Section 4  - Rear Axle, Universal Joints & Springs

pinion moves the tooth bearing towards the heel of the tooth, while insufficient backlash moves the tooth bearing towards the toe of the tooth.
To check the backlash use a dial indicator on the heel of a ring gear tooth. Correct backlash is from .006" to .012", Fig. 48.
To adjust the backlash proceed as follows:
If insufficient backlash—remove the double re­duction shaft bearing caps and remove a shim from the left side and add a shim of the same thickness to the right side.
If the backlash is excessive—remove a shim from the right side and add a shim of the same thickness to the left side. Continue these adjust­ments until the backlash is within limits.
Fig. 50—Axle Shift Lever and Stop Pins
made when disassembling. Tighten the bearing cap bolts just "snug."
Check the position of the double reduction gears with the double reduction pinions. Move the dif­ferential by the adjusting nuts until the double reduction gears line up with the double reduction pinions. Adjust the bearings by pulling the adjust­ing nut up tight, then backing it off one notch.
Tighten the bearing cap bolts tight and install the adjusting nut locks and then lock all bolts with tie wire.
Install the differential and carrier assembly in the axle housing, using a new gasket between the housings.
Remove the pipe plug in the pinion cage and with a lubricating gun, fill the space between the pinion bearings with one pint of lubricant.
NOTE—It will not be necessary for any further lubrication at this point while the truck is in service.
Assemble the axle shafts using new aluminum gaskets. Install the capscrew locks and capscrews, tightening them securely.
Complete the reassembly by connecting the rear universal joint. Fill the rear axle housing with 14 pints of S.A.E. 90 Mineral Oil Lubricant, "All Purpose" or "Universal" gear lubricant.
Use S.A.E. 90 Mineral Oil Lubricant, "All Pur­pose" or "Universal" Gear Lubricant. However, it is important that the proper viscosity be selected to match the seasonal temperatures. While S.A.E. 90 will provide satisfactory year around lubrica-
Fig. 49—Shifter Sleeve Yoke Shoe Clearance in Sleeve
To check the movement of the shifter sleeve, and yoke shoe clearance in the sleeve, move the shifter lever to the high-speed position and make sure the side of the sleeve is flush up against the side of the high-speed pinion. In this position the sleeve yoke shoes should have a slight side clear­ance on both sides in the sleeve recess, Fig. 49. Move the shifter lever to the low-speed position and make the same yoke shoe clearance check with the shifter sleeve flush up against the snap ring on the low-speed pinion.
Any necessary adjustments to produce proper shifter sleeve travel or yoke shoe clearance in the sleeve recess can be made by turning the shifter lever stop pins, Fig. 50, which are eccentric, with a large pair of pliers. A groove in the stop pin indi­cates the low side of the eccentric.
Lubricate the differential bearings, assemble the outer races, and install the assembly in the carrier. Then assemble the adjusting nuts and caps, using the capscrews as a guide to line up the adjusting nuts. Make sure the cap and adjusting nuts are installed according to the center punch marks





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