SUBJECT: 725, 730, 730 EJECTOR & 735 Articulated Trucks, Pinion Locknut for Field Service

PROBLEM:

SOLUTION:

INSTALLATION PROCEDURE:

1. Ensure that the input pinion bearings are adequately lubricated with oil then install the new locknut.
2. Tighten the locknut against the washer. Rotate the pinion several times while tapping the top of the pinion gently with a soft mallet to ensure that the bearings are fully seated. It may be necessary to tap both ends of the pinion shaft to ensure that the bearings are fully seated.
3. Continue to tighten the locknut until the rolling torque for the pinion is approximately 2.25 Nm (20 lb in). Rotate the pinion several times while tapping the splined shaft side with the soft mallet until the rolling torque is maintained at 2.25 Nm (20 lb in).
4. Loosen the locknut.
5. Re-tighten the locknut until the rolling torque is between 0.67 Nm (5.93 lb in) to 1.35 Nm (12 lb in). Rotate the pinion several times while tapping the shaft with the soft mallet until the rolling torque is maintained in the 0.67 Nm (5.93 lb in) to 1.35 Nm (12 lb in) range.

NOTE: The torques that are specified are for new bearings. For used bearings, limit the applied torque to one-half of the specified torque, 0.67 Nm (3.00 lb in) to 0.67 Nm (5.93 lb in).

6. Recheck the rolling torque. While measuring the rolling torque, make sure it does not "spike" or increase over 1.35 Nm. If there are spikes over 1.35 Nm (12 lb in) go back to Step 5 and use a smaller rolling torque value.
7. Tighten the four locking bolts to 30+/-7 Nm (22+/-5 lb ft). Tighten the bolts at least twice to ensure that the torque has been maintained on all four bolts. Measure the rolling torque.