Lull 944E-42 Service Manual - Manual (Page 441)

8.189 Model 644E-42/944E-42 Rev. 6/04
Hydraulic System
8.12.6 Single Joystick Pilot Select Valve
Pilot pressure from the joystick flows to the single joystick
pilot select valve (8). The pilot pressure is then directed
to the appropriate section of the main control valve. The
direction of the flow is controlled by the solenoid
cartridges (9) on the valve. The solenoid cartridges (9)
are controlled by holding the trigger button down on the
joystick or by pushing the thumb button up or down.
The single joystick pilot select valve (8) is located on the
valve plate (10) which is located under the cab floor.
a. Single Joystick Pilot Select Valve Removal
1. Park the vehicle on a firm, level surface, fully retract
all hydraulic cylinders, ground the attachment (if
any), place the travel select lever in the [N]
NEUTRAL DETENT position, engage the park brake
switch and shut the engine OFF.
2. Place an Accident Prevention Tag on both the
ignition switch and the steering wheel, stating that
the vehicle should not be operated. Refer to Section
1.5, “Accident Prevention Tag Usage.”
3. Unlatch and open the engine cover. Allow the
hydraulic fluid to cool.
4. Remove the access plate from the floor of the cab
and right console side access panel.
5. Label or otherwise mark the hydraulic hoses in
relation to the single joystick pilot select valve (11).
Disconnect and cap all hoses and fittings. Label or
mark any wire harness connectors as they relate to
the single joystick pilot select valve.
6. Remove the two capscrews (12) holding the single
joystick pilot select valve (11) to the valve plate.
Remove the single joystick pilot select valve from the
valve plate (13).
MU5630
8
9
10
WARNING:
Hot hydraulic fluid can
cause severe burns. Wait for hydraulic fluid to
cool before servicing any hydraulic component.
MU5640
11
12
13