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Attaining proper bolt torques is essential for all fasteners that are used in the
main drive assembly – especially the six 1” NC bolts that secure the drive unit.
These are the correct bolt torques for all Grade 5 NC bolts used in the drive
assembly.
Lubricated bolt torques
1” NC 480 ft-lbs
7/8” NC 320 ft-lbs
3/4” NC 200 ft-lbs
5/8” NC 110 ft-lbs
1/2” NC 55 ft-lbs
The shaft must be bolted into the bottom first and the three 1” bolts fully torqued
to ensure the shaft is properly seated into the taper. It is essential that the three
1” bolts be torques to 480 ft-lbs as many times as necessary since the first bolt
will be loosened as the third one in torqued. Failure to follow this procedure
for both top and bottom 1” bolts will result in serious damage.
Cleanliness is of the utmost importance, especially in areas around the grease
seal rings and their surfaces. To prevent entry of moisture into the main bearing
under adverse conditions, install the gasket under the top end cap along with a
general purpose sealing compound.
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