JLG G5-18A Service Manual - Manual (Page 52)

Cab
4-4 G5-18A, 2505H, 25.5
4.4.2 Steering Column/Valve Replacement
a. Steering Column and Valve Removal
1. Park machine on a hard, level surface.
2. Fully retract boom, lower boom, place transmission
control lever in (N) NEUTRAL.
3. Engage park brake and shut engine OFF.
4. Place a Do Not Operate Tag on both ignition key
switch and steering wheel.
5. Properly disconnect battery.
6. Open engine cover. Allow system fluids to cool.
7. Remove steering wheel (4) (Refer to Section 4.4.1,
“Steering Wheel.”), transmission control lever (5) and
accessory lever (if equipped)(6).
8. Loosen and remove steering column cover.
9. Loosen and remove dash cover.
10. Label, disconnect and cap hydraulic hoses (7) and
fittings on steering orbitrol valve (8).
11. Remove four hex-flange capscrews (9) (three if
machine is equipped with tilt column) connecting
orbitrol valve to steering column.
12. Pull steering column assembly and orbitrol valve
from machine cab.
Note: DO NOT disassemble the steering orbitrol valve.
The steering orbitrol valve is not serviceable and must
be replaced in its entirety, if defective.
b. Steering Column and Valve Installation
1. Install four hex-flange capscrews (three if machine is
equipped with tilt column) through steering column,
mounting bracket and into top of orbitrol valve.
Note: ALWAYS use new o-rings when servicing
the machine.
2. Uncap and install new o-rings into fittings.
Lubricate o-rings with clean hydraulic oil.
3. Uncap and reconnect previously labeled hydraulic
hoses to their appropriate locations.
4. Install dash cover.
5. Install steering column cover.
6. Install steering wheel (Refer to Section 4.4.1,
“Steering Wheel.”), accessory lever and
transmission control lever.
7. Properly connect battery.
8. Carefully examine all connections one last time
before engine start-up. Rectify any faulty conditions.
9. Start engine and check operation of all controls.
Check for fluid leaks. Check hydraulic fluid level in
tank and add fluid as required.
10. Clean up all debris, hydraulic fluid, etc., in, on, near
and around the machine.
11. Close and secure engine cover.
12. Remove a Do Not Operate Tag on both ignition key
switch and steering wheel.
c. Power Steering Test
Conduct a pressure check of the steering hydraulic
circuits at the test port on the implement pump. Refer to
Section 8.6.5, “Steering Pressure Checking.”
MY2440
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