Lull 944E-42 Service Manual - Manual (Page 603)

9.93 Model 644E-42/944E-42 Rev. 6/04
Electrical System
Replace fuse.
Check auxiliary hydraulic
(F10) 5 amp fuse.
Not
OK
If OK
If
OK
Not
OK
Replace failed solenoid.
If OK
Not
OK
At switch connector, at pin
2, wire [AH3B] (RED/WHT),
check for battery voltage.
Repair/replace open cab
harness.
If OK
Not
OK
With switch in the ON
position, check
for battery voltage at switch
connector, at pin 3, wire
[AH4] (RED).
Replace auxiliary
hydraulic pressure
release switch.
Continued from 9.91
Before troubleshooting any
electrical circuit, ALWAYS
begin by checking the
following:
1. All connections relating to
circuit are clean and tight.
2. All grounding straps are
intact and securely
fastened, refer to Section
9.1.12, “General Overview
(Vehicle Ground Strap
Locations).”
With switch in the ON
position, verify that solenoid
on auxiliary hydraulic
pressure release valve is
magnetized by holding a
metal object next to the
solenoid. Or, test resistance
in solenoid. Refer to
page 9.233
Single Joystick
Pilot Select Valve Solenoids
Function
Abbreviation
on Valve
Transfer Carriage TR
Auxiliary Hydraulics AX
Extend/Retract EXT
Lift/Lower HO
Attachment Tilt Down CTB
Attachment Tilt Up CTA
Problem is hydraulic.
Refer to Section 8,
“Hydraulic System,”
pages 8.130, 8.132,
8.138 or 8.140.
This part of the Single Joystick - Auxiliary Hydraulic Circuit &
Troubleshooting (Option) Applies to Only:
644E-42, SN 20118 & Before, 0160002519 thru 0160003108,
944E-42, SN 20123 & Before, 0160002514 thru 0160003106
Auxiliary hydraulic pressure
release switch does not release
pressure from system.