ALTERNATOR AND WHEELMOTOR COOLING AIR FILTER SYSTEM
The cooling air for the alternator and wheelmotors
passes through a filter assembly prior to entering the
blower on rear of alternator. The filter housing is
mounted on the inlet of the air duct. The dirt removed
by the filter is drawn off each end of the filter housing
by a hydraulic motor driven blower and discharged to
atmosphere.
The hydraulic circuit for the evacuation fan consists of
the following:
•Main Hydraulic Reservoir
•Engine Driven Pump
•Remote Mounted Relief Valve
•Hydraulic Motor
•Supply and Return Piping
The pump is located at left rear of the engine. The relief
valve and fan motor are mounted on deck near the
control cabinet.
Oil from reservoir flows to inlet side of a gear type
pump. The outlet from the pump flows to a gear type
motor and direct acting relief valve. Oil flows through
the motor and returns to the main reservoir. The flow
is blocked at the remote mounted relief valve.
At engine high idle pump flow is approximately 12 GPM
(45 lpm). Maximum relief setting is 1000 ±50 psi
(7 ±.35 MPa).
SYSTEM ADJUSTMENT
Before opening blower drive hydraulic system, be
sure steering accumulators are completely bled
down. Turn steering wheel to check that accumu-
lators have bled down.
1. Install 0-2000 psi (0-14 MPa) gauge in tee where
motor supply line connects to line routed to relief
valve.
2. Remove line from tee to motor and plug.
3. Install cap on tee.
4. Loosen jam nut on circuit relief and back out relief
adjusting screw.
5. Start engine and slowly increase engine speed to
high idle while observing gauge.
There is no directional control valve in this circuit
to divert flow to tank. if gauge reading increases
rapidly, immediately shutdown engine.
6. With engine speed at high idle, slowly turn in relief
adjusting screw until 1000 ±50 psi (7 ±.35 MPa)
is observed on gauge. Tighten jam nut.
7. Return engine to idle speed and shutdown engine.
Be sure steering accumulators are bled down.
8. Remove gauge, install plug in tee. Connect supply
line to tee.
PUMP
Before removing hydraulic lines from pump, be
sure steering accumulators are completely bled
down. Turn steering wheel to check that accumu-
lators have bled down.
Removal
1. Disconnect lines from pump and cap to prevent
contamination.
2. Remove nuts from mounting studs and slide pump
from mount studs.
Disassembly
1. Clean pump before disassembly.
2. Remove nuts (16, Figure 4-2) and lockwashers (15)
from pump body studs (14).
3. Separate front cover (10) from center section (8).
4. Remove wear plate (9) and center section (8).
5. Remove gears (6 & 7) and wear plate (4) from rear
cover (1).
M04002 12/89 Alternator and Wheelmotor Cooling Air Filter System M4-1
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