Adjustment - Pinion Depth Measurement

ADJUSTMENT - PINION DEPTH MEASUREMENT

PINION DEPTH VARIANCE






Ring gear and pinion are supplied as matched sets. Identifying numbers for the ring gear and pinion are etched into the pinion gear face. A plus (+) number, minus (-) number or zero (0) along with the gear set sequence number (01 to 99) is on each gear. The pinion depth variance (1) is the amount the depth varies from the standard depth setting of a pinion marked with a zero. The remaining numbers are the sequence number of the gear set. The standard depth provides the best gear tooth contact pattern.





Pinion Depth Shim and Collapsible Washer


Compensation for pinion depth variance is achieved with select shims. The shims (3) are sandwiched between the pinion head bearing cup and axle housing.


If installing a new gear, note the depth variance number of the original and replacement pinion. Add or subtract this number from the original depth shim to compensate for the difference in the depth variances. The numbers represent deviation from the standard in microns. If the number is negative, add that value to the required thickness of the depth shims. If the number is positive, subtract that value from the thickness of the depth shim.

Pinion Gear Depth Variance:

PINION DEPTH MEASUREMENT


Pinion depth measurement is taken with the pinion head and tail bearing cups pressed into the axle housing without the shim.





1. Press pinion head bearing cup into housing using Handle C-4171 (1) and Installer C-4310 (2).




2. Press pinion tail bearing cup into housing using Handle C-4171 (1) and Installer D-146 (2).




3. Assemble Pinion Height Block 6739 (3), Pinion Head Bearing Cone (1), Screw 6741 (all these can be found in a Pinion Gauge Set such as 6774), and Pinion Height Gage Block 9085 (2). Install assembly into axle housing and through bearing cups.




4. Install pinion tail bearing and Cone 6740 (4). Tighten Cone 6740 by hand until 3.4 Nm (30 in. lbs.) of rotating torque is measured at Screw 6741 (5).




5. Install Arbor Discs 9083 (1).




6. Install Arbor Bar D-115-3 (1) from a Pinion Gauge Set such as 6774.




7. Verify pinion depth setup is as shown.




8. Install Dial Indicator 9524 (1) to Scooter Block D-115-2A (2) (from a Pinion Gauge Set such as 6774). Secure with set-screw (3).




9. Install Indicator/Block assembly to top of Height Block 6739 (1). Zero indicator on top surface.




10. Slide indicator probe off of height block and onto Arbor Bar D-115-3 (2). As indicator contacts Arbor Bar (2), indicator needle will rotate clockwise. Continue moving indicator probe to the crest of the arbor bar and record the highest reading.




11. Select a shim equal to the dial indicator reading plus the drive pinion gear depth variance number etched into the pinion face (1). For example, if the depth variance is -01, subtract 0.01mm (0.0004 in.) from dial indicator reading.




12. Using Handle C-4171 (2) and Remover 9084 (1), drive out pinion head bearing cup and insert specified shim.