Komatsu 830E-AC Shop Manual page 713

Installation
1. Install a new O-ring on pump mounting flange.
2. Make sure the steering pump spline coupler is
in place (inside hoist pump) prior to steering
pump installation.
The steering pump weighs approximately 113
kgs (250 lbs). Use a suitable lifting device capa-
ble of handling the load safely.
3. Move the steering pump (5, Figure 5-23) into
position. Engage steering pump shaft with hoist
pump spline coupler.
4. Install rear support bracket (7) with cap screws.
Do not tighten cap screws at this time.
5. Align cap screw holes and install steering pump
mounting cap screws (4). Tighten mounting cap
screws to standard torque and tighten rear sup-
port cap screws 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). Cap the drain hose
securely.
7. Remove case drain fitting from top of pump
housing and add clean C-4 oil to pump through
opening until steering pump housing is full. This
may require 2 - 3 l (2 - 3 qts) of oil.
8. Uncap the case drain line, connect to steering
pump fitting and tighten case drain line.
L05035
9. Replace hydraulic filter elements. Refer to
Hydraulic Filters earlier in this section.
NOTE: Use only Komatsu filter elements, or
elements 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
suction (inlet) hose cap screws (at the pump) to
bleed any trapped air. Then loosen pressure
(outlet) hose cap screws (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.
13. If required, top-off the oil level in the hydraulic
tank, to the level of the upper sight glass.
14. In the hydraulic brake 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.
Steering Component Repair L5-29