Usage:
Typical Example
1. Put the bevel gear in position at the approximate gear clearance (backlash).
NOTE: The gear clearance is .008 ± .003 in. (0.20 ± 0.08 mm).
2. Tighten the bearing cap bolts (3), then loosen them two turns.
3. Make alignment of the notch on the cage nut (2) with the lock. Tighten the cage nut (1) with tool (A) to a torque of 175 ± 25 lb.ft. (240 ± 35 N·m). Loosen cage nut and tighten again until there is a small amount of preload. Tighten one notch more to make an alignment with the lock.
Typical Example
4. Put tooling (B) in position as shown. Use a wood block to stop the bevel gear from turning. Put the finger of tooling (B) on a gear tooth of the bevel pinion shaft. Turn the bevel pinion shaft backward and forward and check the indications. The difference in the indications is the amount of gear clearance (backlash). Check the indications in four positions on the bevel gear. The smallest indication is used for the gear clearance (backlash) dimension.
a) If the indication is too large at the position of the smallest dimension, loosen nut (1) with tool (A) and tighten nut (2) the same amount nut (1) was loosened.
b) To increase the amount of gear clearance (backlash), use tool (A) and loosen nut (2). Tighten nut (1) the same amount nut (2) was loosened.
NOTE: The bearing preload will be the same if both nuts (1) and (2) are turned the same aount.
c) Turn nuts (1) and (2) until the nearest notch in both nuts are in alignment with the two locks.
5. Tighten the four bolts that hold the bearing caps in position.
Location Of The Bevel Pinion Shaft
Aligning Bevel Gear And Pinion
1. After bevel gear bearing preload and gear clearance (backlash) adjustments have been made, check the tooth contact setting between the bevel gear and bevel pinion shaft as follows.
a) Put a small amount of prussian blue, red lead or paint on the bevel gear teeth. Turn the bevel pinion shaft and check the marks made on the bevel gear teeth.
Correct Tooth Contact Setting
b) With no load, correct tooth setting will be shown. The area of contact starts near toe of gear and goes 30% up the length of the tooth. With this setting, when load is put on the gear it will be over the correct area of teeth.
Short Toe Contact Setting
c) If the bevel pinion shaft is too far away from the bevel gear, short toe contact will be the result as shown. The teeth of the bevel pinion shaft will be in contact with toe ends of convex faces (part that makes a curve toward outside), and top edge of heel end of concave faces (part that make a curve inside). To correct this, add shims between bevel pinion shaft and bearing cage of transmissions. Check gear clearance (backlash) and tooth contact again.
Short Heel Contact Setting
d) If the bevel pinion shaft is too near to the center of the bevel gear, short heel contact will be the result as shown. The teeth of the bevel pinion shaft will be in contact with the toe ends of concave faces (part that makes a curve toward the inside) and the heel ends of convex faces (part that makes a curve toward the outside). To correct this, move the pinion shaft away from the bevel gear by removing shims between the bearing cage of the transmission and bevel pinion shaft. After doing this, check the gear clearance (backlash) and tooth contact again.
NOTE: Several adjustments must be made for the correct tooth contact setting. If the gear clearance (backlash) is changed, the tooth contact setting will change.
2. Remove all of the prussian blue, red lead or paint from the bevel gear and bevel pinion shaft.