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Diagnosis
Diagnosis Table
Refer to “Diagnosis Table” in Section 3.
Balancing Wheels
There are two types of wheel and tire balance: static and
dynamic. Static balance, as shown in figure, is equal distribution
of weight around wheel. Wheels that are statically unbalanced
cause bouncing action called tramp. This condition will eventually
cause uneven tire wear.
Dynamic balance, as shown in left figure, is equal distribution of
weight on each side of wheel centerline so that when the tire
spins there is no tendency for the assembly to move from side to
side. Wheels that are dynamically unbalanced may cause
shimmy.
General Balance Procedure
Deposits of mud, etc. must be cleaned from inside of rim.
Tire should be inspected for any damage, then balanced according to equipment manufacturer’s recommenda-
tion.
Off-vehicle balancing
Most electronic off-vehicle balancers are more accurate than on-vehicle spin balancers. They are easy to use
and give a dynamic (two plane) balance. Although they do not correct for drum or disc unbalance as does on-
vehicle spin balancing, this is overcome by their accuracy, usually to within 1/8 ounce.
On-vehicle balancing
On-vehicle balancing methods vary with equipment and tool manufacturers. Be sure to follow each manufac-
turer’s instructions during balancing operation.
1. Heavy spot wheel tramp [A] : Before correction
2. Balance weights addition point [B] : Corrective weights
3. C/L of spindle
1. Heavy spot wheel shimmy [C] : Before correction
2. Balance weights addition point [D] : Corrective weights
3. C/L of spindle
WARNING:
Stones should be removed from tread in order to avoid operator injury during spin balancing and to
obtain good balance.
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WARNING:
Wheel spin should be limited to 35 mph (55 km/h) as indicated on speedometer.
This limit is necessary because speedometer only indicates one-half of actual wheel speed when one
drive wheel is spinning and the other drive wheel is stopped.
Unless care is taken in limiting drive wheel spin, spinning wheel can reach excessive speeds. This
can result in possible tire disintegration or differential failure, which could cause serious personal
injury or extensive vehicle damage.
CAUTION:
For vehicle equipped with ABS, using on-vehicle balancing method with ignition switch ON may set
malfunction diagnostic trouble code (DTC) of ABS even when system is in good condition.
Never turn ignition switch ON while spinning wheel.
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Maintenance and Minor Adjustments
Wheel and Tire
Wheel repairs that use welding, heating, or peening are not approved. All damaged wheels should be replaced.
Studs
If a broken stud is found, see Section 3E (rear) or Section 3D (front) for Note and Replacement procedure.
Matched tires and wheels
(For vehicle equipped with steel wheels)
Tires and wheels are matchmounted at the assembly plant.
This means that the radially stiffest part of the tire, or “high spot”,
is matched to the smallest radius or “low spot” of the wheel.
This is done to provide the smoothest possible ride.
The “high spot” of the tire is originally marked by paint dot (1) on
the outboard sidewall. This paint dot will eventually wash off the
tire.
The “low spot” of the wheel is originally marked by paint dot (2) on
the wheel rim-flange. Properly assembled, the wheel rim’s paint
dot should be aligned with the tire’s paint dot as shown in left fig-
ure.
Whenever a tire is dismounted from its wheel, it should be
remounted so that the tire and wheel are matched. If the tire’s
paint dot cannot be located, a line should be scribed on the tire
and wheel before dismounting to assure that it is remounted in
the same position.
Inflation of Tires
The pressure recommended for any model is carefully calculated to give a satisfactory ride, stability, steering,
tread wear, tire life and resistance to bruises.
Tire pressure, with tires cold, (after vehicle has set for three hours or more, or driven less than one mile) should
be checked monthly or before any extended trip. Set to the specifications on the tire placard located on the
driver’s side door lock pillar.
It is normal for tire pressure increase when the tires become hot during driving. Do not bleed or reduce tire pres-
sure after driving. Bleeding reduces the “Cold Inflation Pressure.”
Higher than Recommended Pressure Can Cause:
1) Hard ride
2) Tire bruising or carcass damage
3) Rapid tread wear at center of tire
Unequal Pressure on Same Axle Can Cause:
1) Uneven braking
2) Steering lead
3) Reduced handling
4) Swerve on acceleration
Valve caps should be kept on valves to keep dust and water out.
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Lower than Recommended Pressure Can Cause:
1) Tire squeal on turns
2) Hard steering
3) Rapid and uneven wear on the edges of the tread
4) Tire rim bruises and rupture
5) Tire cord breakage
6) High tire temperatures
7) Reduced handling
8) High fuel consumption
Tire placard
The tire placard is located on the driver’s side door lock pillar and should be referred to for tire information. The
placard lists the maximum load, tire size and cold tire pressure where applicable.
