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COMPONENT DESCRIPTION
Hydraulic Tank
The hydraulic tank supplies hydraulic oil for the hoist,
steering, and brake circuits. The tank is located on
the left hand frame rail forward of the rear wheels.
The service capacity is 901 l (238 gal). Refer to Sec-
tion P for the correct type hydraulic oil recommended
for use in the hydraulic system.
Oil used in the hoist circuit flows through two 100
mesh wire suction strainers to the inlet housing of the
hoist pump. Air drawn into the tank during operation
is filtered by dual air filters located on the top of the
tank. Oil level can be checked visually at sight
glasses located on the face of the tank. Oil level
should be checked periodically and be visible in the
bottom sight glass when the body is down and the
engine is running.
Hoist Pump
The hoist pump is a tandem gear type pump driven
by an accessory drive at the rear of the traction alter-
nator. The pump has a total output of 908 lpm (240
gpm) at 1900 RPM. The hoist pump also drives the
steering and brake supply pump located at the rear
of the hoist pump. Hoist pump output is directed to
two remote mounted high pressure filters. Maximum
hoist pump output pressure is 17237 kPa (2500 psi).
L7-4
FIGURE 7-2. HOIST PUMP/VALVE MODULE
Hoist Circuit
High Pressure Filters
Hoist pump output flows to two remote mounted high
pressure filters located on the lower inboard side of
the fuel tank. The filter elements are rated at 7
micron. The filter assembly is equipped with a
bypass valve which permits oil flow if the filter ele-
ment become plugged. Flow restriction through the
filter element is sensed by a pressure differential
switch.
This switch will turn on an over-
head panel mounted, yellow
warning light to indicate filter
service is required. The light is
labeled "Filter Monitor" and will
come
on
when
restriction
reaches approximately 241 kPa
(35 psi). Actual filter bypass will
result when the filter element
restriction
reaches
approxi-
mately 345 kPa (50 psi).
1. POWER DOWN Line
2. Hoist Valve Assembly
3. DOWN Pilot port
4. Hoist Valve Return to Tank
5. Hoist Valve Inlet from Filter
6. Supply to Pilot Valve
7. RAISE Pilot Port
8. Pump/Valve Module Mount Str.
9. POWER UP Line
10. POWER DOWN to Hoist Cylinder
11. POWER UP to Hoist Cylinder
12. Counterbalance Valve Manifold
13. Counterbalance Valve
14. APU Quick Disconnect
L07034
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