Hydraulic Section
8-46
31211015 6036, 6042, 8042, 10042, 10054
a. Steer Select Valve Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, raise the boom, place
the transmission 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. Temporarily block up or support the raised boom.
4. Open the engine cover. Allow the system fluids to cool.
5. Properly disconnect the battery. Refer Section 9.8,
“Battery”, for procedure.
6. Remove the transmission covers.
7. Label, disconnect and cap hydraulic hoses and electrical
plugs connected to steering select valve.
8. Remove the bolts holding the steer select valve to the
mounting plate on the frame.
9. Remove steer select valve from machine. Wipe up any
hydraulic fluid spillage in, on, near and around the
machine.
b. Steer Select Valve 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 spool from the steer
select housing.
4. Clean all the components with a suitable cleaner before
inspection.
5. Inspect the solenoids for proper operation. Check by
shifting the spool to ensure that it is functioning
properly. Check 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 fluid causes
failure of internal seals and damage to the polished
surfaces within the valve.
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 in the steer select housing.
8. Attach steer select valve to the manifold using four new,
oiled o-rings and four socket head capscrews.
c. Steer Select Valve Installation
1. Install the steer select valve to the mounting plate on
the frame using two capscrews.
2. Connect all the previously labeled hydraulic hoses,
fittings, solenoid wire terminal leads, etc., to the steer
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 hose clamps.
4. Properly connect the battery. Refer Section 9.8,
“Battery”, for procedure.
5. Remove the Do Not Operate Tags from both the ignition
key switch and the steering wheel.
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
fluid in the reservoir. Shut the engine OFF.
Note: Check for leaks and repair as required before continuing.
Add hydraulic fluid to the reservoir as needed.
8. Wipe up any hydraulic fluid spillage in, on, near and
around the machine, work area and tools.
9. Install the transmission covers.
10. Close and secure the engine cover.
d. Steering Test
Refer to Section 8.5.2, “Pressure Specifications”.
1. Conduct a pressure check of the steering
hydraulic circuit.
2. Check each steering mode for proper function.
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