Track Tension (PT-70/80)
Proper track tension must be
maintained for optimal perform-
ance and track/undercarriage
life. Running a track that is too
loose may cause the track to
misfeed possibly causing dam-
age to the track and or under-
carriage components. Running
a track that is too tight may
cause track stretch, premature
bearing failure, or other prevent-
able damage to the machine. As
a rule, a track should only be
tightened to the point where
there is no visible sag. Never
tighten your tracks beyond this
point.
Note:
During the first 50 hours
of operation the tracks will
"break-in" and will most likely
require adjustment.
To check track tension: (fig. 1, 2)
1.
Drive the machine forward 5
feet to remove belt slack
from the lower and rearward
portions of the track.
2.
Lay a straight edge along
the top of the track bridging
the drive sprocket and front
idler wheel.
3.
Apply 90 lbs. of down force
to the the track by either
placing weight on top or
hanging it using rope or wire
midway between the drive
sprocket and front idler.
4.
Measure from the bottom of
the straight edge to the lug
surface (top) of the track.
The deflection should meas-
ure between 3/4" and 1".
To adjust track tension: (fig. 3)
1.
Loosen the lock nut (A) on
the turnbuckle (B) and
adjust by turning the turn
buckle itself until proper ten-
sion has been achieved.
2.
Then tighten the turnbuckle
lock nut to complete the
procedure.
3.
Repeat the adjustment pro-
cedure on the other side of
the machine if necessary.
MAINTENANCE
Undercarriages
51
1
2
Straight-Edge
3
A
B
Summary of Contents for PT-80
Page 6: ...5 ...
Page 14: ...13 ...
Page 32: ...31 ...
Page 68: ...SERVICE LOG 67 Hours Service Performed Notes ...
Page 69: ...SERVICE LOG 68 Hours Service Performed Notes ...
Page 70: ...SERVICE LOG 69 Hours Service Performed Notes ...
Page 71: ...SERVICE LOG 70 Hours Service Performed Notes ...