JLG 4017 Service Manual - Manual (Page 55)

4.3 4017
Cab and Covers
4.2 OPERATOR’S CAB
4.2.1 Cab Safety
4.2.2 Serial Number Decal
The cab serial number decal is located on the left side of
the cab, behind the seat. Information specified on the
serial number plate includes the cab model number, the
cab serial number and other data. Write this information
down in a convenient location to use in cab
correspondence.
4.3 CAB COMPONENTS
4.3.1 Steering Column and Orbitrol Valve
a. Orbitrol Valve Removal
1. Park the machine on a firm, level surface, fully
retract the boom, lower the boom, place the
transmission control lever in the (N) NEUTRAL
position, engage the park brake and turn the engine
OFF.
2. Place an Accident Prevention Tag on the ignition key
switch, stating that the machine should not be
operated.
3. Open the engine cover. Allow the system fluids to
cool.
4. Remove the battery negative (-) cable from the
battery negative terminal.
5. Remove the lower dash panel.
6. Label, disconnect and cap the four hoses (1) from
the side of the steering valve (2). Cap the fittings on
the steering valve. Label, disconnect and plug the
load sense hose (3) at the front of the steering valve.
Cap the fitting on the steering valve.
7. Remove the steering wheel (4), disconnect and
remove the display panel (5), disconnect and
remove the accessory lever (6) and transmission
control lever (7), loosen and remove the locking bolt
(8) for the steering column adjustment, loosen and
remove both steering column pivot bolts and nuts.
8. Remove the steering assembly (9) through the dash
panel opening.
9. Support the steering valve, and remove the four hex-
head capscrews and four lockwashers.
Note: DO NOT disassemble the orbitrol valve. The
orbitrol valve is not serviceable and must be replaced in
its entirety, if defective.
b. Orbitrol Valve Installation
1. Secure the steering valve to the steering column
with four hex-flange capscrews and four
lockwashers. Torque capscrews to 18 Nm (13 lb-ft).
2. Install the steering valve through the dash panel
opening. Position steering valve in the cab, with the
“LS” port pointing forward (away from the operator).
3. Install both steering column pivot bolts and nuts, install
the locking bolt for the steering column adjustment,
install the accessory lever and transmission control
lever and connect the harness connector, install the
display panel and connect the harness connector,
install the steering wheel assembly. Torque the steering
wheel nut to
25 Nm (18 lb-ft).
WARNING:
The protection offered by
this ROPS/FOPS will be impaired if subjected
to any modification or structural damage, at
which time replacement is necessary. ROPS/
FOPS must be properly installed using
fasteners of correct size and grade, and
torqued to their specified value.
MZ0620
2
9
6
7
5
8
1
3
4