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 TM 55-1905-220-14-4
3-48. HYDROSTARTER PUMP (ENGINE-DRIVEN) - MAINTENENCE INSTRUCTIONS.
a. The hydrostarter charging pump maintains a pressure of approximately 2900-3300 psi (1996 22754 kPa)
in the accumulator. Do not drive pump at a speed over 2500 RPMs. The pump body has an unloading valve
which 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 all WARNINGS in this
procedure.
LOCATION
ITEM
ACTION
REMARKS
INSPECTION
1. Engine
Charging
a. Check for cracks,
pump as-
dents, and wear.
sembly
b. Check for leaks.
3-913
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