| Tweet |
Custom Search
|
|
|
||
 TM 55-1905-242-14
0006 00
Reservoir
The propulsion engine hydraulic starting system shares a partitioned reservoir with the bilge/ramp/crane system mounted on
bulkhead 39, centerline, in the engine room. The propulsion engine hydraulic starting system uses the port side of the
reservoir, which is completely isolated from the starboard side of the reservoir. There is no intermingling of hydraulic oil
within the reservoir. Each side of the reservoir has its own fill and its own level indicator.
The reservoir is used to store hydraulic oil for use in the propulsion engine starting system. A sufficient volume of oil is
stored to allow normal operation of the system. In addition, the oil volume is large enough to allow the oil to remain in the
reservoir, where it may be cooled by ambient air circulation.
Engine-Driven Hydraulic Pump
Each propulsion engine is equipped with a hydraulic pump that runs continuously during engine operation. The pumps
automatically recharge the accumulators. When the required pressure is attained in the accumulators, a valve within the
pump body opens, and the hydraulic oil is circulated back to the reservoir. Depending upon the position of the isolation
valve, a single pump can charge one or both pairs of accumulators.
Hand Charging Pump
A hand charging pump is provided to permit charging of the hydraulic accumulators when the propulsion engines are not
running. This pump is used when the accumulators have been blown down for service, when repeated failed starting
attempts leave the accumulators depleted, or when the accumulators have otherwise lost their charge.
Accumulators
Two pairs of hydraulic accumulators store hydraulic pressure for later use. The accumulators are mounted on bulkhead 39,
one pair on each side of the reservoir. The accumulators use dry nitrogen gas to maintain the charge pressure. They may be
recharged with either the engine-driven hydraulic pump(s) or with the hand charging pump. Under normal operating
conditions, the starboard accumulators power the starboard starting motor, and the port accumulators power the port
starting motor. System operating pressure is 3250 lb/in (221.0 bar)
Control Valve
Each propulsion engine has a solenoid-actuated control valve that controls the flow of hydraulic oil to the hydraulic starting
motors. The valve is closed in its resting state. When actuated, the control valve allows hydraulic oil under pressure to flow
to the hydraulic starting motor. Under normal conditions, the control valve is actuated when the operator presses the
pushbutton engine starting switch in the pilothouse. Under unusual conditions, the control valve may be manually actuated
by pressing the manual start button on the valve.
MANUAL
START
BUTTON
INLINE
FILTER
CONTROL
VALVE
0006 00-2
|
||
|
||
