biodex 950-275 Installation & Operation Manual page 22

CONTENTS
If belt speed remains constant, this indicates belt is tight. If belt hesitates during heel strikes,
additional tightening is required. To check over tightening, set treadmill .5 mph and, while hold-
ing rail, resist until belt stops. If drive roller continues to rotate with the belt stopped, further
adjustment is not necessary. If drive roller stops when belt is stopped, belt is too tight. Loosen
belt and recheck.
Tracking
Tracking adjustment is necessary when a pronounced bump appears toward the left side of the
belt, approximately two inches from the left edge. This occurs when the belt works its way out
of the Exact-Track grooves.
To Adjust Treadbelt Tracking:
Tighten the hex tensioning bolt on the side to which the treadbelt has migrated, turn bolt in 1/8
increments clockwise. The treadbelt should slowly move away from the tightened bolt. Once
belt migrates back into roller slot the bump will disappear. At this point, fine tracking adjust-
ment is necessary.
Fine Tracking
Fine tracking adjustment prevents premature wear of the tacking belt rib which rides in the
Exact-Track groove. The belt rib should be centered in the tracking groove. If the rib rides
against the groove wall, a friction point forms causing excessive wear. This adjustment should
be made during preventative maintenance or during belt replacements.
To Adjust Fine Tracking:
Determine which side of the exact track groove the belt rib is riding on. Mark treadbelt tracking
position on deck.
Tighten the hex tensioning bolt on the side the belt is tracking against, belt should migrate to the
opposite side of the groove. Mark the treadbelt tracking position on the deck. You now have two
marks on the deck 1/4" apart. Mark the center position of the marks. This is where the belt
should track. Adjust 9/16 tensioning bolt so that the belt is centered on the mark. Remember the
belt will migrate away from the tension bolt that is adjusted last. Tracking adjustments are done
in forward direction only, at 8 mph.
Check tensioning after adjustment to insure proper belt performance and wear.
NOTE: Motor drive belt should never slip. Check this when you check for tread belt overtightening. If
tread belt drive roller is stopped, motor should also stall. If motor turns, but drive roller is stopped, tight-
en motor tension bracket located under the mill. Adjust until the motor belt stops slipping.
MAINTENANCE — 22 —