Joystick Valve - JLG sky trak mmv Service Manual

WARNING:
operation in closed areas with inadequate ven-
tilation. Failure to properly ventilate exhaust
fumes can result in death or serious injury.
6. Start the engine and run at approximately one-third to
one-half 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.
7. Inspect the secondary function manifold 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 con-
tinuing. Add hydraulic fluid to the reservoir as needed.
8. Wipe up any hydraulic fluid spillage in, on, near and
around the vehicle, work area and tools.
d. Secondary Function Manifold Test
Conduct a pressure check of the park brake circuit. Refer
to Section 9.7, Hydraulic System Testing .
Model MMV Rev. 12/04
Avoid prolonged engine
Hydraulic oil leaking
9.12.6

Joystick Valve

The joystick valve (9) is part of the joystick assembly. Joy-
stick commands are actuated both electrically and hy-
draulically via a set of solenoid-operated control valves
mounted in an array at the pilot select manifold.
9
Verify the correct operation of the joystick switches and
circuit solenoids before considering replacement of the
joystick valve. Refer to Section 10.13.10, Joystick. The
valve itself is not serviceable and must be replaced in its
entirety if replacement of electrical parts does not solve
the problem. Refer to Section 3.5.2, Joystick Replacement.
After replacing the joystick valve assembly, check for the
proper functioning of all joystick functions.
Hydraulic System
MT2190
9.119