Adjustment — Tooth Contact
PD-23prose procedureTooth Contact
Checking gear tooth contact pattern is necessary to verify correct relationship between ring gear and drive pinion. Hypoid gear set which is not positioned properly in relation to one another may be noisy, or have short life or both. With the checking of gear tooth contact pattern, the most desirable contact for low noise level and long life can be assured.
Tooth Contact Check Procedure
- 1Thoroughly clean ring gear and drive pinion teeth.
- 2Sparingly apply a mixture of powdered ferric oxide and oil or equivalent to 3 or 4 teeth of ring gear drive side.
SPD357 - 3Hold companion flange steady by hand and rotate the ring gear in both directions.
SPD308
IMPORTANT
Usually the pattern will be correct if you have calculated the shims correctly and the backlash is correct. However, in rare cases you may have to use trial-and-error processes until you get a good tooth contact pattern. The tooth pattern is the best indication of how well the final drive has been set up.
Tooth Contact Pattern Correction
Heel contact
CorrectionTo correct, increase thickness of pinion height adjusting washer in order to bring drive pinion close to ring gear.
Face contact
CorrectionTo correct, increase thickness of pinion height adjusting washer in order to bring drive pinion close to ring gear.
Toe contact
CorrectionTo correct, reduce thickness of pinion height adjusting washer in order to make drive pinion go away from ring gear.
Flank contact
CorrectionTo correct, reduce thickness of pinion height adjusting washer in order to make drive pinion go away from ring gear.
Correct tooth contact
CorrectionNo correction required.