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Step 6
Set the Jam Nut Torque and Remove Spanner socket (Weldment Tool)
Tighten the bolts holding the spanner socket to “snug.”
While holding the thru-shaft with the 3/4” (19mm) open end wrench through the slot in the motor
base and the spanner socket held with the thrust housing cap bolts, use a 1 1/8” (28mm) deep well
socket and a torque wrench to tighten the jam nut to 50 ft lbs. Figure 12. Make sure the thru-shaft
and 3/4” (19mm) open end wrench do not move at all during this procedure!!
Remove the thrust housing cap bolts from the spanner socket and remove it from the housing. Now
it is safe to move the thru-shaft.
WHEN LOOSENING THE SPANNER SOCKET AND SEAL NUT ONE BOLT HOLE TO SET THE BEARING PRELOAD OR WHEN
TIGHTENING THE JAM NUT, IT IS CRITICAL THAT THE THRU-SHAFT IS HELD FIRMLY WITH THE 3/4” (19MM) OPEN END
WRENCH SO THAT IT DOES NOT MOVE AT ALL. IF THE WRENCH AND THRU-SHAFT MOVE DURING THIS PROCEDURE,
THE BEARING PRELOAD WILL BE INCORRECT AND THE THRU-SHAFT MOTOR WILL NOT OPERATE PROPERLY.
IF THE THRU-SHAFT MOVES DURING WHILE SETTING THE BEARING PRELOAD, YOU MUST REPEAT STEP 5 TO ENSURE
PROPER BEARING PRELOAD.
Figure 12: Thrust housing cap bolts securing the spanner tool are snug and a torque wrench and 1 1/8” deep well socket is
used to tighten the jam nut to 50 Ft lbs.
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