JLG Triple-L Operator Manual - Manual (Page 55)

SECTION 4 - SERVICE AND MAINTENANCE
3121224 – Triple-L-Trailer – 4-15
Model 248 Torsion
Model 4610 Spring
Model 7610 Spring
Model 7612 Spring
The suspension/tires on all series Triple L trailers are set at
the factory with a fixed 3° (degree) POSITIVE camber with
NO LOAD in the trailer.
4.10 UNSEALED BEARINGS (HUBS)
If your trailer has unsealed axle bearings, they must be
inspected and lubricated once a year or 12,000 miles to
insure safe operation of your trailer.
If a trailer wheel bearing is immersed in water, it must be
replaced.
If your trailer has not been used for an extended amount
of time, have the bearings inspected and packed more
frequently, at least every six months and prior to use.
Wheel Bearings
A loose, worn or damaged wheel bearing is the most com-
mon cause of brakes that grab.
To check your bearings, jack trailer and check wheels for
side-to-side looseness. If the wheels are loose, or spin
with a wobble, the bearings must be serviced or replaced.
Most trailer axles are built with sealed bearings that are
not serviceable. Sealed bearings must be replaced as
complete units. Inspect every year.
Wheel Bearing Disassembly
1. After removing the grease cap, cotter pin, spindle
nut and spindle washer, remove the hub and drum
to inspect the bearings for wear and damage.
2. Replace bearings that have flat spots on rollers, bro-
ken roller cages, rust or pitting. Always replace bear-
ings and cups in sets. The inner and outer bearings
are to be replaced at the same time.
3. Replace seals that have nicks, tears or wear.
4. Lubricate the bearings with a high quality EP-2 auto-
motive wheel bearing grease.
Every time the wheel hub is removed and the bearings are
reassembled, follow the steps below to check the wheel
bearings for free running and adjust.
1. Turn the hub slowly, by hand, while tightening the
spindle nut, until you can no longer turn the hub by
hand.
2. Loosen the spindle nut just until you are able to turn
it (the spindle nut) by hand. Do not turn the hub
while the spindle nut is loose.
3. Put a new cotter pin through the spindle nut and
axle.
4. Check the adjustments. Both the hub and the spin-
dle nut should be able to move freely (the spindle
nut motion will be limited by the cotter pin).
Figure 4-11. Suspension Camber Setting (Fixed)
Figure 4-10. Flex Ride Suspension
3°
Positive
Camber