CYLINDER & LINES GP-THUMB 5046176 - Caterpillar

Belt Tension Frequency
The belt for the air pump must be checked with a suitable belt tensioner meter. The meter checks the vibration frequency of the belt in order to determine the belt tension.Refer to table 1 for three cylinder engines. Refer to table 2 for four cylinder engines.
Table 1
3 Cylinder Engines    
High Mounted Air Pump     Low Mounted Air Pump     Frequency Range for a New Belt     Frequency Range for a Used Belt    
X     -     85-90 Hz     70-75 Hz    
-     X     175-180 Hz     147-152 Hz    
Table 2
4 Cylinder Engines    
High Mounted Air Pump     Low Mounted Air Pump     Frequency Range for a New Belt     Frequency Range for a Used Belt    
X     -     77-82 Hz     65-70 Hz    
-     X     175-180 Hz     147-152 Hz