operators_manual

How to Manually Lock a Differential
Always lock the differential when the axles
are being removed to aid in re-installation.
Follow these procedures if the vehicle has
a driver controlled differential lock.
This procedure should be done before the
axle shafts are removed.
CAUTION
Failure to install the caging bolt when
towing vehicles with driver-control
main differential lock can result in
damage by failing to lock internal com-
ponents in position.
WARNING
An open air line on the recovered vehi-
cle will cause a leak in the air system
of the recovery vehicle if both vehicles’
brake systems are connected. This
could cause a loss of system air, which
can cause the service brakes not to
function, resulting in the sudden appli-
cation of the spring brakes causing
wheel lock-up, loss of control, or over-
take by following vehicles. You could
be in an accident involving death or
personal injury. Ensure that any air line
that has been removed from a driver-
controlled main differential lock is firm-
ly capped to prevent loss of air pres-
sure from the recovery vehicle if it is
supplying air pressure.
CAUTION
A recovered vehicle will have no op-
erational brake system. Additionally,
the rear axle spring brakes will proba-
bly be applied.
1. Caging bolt storage location
2. Location of air line to differential
lock actuator
• If you desire to use the recovered
vehicle’s brakes, ensure that the
vehicles air system is connected to
that of the recovery vehicle. Also
ensure that any air line that has
been removed from a driver-
controlled main differential lock is
firmly capped to prevent loss of air
pressure from the recovery vehicle.
• If you don’t desire to use the
recovered vehicle’s brakes, ensure
that you cage the spring brakes
before attempting to move the
vehicle.
1. Remove the air line and firmly cap
the air line from the vehicle. (2)
2. Remove the caging bolt from its
storage hole. (1)
3. Screw the caging bolt into the air
line hole. (2)
When fully engaged, a 0.25 - 0.5 in.
(6.35-12.7 mm) space will remain between
the air cylinder and the bolt head. This
action will lock the differential by pushing a
piston into a “lock” position.
Recovery Hitch Capacities
The maximum rated loads for vehicle
recovery varies depending on the direction
or angle of pull. These capacities are listed
EMERGENCY - How to Recover a Vehicle
54 Y53-6047-2HEN (03/18)
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