Quantcast PRE-LOAD CHECK OF BEARING (Cont) - TM-55-1905-220-14-60834

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TM 55-1905-220-14-6
3-166.3 IDLER GEAR AND BEARING ASSEMBLY - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
PRE-LOAD CHECK OF BEARING (Cont)
(2)
Install the center bolt and washer through the gear hub and thread into the cynder block a 1/2-13
il
inch x 2 1/2 inch bolt, (replacing the 1/2-13 inch x 2 inch bolt). Tighten the bolt to 80-90 lb. ft.
(108.5-122.Nm) torque.
(3)
Place a steel plate (lower plate) against hub and bearing. Insert three 3/8-16 inch bolts through
plate and threaded into hub. Tighten the bolts to 25-40 lb. ft.33.9-54.2 Nm) torque.
(4)
Tie one end of a piece of lintless 1/8 inch cord around a 1/8 inch round pieceof wood (or soft
metal stock). Place the wood between the teeth of gear, then wrap the cord around the periphery
of the gear several times. Attach the other end of the cord to a spring scale. Maintain a straight,
steady pull on the scale, 90 to the axis of the hub, and note the pull, in pounds and ounces,
required to start the gear rotating. Make several checks to obtain an average reading. If the pull
is within 1 1/4 lb. minimum to 6 lbs. 12 ounces maximum and does not fluctuate more than 2
lbs. 11 ounces, the idler gear and bearing assembly are satisfactory for use.
3-2809


 


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