Service Manual D__R440, 460, 480, D_R461, 462, 463, 521, 581, 601, 651, 652, 653 Owner manual

63
Drive Pinion
Drive Pinion
Specifications for Pinion Bearing Final Buildup
Preload Test
Torque to Rotate Bearing Cage (w/o pinion seal)
15-35 lbs. in.(1.7–4.0 N•m)
Vise Method
a. If the yoke and nut are used, mount the assembly
in a vise, clamping yoke firmly.
Press Method
a. If a press is used, position a sleeve or spacer so
that load is applied directly to the backface of the
outer bearing cone.
6. Measure Pinion Bearing Preload: Use a spring scale
to test the assembly rolling torque. To use the spring
scale, wrap flexible wire around the bearing cage, at-
tach the scale and pull. Preload is correct when
torque required to rotate the pinion bearing cage is
from 5–12 lbs.
Read only the torque value after the bearing cage starts to
rotate.
7. Adjust Pinion Bearing Preload: If necessary, adjust
pinion bearing preload. Disassemble the pinion bear-
ing cage as recommended in this manual and change
the pinion bearing spacer. A thicker spacer will de-
crease preload. A thinner spacer will increase pre-
load.
Use the correctly sized spacer. Do not use shim stock or
grind spacers. These practices can lead to loss of bearing
preload and gear or bearing failure.
8. Press pilot bearing on pinion.
To prevent bearing damage, use suitable sleeve that only
contacts the inner race of bearing con.e
Forward Axles Rear Axles
Spring Scale
Reading
5 - 12 lbs.
(2 - 5 kgs.)
Press Loads 18 - 21 tons
(16.3 - 18 metric tons)
Nut Torque 980 lbs. ft.*
(1,329 N•m)
840 - 1,020 lbs. ft.
(1,139 - 1,383 N•m)
*Torque nut to 980 lbs. ft. (1,329 N•m), then continue
tightening nut to align nut slot to nearest hole in pinion
shank.
1 - Vise
1 - Press
1
1
CAUTION
IMPORTANT
IMPORTANT