Page 14 of 15
1
2
3
4
5
5 Bolt Pattern
W
heel
T
orque
V
alues
Wheel Size
1st Stage
2nd Stage
2nd Stage
13" & 15”
20-25 ft./lbs. 35-40 ft./lbs. *50-75 ft./lbs.
Tires
Like the tires on a car, the most important factor in the life of the tires on your trailer is their inflation pressure. The recom-
mended tire inflation pressure is 30 PSI. Under-inflation of tires will lead to added wear and tear and tire failure. During
use of your trailer, inflation pressure should be checked weekly and performed when the tires are cold (prior to operation
of the trailer). In doing this, you will ensure that you are achieving the maximum life and tread wear for your tires.
The proper procedure for the attachment of your wheels is listed at right.
1. Start all bolts or nuts by hand to prevent cross threading.
2. The tightening of the fasteners should be done in stages. Following the
recommended sequence (illustration, right), tighten fasteners per the wheel torque
chart below.
3. Wheel fasteners should be torqued before the first initial road usage and
after each wheel removal. Check and retorque the wheel fasteners after the first 50 miles and again at 500 mile
intervals. Check periodically thereafter to ensure that the proper torque values are maintained.
Wheels and Tires – Inspection and Maintenance
Wheels should be visually checked periodically for dents or cracks. Whenever it is required to have a tire replaced on a
rim, the wheel needs to be checked for balance and distortion.
T
ire
W
ear
D
iagnosTic
c
harT
Wear Pattern
Cause
Action
Center Wear Overinflated tire
Adjust tire pressure to specific load rating per tire catalog
Edge Wear
Under-inflated tire
Adjust tire pressure to specific load rating per tire catalog
Side Wear
Loss of camber
Make sure load does not exceed axle rating. Realign axle
or overloading
at axle shop
Toe Wear
Incorrect toe-in
Align at alignment shop
Cupping
Out-of-balance
Check bearing adjustment and balance tires
Flat Spots
Wheel lockup
Avoid sudden stops when possible and adjust brakes
and tire skidding
Tire wear should also be checked often for abnormal or excessive wear. The following chart will aid you in troubleshoot-
ing if abnormal or excessive tire wear should occur. It is important to monitor tire wear, as once a wear pattern becomes
firmly established in a tire it is difficult to stop, even if the underlying cause is corrected.
