Lull 944E-42 Service Manual - Manual (Page 447)

8.195 Model 644E-42/944E-42 Rev. 6/04
Hydraulic System
8.12.9 Auxiliary Hydraulic Pressure Release
Valve (644E-42, Late Production thru
SN 20118, SN 0160002519
thru 0160003108)
(944E-42, Late Production thru
SN 20123, SN 0160002514
thru 0160003106)
The auxiliary hydraulic pressure release valve is attached
right side of the valve plate under the cab.
The auxiliary hydraulic pressure release valve switch is
located on the right front console and when it is activated
it relieves all trapped pressure in the auxiliary hydraulic
lines.
a. Auxiliary Hydraulic Pressure Release 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.
5. Label or otherwise mark the hydraulic hoses (10)
connected to the auxiliary hydraulic pressure release
valve (11). Disconnect and cap all hoses and fittings.
6. Label or mark the wire harness connector (12)
attached to the auxiliary hydraulic pressure release
valve (11). Disconnect electrical connector (12).
7. Remove two capscrews (13) and two washers (14)
from the auxiliary hydraulic pressure release
valve (11) and remove the valve block from the valve
plate (15).
WARNING:
Hot hydraulic fluid can
cause severe burns. Wait for hydraulic fluid to
cool before servicing any hydraulic component.
B
A
MU5840
10
11
12
13
15
14