Isuzu N-Series. Manual - part 149

WHEELS AND TIRES 3E-9

Wheels

Replacement

Damaged wheels and wheels with excessive run-out
must be replaced.
Wheel Run-out at Rim
1.5 mm (0.059 in) or less

Caution:
Wheel repairs that use welding, heating or preening are
not permitted. Replace wheel lug nuts if they are bent,
dented, have excessive lateral or radial run-out, leak air
through welds, have elongated bolt holes, will not stay
tight, or if they are heavily rusted.

NPR75

195/85R16

588 (6.00, 85)

205/75R17.5

750 (7.65, 108.7)

215/75R17.5

600 (6.00, 85)

215/75R16C

525 (5.36, 76)

NPR77

195/75R16C

475 (4.75, 68)

NPS71

7.50R16-12PR

637 (6.50, 92)

NPS75

8.5R17.5

625 (6.4, 90.6)

NQR66

7.50-16-14PR

637 (6.50, 92)

8.25-16-14PR

564 (5.75, 82)

8.25-16-12PR

490 (5.00, 71)

NQR70

7.50-16-14PR

637 (6.50, 92)

215/75R17.5

600 (6.00, 85)

7.50-16-10PR

515 (5.25, 75)

7.50R16-10PR

564 (5.75, 82)

7.50R16-12PR

637 (6.50, 92)

NQR71

7.50-16-14PR

637 (6.50, 92)

8.25-16-14PR

564 (5.75, 82)

NQR71

8.25-16-12PR

490 (5.00, 71)

NQR71

(For GCC)

215/75R17.5

600 (6.00, 85)

NQR75

7.50-16-14PR

637 (6.50, 92)

215/75R17.5

600 (6.00, 85)

225/70R19.5

850 (8.50, 122)

7.50-16-10PR

515 (5.25, 75)

7.50-16-12PR

588 (6.00, 85)

7.50R16-10PR

564 (5.75, 82)

7.50R16-12PR

637 (6.50, 92)

Tire size

Tire inflation pressure

kPa (kg/cm

, psi)

Vehicle model

Front

Rear

Front

Rear

3E-10 WHEELS AND TIRES

General Balance Procedure

Deposits of mud, etc. must be cleaned from the inside of
the rim.
The tire should be inspected for the following: match
mount paint marks, bent rims, bulges, irregular tire wear,
proper wheel size and inflation pressure. Then balance
according to the equipment manufacturer’s recommen-
dations.
There are two types of wheel and tire balance.
Static balance is the equal distribution of weight around
the wheel.
Assemblies that are statically unbalanced cause a
bouncing action called tramp. This condition will eventu-
ally cause uneven tire wear.

Dynamic balance is the equal distribution of weight on
each side of the wheel center-line, so when the tire
spins, there is no tendency for the assembly to move
from side to side. Assemblies that are dynamically un-
balanced may cause shimmy.

Warning:

WARNING:
STONES SHOULD BE REMOVED FROM THE TREAD
TO AVOID OPERATOR INJURY DURING SPIN BAL-
ANCING AND TO OBTAIN A GOOD BALANCE.

Balancing Wheel and Tire

On-Vehicle Balancing

On-Vehicle balancing methods vary with equipment and
tool manufacturers. Be sure to follow each manufactur-
er’s instructions during balancing operation.

Off-Vehicle Balancing

Most electronic off-vehicle balancers are more accurate
than the on-vehicle spin balancers. They are easy to use
and give a dynamic balance. Although they do not cor-
rect for drum or disc unbalance (as on vehicle spin bal-
ancing does), they are very accurate.

Legend

A. Corrective weights

1. Heavy spot wheel tramp
2. Add balance weights here
3. Center line of spindle

N3A0437E

N3A0438E

Legend

A. Corrective weights

1. Heavy spot wheel shimmy
2. Add balance weights here
3. Center line of spindle

N3A0439E