Terex TS14G, Maintenance Manual

Page: 99 / 376

Section 160-0020
9
SM 1780 4-99
Rear Axle - Differential
tolerance, it will be necessary to alter, add or
remove, shims (40) between pinion cage assembly
(39) and carrier housing (26).
13. The procedures for keeping differential side
bearing pre-load, backlash and favourable gear tooth
pattern within specifications is strictly a 'try, check,
and try again' method.
14. After a satisfactory pre-load, backlash and gear
tooth pattern is obtained, make certain that pinion
bearing cage bolts (37) are torque tightened to
230 - 260 Nm (170 - 190 lbf ft). Again check backlash
tolerance and gear tooth pattern.
15. Install adjuster locks (21) and secure with cotter
pins (20).
16. Install lockwire (16) in bearing cap bolts (17).
Each pair of bolts must be tied with lockwire (16).
The lockwire passes over the top of bearing cap (19)
and through the 'V' groove in adjuster locks (21).
ADJUSTMENTS
When adjusting a noisy differential that has been in
service for some time, more harm than good can
result. Changes in adjustment will frequently
concentrate the bearing area on a small portion of the
teeth which often results in failure. Therefore, it is
advisable to know exactly what the end result will be
before adjustments are made in an old differential.
Note: A rebuilt differential or one that has not worn
excessively may be adjusted as previously
described.
The following suggestions are offered to make gear
tooth pattern analysis and identification easier.
1. Paint twelve ring gear teeth with Prussian Blue,
oiled red lead, or some other easily removed paint or
dye. When the pinion is rotated, the paint is squeezed
away by the contact of the teeth, leaving bare areas
the exact size, shape and location of the contacts.
2. Make this check by rotating the ring gear
clockwise and counter-clockwise several times.
3. Gear tooth patterns can be interpreted by referring
to Figs. 12 thru 18.
A. If a contact pattern similar to that shown in Fig. 12
is obtained, the adjustment is correct.
B. If the contact area is on the inner side of the ring
SM - 106
Fig. 12 - Proper Tooth Contact
SM - 105
Fig. 13 - Insufficient Backlash
SM - 107
Fig. 14 - Excessive Backlash
Courtesy of Machine.Market