SECTION 58 - DRIVELINES - CHAPTER 2
58-9
During assembly of the bevel gearbox, it is important
to be aware that all bearings, except for the front input
shaft bearing, 1, are “low tolerance” bearings to
provide a specific stack height. These low tolerance
bearings, in conjunction with the use of precision
forged gears and precision machining of the gearbox
housing, have eliminated the need for backlash
adjustments during repair of the gearbox. The
backlash in the assembled gearbox should be
between 0.005 inch and 0.011 inch; hold the input
shaft steady with one hand, and carefully rotate the
output bevel shaft back and forth with the other hand.
You should hear and feel a small amount of
movement between the two gears.
If no backlash is detected after gearbox repair with
new parts, recheck the gearbox for correct assembly
of all components.
NOTICE: The low tolerance bearings are carefully
machined for a specific “stack height.” Do not mix old
and new bearing components or substitute with
“jobber” bearings.
1. Pack the input shaft bearing cones and the lower
output shaft bearing cone with grease prior to
installation, to ensure adequate lubrication at
start-up.
NOTICE: Ensure the lower output shaft bearing is
thoroughly packed with grease, or bearing failure
may occur.
600-4-13
1
18
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