Lull 944E-42 Service Manual - Manual (Page 613)

9.103 Model 644E-42/944E-42 Rev. 6/04
Electrical System
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).”
Continued from 9.101
If
OK
Replace failed solenoid.
Repair/replace
single joystick
harness.
Not
OK
Plug cab harness back into single
joystick harness. With roller all the way
forward, check for voltage across
solenoid CTB, connector wires
[RTA] (ORG) and [RTB] (GRY).
Not OK
If OK
If OK
Problem is hydraulic.
Refer to Section 8,
“Hydraulic System,”
page 8.104
If OK
Forks fail to move backward.
Replace fuse.
Check auxiliary hydraulic
(F10) 5 amp fuse.
Not
OK
If OK
Disconnect joystick harness from
jumper harness (early production) or
joystick harness (late production).
Check for battery voltage at pin 1, wire
[AH1B] (RED/WHT) on the joystick
harness female connector.
Early Production: Replace
joystick, jumper harness and
control module with new late
production joystick assembly.
Late Production: Replace
joystick handle.
Not
OK
With roller all the way forward verify
that solenoid CTB is magnetized by
holding a metal object next to the
solenoid. Or, test resistance in
solenoid. Refer to page 9.233
Unplug single joystick harness at hyd
joystick connector and measure
battery voltage at pin A.
Wire [AH1] (RED/WHT) is open.
Repair/replace open cab harness.
Not
OK
If OK
Not
OK
Verify wire [AHG6] (BLK) ground
connection at cab ground stud.
Repair/secure ground
connection properly.
If OK
Not
OK
At hyd joystick connector, verify
ground connection at pin C, wire
[AHG6] (BLK).
Repair/replace open cab harness.
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