MAINTENANCE OF TRACK AND TRACK
Some maintenance of track and track frames are
performed at the jobsite by the field maintenance crew.
This maintenance consists of track adjustment,
lubrication based on hours as required by the
manufacturer, and inspection of the track and track
If the tracks are adjusted too tightly, there will be
too much friction between the pins and bushings when
the track links swivel. as they travel around the
sprocket and front idler. This friction causes the pins,
bushings, links, sprocket, and idler to wear rapidly.
Friction in a tight track also robs the tractor of needed
Tracks that are too loose fail to stay aligned and
tend to come off when the tractor is turned. As a result,
the idler flanges, roller flanges, and the sides of the
sprocket teeth wear down. A loose track will whip at
high tractor ground speed, damaging the carrier rollers
and their supports. If loose enough, the drive sprockets
will jump teeth (slide over track bushings) when the
tractor moves in reverse. Should this happen, the
sprocket and bushings will wear rapidly.
One method for determining proper track tension
is placing a straightedge over the front carrier roller
and idler with all the slack removed from the rest of the
track. Using a ruler. measure from the top of the track
shoe to the bottom edge of the straightedge (fig. 6-28).
For the correct measurement, refer to the
If it becomes necessary to adjust the track in the
field, the following method can be used. Remove all
Figure 6-28.Checking track adjustment.
slack from the track. With all slack removed, release
the pressure until the front idler moves back 1/2 inch.
This will provide the required slack in the track until
the tractor can be readjusted to the manufacturers
Always check the manufacturer's
maintenance manual for the proper procedures
when adjusting tracks.
The track pins and bushing are hardened and
require no lubrication. Many rollers and idlers are
equipped with lifetime seals that are factory
lubricated and sealed. However, track rollers, carrier
rollers, and idlers equipped with grease fittings must
be lubricated on a scheduled basis that is set by the
ONLY use a hand-operated grease gun on
these fittings and pump only until resistance is
felt. Further pumping will damage the seals.
When performing routine maintenance, inspect
the complete track and undercarriage for signs of
abnormal wear, leaking rollers or idlers, and
misaligned, loose, or missing parts. Should you find
any loose track shoes, you should check the torque on
all the shoe bolts. Any bolts not meeting specifications
should be retightened to the prescribed torque.
If the track appears to be out of alignment, report
this to your supervisor who shall determine what
action is required. Leaking roller and idler seals should
be replaced as soon as possible to prevent any further
damage to the equipment.
Repairs made to tracks and track frames in the
maintenance shop are usually limited to replacing
roller or idler seals and bearings or repairing a
hydraulic track adjuster. On occasion, you may find a
roller or track that is badly worn and requires