30508
37666
Figure 76
Figure 77
The case and relevant covers shall not show cracks.
The faying surfaces between case and covers shall not be dam-
aged nor warped.
The seats of bearings and that of the R speed transmission gear
shall not be damaged nor too much worn out.
The covers shall not show cracks and the coupling surfaces
shall not be warped nor damaged; the roller bearings shall not
rotate in their seats; the assembling clearances of the shafts
shall not be excessive; the shafts and relevant conrol compo-
nents, the pawls, the spacer and the levers shall not be too
much worn out and the springs shall not be broken nor have
loosed proper flexibility.
GEAR SHAFTS
Check wear of synchronizer rings and relevant coupling el-
ements by operating as follows:
set the synchronizer ring (1) on the coupling element (2);
rotate the components to ensure proper coupling;
use a feeler gauge (3) at two opposite points to find gap X be-
tween the coupling element and the synchronizer ring. If the
value X found is less than 0.8 mm for the gearbox, or less than
1.2 mm for the E.R.U., replace the synchronizer ring and/or the
coupling element.
Use driver 993701131 (1) to disassemble the roller bearing
(2) and then fit in place the new one.
The bearing seats in the shafts shall not be damaged nor worn
out. Toothing of gears shall not be damaged nor worn out.
HUBS, SLIDING SLEEVES AND FORKS
The splines on hubs and relevant sliding sleeves shall not be
damaged. The sliding sleeve move on the hub shall be free.
The sliding sleeve dowels shall not be damaged nor worn out.
The forks shall be free from damages or defects and the back-
lash of relevant sliding shoes in the radial race of the sliding
sleeve shall not exceed 1 mm.
BEARINGS
The roller bearings or roller cages shall be in perfect conditions
and not show traces of wear or overheating.
While keeping the bearings pressed with your hand, make
them rotate to both directions at the same time: the move-
ment shall not be affected by binding or noise.
!
At assembling stage, always replace the safety plates
and rings, the spring washers, the sealing rings and
gaskets, the springs of the sliding sleeve dowels and
all other springs that are showing having lost the re-
quired elasticity. Also replace the spring caps, the self-
locking nuts and all those parts not perfectly efficient,
scored, cracked or warped.
Before installing the two-lip sealing gaskets, fill the gap
between the two lips with TUTELA MR3.
!
At assembling stage, do not mistake the components
with each other.
ASSEMBLING THE GEARCHANGE CASE
32
GEARBOX ZF 9 S 109 D.D.
S
TRALIS
AT/AD
Base - January 2003
SYNCHRONIZERS AND COUPLING ELEMENTS
CASE AND COVERS