Importance of maintaining the correct v-belt tensioning:
Too high a v-belt tension will overload the generator bearings and cause a major generator failure which will be costly to repair.
Too low a v-belt tension can allow v-belt slippage which will damage the v-belt as well as the pulleys resulting in avoidable downtime.
How to correctly test belt tension?
Figure 1 above shows the compartment that needs to be opened
2. Isolate the machine (isolator key removed and battery disconnected)
3. Remove generator V-belt cover
Figure 2 shows the generator v-belt guard that must be removed
4. Set the tension meter to 1500 N.m
5. Slide the tension meter onto finger then place it on the centre span of the V-belt between the two pulleys
Figure 3 shows the tension meter set to 1500N.m on the v-belt
6. Press your finger down until the tension meter ‘clicks'
7. Remove the tension meter carefully and read the value on the meter
Figure 4 shows the tension meter at the 'click point'
8. The tension required on the generator V-belts is as follows:
The image above displays the proper alignment which is essential to maintain long belt and pulley life
Figure 5 taken from Fenner Drive Design & Maintenance Manual
The image above displays poor alignment
Figure 6 taken from Fenner Drive Design & Maintenance Manual
9. Replace the V-belt guard
10.Insert isolator key and re-connect batteries
11.V-belt tension must be checked every 250 hours under normal conditions. In conditions of severe dust, it needs to be checked every 100 hours