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STEERING AND BRAKE PUMP
Pressure Check And Adjustment Procedure
NOTE: If steering and brake pump has just been
installed, make sure the steering pump crankcase is
full of oil prior to starting the engine (See Step 5).
Relieve pressure before disconnecting hydraulic
lines. Tighten all connections securely before
applying pressure.
Hydraulic fluid escaping under pressure can
have sufficient force to enter a person's body by
penetrating the skin and cause serious injury and
possibly death if proper medical treatment by a
physician familiar with this type of injury is not
received immediately.
Blocking pressure line between pump and sys-
tem (or pump) high pressure relief valve will
result in damage and could result in serious per-
sonal injury.
1. Place the directional control lever in PARK.
Turn the key switch OFF to stop the engine and
allow accumulator to completely bleed down
before opening circuits to take measurements,
to make repairs, or to install or remove gauges.
NOTE: All accumulators must be fully precharged
with nitrogen before starting engine. Permanent
damage to bladder accumulators will result if engine
is started without proper precharge.
2. Check nitrogen precharge in all accumulators.
Refer to Steering Accumulator Charging Proce-
dure, this section, and Brake Accumulator
Charging Procedure, Section J, Brake Circuit
for detailed charging instructions.
L10028
HYDRAULIC CHECKOUT PROCEDURE
Hydraulic Check-out Procedure
3. Install a calibrated 35,000 kPa (5000 psi) gauge
on the diagnostic coupling on the steering pump
test port marked "GPA" (5, Figure 10-1), located
on the same side of the pump as the suction
port.
4. Make sure all pump suction line shut-off valves
are fully open. (The shut-off valves are open
when the handles are in line with the hose.)
NOTE: Serious pump damage will result if all shut-off
valves in the suction lines are not completely open
when the engine is started.
5. If the pump has just been installed on the
machine, and prior to starting the engine, bleed
air from inside pump to make sure the steering
pump crankcase is full of oil.
FIGURE 10-1. STEERING PUMP
1. Steering Pump
2. Pump Crankcase Drain
Fitting
3. Inlet Port
4. Plug
5. Diagnostic Port (GPA)
6. Compensator Housing
7. Jam Nut
8. Compensator Adjus
9. Jam Nut
10. Maximum Stroke
Screw
11. Unloader Adjuster
L10-3
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