Control And Tightening Of The Driving Belt (Poly-V Belt System); Checking The Tension Of The Driving Belt With The "Slipping-Test - h/p/cosmos 150/50 Operating And Service Manual

The adjustment procedure is finished if the running belt stays in the centre of the rear roller (tail shaft) after having
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been operated at a speed of 12 km/h for at least 4 min.
Uphill run and other running styles may lead to locomotion of the running belt. +/- 2 cm are to be considered as a
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tolerance zone. As long as the running belt returns to the centre at a speed of
12 km/h, it must not be readjusted. The running belt will remain in the
adjusted position for a period of months if it has been adjusted correctly.
During "reverse belt rotation" (downhill run), a re-adjustment of the belt
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position (centring) is required.
By evenly turning the left and right trimming screws to the right, the running
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belt can be tightened if necessary. See chapter „running belt tension".
Note: For running machines with a running surface of 200 x 75 cm and bigger, the trimming screw is located at the front
deviation shaft.
The allen key must be pulled out of the screw immediately after use due to risk of injury!
The oversize machine h/p/cosmos saturn 450/300rs has an automatic belt centring system with motors and sensors and
does not need to be centred manually; however, the user should observe the central belt position.

8.7 Control and tightening of the driving belt (poly-V belt system)

The correct tension of the driving belt is very important for proper operation of the running machine. If the tension is too
high, this may cause defects of the motor and roller bearings. Too low tension results in the backlash of the drive belt
and therefore in higher abrasion and power losses.
The poly-V belt is provided with a belt adjuster and normally requires very little tightening. The belt adjuster offers the
possibility of readjustment.
Attention: Dangerous gap/capture area at the tail shaft at the back of the device (belt re-entry
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zone). Take care that long hair and loose clothing are not caught in the gap of the tail shaft.
For safety reasons, the adjustment procedure must be attended by a second person who can
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immediately press the emergency stop button in an emergency.
Switch off the running machine and pull the mains plug before intervening.
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In case of any maintenance work on the treadmill, ties have to be removed. The tie might be
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pulled in and the person wearing will be strangled.
8.7.1

Checking the tension of the driving belt with the "slipping-test"

The "slipping-test" can detect if the drive belt has too low tension. The "frequency-test" must be used (see next point) to
exclude too high tension. The driving belt tension is checked as the running belt tension:
Block the running belt at a speed of 1 - 1.5 km/h.
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Ensure that there is no backlash between the motor shaft and the driving belt.
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Ensure that the tension at the bottom run (see picture) is between 98 Hz and 103 Hz (frequency at
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oscillation).
The noise at higher speeds and the correct course on the pinion should be considered.
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© 2013 h/p/cosmos sports & medical gmbh
file: n:\article\cos14310m5-v1_07hpc-en\20130207_cos14310m5-v1.07hpc-en_h-p-cosmos_treadmill_manual.doc
author: fh email@h-p-cosmos.com
maintenance and safety inspections
created 07.02.2013 printed 04.03.2013 page: 120 of 197