HEXA

REAR AXLE 35 INTERPRETATION OF CONTACT PATTERN The TOE of the gear is the portion of the tooth surface at the end towards the center. The HEEL of the gear tooth is the portion of the tooth surface at the outer-end. The TOP LAND of a gear tooth is the surface of the top of the tooth. Every gear has a characteristic pattern. PATTERN INTERPRETATION (RING GEAR) FACE HOBBING DRIVE SIDE HEEL TOE CONDITION COAST SIDE TOE HEEL CONDITION ACTION REQUIRED Desirable pattern. The drive pattern should be centered on the tooth. There should be some clearance between the pattern and the top of the tooth. Desirable pattern. The coast pattern should be centered on the tooth, but may be slightly toward the toe. There should be some clearance between the pattern and the top of the tooth. None Top toe contact Top heel contact Backlash correct. Thicker pinion position shim required. Root heel contact Root toe contact Backlash correct. Thinner pinion position shim required. Top heel contact Top toe contact Pinion position shim correct. Decrease backlash. Root toe contact Root heel contact Pinion position shim correct. Increase backlash