驱动桥5000字外文翻译文献

As the bearing cage rotates, read the value

7. indicated on the scale.

Preload normally is specified as torque re-8. quired to rotate the pinion bearing cage, so take a reading only when the cage is rotating. Starting torque will give a false reading.

To calculate the preload torque, measure the 9. diameter of the bearing cage where the cord was wound. Divide this dimension in half to get the radius.

10. U se the following procedure to calculate the

bearing preload torque:Standard.

Pull (lb) 3 radius (inches) 5 preload (lb-in.)or

Preload (lb-in.) 3 0.113 (a conversion constant) 5 preload (N .m)

Install the yoke, flat washer, and nut. Tighten 6. the nut snugly. Tap the end of the input shaft lightly to seat the bearings.

Measure the input shaft endplay again with 7. the dial indicator. If endplay is still incorrect, repeat steps 3 through 7.

With the endplay correct, seal the shim pack 8. to prevent lube leakage. Then torque the i nput shaft nut and cover capscrews to the correct value.

24.5 A XLE ADJUSTMENTS

AND CHECKS

This section introduces the differential carrier adjust-ments, checks, and tests that the truck technician must be capable of performing; some have been

r eferred to previously in the text. For the most part, the procedures described here are general in nature. The truck technician should refer to OEM service

l iterature for specific procedures.PINION BEARING PRELOAD

Most differential carriers are provided with a press-fit outer bearing on the drive pinion gear. Some older rear drive axles use an outer bearing, which slips over the drive pinion. The procedures for adjusting both types follow.

Press-Fit Method Adjustment

To adjust the pinion bearing preload using the press-fit method, use the following procedure:

Assemble the pinion bearing cage, bearings, 1. spacer, and spacer washer (without drive pin-ion or oil seal). Center the bearing spacer and spacer washer between the two bearing cones (Figure 24–49).

When a new gear set or pinion bearings are 2. used, select a nominal size spacer based on OEM specifications. If original parts are used, use a spacer removed during disassembly of the drive.

Place the drive pinion and cage assembly in a 3. press, with the gear teeth toward the bottom.Apply and hold the press load to the pinion 4. bearing. As pressure is applied, rotate the bearing cage several times so that the bear-ings make normal contact.

While pressure is held against the assembly, wind 5. a cord around the bearing cage several times.Attach a spring scale to the end of the cord 6. (Figure 24–50). Pull the cord with the scale on

a horizontal line.

FIGURE 24–49 Assembly of the pinion bearing cage.

(Courtesy of Dana Corporation)

FIGURE 24–50 Cage in press to check bearing

p reload.

Sleeve must apply