JLG 4013PS Service Manual - Manual (Page 134)

Hydraulic System
8-24 3508PS, 3509PS, 3512PS, 3513PS, 4008PS, 4009PS, 4012PS, 4013PS, 4017PS, 40.8, 40.9
7. Remove the two bolts holding the steer select valve
to the mounting plate on the frame.
8. Remove the steer select manifold with the attached
steer select valve (9) from the machine. Wipe up any
hydraulic oil spillage in, on, near and around the
machine.
b. Steer Select Valve and Manifold Disassembly,
Cleaning, Inspection and Assembly
1. Place the steer select assembly on a suitable work
surface.
2. Separate the steer select valve from the manifold by
removing the four socket head capscrews. Discard
the four o-rings.
3. Remove the solenoid valves and cartridges from the
steer select housing.
4. Clean all components with a suitable cleaner before
inspection.
5. Inspect the solenoid cartridges for proper operation.
Check by shifting the spool to ensure that it is
functioning properly. Check that the spring is intact.
Inspect the cartridge interior for contamination.
6. Inspect internal passageways of the steer select
manifold and valve for wear, damage, etc. If inner
surfaces of the manifold DO NOT display an ultra-
smooth, polished finish, or components are
damaged in any way, replace the manifold or
appropriate part. Often, dirty hydraulic oil causes
failure of internal seals and damage to the polished
surfaces within the secondary function manifold.
Note: ALWAYS replace seals, o-rings, gaskets, etc.,
with new parts to help ensure proper sealing and
operation. Lubricate seals and o-rings with clean
hydraulic oil.
7. Install the solenoid valves and cartridges in the steer
select housing.
8. Attach the steer select valve to the manifold using
four new, oiled o-rings and the four socket head
capscrews.
c. Steer Select Manifold and Valve Installation
1. Install the steer select valve to the mounting plate
under the left side of the frame using the previously
used hardware.
2. Uncap and connect the previously labeled hydraulic
hoses and fittings to the steer select valve.
3. Connect all previously labeled wire terminal leads to
the steer select valve.
4. 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 hose clamps.
5. Properly connect the battery.
6. 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.
7. Inspect for leaks and check the level of the hydraulic
oil in the reservoir.
Note: Check for leaks and repair as required before
continuing. Add hydraulic oil to the reservoir as needed.
8. Check each steering mode for proper function.
9. Wipe up any hydraulic oil spillage in, on, near and
around the machine, work area and tools.
10. Close and secure the engine cover.
11. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.
8.9.6 Leveling Valve
a. Leveling 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.
MZ0380
9
17M Frame Shown