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 TM 55-1905-219-14-4
3-48.
HYDROSTARTER PUMP (ENGINE-DRIVEN) - MAINTENANCE INSTRUCTIONS .
a.
The hydrostarter charging pump maintains a pressure of approximately 2900-3300 psi (19996 -
22754 kPa) in the accumulator. Do not drive pump at a speed over 2500 rpms. The pump body has an
unloading valve. The unloading valve by-passes the pump discharge to the reservoir once operating pressure
is reached. This allows the pump to work at a reduced load.
b.
The hydrostarter charging pump is a single-piston, positive displacement pump. The ball check
valves and the unloading valve are controlled by the accumulator pressure. The pump shaft is supported on
ball bearings and a seal. The pump is pressed into the bearing retainer to prevent leaks. The pump is attached
to the flywheel housing and is driven by a drive plate bolted to the camshaft.
This task covers:
a.
Inspection
b.
Removal
c.
Installation
INITIAL SETUP
Test Equipment
Reference
NONE
NONE
Equipment
Special Tools
Condition
Condition Description
NONE
NONE
Material/Parts
Special Environmental Conditions
Sealant (Permatex No. 2)
NONE
Masking tape
Personnel Required
General Safety Instructions
1
Observe WARNING in this procedure.
LOCATION
ITEM
ACTION
REMARKS
INSPECTION
1.
Engine
Charging
a.
Check for cracks, dents
pump
and wear.
assembly
b.
Check for leaks.
3-933
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