JLG G5-18A Service Manual - Manual (Page 109)

8-19 G5-18A, 2505H, 25.5
Hydraulic System
c. Pilot Select Valve Installation
1. Attach the pilot select manifold valve to the mounting
plate on the frame using the socket head capscrews.
2. Connect the hydraulic hoses, fittings, solenoid wire
terminal leads, etc., to the pilot select valve.
3. Check the routing of all hoses, wiring and tubing for
sharp bends or interference with any rotating
members, and install tie wraps and/or protective
conduit as required. Tighten all tube and hose clamps.
4. Properly connect the battery.
5. Start the engine and run at approximately 1/3-1/2
throttle for about one minute, without moving the
machine or operating any hydraulic functions.
6. Inspect for leaks and check the level of the hydraulic
fluid in the reservoir. Shut the engine OFF.
7. Wipe up any hydraulic fluid spillage in, on, near and
around the machine, work area and tools.
8. Close and secure the battery and engine covers.
9. Remove the Do Not Operate Tags from both the
ignition key and the steering wheel.
d. Pilot Select Valve Test
1. Check boom lift/lower, auxiliary and tilt for proper
function.
2. If further troubleshooting is required, refer to Section
8.7, “Hydraulic Schematic,” or Section 9.4, “Electrical
System Schematics,” for details.
8.11.7 Inching Valve
The inching valve is attached at the front of the frame
directly above the steer select valve.
Verify the correct operation of the inching valve before
considering replacement of the valve. The housing of the
inching valve is not serviceable and must be replaced if
defective.
a. Inching Valve Removal
1. Park the machine on a firm, level surface, fully
retract the boom, lower the boom, place the
transmission control lever in (N) NEUTRAL, engage
the park brake and shut the engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel, stating that the
machine should not be operated.
3. Open the battery and engine covers. Allow the
system fluids to cool.
4. Properly disconnect the battery.
5. Label or otherwise mark the hydraulic hoses in
relation to the inching valve. Disconnect and cap all
hoses, fittings, etc.
6. Remove the capscrews that attach the valve to the
frame.
7. Remove the inching valve from the machine. Wipe
up any hydraulic fluid spillage in, on, near and
around the machine.
b. Inching Valve Disassembly, Cleaning, Inspection
and Assembly
1. Place the inching valve assembly on a suitable work
surface.
2. Remove the cartridge (1) from the inching valve
housing.
3. Clean all components with a suitable cleaner before
inspection.
MY2330
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