DRIVE GP-PUMP 1359476 - Caterpillar

ALIGNING BEVEL GEAR AND PINION1. 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 SETTINGb) 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 SETTINGc) 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 SETTINGd) 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. 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.