9-1
9. Hydrostatic and Aux. Pump
Disassembly and Assembly
Chapter Overview
This chapter provides disassembly and assembly
procedures for the hydrostatic and auxiliary pump.
Personal Safety
! WARNING !
Improper operation, lubrication, maintenance or repair
of this product can be dangerous and could result in
injury or death.
Do not operate or perform any lubrication, mainte-
nance or repair on this product until you have read
and understood the operation, lubrication, mainte-
nance and repair information.
Before starting any disassembly or assembly proce-
dures, refer to Chapter 2. Product Safety – Basic
Precautions for personal safety information.
Machine Preparation
! WARNING !
Accidental machine starting can cause injury or death
to personnel working on the machine.
To avoid accidental machine starting, disconnect the
battery cables from the battery and tape the battery
clamps and remove the key.
Place a “Do Not Operate” tag prominently on the ma-
chine to inform personnel that the machine is being
worked on.
Before starting any disassembly or assembly proce-
dures, refer to Chapter 2. Product Safety – Repair
for machine preparation information.
Preliminary Checkout
If troubleshooting is required prior to disassembly or
assembly, refer to Chapter 13. Troubleshooting.
Hydrostatic and Hydraulic
Pump Disassembly and As-
sembly Procedures
Disassembly and assembly procedures are provided
for the following transmission and drive components.
• Charge Pump
• Auxiliary Piston Pump
• Tandem Pump
Note: Procedures are provided for only those transmission
and drive components listed above. However, information
for removal and installation of other transmission and drive
components can be obtained from the Rubber Track
Loader Parts Manual.
Note: Refer to Figure 3-2 for an overview of the auxiliary
circuit system and Figure 3-3 for an overview of the drive
loop system.
Charge Pump Removal
The tools required for auxiliary gear pump removal
and installation are listed in Table 0-1. Use manufac-
turer-recommended tools whenever possible.
Table 0-1
Required Tools
Screwdriver
Combination Wrench
Socket Wrench
Charge Pump Removal
! WARNING !
Hot oil can cause personal injury. Lower all attach-
ments and make sure the oil is cool before removing
any components or lines.
Remove the oil filler cap only when the engine is
stopped and the filler cap is cool enough to touch
with your hands.
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General