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TM 55-1905-220-14-3
Table 3-21.
Hydrostarter - Cranking Cycle Too Short Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
Cranking cycle is too short.
Step 1.
Check for faulty pressure gage.
If gage is reading higher than actual system pressure, oil volume in the
accumulator will be less. Replace gage.
Step 2.
Check for excessive internal leakage in hydrostarter.
Refer to table 3-12.
Step 3.
Check for accumulator precharge too high.
With the fuel shut off to prevent engine from starting, crank the engine until all oil
is used. If the gage then registers zero pressure, install a gaging assembly on the
air valve and drop the precharge to 1250 psi (1695 kPa). Repeat cranking cycle. If
gage will still drop to zero at end of cranking cycle, reduce precharge to 1000 psi
(1356 kPa).
Step 4.
Check for accumulator precharge too low.
Open the bypass valve on the hand pump to discharge oil from the accumulator.
Install a gaging assembly on the accumulator 'air valve. If pre- charge is less than
1500 psi (2034 kPa), add nitrogen. Make sure precharge holds by testing for
nitrogen leakage. Refer to table 3-17.
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