SECTION 15 TRACKS OR WHEELS
Page 2
TD-25M EXTRA DRESSTA
TRACK CHAIN
Track chain tension:
Dry sealed tracks:
in normal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 - 38 [mm]
in mud or snow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 - 50 [mm]
Lubricated tracks:
in normal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 - 64 [mm]
in mud or snow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 - 76 [mm]
Special Bolt Torque Data
(Torques given are for bolts and nuts lubricated with SAE-30 engine oil)
NOTE: Except for the special torques shown all bolts and nuts are to be given a standard torque.
Refer to SECTION 1.
Track Shoe
Track shoe and split link bolts
Mounting moment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 650 ± 70 [Nm] + 120 [°]
of turn
Checking moment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1100 [Nm]
4. SERVICE DIAGNOSIS
For service diagnosis of the tracks refer to SERVICE DIAGNOSIS in SECTION 14.
5. MAINTENANCE
The track links have only one wearing surface which contacts the track rollers, front idler and track
idlers. However, it usually becomes necessary to replace pins and bushings before the links wear
out, and it is a matter of judgement then whether the links are good enough to justify a new set of
pins and bushings. Only the wear on the outside of the bushings is visible. Wear on the pins and
interior of the bushings is indicated by track ”stretch” (forward adjustment of the front idler).
The amount of wear can be determined by measuring the pitch length of the track (distance
between centers of pins) under tension and comparing it with the new and maximum allowable
pitch lengths listed in Paragraph 3, SPECIFICATIONS in this Section.
Sprocket wear must also be considered in conjunction with track chain wear. Wear of the sprocket
teeth decreases the pitch length of the sprocket, while wear of pins and bushings increases the
pitch length of the track. The results are that the pitch lengths of the sprocket and track become
more and more out-of-phase, and the bushings ride higher on the sprocket teeth. Combined wear
of sprocket and track should never be allowed to reach this point as spinning of the sprocket may
result and cause serious breakage. Whenever new or rebuilt chains are installed, the sprocket rims
should also be replaced or interchanged to present the better side of the teeth to the bushings.
Never remove one link to bring a ”stretched” track to within the range of proper track adjustment.
A track that is worn badly enough to take up the length of one link, will be so far out of pitch that
the increased wear on the sprocket will far more than offset the saving obtained by the removal of
one link in the track chain. Refer to Rotating the Track Pins and Bushings in Paragraph 7,
TRACK CHAIN REPAIR.
Improper track tension and loose track shoes will cause damage and premature wear to the track.
Periodically inspect the track shoe bolts. If necessary, install new bolts and tighten to the proper
torque (Fig. 15.2). Inspect the tension of the track chain, and tighten if necessary (Fig. 15.1).
When new tracks or track shoes are installed, the track tension and track shoe bolts must be
checked after first 10 hours of operation and adjusted if necessary.
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