Shark SMT • 9.800-504.0
9
Tire Pressure
Proper air pressure for your tires is printed on the
sidewall. Check pressure while tires are cold. Do not
raise or lower pressure to meet load. Pressure other
than recommended pressure will lead to excessive tire
wear or tire failure. Balancing recommended.
Wheels
Check wheels for hole elonga-
tion or “out of round”. This condi-
tion can be caused by lug nuts
not being tight or being too tight.
Trailer wheels can be damaged
by chuck holes or curb jumping.
You may not be aware of the road shock to the wheels
without periodic checks. Replace any wheel that is
bent. Replace any wheel if you see elongation of the
bolt holes.
Wheel Lugs
Wheel lug nuts must be tightened with a torque wrench.
Refer to the chart below for proper torque.
1. Start all bolts or nuts by hand to prevent cross
threading.
2. Tighten bolts or nuts following sequence at right.
3. The tightening of the fasteners should be done in
stages. Following the recommended sequence,
tighten fasteners per wheel torque chart below.
4. Wheel nuts/bolts should be torqued before fi rst
road use and after each wheel removal. Check and
re-torque after the fi rst 10 miles, 25 miles and
again at 50 miles. Check periodically thereafter.
Wheel Torque Requirements
Ball Coupler Hitches
Coupler assembly includes a latch lever and latch
lever safety pin or hitch pin. Be sure the latch lever is
locked and the pin properly secured before moving
your trailer. The pin can be engaged fully only if ball is
properly seated in the coupler.
Tires
Before mounting tires onto wheels make certain that
the rim size and contour is approved for the tire as
shown in the Tire and Rim Association Yearbook or the
tire manufacturer’s catalog. Also make sure the tire will
carry the rated load. If the load is not equal on all tires
due to trailer weight distribution, use the tire rated for
the heaviest wheel position.
NOTE:
The capacity rating molded into the sidewall
of the tire is not always the proper rating for the tire if
used in a trailer application. Use the following guideline:
1. LT and ST tires: use the capacity rating molded
into the tire.
2. Passenger Car Tires: Use the capacity rating
molded into the tire sidewall divided by 1.10.
Use tire mounting procedures as outlined by the Rubber
Manufacturer’s Association or the tire manufacturers.
NOTE: Tire wear should be checked frequently
because once a wear pattern becomes fi rmly
established in a tire it is diffi cult to stop, even if
the underlying cause is corrected.
WEAR PATTERN
CAUSE
ACTION
ACTION
Center
Wear
Over
Infl ation
Adjust pressure
to particular
load per tire
catalog.
Edge
Wear
Under
Infl ation
Adjust pressure
to particular
load per tire
catalog.
Side Wear
Loss of
camber or
overloading
Make sure load
doesn't exceed
axle rating.
Align at align-
ment shop.
Toe Wear
Incorrect
toe-in
Align at align-
ment shop.
Cupping
Out of
balance
Check bearing
adjustment and
balance tires.
Flat
Spots
Wheel
lockup & tire
skidding
Avoid sudden
stops when
possible and
adjust brakes.
WHEEL
SIZE
TORQUE SEQUENCE
1st Stage
2nd Stage
3rd Stage
16"
20 - 25
50 - 60
80-90
WHAT TO CHECK AND HOW TO CHECK
1
2
3
4
5
WHAT TO CHECK AND HOW TO CHECK
