Second (Optional) Method

28. Install torque wrench adapter bar, as shown in Fig.

29. Install torque wrench, 0 to 50 ft. lb. scale, if avail-

183. The adapter bar can be fabricated locally to

able, and check rotating torque or rolling resistance

specifications outlined in Fig. 184. Bar illustrated

of wheel hub (Fig. 185). Rotating torque when using

will accommodate wheel hubs with planetary bolt

new bearings should be between 15 and 20 ft, lbs,

circle diameters of 12 1/2, 16 1/2, 19 1/2, and 23

On used bearings rotating torque should be between

inches.

6 and 12 ft. lbs.

CAUTION: Make certain wheel brake is in complete

release position and that it is not dragging on brake

drum.

30. If rotating torque is not to specifications given above,

remove adapter bar and tighten or loosen Inner nut

until rotating torque Is within specifications. After

tightening or loosening nut as required, rap wheel

hub several times with plastic or rawhide faced mallet

while rotating hub to seat bearings. Recheck rotating

torque as Indicated In step 29.

Second (Optional) Method

31. Attach heavy string or cord to one of wheel studs

on hub and wrap cord around wheel hub several

times attaching pound pull scale to end of cord as

shown in Fig. 186. Tighten inner nut until rotating

torque measured on pull scale is between 21 and 28

lbs. for new bearings and between 9 and 17 lbs. for

used bearings.

NOTE: Bearing preload rotating torque, using a

pound pull scale, is figured by multiplying the radius

(distance from center of wheel to outside diameter of

wheel hub) by the reading on the pull scale and

dividing by 12 to arrive at ft. lbs. of torque. For ex.

ample: Wheel hub radius of 8-5/16 Inches times 24