JLG G12-55A Service Manual - Manual (Page 74)

Cab and Covers
4-4 G10-55A, G12-55A
b. Orbitrol Valve Installation
1. Secure steering valve to steering column with four
hex-flange capscrews and four lockwashers.
2. Install steering column through dash panel opening.
Position steering valve to its original orientation in
the cab.
3. Install the transmission control lever and connect the
lever
4. Install steering wheel assembly. Torque steering wheel
nut to 29–34 lb-ft (39–46 Nm).
5. Install new o-rings into the steering valve fittings.
Lubricate the o-rings with clean hydraulic oil.
6. Uncap and connect the previously labeled load
sense hose to the steering valve.
7. Uncap and connect the remaining previously labeled
four hoses to the steering valve.
Note: If necessary, install the main dash panel. Refer to
Section 9.12.1, “Gauges.”
8. Properly connect the batteries.
9. Start engine and check operation of steering system.
Check for hydraulic fluid leaks. Check hydraulic fluid
level in tank and add fluid as required.
10. Close and secure the engine cover.
11. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.
c. Steering Test
Conduct a pressure check of the steering hydraulic
circuits at the main control valve. Refer to Section 8.3.1,
“Pressure Checks and Adjustments.”
4.3.2 Service Brake Pedal
a. Brake Valve Removal
Refer to Section 8.7.3, “Service Brake Valve,” for
removal information.
b. Brake Valve Installation
Refer to Section 8.7.3, “Service Brake Valve,” for
installation information.
c. Service Brake Pedal Removal
1. Park machine on a firm, level surface, level machine,
fully retract boom, lower boom, place transmission
control lever in (N) NEUTRAL position, engage
parking brake and turn engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and steering wheel.
3. Open engine cover. Allow the system fluids to cool.
4. Properly disconnect the batteries.
5. Remove the bolt and lockwasher (1) securing the
service brake pedal pivot pin (2).
6. Pull pivot pin from service brake pedal bracket (3).
7. Remove the service brake pedal from the cab.
d. Service Brake Pedal Installation
1. Position the service brake pedal in its mounting
location within the cab.
2. Secure the brake pedal into position with the pivot pin.
3. Be sure the brake pedal has the correct range of motion.
Secure pivot pin with bolt and lockwasher.
4. Properly connect the batteries.
5. Close and secure the engine cover.
6. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.
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