Lull 944E-42 Service Manual - Manual (Page 187)

9-29 944E-42
Electrical System
4. Disconnect the single joystick harness connector (3)
from the joystick connector (4).
Check the single joystick harness 6 pin connector (3)
with a DMM for battery voltage. Place the negative
(-) lead in pin 2 (ground) and the positive (+) lead on
pin 1, and test for battery voltage.
If battery voltage is not present, the single joystick
harness (5) is suspect and should be replaced. If
battery voltage is present, the harness is functioning
properly.
5. If the single joystick harness (5) is functioning
properly, test the handle assembly. Refer to Section
4.3.6, “Joystick Assemblies.”
6. If the joystick handle is not working properly, the
handle can be replaced
b. Single Joystick Handle Replacement
1. Remove the joystick valve assembly (6) from the
side console. Refer to Section 4.3.6, “Joystick
Assemblies.”
2. Secure the valve body (7) in a bench vise or by other
suitable means.
3. Roll the boot (8) up to expose the locknut (9) at the
bottom of the handle.
4. Lift the wire harness bushing (10) to clear the
retaining hole in the ring on the joystick assembly.
Slide the wire harness out through the slot.
5. Hold the nut on top of the joint assembly in place
while loosening the locknut (9) on the handle
assembly.
6. Remove the handle assembly with the boot. If not
replacing the boot, remove the boot from the handle.
7. To assemble the new handle, slide the wire harness
through the boot and assemble the boot to the
handle assembly.
8. Roll the boot up to expose the locknut at the bottom
of the handle assembly.
9. Thread the handle assembly onto the joint assembly.
10. Make sure that the center line of the handle (11) is in
line with ports 3 (12) and 4 (13) on the valve body
before tightening the locknut on the handle
assembly.
11. Assemble the front joystick valve assembly into the
side console. Refer to Section 4.3.6, “Joystick
Assemblies.”
MU6311
6
7
8
9
10
MU6251
12
13
11