Komatsu 930E-2 Shop Manual page 435

3. Move the steering pump into position. Engage
steering pump shaft with hoist pump spline cou-
pler.
4. Install rear support bracket with capscrews (6,
Figure 6-12). Do not tighten capscrews at this
time.
5. Align capscrew holes and install steering pump
mounting capscrews (4). Tighten mounting cap-
screws to standard torque. Tighten rear support
capscrews to standard torque.
6. Remove plugs from pump inlet and outlet ports.
Remove caps from inlet and outlet lines and install
to steering pump using new O-rings. Tighten cap-
screws securely. Do not connect steering pump
drain hose to the steering pump, at this time (see
Step 7).
7. Remove case drain fitting from top of pump hous-
ing and add clean C-4 oil to pump through
opening until steering pump housing is full.
This may require 2 - 3 qt. (2 - 3 L) of oil.
8. Uncap the case drain line, connect to steering
pump fitting and tighten case drain line.
9. Replace hydraulic filter elements. Refer to "Hy-
draulic Filters", Section L9.
NOTE: Use only Komatsu filter elements, or ele-
ments that meet the Komatsu hydraulic filtration
specification of Beta 12 = 200.
10. Open shut-off valve in steering pump suction line
completely.
11. With the body down and the engine shut-off, fill the
hydraulic tank with clean C-4 hydraulic fluid (as
specified on the truck Lubrication Chart) to the
upper sight glass level.
12. With suction line shut-off valve open, loosen suc-
tion (inlet) hose capscrews (at the pump) to bleed
any trapped air. Tighten hose connection cap-
screws to standard torque.
L06021
If trapped air is not bled from steering pump, pos-
sible pump damage and no output may result.
13. If required, top-off the oil level in the hydraulic tank,
to the level of the upper sight glass.
14. In the hydraulic components cabinet, open both
brake accumulator needle valves completely to
allow the steering pump to start under a reduced
load.
15. Move the hoist pilot control valve to the "Float"
position.
16. Start the truck engine and operate at low idle for
one (1) to two (2) minutes.
Do not allow the engine to run with the needle
valves in the open position for longer than this
recommendation: excessive hydraulic system
heating will occur.
DO NOT start any hydraulic pump for the first time
after an oil change, or pump replacement, with the
truck dump body raised.
Oil level in the hydraulic tank may be below the
level of the pump(s) causing extreme pump wear
during this initial pump start-up.
17. Shutdown the engine. Fully close both brake ac-
cumulator needle valves in the hydraulic compo-
nents cabinet.
18. Verify that the oil level in the hydraulic tank is at
the upper sight glass when the engine is off and
the body is resting on the frame. If the hydraulic
oil level is not at the upper sight glass, follow
service manual instructions for filling/adding oil.
19. Start engine and check for proper pump operation.
If necessary, refer to "Steering Circuit Checkout
Procedure", "Pressure Check and Adjustment
Procedure" in Section L10, or the "Trouble Shoot-
ing Chart" at the end of this section.
Steering Circuit Component Repair L6-13