422f2 Side Shift Backhoe Loader Lyf00001-Up (Machine) Powered b (1)

8/17/2019 422f2 Side Shift Backhoe Loader Lyf00001-Up (Machine) Powered b (1)

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Bienvenido: r095gcr Producto: BACKHOE LOADERModelo: 422F2 BACKHOE LOADER LYFConfiguración: 422F2 Side Shift Backhoe Loader LYF00001-UP (MACHINE)POWERED BY C4.4 Engine

Operación de Sistemas422F2, 427F2, 428F2, 432F2, 434F2 and 444F2 Backhoe Loaders Axles, Differential andBrakesNúmero de medio -UENR3745-00 Fecha de publicación -01/12/2014 Fecha de actualización -04/12/2014

i05823760

Differential Lock - If Equipped

SMCS - 3264

NOTICETo prevent damage to the differential, do not engage the differentiallock at high speeds.

In areas of high resistance, it may be necessary to turn the machineslightly in order to aid in unlocking the differential lock. Decreasingthe engine rpm may also be helpful.

During operation on a soft area of ground, wheel slippage can occur. The machine may slow considerably,or the machine may stop completely. The differential transfers most of the power to the spinning wheelwhile the opposite wheel may be on firm ground. With the differential lock, improved traction is possible

because the differential lock enables the wheel on firm ground to obtain power. The machine is able to pullthrough a soft area of ground because of this additional traction.

The differential for the axle has an arrangement which allows the differential to be locked. The mechanismenables the axle shafts to be locked together. Both wheels will then rotate at the same speed. The torque willdepend on the different ground resistance between the wheels. The torque that goes to each wheel is basedon the amount of traction at each wheel.



Illustration 1 g03754079(1) differential lock switch

The differential lock is controlled by a button switch (1) that is located on the left-hand side of the joystickcontrol.

The differential lock is controlled in the following way:

• The differential lock is engaged by oil pressure when the button switch (1) is activated.

• The button must be held to keep pressure going to the differential lock.

• When the differential lock button is released, the differential lock will remain locked until torqueequalizes between the wheels..



Illustration 2 g03744793Solenoid valve for Autoshift

(2) Solenoid valve



Illustration 3 g03754200Solenoid valve for Manual shift

(2) Solenoid valve

The button switch for the differential lock control (1) operates a solenoid valve (2). Oil is supplied to thesolenoid valve from the charge pump for the transmission.

Illustration 4 g01515183Differential lock actuator

(3) Spring

(4) Spring



(5) Shaft

(6) Fork

(7) Piston

Fork (6) is located on shaft (5) in the differential housing. The switch on the floor of the operatorcompartment is pressed oil pressure is supplied to the solenoid valve (2). Oil pressure from the solenoid

valve (2) exerts pressure on piston (7). The piston moves the shaft (5) and the fork (6) against springs (3)and (4).

Illustration 5 g01515278Differential lock

(6) Fork

(8) Collar

(9) Slots

(10) Side gear

Fork (6) moves collar (8) axially across the differential. Four pins that are located in the collar engage inslots (9) in side gear (10) of the differential. This action engages the differential lock.

In normal operation, the differential is unlocked and the axle shafts are free to rotate at different speeds. Thewheel speed is governed by the resistance at the wheel.



Fork (6) and collar (8) are held clear of the differential by springs (3) and (4) when the differential isunlocked.

Copyright 1993 - 2016 Caterpillar Inc.Todos los derechos reservados.Red privada para licenciados del SIS.

Sun Apr 17 2016 23:31:35 GMT-0500 (Hora est. Pacífico, Sudamérica)r095gcr

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422f2 Side Shift Backhoe Loader Lyf00001-Up (Machine) Powered b (1)