Komatsu 830E-AC Shop Manual page 714

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.
L5-30
Disassembly
When disassembling or assembling unit, choose
a work area where no traces of dust, sand or
other abrasive particles which could damage the
unit are in the air. Do not work near welding,
sand-blasting, grinding benches and the like.
Place all parts on a CLEAN surface. To clean
parts which have been disassembled, it is impor-
tant CLEAN solvents are used. All tools and
gauges should be clean prior to working with
these units and new, CLEAN and threadless rags
used to handle and dry parts.
1. Drain off excess hydraulic oil from pump inlet
and discharge ports. It may be necessary to
loosen the four valve plate cap screws (20, Fig-
ure 5-26) pull back on valve plate to allow fluid
to seep out of the case.
2. Thoroughly clean and dry the outside surface of
the pump housing.
NOTE: Depending upon what part or parts are to be
inspected, it may not be necessary to completely
take apart all assemblies.
Control Piston Group
3. Remove the two large plugs (23, Figure 5-24)
with O-rings (15) from both sides of pump.
4. Back out four cap screws (3, Figure 5-26), then
remove cap (24). Remove bias control spring
(1, Figure 5-25).
5. Control piston (11, Figure 5-25) must be in the
"neutral" position. Control link pin (16) should be
centered in the plug opening. If pin is not cen-
tered, pry control piston to position link pin for
access through hole.
6. Using appropriate snap ring pliers, remove
retaining rings (14, Figure 5-25) from both sides
of the pin and remove control link washers (15).
Steering Component Repair L05035