8 towing a disabled machine, 1 manually releasing the park brake, 2 manually resetting the park brake – JLG G12-55A Service Manual User Manual
Page 91: Towing a disabled machine, Manually releasing the park brake, Manually resetting the park brake
5-11
G10-55A, G12-55A
Axles, Drive Shafts, Wheels and Tires
5.8
TOWING A DISABLED MACHINE
Towing a disabled machine should only be attempted as
a last resort, after exhausting all other options. Make
every effort to repair the machine, and move it under its
own power, before using the emergency towing
procedures outlined below.
Note: Block the wheels of the machine BEFORE
attempting to release the park brake. Once the park
brake is released the machine’s park brake AND service
brakes are inoperable.
5.8.1
Manually Releasing the Park Brake
1. Loosen the nuts of the screws (5) for the manual
release of the braking units. Draw the nuts back
approximately 6 mm.
2. Tighten the screws until they are gently seated on
the driving plate.
3. Carefully tighten each release screw a 1/4 turn at a
time in sequence until all have been turned on full
turn 360°.
4. Repeat steps 1 thru 3 for other side of differential.
Note: After machine has been towed to a secure
location, reactivate parking brake. Carefully follow
procedures from start to finish. Contact local JLG dealer
if you are unsure about any part of the procedure, or for
specific instructions concerning your particular situation.
5.8.2
Manually Resetting the Park Brake
Note: Block the wheels of the machine BEFORE
attempting to reset the machine’s park brake. Once the
park brake is released the machine’s park brake AND
service brakes are inoperable.
1. Loosen each release screw (5), only 1/4 turn at a
time, in sequence, until each screw has lost contact
with the guide pin.
2. Remove screws along with nuts and seals. Replace
seals, lubricate screws with a silicone-based grease
and re-install screws along with nuts.
3. Adjust the nut of the screw heads in relation to the
arm by 1.18 in (30 mm).
4. Repeat steps 1 thru 3 for other side of differential.
5. After repairs to machine have been made, start
machine and check park brake and service brakes
for proper function. Refer to Section 8.7.4, “Service
Brake Bleeding,” Section 8.7.5, “Service Brake Test,”
and Section 8.7.6, “Steering Orbitrol Valve.”
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