Eaton 70523 - Introduction

2
Model 70523
Table of Contents
Introduction.........................................................................................................2
Identification........................................................................................................3
Tools Required ....................................................................................................3
Parts Drawing......................................................................................................4
Parts List .............................................................................................................5 - 12
Item 1 - Drive Shaft ID ..................................................................................6
item 2 - Backplate Assembly .........................................................................7
Item 4 - Compensator Assembly and Parts List ............................................8 - 9
Factory Pre-set Compensator Assemblies .....................................................9
Item 3 - Housing Identification ......................................................................10
Item 5 - Rotating Kit ......................................................................................10
Mounting Kits................................................................................................11
Product Number............................................................................................12
Repair information...............................................................................................13 - 15
Disassembly ..................................................................................................13
Inspection .....................................................................................................14
Reassembly...................................................................................................14 - 15
Start-up Procedure ..............................................................................................16
Fault - Logic Troubleshooting..............................................................................17 - 19
Introduction
This manual provides service information for the Eaton Models 70523 Pressure or Pressure - Flow
Compensated 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.
Remove the pump from the application.
Cleanliness is extremely important.
Clean the port areas thoroughly before disconnecting the hydraulic lines.
Plug the pump ports and cover the open hydraulic lines immediately after they're disconnected.
Drain the oil and clean the exterior of the pump before making repairs.
Wash all metal parts in clean solvent.
Use compressed air to dry the parts. Do not wipe them dry with paper towels or cloth.
The compressed air should be filtered and moisture free.
Always use new seals when reassembling hydraulic pumps.
Lubricate the new rubber seals with a petroleum jelly (Vaseline) before installation.
Torque all bolts over gasketed joints, then repeat the torquing sequence to make-up for gasket
compression.
Verifying the accuracy of pump repairs on an authorized test stand is essential.
Introduction