Komatsu 830E-AC Shop Manual page 977

STEERING COLUMN
Removal
1. Shut down engine by turning the key switch
OFF and allow at least 90 seconds for the steer-
ing accumulators to bleed down. Turn the steer-
ing wheel to be certain no pressure remains.
2. Open the battery disconnect switch.
3. Remove the access cover (15, Figure 5-3) from
the front of the cab. If steering control unit is
OK, do not disconnect any hydraulic lines.
4. Loosen cap screws (10) on steering control unit
(7) and move it out of the way.
5. Disconnect wire harness(s) from the steering
column.
6. Remove screws retaining trim cover (14) where
steering column enters the instrument panel
and remove cover.
7. Remove four cap screws (4). Access to these
screws is from the front of the cab through the
access opening. Also remove cap screws (12).
8. Lift the steering column out of the instrument
panel.
9.
FIGURE 5-3. STEERING COLUMN INSTALLATIO
1. Steering Wheel
2. Button Horn
3. Steering Column
4. Cap Screw
5. Flat Washer
6. Lock Washer
7. Steering Control Unit
8. Bracket L.H.
N05070 10/06
9. Bracket R.H.
10. Cap Screw
11. Lock Washer
12. Cap Screw
13. Nut
14. Trim Cover
15. Access Cover
Operator Controls
Steering Column Inspection
Whenever the steering column or steering control
unit is removed for service, the steering column shaft
splines should be inspected for excessive wear.
1. With steering column assembly removed from
truck, thoroughly clean splines on steering col-
umn 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.)
3. If splines are smaller than minimum diameter
specification, replace steering column.
Installation
1. Insert cap screw (10) with lockwashers (11) and
flatwashers (5) through brackets (8 & 9) and
then through steering column flange. Add sec-
ond flat washer (5) and nut (13) to each cap
screw to hold parts together. Tighten nuts
securely.
2. Slide the entire assembly down the tapered
blocks until the brackets (8 & 9) contact the
mounting surface in the cab. Install cap screws
(4) and (12) with washers (5) and (6). Only
tighten cap screws (4).
3. Inspect brackets (8 & 9) to see if they contact
the mounting surface evenly, and are flat and
inline with the surface. If so, then tighten cap
screws (12). If brackets are not quite parallel,
then install flat washers (as needed) between
brackets and mounting surface to eliminate any
gaps. Tighten cap screws (12) to standard
torque.
4. After cap screws (4 & 12) are tightened to stan-
dard torque, remove nuts (13) and flatwashers
(5) that were holding the steering column to the
two brackets. Do not remove cap screws (10)
from the brackets.
5. Lubricate the male splines on the end of the
steering column shaft.
Note: There is no lower end bearing in this new
steering column assembly, therefore the male end of
the shaft will have to be guided into the mating
female part of the steering control unit (7).
6. Without removing cap screws (10) from the
holes, move the steering control unit (7) into
place and start each of the cap screws.
N5-5