Lull 944E-42 Service Manual User Manual download pdf (Page 737)

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101

9.227

Model 644E-42/944E-42 Rev. 6/04

Electrical System

9.14.10 Dual Joystick

This vehicle is equipped with three separate hydraulic

joysticks.

• The front joystick (14) controls attachment tilt and

transfer carriage operation. The button (15) on the

front joystick controls the auxiliary hydraulic function.

(Refer to Section 9.8.29, “Dual Joystick - Auxiliary

Hydraulic Circuit & Troubleshooting.”)

This joystick is the only joystick that has an active

electrical button. This button activates the solenoids

on the selector valve which switches hydraulic flow

from the transfer carriage circuit to the auxiliary

hydraulic circuit.

• The middle joystick (16) controls boom lift/lower and

extend/retract functions.

• The rear joystick (17) controls the frame sway

function. This joystick is a single axis joystick with a

lift to shift lock ring detent and controls the frame

sway to the left and right

Two functions can be accomplished at the same time by

moving the joystick in between quadrants. For example,

moving the stick forward will lower the boom, and moving

the stick to the left will retract the boom; moving the

joystick forward and to the left will both lower and retract

the boom at the same time.

The speed of movement relates to the amount of joystick

movement away from the center position. The overall

speed of movement also depends directly on engine rpm.

Joystick mode operation can be checked according to the

joystick operation instructions found in the Owners/

Operators Manual for this vehicle. Operational checks will

indicate whether the system is working properly. If a

designated function does not occur as described, check

both the electrical and hydraulic circuit involved to

determine the cause.

a. Front Joystick Button Testing

1. Remove the six capscrews (18) (two not shown)

securing the access panel (19) to the side

console (20). Remove the access panel.

2. Disconnect the cab wire harness connector

plug (21) from the joystick connector plug (22).

3. Check the cab harness connector plug (21) with a

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

on pin B and the positive (+) lead on the 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.

OU0410

MU4040

MU4090

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