Belt Tension Gauge - Use and Calibration

Belt tension gauge - use and calibration

It is essential that the belts be correctly tensioned to ensure maximum reliability and long life. Gauge 998 8500 must be used to adjust the tension to the correct value.

Components of gauge




1. Indicator
2. Indication marker
3. Marker adjuster
4. Movable guide latch





5. Movable guide
6. Sensing roller
7. Fixed guide


Measurement




Check that gauge is zeroed
Turn dial to zero indicator.
Release movable guide.





Place gauge on belt
Position sensing roller between two teeth.





Raise movable guide
Raise guide until it locks in upper position.





Hold gauge in neutral position against belt
Hold gauge without pressing upwards or downwards.
Set indication marker to coincide with indicator.





Release movable guide
Pull out movable guide latch.


















Remove gauge from belt and read indicated value


Calibration

Gauge must be calibrated
- after prolonged use (approx. 100 measurements),
- following exposure to minor shocks.





Check that gauge is zeroed
Turn dial until indicator reads zero.





Place calibration plate in position
Position plate with projections in contact with guides. Press movable guide upwards until locked in upper p0sition.





Calibration value
Gauge should now read 4.0 units.

If value is incorrect: Adjust using 1.5 mm Allen key inserted in hole 1 in bottom of gauge.

CAUTION: Adjustment must be limited to within ± 1 unit of the calibration value. If error is greater, return instrument to Volvo Parts for repair.