Specifications

Prepare Parts for Reassembly
40 MAINTENANCE MANUAL
2. Use a correct yoke installation tool to install the
yoke.
3. As you install the fork, you should detect re-
sistance between the fork and shaft.
• Ifyoudonot detectresistancebetween the
fork and shaft: Replace the fork.
4. Install and tighten the input, output or pinion
shaft nut to the correct torque. See Section 8.
5. Install the driveline.
6. Remove the safety stands.
7. Lower the vehicle.
Tire Matching for Tandem and Tridem
Axles
CAUTION
UNMATCHED TIRES ON BOTH TANDEM
DRIVE UNITS AND TRIDEM DRIVE UNITS
WILL CAUSE TIRE WEAR AND SCUFFING
AND POSSIBLE DAMAGE TO THE DRIVE
UNITS. MERITOR RECOMMENDS THAT THE
TIRES BE MATCHED TO WITHIN 0.125 INCH
(3.18 MM) OF THE SAME ROLLING RADIUS,
0.75 INCH (19.05 MM) OF THE SAME ROLL-
ING CIRCUMFERENCE
Tandem Axles
The four largest tires should never be installed
on one driving axle or the four smallest tires on
the other driving axle. Such tire mounting will
cause an inter-axle ght, unusually high axle
lubricant temperatures that result in premature
lubricant breakdown and possible costly axle
service.
In addition to matching individual tire rolling
radius or rolling circumference, Meritor recom-
mends matching, as nearly as possible, the total
tire circumference of one driving axle to the total
tire circumference of the other driving axle. This
will usually result in satisfactory tandem axle
lubricant temperatures that lengthen drive unit
service with higher tire mileage.
Park the vehicle on a level surface. The vehicle
must carry a correctly distributed rated capac-
ity load. All the tires must be the same size.
Measure new tires to verify that they will be cor-
rectly matched.
1.Inatealltirestothesamepressure.
2. Carefully measure the rolling circumference
of each tire with a steel tape.
3. Mark the size on each tire with chalk and
arrange the tires in order of size, largest to
smallest.
4. Mount the two largest tires on one side of one
axle and mount the two smallest on the op-
posite side of the same axle.
5. Mount the four other tires on the other axle in
the same manner.
6. Test run the vehicle to gather accurate rear
axle lubricant temperature readings on the
two axle temperature gauges.
7 Vary tire air pressure within the tire manufac-
turer’s recommended range so the lubricant
temperature of both axles is within 30° F (14°
C) of each other and not in excess of 200°F
(93° C). This will usually result in uniform tire
loading and good tire life.
Tridem Axles
When three driving axles are used together in
a tridem series, unmatched tires will compound
the problems described in the preceding para-
graphs. Meritor recommends matching, as
nearly as possible, the total tire circumference
of each of the 3 driving axles.
To match tires on tridem units, follow the same
procedure used for tandem units.
Arrange the tires in order of size.
• Thetwolargestandtwosmallestgoononeaxle.
• Thenexttwolargestandsmallestgoonthe
second axle.
• Theremainingfourtiresgoonthethirdaxle.