SkyTrak 8042 Service Manual - Manual (Page 521)

Hydraulic System
8.106 Model 8042, 10042, 10054 Legacy Rev. 10/03
4. Unlock and open the rear door. Allow the hydraulic
fluid to cool.
5. Remove the transmission covers.
6. Disconnect, label and cap all hydraulic fittings and
hoses during removal from the shuttle valve (1).
Disconnect the outrigger load sense line (4).
Disconnect the brake load sense line (5). Disconnect
the outrigger shuttle valve from the main control
valve (2). Remove the fittings (3, 6 and 7). Wipe up
any hydraulic fluid spillage.
b. Shuttle Valve Cleaning, Inspection and
Reassembly
1. Clean the shuttle valve with a suitable cleaner before
inspection.
2. Inspect internal passageways and the shuttle valve
overall for wear, damage, etc. If inner surfaces of the
component DO NOT display an ultra-smooth,
polished finish, or are damaged in any way, replace
the shuttle valve. Often, dirty hydraulic fluid causes
failure of internal seals and damage to the polished
surfaces within the shuttle valve.
3. Replace a defective shuttle valve with a new part.
c. Outrigger Shuttle Valve Installation
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.
1. Reattach and secure hoses, fittings, etc. Attach the
shuttle valve to the main control valve at port P2
(10), the load sense outrigger line at port P1 (9), and
the load sense brake valve line at port P3 (11) of the
shuttle valve (8).
2. Check the routing of all hoses, wiring, etc., for sharp
bends or interference with any rotating members,
and install tie wraps and/or protective conduit as
required. Tighten all fittings.
3. Install the lower transmission cover.
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:
Hot hydraulic fluid can
cause severe burns. Wait for hydraulic fluid to
cool before servicing any hydraulic component.
WARNING:
Escaping hydraulic fluid
under pressure can penetrate the skin, causing
death or serious injury. Relieve hydraulic
pressure before servicing any hydraulic
component.
MH3770
1
2
3
4
5
6
7
WARNING:
Avoid prolonged engine
operation in closed areas with inadequate
ventilation. Failure to properly ventilate exhaust
fumes can result in death or serious injury.
P2
P1
P3
MT2170
8
9
10
11