Hydraulic Checkout Procedure; Steering And Brake Pump - Komatsu 830E Shop Manual

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.
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. Shut down engine, turn keyswitch "Off" and
allow accumulator to completely bleed down
before opening circuits to take measurements,
to make repairs, or to install or remove gauges.
2. Install a calibrated 5000 psi (35,000 kPa) gauge
on the diagnostic coupling on the steering pump
test port marked "GPA", located on the same
side of the pump as the suction port.
3. 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 are not completely open when the engine is
started.
4. 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.
L10016 05/03

HYDRAULIC CHECKOUT PROCEDURE

Hydraulic Check-out Procedure
To Bleed Air From Pump:
a. With the engine "Off" and the hydraulic oil
level in the tank is at the proper level, open
shut-off valve in steering pump suction line.
b. With suction line shut-off valve open, loosen
suction hose capscrews (at the pump) to
bleed any trapped air. Then loosen pressure
hose capscrews (at the pump) to bleed any
trapped air. Tighten hose connection cap-
screws to standard torque.
NOTE: If trapped air is not bled from steering pump,
possible pump damage and no output may result.
c. Disconnect pump case drain hose (from fit-
ting 2, Figure 10-1) and cap the hose.
d. Remove fitting (2) and add clean C-4 type oil
to pump through opening until pump housing
is completely full.
e. When pump housing is full of oil, install fitting
(2) and connect pump case return hose to fit-
ting.
f. Check for proper oil level in hydraulic tank.
Add oil if necessary.
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
Adjuster
9. Jam Nut
10. Maximum Stroke
Screw
11. Unloader Adjuster
L10-1