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 TM 55-1925-273-10-1
0045 00
Table 19. Towing Machine Hydraulic System (refer to figure 19)
Key
Control/Indicator
Function
1
CH-26, DRN CUT-OUT
This valve cuts out drain flow to the tow winch hydraulic reservoir from the
TOW WN HYDR Valve
central hydraulic system.
2
Filter Restriction Gauge
This gauge indicates the condition of the return filter. GREEN indicates a
good filter and RED indicates a need to change the filter.
3
Pump Output Pressure Gauge
This gauge indicates the hydraulic pump output pressure.
4
Load Sense Pressure Gauge
This gauge indicates the load sense pressure in the system.
5
Unloading Pressure Gauge
This gauge indicates the unloading pressure of the pump.
6
TH-4, DRAIN CRSVR.
This valve secures the drain crossover line between the towing hydraulic
TO CENT. HYD Valve
and central hydraulic systems.
7
TH-3, RETURN CRSVR.
This valve secures the return crossover line between the towing hydraulic
TO CENT. HYD Valve
and central hydraulic systems.
8
CH-27, RTN CUT-OUT
The valve cuts out the return line to the tow winch hydraulic reservoir from
TOW WN HYDR Valve
the central hydraulic system.
9
GS-75, TOW WN HYD
This valve secures the flow of raw water into the tow winch hydraulic oil
OIL CLR SPLY Valve
cooler.
10
Fill Connector
This permits pressurized filling of the tow winch hydraulic reservoir through
a hydraulic oil filter.
11
GS-77, HYD OIL CLR
This valve secures the flow of raw water out of the tow winch hydraulic oil
DISCH Valve
cooler.
12
Sight Glass
The sight glass indicates the hydraulic oil level in the reservoir.
13
TH-2, PRESS CRSVR CTL
When OPEN, this valve permits the tow winch hydraulic system to power
HYDR TOW WN HYDR Valve
the central hydraulic system's components.
14
TH-13, FLOW CONTROL
This valve secures the pressure to the hydraulic pressure gauge.
Valve
15
TH-14, FLOW CONTROL
When OPEN, this valve permits the tow winch hydraulic pump to draw
Valve
suction from the tow winch hydraulic reservoir.
16
TH-1, C.O.V.-PMP DISCH.
This valve secures the discharge line from the tow winch hydraulic pump to
TO TOW WN. HYD Valve
the tow winch hydraulic system.
17
TH-12, FLOW CONTROL
This valve secures the pressure to the pump output pressure gauge (figure 3,
Valve
item 3).
0045 00-27
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