JLG 4017 Service Manual - Manual (Page 76)

Axles, Drive Shafts, Wheels and Tires
5.14 4017
5.7 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.
IMPORTANT: 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.
5.7.1 Manually Releasing the Park Brake
1. Measure the distance from the bolt head to the face
of the jam nut on all four of the manual brake release
bolts (1) located on each side of the front axle center
section (two per side). Record the measurements.
2. Loosen the jam nuts on the four manual brake
release bolts
3. Turn all four release bolts in equally with a wrench or
socket BY HAND a quarter turn at a time up to
approximately
19 mm (.750 in) or until resistance is felt. Tighten the
jam nuts.
Note: Turning the release bolts in to far could warp the
brake discs. DO NOT over tighten.
IMPORTANT: After the machine has been towed to a
secure location, reactivate the park brake. Carefully
follow the procedures from start to finish. Consult your
local JLG distributor or the JLG Service Department if
you are unsure about any part of the procedure, or for
specific instructions concerning your particular situation.
5.7.2 Manually Resetting the Park Brake
IMPORTANT: Block the wheels of the machine
BEFORE attempting to reset the machine’s park
brake. Once the park brake is reset the machine’s
park brake AND service brakes are operable.
1. Loosen the jam nuts on all four manual brake
release bolts.
2. Turn all four manual brake release bolts OUT a
quarter turn at a time to the dimension recorded
before starting the towing procedure.
3. Tighten the jam nuts on all four manual brake
release bolts.
4. After repairs to the machine have been made, start
the machine and check the park brake and service
brakes for proper function.
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