Lull 944E-42 Service Manual Bedienungsanleitung PDF herunterladen (Seite 186)

Electrical System

9-28

944E-42

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 at the

bottom of the handle.

4. Lift the wire harness bushing (9) to clear the

retaining hole in the ring on the joystick assembly.

Slide the wire harness out through the slot.

5. Use a vise grip to remove the handle assembly (10)

from the joint assembly (11). Use a punch in the hole

(12) on the joint assembly to hold it in place while

loosening the handle assembly.

6. Remove the handle assembly with the boot. If not

replacing the boot, remove the boot from the handle

assembly.

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.

Use a punch in the hole (12) on the joint assembly to

hold it in place while tightening the handle assembly.

10. Assemble the front joystick valve assembly into the

side console. Refer to Section 4.3.6, “Joystick

Assemblies.”

c. Front Joystick Function Solenoid Valve

The front joystick commands are actuated, both

electrically and hydraulically, via a set of solenoid-

operated cartridges within the pilot select valve (13). The

pilot select valve is located on the valve plate which is

located under the cab floor.

d. Solenoid Coil and Cartridge Valve Replacement

If a solenoid coil (14) is suspect of malfunctioning,

disconnect the coil wire lead (15) and test the coil for

proper resistance (8-12 ohms). Replace solenoid if open

or shorted to ground. Also inspect the valve cartridges, o-

rings and other hydraulic and electrical components in

the circuit to accurately determine the cause of the

problem.

The solenoid coils are of the same design. If testing both

coils, insure that the coil wiring connectors are correctly

re-connected.

9.11.10 Optional Single Joystick

This machine can be equipped with an optional single

joystick.

a. Single Joystick Harness Testing

1. Remove the access panel from the side console.

2. Disconnect the single joystick harness connector (1)

from the machine cab harness.

3. Check the cab harness 3 pin connector plug (2) with

a DMM for battery voltage. Place the negative (-)

lead on pin C and the positive (+) lead on pin A, and

test for battery voltage.

If battery voltage is not present, the wiring harness is

suspect and should be replaced. If battery voltage is

present, the harness is functioning properly.

MU4051

MU6960

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Lull 944E-42 Service Manual Bedienungsanleitung Seite 186

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