DRESSTA TD-25M EXTRA, Service Manual

Page: 562 / 595

SECTION 15
TRACKS OR WHEELS
Page 16
TD-25M EXTRA DRESSTA
TRACK CHAIN
Rotating the Track Pins and Bushings
As internal and external wear on track pins and bushings develop, the tracks actually get longer
and the separations between the parting edges of the links become greater. This gradual wear, in
time, produces excessive stretch in the track assembly and requires that the idler be adjusted
forward to maintain the proper track tension. Improperly adjusted tracks, either too tight or too
loose, affect the rates of wear on all track parts such as pins, bushings, links, etc.
Since wear occurs on one side of the link pins and bushing (Fig. 15.20), the track pins and
bushings can be reversed to obtain additional service from the track. To do this, press out all the
track pins and bushings. Rebuild the track chain, pressing the pins and bushings in so that they are
turned 180 degrees (1/2 turn). Follow the instructions furnished with the track pin press and
installing tool.
The unworn surface of each pin is operating against the unworn surface in its bushing and the
unworn outside surface of the bushing which contacts the sprocket.
Fig. 15.19. Assembly of New Links
1. Master Bushing
2. Standard Pin
3. Spring Seal Washers 4. Spacer
5. New Link or Links
6. Aligning Pin