10.13.12 Steering; Steer Select Switches - JLG sky trak mmv Service Manual

10.13.12 Steering

Certain steering functions are dependent upon electrical
operations, described below. Consult the Owners/Opera-
tors Manual for further information related to steering.
a. Steer Select Switches
The steer select switch (14) is located below and to the
right of the steering wheel column. It is a three-position
switch that is part of a stack of four switches that are
pressed or "snapped" into a rectangular mounting hole in
the dash.
15
16
14
The three-position switch (14) is a single-pole, double
throw toggle switch that has three positions (15, 16
and 17). It has a multiple-connector plug on its underside
that connects to the cab wiring harness. Wiring from the
plug connects the switch with power from the fuse panel
bus bar, and to the operator's display panel and the steer
select solenoids on the vehicle.
Steer select indicators on the right side of the operator's
display panel illuminate per the switch selected mode,
and the steer select solenoids are energized or de-ener-
gized accordingly to provide the type of steering selected.
The switch allows four-wheel steer (the rear wheels turn
opposite the front wheels), two-wheel steer (the front
wheels only), or crab steer (the rear wheels turn in the
same direction as the front wheels).
Model MMV Rev. 12/04
14
17
b. Steer Modes and Conditions
Four-Wheel Steer Mode
With the steer select switch (14) in the center
position (16), the following conditions must be met:
1. Four-wheel steer mode light (only) (18) must be
illuminated on the operator's display panel.
2. Front wheels (20) must steer in the direction that the
steering wheel is turned.
OM0800
3. Rear wheels (21) must steer in the opposite direction
from which the steering wheel is turned (refer to
Section 10.7.15, Four Wheel Steer Circuit and
Troubleshooting ).
Electrical System
19
18
20
21
MM2001
OS02802
10.157