JLG T350 Service Manual - Manual (Page 37)

SECTION 3 - CHASSIS & TURNTABLE
3121198 – JLG Lift – 3-1
SECTION 3. CHASSIS & TURNTABLE
3.1 BREAKING-IN A NEW TRAILER
Retighten Lug Nuts at First 10, 25 & 50 Miles
Wheel lugs can shift and settle quickly after being first
assembled, and must be checked after the first 10, 25
and 50 miles of driving. Failure to perform this check
could result in a wheel coming loose from the trailer, caus-
ing a crash leading to death or serious injury.
CHECK LUG NUTS FOR TIGHTNESS ON A NEW TRAILER OR
WHEN WHEEL(S) HAVE BEEN REMOUNTED AFTER THE FIRST 10,
25 AND 50 MILES OF DRIVING.
Adjust Brake Shoes at First 200 Miles
Brake shoes and drums experience a rapid initial wear.
The brakes must be adjusted after the first 200 miles of
use, and each 3,000 miles thereafter. The brakes are
adjusted manually. Refer to section 3 for manual brake
adjustment.
Synchronizing the Brake Systems
Trailer brakes are designed to work in synchronization
with the brakes on the tow vehicle. Do not use either brake
system alone to stop the combined tow vehicle and trailer.
When the tow vehicle and trailer braking systems are syn-
chronized, both braking systems contribute to slowing,
and the tongue of the trailer will neither dive nor rise
sharply.
ROAD TEST THE BRAKES IN A SAFE AREA AT NO MORE THAN 30
M.P.H. BEFORE EACH TOW.
To insure safe brake performance and synchronization,
read and follow the axle/brake and the brake controller
manufacturers’ instructions. If you do not have these
instructions, call your dealer or JLG to obtain a copy.
A hard stop is used to:
• Confirm that the brakes work
• Confirm that the trailer brakes are properly synchro-
nized with the tow vehicle brakes.
3.2 TRAILER INSPECTION AND SERVICE
INSTRUCTIONS
Fasteners and Frame Members
Inspect all of the fasteners and structural frame members
for bending and other damage, cracks, or failure. Repair
or replace any damaged fastener and repair the frame
member. If you have any questions about the condition or
method of repair of fasteners or frame members, get the
recommendation of, or have the repair done by, your
dealer.
The various fastener types used on your trailer are:
• Bolts, which are used mainly for attaching door and
gate hinges to the trailer body.
• Buck Rivets, which are used to attach the sides and
roof panels of the body to each other, and to the frame
of the trailer.
• Huck Bolts may be at various locations on the sub-
frame. Huck bolts are not user serviceable. If you
detect a loose huck bolt fastener, do not tow the trailer.
Call your dealer for instructions.
INSPECT FOR BROKEN OR DAMAGED FASTENERS, WELDS OR
OTHER DAMAGED PARTS AT LEAST ONCE A YEAR AND HAVE ALL
DAMAGED PARTS REPAIRED OR REPLACED.
Brake Shoes and Drums
Properly functioning brake shoes and drums are essential
to ensure safety. You must have your dealer inspect these
components at least once per year, or each 12,000 miles.
The brakes should be adjusted (1) after the first 200 miles
of operation when the brake shoes and drums have
"seated," (2) at 3000 miles intervals, (3) or as use and per-
formance requires.
Manually Adjusting Brake Shoes
The manually adjusted brakes should be adjusted in the
following manner:
1. Jack up the trailer and secure it on adequate capac-
ity jack stands.
2. Be sure the wheel and brake drum rotate freely.
3. Remove the wheel and brake drum. Because of the
special stub axle arrangement, adjustment cannot
be made through the backing plate.
4. With a screwdriver or standard adjusting tool, rotate
the starwheel of the adjuster assembly to expand
the brake shoes. Adjust the brake shoes out until the