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The main service concerns of the Middle
Gear
Case assembly are:
(1) Gear Lash: The play between the gear
teeth. This can be adjusted by shimming.
(2)
Tooth Patterns: The locations and
terns of contact that are made on the gear
teeth. This can be adjusted by shimming.
(3)
Bearing Clearance: The distance between
a bearing and i ts bearing housing cap.
is
This
an extremely small clearance that
must be carefully adjusted by shimming.
Gear
(4) Bearing Preload: The
tapered roller bearings against their races.
In this case it is measured as the torsional
resistance of the driven pinion bearings. I t
is usually adjusted by replacing the
Expansion Spacer and very carefully
adjusting the torque on the special nut.
set load forcing
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