Spicer Tandem Drive Axle Dual Range & Double Planetary 34,000-45,000 lbs - Manual (Page 21)

Final Pinion Bearing Preload Test
1.
Assemble the complete pinion bearing cage unit as recommended
in the assembly section of this manual.
NOTE:
Forward axle pinion is equipped with helical gear. For easier
disassembly during bearing adjustment procedure, use a dummy yoke
if available) in place of helical gear.
.
2.
Apply clamp load to the pinion bearing cage assembly. Either install
the yoke (or helical gear) and torque the pinion nut to specifications or
use a press to simulate nut torque (see chart below).
Vise Method
- If the yoke and nut are used, mount the assembly in a
vise, clamping yoke firmly.
Press Method -
If a press is used, position a sleeve or spacer so that
load is applied directly to the back-face of the outer bearing cone.
.
3. Measure Pinion Bearing Preload -
Use a spring scale to test the
assembly rolling torque. To use the spring scale, wrap soft wire around
the bearing cage, attach the scale and pull. Preload is correct when
torque required to rotate the pinion bearing cage is from 15 to 35 inch
pounds. This specification is translated into spring scale readings in the
chart below.
4. Adjust Pinion Bearing Preload -
If necessary, adjust pinion bearing
preload. Disassemble the pinion bearing cage as recommended in this
manual and change the pinion bearing spacer. A thicker spacer will
decrease preload. A thinner spacer will increase preload.
IMPORTANT:
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.
Specifications for Final Pinion Spring Scale Reading
Bearing Preload Test (without pinion seal)
("Press-fit" Outer Pinion Bearing) (for 15-35 in-lbs. torque)
Nut Torque Press Loads
(1.7-4 N.m)
Axle Models Ft-lbs. N.m Tons Metric Tons lbs. kgs.
Forward Axles SELF-LOCKING NUT
D340, 380(P),
400-P 560-700 759-949 13.5-15.5 12.2-14.0 5-12 2.3-5.4
D341, 381(P), SELF-LOCKING NUT
401-P, 402(P), 780-960 1057-1301 17-19 15.4-17.2 5-12 2.3-5.4
451 -P
SLOTTED NUT & ROLL PIN
840* 1139* 17-19 15.4-17.2 5-12 2.3-5.4
METRIC NUT (After 7-1-95)
840-1020 1140-1383 17-19 15.4-17.2
Rear Axles
(all models) 560-700 759-949 14-15 12.7-13.6 6-14 2.7-6.4
METRIC NUT (After 7-1-95)
575-703 774-955
*Torque nut to 840 ft-lbs. (1139 N´m), then continue tightening nut to align nut slot to nearest hole in pinion shank.
21