Power Train Disassembly & Assembly
g. Measure the diameter of bearing cage where the
cord was wound. Measure in inches or
centimeters.
h. Divide the dimension in half to get the radius.
Write down and record the radius dimension.
i. Use the following procedure to calculate the
bearing preload (torque).
•
Pounds Pulled x Radius (inches) = lb-in Preload
– Preload x 0.113 = N•m Preload
•
Kilograms Pulled x Radius (cm) = kg - cm Preload
– Preload x 0.098 = N•m Preload
or
Examples
•
Reading from spring scale = 7.5 pounds (3.4 kg)
•
Diameter of bearing cage = 6.62 inches (16.8 cm)
•
Radius of bearing cage = 3.31 inches (8.4 cm)
7.5 lb x 3.31 in. = 24.8 in•lb Preload
Preload x 0.113 = 2.8 N•m Preload
or
3.4 kg x 8.4 cm = 28.6 kg•cm Preload
Preload x 0.098 = 2.8 N•m Preload
j. If the preload (torque) of pinion bearings is not
within specifications, do the following procedure
then repeat steps a through i.
To increase preload, install a thinner bearing
spacer. To decrease preload, install a thicker
bearing spacer.
k. Inspect the bearing preload with the drive pinion
and cage assembly installed in the carrier. Follow
the procedures to adjust preload of pinion
bearings, yoke method.
Yoke Method
Observe all WARNINGS and CAUTIONS provided
by the press manufacturer concerning press
operation to avoid serious personal injury and
possible damage to components during assembly
and installation procedures.
a. Install the input yoke, nut and washer on the drive
pinion. The yoke must be seated against the outer
bearing.
NOTE : Use a press to install the yoke.
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