Spicer Tandem Drive Axle Dual Range & Double Planetary 34,000-45,000 lbs - Manual (Page 22)

Adjustments
Adjust Pinion Bearing Preload for Axles with
ñSlip-fitî Outer Pinion Bearings
1.
Lubricate bearings and assemble the drive pinion, bearings, and
pinion bearing cage as recommended in the assembly section of this
manual. Use the pinion bearing spacer removed from the axle during
disassembly. If the original spacer cannot be used, install the nominal
spacer recommended in the adjacent chart.
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 bearings. Install the yoke (or helical
gear) and torque the nut to specification or use a press to simulate nut
torque by applying pressure to the assembly (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 outer pinion bearing.
3.
Measure Pinion Bearing Preload - Use a spring scale to test the
assembly rolling torque. To use the spring scale, wrap a 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
Bearing Preload Test
("Press-fit" Outer Pinion Bearing)
Axle Models
Forward Axles
D340, 380(P),
400-P
D341, 381 (P),
401-P, 402(P),
451-P
Rear Axles
(all models)
Nominal Pinion
Bearing Spacers
Spacer Thickness
Axle Model in. mm
Forward Axles
D340, 380(P), 400-P
D341, 381(P), 401-P,
0.638 16.205
402(P), 451-P 0.492 12.497
Rear Axles
(all models) 0.638 16.205
Measuring Bearing Preload with
Pinion in Vise.
Measuring Bearing Preload with
Pinion in Press.
Nut Torque Press Loads
Ft-lbs. N.m Tons Metric Tons
SELF-LOCKING NUT
I
560-700 759-949 13.5-15.5 12.2-14.0
SELF-LOCKING NUT
780-960 1057-1301 17-19 15.4-17.2
SLOTTED NUT & ROLL PIN
840* 11 39* 17-19 15.4-17.2
METRIC NUT (After 7-1-95)
840-1020 1140-1383 17-19 15.4-17.2
560-700 759-949 14-15 12.7-13.6
METRIC NUT (After 7-1-95)
575-703 774-955
Spring Scale Reading
(without pinion seal)
(for 15-35 in-lbs. torque)
(1.7-4 N.m)
lbs. kgs.
5-12 2.3-5.4
5-12 2.3-5.4
5-12 2.3-5.4
6-14 2.7-6.4
*Torque nut to 840 ft-lbs. (1.139 N´m), then continue tightening nut to align nut slot to nearest hole in pinion shank.
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