair Reduce System Replace Replace Load EATON Hydraulics 70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004...
  • Page 17 EATON Hydraulics 70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004...

  • Page 18: Start-Up Procedure

    The charge pump should immediately pick up oil and fill the system. If there is no indication of fill in 30 seconds, stop the engine and determine the cause. EATON Hydraulics 70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004...
  • Page 19 Model 70160 Notes: EATON Hydraulics 70160 Variable Displacement Piston Pump Repair Information E-PUPI-TS005-E June 2004...
  • Page 20 Tel: 952 937-9800 Australia Tel: (49) 7221 682-0 Fax: 952 974-7722 Tel: (61) 3 9319 8222 Fax: (49) 7221 682-788 www.hydraulics.eaton.com Fax: (61) 3 9318 5714 © 2004 Eaton Corporation All Rights Reserved Printed in USA Document No. E-PUPI-TS005-E June 2004...

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