BRACKET AS 1400446 - Caterpillar

Illustration 1 g03785800
Differential lock disengaged
(A) Differential lock actuator
(B) Differential lock solenoid valve
(C) Charge pressure from the charge pump through the implement valve
Illustration 2 g03785801
Differential lock engaged
(A) Differential lock actuator
(B) Differential lock solenoid valve
(C) Charge pressure from the charge pump through the implement valve The front axle is equipped with a locking differential. The action of the differential can cause the drive to be lost in adverse ground conditions if the traction under one wheel is low. In these circumstances, all the drive will be transferred to the wheel with the least traction.The locking differential enables the axle shafts of the universal joints to be locked together. Both wheels can then rotate at the same speed and torque regardless of different ground traction between the wheels.
Illustration 3 g02730699
Third function joystick
Illustration 4 g03387563
Fourth function joystick
The differential lock is controlled by a momentary trigger switch that is located on the joystick.The differential lock is controlled in the following way:
The differential lock is engaged by oil pressure when the trigger switch is continuously depressed.
The differential lock is disengaged by spring force when the trigger switch is released.The trigger switch for the differential lock control operates an on/off solenoid valve. When the trigger switch is pulled, a ground is applied to the differential lock circuit in the Electronic Control Module (ECM). The ECM powers on the differential lock solenoid in response to the ground signal from the switch. Pilot oil is supplied to the differential lock solenoid from the implement pilot circuit. When the trigger switch is released, the ECM will no longer have a ground applied to the differential lock circuit. With no ground on the differential lock circuit, the ECM powers off the differential lock solenoid. With the differential lock solenoid disabled the hydraulic pressure in the differential lock vents to tank. The differential lock will disengage when the torque on both wheels equalizes.
Illustration 5 g01408505
Differential lock actuator
(1) Fork
(2) Spring
(3) Piston
(4) Shaft
(5) Spring Fork (1) is located on shaft (4) in the differential housing. When the trigger switch is pressed, oil pressure is supplied to the solenoid valve. Oil pressure from the solenoid valve exerts pressure on piston (3). The piston moves the shaft and the fork against springs (2) and (5). This movement engages the differential lock.
Illustration 6 g01408507
Differential lock
(1) Fork
(6) Collar
(7) Slots
(8) Side gear Fork (1) moves collar (6) axially across the differential. Four pins that are located in the collar engage in slots (7) in side gear (8) of the differential. The engagement of the pins locks the differential.In normal operation, the differential is unlocked and the axle shafts are free to rotate at different speeds. The wheel speed is governed by the traction at the wheel.Fork (1) and collar (6) are held clear of the differential by springs (2) and (5) when the differential is unlocked. Refer to Illustrations 5 and 4.