When one drive wheel has bad traction, the other
wheel turns freely. This action causes a loss of power
which is stopped by the differential lock. This is done by
sending power to both wheels through a jaw clutch. The
jaw clutch lets the differential engage or release while
machine is using full power at any speed. The jaw clutch
can be engaged at any speed before the wheels start to
The operator must choose the time he needs to
engage the jaw clutch. An example of one such need is,
when one wheel starts to turn freely, or a noise is caused
by the jaw clutches hitting each other, lower the engine
speed to let the jaw clutches engage.
The operator must keep the pedal for the differential
lock pushed down to keep the jaw clutches engaged.
When the differential lock is engaged, the speed of the
wheels is the same. The condition of the surface has no
effect on the speed at which the wheels turn. Power is
divided and the same amount is sent to each wheel.
This stops a loss of power by not letting one wheel turn
freely. Releasing the pedal releases the differential lock.
WARNING: Do not turn the machine
while the pedal for the differential lock is
When the pedal for the differential lock is pushed
down, pressure air from the control valve of differential
lock goes to air cylinder (3) of the differential lock.
1. Springs. 2. Jaw. 3. Cylinder. 4. Jaw. 5.
The pressure air pushes piston (5) to the inside
causing the jaws to engage. Jaw (2) of the clutch is
fastened to the differential housing by splines. Jaw (4) is
fastened to the right axle shaft. When the jaws are
engaged, there is a connection between the right axle
shaft and the differential housing. The differential gears
and the differential housing do not move so this
connection causes the effect of one axle drive.
When the pedal is released, the reduction in air
pressure to cylinder (3) causes piston (5) to move to the
outside. The jaws are then not engaged. Springs (I)
between housing and piston keep the jaws from being
engaged, until air pressure is sent to the cylinder. When
the differential is not engaged, the operation of the
differential is normal.