SkyTrak 8042 Service Manual - Manual (Page 520)

8.105 Model 8042, 10042, 10054 Legacy Rev. 10/03
Hydraulic System
5. 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.
6. 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.
7. Wipe up any hydraulic fluid spillage in, on, near and
around the vehicle, work area and tools.
d. Outrigger Valve Test
Raise and lower the outriggers to check the outrigger
hydraulic circuit for proper function.
8.12.8 Outrigger Shuttle Valve (10042/10054)
The outrigger shuttle valve (10) is attached to the main
control valve (11) with a straight fitting (12). The shuttle
valve joins the outrigger load sense line (13) and the
steer/brake load sense line (14) and selects the higher
signal to feed to the main control valve shuttle line. The
shuttle valve contains a pressure-dependent, two-way
check valve and is a nonserviceable item. It must be
replaced in its entirety if defective.
a. Outrigger Shuttle Valve Removal
1. Park the vehicle on a firm, level surface, fully retract
the boom, raise the boom, place the travel select
lever in (N) NEUTRAL, place the neutral lock lever in
the (N) NEUTRAL LOCK position, engage the park
brake switch and shut the engine OFF.
2. Place an Accident Prevention Tag on both the
ignition key switch and the steering wheel, stating
that the vehicle should not be operated. Refer to
Section 1.5, “Accident Prevention Tags.”
3. Temporarily block up or support the raised boom.
WARNING:
Avoid prolonged engine
operation in closed areas with inadequate
ventilation. Failure to properly ventilate exhaust
fumes can result in death or serious injury.
WARNING:
Hydraulic oil leaking 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.
WARNING:
DO NOT get under a raised
boom unless the boom is blocked up. Always
block the boom before doing any servicing that
requires the boom to be up. Unexpected lowering
of the boom may cause death or serious injury.
MH3770
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