64
22 - Steering System
Functional Description
The drive system on the SC6000 machine
consists of a single, steerable drive wheel
at the front of the machine Steering
control is made through the steering
column that passes through a universal
joint to translate the rotation from the
angled steering wheel to the vertical
shaft and pinion sprocket The pinion
sprocket drives a chain that wraps
around the steering disk The steering
disk has no chain teeth, but the chain is
fixed to the sprocket at the ends of the
chain using standard master links
Removal and Installation
Steering Wheel
Removing the steering wheel is a prerequisite procedure for completing
other procedures, such as replacing the paddle switches below the steering
wheel To complete the procedure, you will need a bolt-type wheel puller
with M6 bolts, such as shown to the right
1 Carefully pry up the steering wheel hub cover
(A)
2 Remove the steering wheel retaining nut
(B)
and washer
(C)
If you
have difficulty loosening the nut, you may need to use a low-power
impact driver
3 Position the wheel puller over the steering wheel hub and
thread the two bolts into the pulling holes in the hub Make
sure to thread the bolts in as far as you can, or at least 375
inches (10mm)
4 Align the wheel puller’s center bolt on the steering shaft
and hand tighten the center bolt until the puller stays in
position
5 Continue tightening the center bolt until the steering
wheel comes loose from the tapered steering shaft If the
wheel does not come loose easily, you can use a low-power
impact driver
6 As you slide the steering wheel off the shaft, watch for
the woodruff key
(E)
so it does not get lost Unless the
woodruff key is firmly stuck in the steering shaft, it is best
to remove it and set it aside
Replacement Notes
1 During replacement, make sure the woodruff key is in the steering shaft keyway, and align the steering
wheel’s keyway with the woodruff key
2 Torque the steering nut
(B)
to 38-42 lb
•
ft (51-57 N
•
m) Do not use an impact driver to reinstall the nut
Wheel
Motor
Steering Disk
& Chain
Drive
Controller
U-Joint
A
B
C
D
E
F