Terex TS14G, Maintenance Manual

Page: 97 / 376

Section 160-0020
7
SM 1780 4-99
Rear Axle - Differential
(840 - 1 020 lbf ft). Tighten nut while rotating bearing
cage in both directions to ensure normal bearing
contact. Refer to Fig. 9.
9. If inner and outer cones (29 & 35) should start to
seize as nut (32) is being tightened, the assembly
must be taken apart enough to permit removal of
washers (31) and new washers which have a greater
total thickness, installed and reassembled as
described in Step 8.
10. With the bearings lightly oiled, there should be a
noticable drag or preload on the pinion bearings when
yoke nut (32) is tightened to the torque specified.
Note:
The preload should be held within a torque
range of 2 -4 Nm (15 - 35 lbf in), lubricated.
11. To check pre-load torque, place pinion gear (28)
in a soft-jawed vice, yoke (33) up. Wrap several
turns of soft wire around body of cage (39) and form
a small loop at the free end. Insert the hook of a
suitable spring scale into the wire loop and pull on a
line tangent to the outer flange face. Refer to Fig. 10.
The scale reading should be taken while cage (39) is
being rotated. The starting torque may be higher and
therefore misleading, depending upon the tightness of
the bearings.
Fig. 10 - Checking Bearing Preload
SM - 2180
The pull in Newtons (lbf) as indicated by the scale,
multiplied by the cage body radius in metres (inches)
(measured at the point where wire was wrapped)
equals the Newton metres - Nm (lbf in) of torque.
For example: if the cage body radius is 0.103 18 m
(4.0625 in) and the scale pull registered 40.03 N
(9 lbf), then 0.103 18 x 40.03 = 4.13 Nm
(4.0625 x 9 = 36.5625 lbf in) torque. This is 0.18 Nm
(1.56 lbf in) over the high limit. The bearing preload
would be too great.
If the preload is too much, use a combination of two
washers (31) that is thicker. If the preload is not
enough, use a combination of two washers that is
thinner.
Continue checking the preload and changing washers
as required until the proper fit of 2 - 4 Nm
(15 - 35 lbf in) is obtained, with the bearings and
washers under the full torque specified for nut (32).
12. Remove nut (32) and remove yoke (33) from
pinion gear (28). If any difficulty is experienced
removing the yoke use a suitable puller, DO NOT
hammer the yoke.
13. Install seal (34) into bearing cage (39).
14. Install yoke (33) on pinion gear (28) shaft.
Fig. 9 - Installing Yoke
SM - 2179
Courtesy of Machine.Market