Komatsu 830E-AC Shop Manual page 702

STEERING CONTROL UNIT
Removal
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 penetrating the skin and
cause serious injury and possibly death if proper
medical treatment by a physician familiar with
this injury is not received immediately.
1. Turn the key switch OFF and allow 90 seconds
for the accumulators to bleed down. Turn steer-
ing wheel to ensure no oil remains under pres-
sure.
2. Remove cap screws and lockwashers securing
the steering control unit access cover in place
(Access cover is located on the front side of the
operator's cab.) Remove access cover.
NOTE: Clean the steering
surrounding area carefully
contamination of hydraulic oil when lines are opened.
3. Tag all hydraulic lines for proper identification
during installation. Disconnect hydraulic lines
(3, 4, 5, 6, & 7, Figure 5-11) at steering control
unit (2) ports and plug. Move lines clear of
valve.
4. Remove the four mounting cap screws, flat-
washers and lockwashers securing the steering
control unit to the mounting bracket. Remove
the steering control unit.
5. Place the steering control unit in a clean work
area for disassembly.
L5-18
control unit and
to help avoid
Steering Component Repair
Spline Inspection
Whenever the steering control unit is removed for
service, the steering column shaft should be
inspected for excessive wear.
1. Thoroughly clean splines on steering column
shaft and inspect for damage or excessive
wear.
2. Using an outside micrometer or dial caliper,
measure the outside diameter of the male
splines on the steering column shaft.
• Minimum diameter: 24.13 mm (0.950 in.)
If splines are worn more than the minimum diameter
specification, replace steering column. (Refer to Sec-
tion N.)
FIGURE 5-11. STEERING CONTROL UNIT
1. Brake valve
2. Steering Control Unit
3. "LS" Port Hose
4. "L" Port Hose
5. "T" Port Hose
6. "P" Port Hose
7. "R" Port Hose
L05035