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 TM 55-1905-222-14
b.
Hydraulic oil is stored at 3250 psi under the pressure of compressed nitrogen gas. When the engine start
pushbutton is engaged, the control valve opens. Fluid under pressure is forced out of the accumulator, by the expanding
nitrogen gas, and flows into the starting motor via the high pressure in-line filter and control valve. The starting motor
accelerates the engine to a high cranking speed. The used hydraulic oil returns directly to the reservoir
c.
The engine-driven recharging pump runs continuously during engine operation and automatically recharges
the accumulators. When the required pressure is attained in the accumulators, a valve within the pump body opens and
the hydraulic oil discharged by the pump is by-passed to the reservoir
d.
The accumulator blowdown valve is for blowing down the accumulators to relieve pressure before servicing
the system (refer to instruction on the front of ramp/starting system reservoir). There are two relief valves set at 3400 psi
to prevent the system from over-pressurization
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