Steering And Brake Pump; Steering Pump Removal - Komatsu 930E-2 Shop Manual

STEERING AND BRAKE PUMP

Removal
NOTE: Clean the steering pump and surrounding area
carefully to help avoid contamination of hydraulic oil
when lines are opened.
Relieve pressure before disconnecting hydraulic
and other lines. Tighten all connections before
applying pressure.
Hydraulic fluid escaping under pressure can have
sufficient force to enter a person's body by pene-
trating the skin and cause serious injury and pos-
sibly death if proper medical treatment by a
physician familiar with this injury is not received
immediately.
1. Perform normal truck shutdown procedure. Turn
keyswitch "Off" and allow 90 seconds for the
accumulators to bleed down. Turn the steering
wheel to be sure no oil remains under pressure.
NOTE: If oil in the hydraulic tank has not been con-
taminated, the shut-off valve between the tank and
FIGURE 6-12. STEERING PUMP REMOVAL
1. Hoist Pump Outlet Hoses
2. Pump Mount Capscrews
3. Hoist Pump
4. Pump Mount Capscrews
L6-12
5. Steering/Brake Pump
6. Pump Mount Bracket
7. Outlet To Filter
Steering Circuit Component Repair
steering pump can be closed, eliminating the need to
completely drain the tank.
2. Drain the hydraulic tank by use of the drain located
on the bottom side of the tank.
NOTE: Be prepared to contain approximately 250 gal.
(947 L) of hydraulic oil.
If the oil is to be reused, clean containers must be used
with a 3 micron filtering system available for refill.
3. Disconnect the suction line and outlet (7, Figure
6-12) at the steering pump (5). Disconnect and
cap pump case drain line from fitting at top of
pump housing. Plug all lines to prevent oil con-
tamination.
The steering pump weighs approximately 250 lbs
(113 kg). Use a suitable lifting device capable of
handling the load safely.
4. Support the steering pump and the rear section of
the hoist pump. Remove mounting capscrews
and rear support bracket (6). Remove the four
pump mounting capscrews (4).
5. Move the steering pump rearward to disengage
the drive coupler splines from the hoist pump (3)
and remove pump.
6. Clean exterior of steering pump.
7. Move the steering pump to a clean work area for
disassembly.
Installation
1. Install a new O-ring on pump mounting flange.
2. Make certain the steering pump splined coupler is
in place (inside hoist pump) prior to steering pump
installation.
The steering pump weighs approximately 250 lbs
(113 kg). Use a suitable lifting device capable of
handling the load safely.
L06021