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Table 9. Tire wear Troubleshooting
Wear Pattern
Center
Wear
Edge
Wear
Side
Wear
Toe
Wear
Cupping
Flat
Spots
lug nut Torque requirements
It is extremely important to apply and maintain proper
wheel mounting torque. Be sure to use only the fasteners
matched to the cone angle of the wheel. Proper procedure
for attachment of the wheels is as follows:
1. Start all wheel lug nuts by hand.
2. Torque all lug nuts in sequence. See Figure 37. do noT
torque the wheel lug nuts all the way down. Tighten each
lug nut in 3 separate passes as defined by Figure 37.
Table 10. Tire Torque requirements
First pass
wheel size
FT-lBs
12"
20-25
13"
20-25
14"
20-25
15"
20-25
16"
20-25
NOTICE
never use an pneumatic air gun to tighten wheel
lug nuts.
wm63-series mixer • operaTion and parTs manual — rev. #0 (069/27/12) — page 31
Cause
Solution
Adjust pressure to
Over Infl ation
particular load per
tire manufacturer
Adjust pressure to
Under
particular load per
Infl ation
tire manufacturer.
Loss of
Make sure load does
chamber or
not exceed axle
overloading
rating. Align wheels.
Incorrect
Align wheels.
toe-in
Check bearing
Out of
adjustment and
balance
balance tires.
Wheel lockup
Avoid sudden stops
and tire
when possible and
skidding
adjust brakes.
second pass
Third pass
FT-lBs
FT-lBs
35-40
50-65
35-40
50-65
50-60
90-120
50-60
90-120
50-60
90-120
Maintenance (Mixer)
3. After first road use, retorque all lug nuts in sequence.
Check all wheel lug nuts periodically.
1
4
3
2
4-LUG NUTS
1
4
3
2
5
5-LUG NUTS
PNEUMATIC
AIR GUN
TORQUE WRENCH
Figure 37. Wheel Lug Nuts Tightening
Sequence
1
6
3
5
4
2
6-LUG NUTS
1
3
6
8
7
5
4
2
8-LUG NUTS
LUG NUTS
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