JLG sky trak mmv Service Manual page 423

5. Label or otherwise mark the hydraulic hoses (2)
connected to the power steering valve (3).
Disconnect the hoses and cap all hoses, fittings, etc.
Wipe up any hydraulic fluid spillage.
6. Refer to Section 3.5.1, Steering Wheel, Column and
Shifter, for information on removing the steering
column. The steering column and power steering
valve are mounted together. DO NOT attempt to
disassemble the steering valve.
b. Power Steering Valve Installation
Note: ALWAYS replace seals, o-rings, gaskets, etc.,
with new parts to help ensure proper sealing and opera-
tion. Lubricate seals and o-rings with clean hydraulic oil.
1. Install the steering column, connecting it to the
power steering valve.
2. Connect all the hydraulic hoses (2) to the power
steering 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.
Model MMV Rev. 12/04
Note: Check for leaks and repair as required before
continuing. Add hydraulic fluid to the reservoir as
needed.
3
c. Power Steering Test
Conduct a pressure check of the steering hydraulic cir-
2
cuits at the accumulator charge valve. Refer to Section
9.7, Hydraulic System Testing .
MM4680
WARNING:
operation in closed areas with inadequate ven-
tilation. Failure to properly ventilate exhaust
fumes can result in death or serious injury.
4. Start the engine and run at approximately 1/3-1/2
throttle for about one minute without moving the
vehicle or operating any hydraulic functions.
WARNING:
under pressure can penetrate the skin and
cause severe personal injury. DO NOT use
your hand or any part of your body to check for
hydraulic leaks. When checking for hydraulic
leaks, wear safety glasses and gloves to help
provide protection from spraying hydraulic oil.
Use a piece of cardboard or paper to search
for leaks.
5. Inspect for leaks and check the level of the hydraulic
fluid in the reservoir. Shut the engine OFF.
6. Wipe up any hydraulic fluid spillage in, on, near and
around the vehicle, work area and tools.
Hydraulic System
Avoid prolonged engine
Hydraulic oil leaking
9.125