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 TM 55-1905-220-14-7
3-178. 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 resevoir 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
Personnel Required
General Safety Instructions
1
Observe WARNINGS in this procedure.
3-3018
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