Usage:
Direct Drive
Power Shift
Power Shift (54 Winch)
(1) Expected movement of shaft forward and back for correct bearing clearance:
Direct drive transmission ... .003 to .009 in.(0.08 to 0.23 mm)
Power shift transmission ... .001 to .007 in.(0.03 to 0.18 mm)
The movement is of a new bearing assembly.
Bevel Pinion Location
The bevel gear and pinion must be put in correct position for correct tooth contact. The pinion can be moved toward or away from center line of bevel gear and shaft. The shims (2) between the pinion shaft bearing cage and gear case are used to change the position.
If the same pinion shaft is used, use the same shims that were removed. If a new pinion shaft and, or, bevel gear is installed use the correct amount of shims to put the heel ends of pinion shaft and bevel gear in correct position.
The adjusting nuts on each bevel gear shaft bearing cage move the bevel gear toward or away from the pinion. Move either the bevel gear or pinion shaft to change backlash and tooth contact.
Bevel Gear Shaft Bearing Preload
1. Put the bevel gear into position with the approximate free movement (backlash) of .010 in. (0.25 mm). If either the bevel gear or pinion is new, the correct backlash is .005 to .011 in. (0.13 to 0.27 mm).
2. Tighten the four bevel gear shaft bearing cap bolts (3). Then loosen each bolt two turns.
3. Tighten the left bearing cage nut (4) with a 8S8303 Spanner Wrench. Turn the bevel gear shaft while the bearing cage nut is tightened to a torque of 150 to 200 lb. ft. (205 to 270 N·m). Loosen the nut. Tighten the nut (4) lightly until there is not any end play in bevel gear shaft. Tighten the nut until there is alignment for the nut lock in the next lock position.
4. Tighten the four bearing cap bolts (3). Now, follow the method for bevel gear and pinion free movement (backlash) adjustment.
Free Movement (Backlash) Adjustment
The amount of free movement (backlash) of each bevel gear and pinion group is ... .005 to .011 in.(0.13 to 0.28 mm).
1. Put the pinion in a position so it will not turn.
2. Assemble a 7H1942 Dial Indicator, 7H1945 Holding Rod, 7H1948 Snug, 8S2327 Post and 8S2329 Base. Put assembly on bevel gear case with rod of dial indicator against the face of one bevel gear tooth. This is to measure the free movement (backlash) of the bevel gear and pinion.
3. Loosen the four bearing cap bolts (3) two turns each.
4. Move the bevel gear forward and back. Read the high and low measurements shown on the dial indicator. The difference of the two measurements is the amount of free movement (backlash).
5. Do this operation at four different points (90° each) on the bevel gear circumference. The point with less free movement (backlash) is the point at which to read the measurements for the free movement (backlash) adjustment.
6. To make the free movement (backlash) less, loosen the left adjusting nut and tighten the right adjusting nut by the same amount.
7. To make the free movement (backlash) more, loosen the right adjusting nut and tighten the left adjusting nut by the same amount.
NOTE: Bevel gear shaft bearing preload must not be changed. If one adjusting nut is loosened, the other adjusting nut must be tightened the same amount. To do this, note the number of notches one adjusting nut is loosened. Tighten the other adjusting nut the same number of notches.
8. Install the locks to the adjusting nuts. If the adjusting nut must be turned to install lock, turn in direction to tighten. Tighten the four bearing cap bolts (3) to a torque of ... 200 ± 20 lb. ft.(270 ± 25 N·m)
9. Check the backlash.
10. Check heel alignment of bevel gear and pinion.
Free Movement (Backlash) And Alignment Check
1. Put Prussian blue or red lead on some of the teeth of the bevel gear. Turn pinion through this area. Check the tooth contact area.
2. Correct tooth contact starts at the toe of the tooth and goes approximately 30 percent of the length of a bevel gear tooth (5).
3. If tooth contact is more on one side of a tooth or near the heel of a tooth, the position of the pinion shaft must be changed. Add or remove shims (2) of pinion shaft bearing cage to change the position.
4. If pinion shaft position is changed, then the free movement (backlash) adjustment must be made again. Each time an adjustment is made to the pinion shaft location and free movement (backlash), Steps 1 and 2 of Backlash and Alignment Check must be done again.
5. More than one pinion shaft and free movement (backlash) adjustment is possible to get correct tooth contact and correct free movement (backlash).