Tire rotation
To equalize wear, rotate tires according to left figure. Radial tires
should be rotated periodically. Set tire pressure. NOTE:
Whether rim size and/or maximum load are listed or not depends on regulations of each country.
NOTE:
Due to their design, radial tires tend to wear faster in the
shoulder area, particularly in front positions. This makes
regular rotation especially necessary.
[A] : RH steering vehicle
[B] : LH steering vehicle
F : Front
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On-Vehicle Service
Wheel
REMOVAL
1) Loosen wheel nuts by approximately 180° (half a rotation).
2) Hoist vehicle.
3) Remove wheel.
INSTALLATION
Wheel nuts must be tightened in sequence and to proper torque
to avoid bending wheel or brake drum or disc as shown.
Tightening order
: “A”–“B”–“C”–“D”–“E”
Tightening torque
Wheel nuts
(a) : 95 N·m (9.5 kg-m, 69.0 lb-ft) CAUTION:
Never use heat to loosen tight wheel because application
of heat to wheel can shorten life of wheel and damage
wheel bearings.
NOTE:
Before installing wheels, remove any build-up of corro-
sion on wheel mounting surface and brake drum or disc
mounting surface by scraping and wire brushing. Install-
ing wheels without good metal-to-metal contact at
mounting surfaces can cause wheel nuts to loosen,
which can later allow wheel to come off while vehicle is
moving.
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Tire
Mounting and demounting
Use tire changing machine to mount or demount tires. Follow equipment manufacturer’s instructions. Do not use
hand tools or tire irons alone to change tires as they may damage tire beads or wheel rim.
Rim bead seats should be cleaned with wire brush or coarse steel wool to remove lubricants, old rubber and
light rust. Before mounting or demounting tire, bead area should be well lubricated with approved tire lubricant.
After mounting, inflate to 240 kPa (35 psi) so that beads are completely seated. Then adjust pressure to speci-
fied shown on tire placard.
Install valve core and inflate to proper pressure.
Repair
There are many different materials and techniques on the market to repair tires. As not all of these work on all
types of tires, tire manufacturers have published detailed instructions on how and when to repair tires. These
instructions can be obtained from the tire manufacturer.WARNING:
Do not stand over tire when inflating. Bead may break when bead snaps over rim’s safety hump and
cause serious personal injury.
Do not exceed 240 kPa (35 psi) pressure when inflating. If 240 kPa (35 psi) pressure will not seat
beads, deflate, re-lubricate and reinflate. Over inflation may cause bead to break and cause serious
personal injury.
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Downloaded from www.Manualslib.com manuals search engine BRAKES 5-5
Diagnosis Table
Condition Possible Cause Correction
Not enough braking
forceBrake oil leakage from brake lines Locate leaking point and repair.
Brake disc or pads stained with oil Clean or replace.
Overheated brakes Determine cause and repair.
Poor contact of shoes on brake drum Repair for proper contact.
Brake shoes linings stained with oil or wet with
waterReplace.
Badly worn brake shoe linings Replace.
Defective wheel cylinders Repair or replace.
Malfunctioning caliper assembly Repair or replace.
Air in system Bleed system.
Maladjusted sensor spring length of LSPV Check or adjust.
Broken sensor spring of LSPV Replace.
Defective collar of LSPV Replace.
Malfunctioning ABS (Antilock brake system), if
equippedCheck system and replace as nec-
essary.
Brake pull (Brakes not
working in unison)Pad or shoe linings are wet with water or
stained with oil in some brakesReplace.
Drum-to-shoe clearance out of adjustment in
some brakes (Malfunctioning auto adjusting
mechanism)Check for inoperative auto adjusting
mechanism.
Drum is out of round in some brakes Replace.
Wheel tires are inflated unequally Inflate equally.
Malfunctioning wheel cylinders Repair or replace.
Disturbed front wheel alignment Adjust as prescribed.
Unmatched tires on same axle Tires with approximately the same
amount of tread should be used on
the same axle.
Restricted brake tubes or hoses Check for soft hoses and damaged
lines.
Replace with new hoses and new
double-walled steel brake tubing.
Malfunctioning caliper assembly Check for stuck or sluggish pistons
and proper lubrication of caliper
slide bush.
Loose suspension parts Caliper should slide.
Check all suspension mountings.
Loose calipers Check and torque bolts to specifica-
tions.
Noise (high pitched
squeak without brake
applied)Front lining worn out Replace brake pads.
Rear brake locked pre-
maturelyMaladjusted sensor spring length of LSPV Check or adjust.
Malfunctioning LSPV assembly Replace assembly.
Brake locked
(For vehicles
equipped with ABS)Malfunctioning ABS, if equipped Check system and replace as nec-
essary.