Brake Maintenance - JLG t350 Service And Maintenance Manual

Brake Maintenance

WHEEL BRAKES
The linings of the wheel brakes are wearing parts, so their
condition must be checked every 3000 miles (5000 km) or
every year, whichever comes first, using the view holes on
the wheel backing plates.
If the connecting rod can be pushed in more than approx-
imately 45 mm when the over-run braking system is
checked as outlined above, this is a sure sign of advanced
wearing of the brake linings. If this is the case, the wheel
brakes must be readjusted at a qualified workshop, and if
necessary, the brake shoes must be replaced.
WHEEL MOUNTS
The wheel hubs have maintenance-free, double row angu-
lar ball bearings.
The sideways bearing play should be checked at intervals
of 3000 miles (5000 km) by checking whether the wheels
have sideways play when the trailer is jacked up. If there is
detectable play, the trailer should be checked at a quali-
fied workshop.
REPLACING BRAKE ASSEMBLY COMPLETE
IT IS RECOMMENDED THAT THE BRAKE ASSEMBLIES ARE
REPLACED IN AXLE SETS.
1. Follow steps 1 thru 7 of REPLACING BRAKE
SHOES.
2. The brake assemblies are left and right specific,
check the new assembly against the one fitted not-
ing the position of the brake cable attachment.
Remove the four bolts securing the backplate to the
axle, remove the old assembly and install the new
using the proper torque values.
3. Continue with the procedure under REPLACING
BRAKE SHOES, starting at step 18.
4. Follow the procedure under ADJUSTMENT.
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SECTION 3 - CHASSIS & TURNTABLE
REPLACING BRAKE SHOES
Place the trailer on stands with all wheels off of the
ground. WARNING: The handbrake should be released
and the handbrake locking bolt installed.
Some couplings do not have provision for the locking bolt.
In this case or if a bolt cannot be used the handbrake
lever should be secured in the off position to prevent the
handbrake lever from operating.
NOTE: It is recommended that the brake shoes are replaced
in axle sets.
1. Remove the wheels.
2. Remove the hub cap.
3. Slacken off the brake adjuster bolt until free. Some
brake assemblies have a ratchet accessible through
an opening in the backplate instead of the bolt.
4. Remove the axle nut, this may be a castellated nut
retained with a cotter pin or it may be a locknut.
5. Remove the brake drum (hub puller may be
required) taking care not to displace the bearings.
AVOID INHALING BRAKE DUST. DON'T USE AN AIR LINE TO
CLEAN THE DRUM. CAREFULLY REMOVE THE DUST USING A
SMALL BRUSH.
6. Check the condition of the brake drum. Replace the
brake drum if deep score marks are visible.
– JLG Lift – 3-21