Adjust Pinion Bearing Preload (Without Press) - JLG GRADALL 522D Owner's/Operator's Manual

Se c t ion 4
Asse m bly a nd I nst a lla t ion
9. Install outer bearing cone on pinion shaft against
spacer. Figure 4.16.
NOTE
Do not install pinion oil seal in bearing cage
before bearing preload adjustment. Continue
adjusting preload of pinion bearings.
10. Press outer cone bearing with 10 ton force and
check preload of bearings. Figure 4.16.
Adjust Pinion Bearing Preload
(Without Press)
NOTE
•
If the preload value is below the specified
range, install a thinner bearing spacer.
•
If the preload value is over the specified range,
install a thicker bearing spacer.
Calculation Example:
Data:
Radius: 9.3 cm (3.65 in)
Load: 2.3 Kg (5.0 lbs)
Calculation Procedure:
2.3 Kg x 9.3 cm = 21.4 Kg-cm
5.0 lb x 3.65 in = 18.25 lb-in.
Conversion to N•m:
21.4 x 0.098 = 2.1 N•m
18.25 x 0.113 = 2.1 N•m
NOTE
•
To convert lb-in to N•m:
multiply by 0.113
•
Kg-cm to N•m:
multiply by 0.098
1. Lubricate bearing cups and cones with
specified oil.
2. Install yoke or flange without pinion oil seal.
3. Install pinion bearing cage assembly on main
housing without bearing cage shims.
4. Fasten bearing cage assembly on main housing
with two capscrews. Apply minimum specified
torque of 67 lb-ft (90 N•m).
28
T
5. Use appropriate tool to fasten pinion through
yoke, flange or splined sleeve. Figure 4.17.
Figure 4.17
6. Tighten pinion nut with minimum torque value of
465 lb-ft (630 N•m).
T
7. Rotate pinion bearing cage several times so
bearings make normal contact.
8. Attach torque wrench on drive pinion nut. Rotate
pinion and check if preload is in specified range.
Make the reading during the rotation, not the
starting value. Figure 4.18.
Figure 4.18
9. If the pinion bearing preload torque value is under
or above the specified preload torque of 5-20 lb-in
(0.55-2.2 N•m), change shims to thick or thinner
size as necessary. Repeat pinion bearing
preload check.
T
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