Komatsu 830E Shop Manual page 466

5. Align capscrew holes and install steering pump
mounting capscrews (4). Tighten mounting cap-
screws to standard torque and tighten rear sup-
port 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 capscrews 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 qts (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
"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 capscrews (at the pump) to
bleed any trapped air. Then loosen pressure
(outlet) 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.
L5-22
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.
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. Shut-off the engine and fully close both brake
accumulator needle valves in the brake 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 opera-
tion. If necessary, refer to "Steering Circuit
Checkout Procedure", later in this Section, or
the "Trouble Shooting Chart" or "Pressure
Check and Adjustment Procedure".
Steering Component Repair L05026