Power Train Disassembly & Assembly
Adjusting Preload of Pinion
Bearings
Specifications
• New pinion bearings – torque
– 5 to 45 lb-in (0.56-5.08 N•m)
• Used pinion bearing in good condition – torque
– 10 to 30 lb-in (1.13-3.39 N•m)
Press Method
NOTE : If a press is not available, or the press does
not have a pressure gauge, use the yoke method to
adjust pinion bearing preload.
a. Place the drive pinion and cage assembly in a
press, gear head (teeth) toward the bottom.
b. Install a sleeve of the correct size against the
inner race of the outer bearing.
c. Apply and hold the correct amount pressure to the
pinion bearings. (Press pressure needed on
bearings for correct preload : 54,000 lbs (24,494
kg)). As pressure is applied rotate the bearing
cage several times so that bearings make normal
contact.
d. While pressure is held against the assembly, wind
a cord around the bearing cage several times.
e. Attach a spring scale to the end of the cord.
f. Pull the cord with scale on a horizontal line. As the
bearing cage rotates, read the value inducated on
scale. Write down and record the reading.
NOTE : Do not read starting torque. Read only the
torque value after the cage starts to rotate. Starting
torque will give a false reading.
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