Adjusting Pinion/Ring Gear General info

Adjusting Pinion/Ring Gear - General Information
Accurate adjustments of the pinion and ring gear are immensely important for the service life and smooth running of the final drive. This is why pinions and ring gears are paired during manufacture and checked in special machines for tooth pattern and quietness in both directions of rotation. The position of smoothest running is determined by moving the pinion in an axial direction, whereby the ring gear is lifted out of the no-play meshing position far enough so that the backlash will be kept within specified tolerances.
Deviation "r", in reference to master gauge "Ro", of the special testing machine used in manufacturing is measured and recorded on the outer periphery of the ring gear. Pinion and ring gear must always be replaced together.




Location of Shims
Ro -Length of master gage used in special testing machine, Ro =46.60 mm.
r - Deviation from master gage used in special testing machine in manufacturing. r is always given in 1/100 mm.

Example: "32" means r = 0.32 mm.

S3 - Shim behind head of pinion.
S4 - Shim opposite head of pinion.
Objective of adjustments must be to regain the maximum degree of quiet running, as had been determined by the special testing machine in manufacturing.




1 Mark "G 1237" means Gleason pinion/ring gear, ratio 12 : 37.
2 Matching pair number of pinion/ring gear set.
3 Deviation "r".