Gardner Denver RBS 15, Service Manual And Parts List

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4 REPAIR OF THE PARTS
4.1 Rotors
Clean the external surface of the rotors, remove the incrustations and rust using solvents and scraper.
WARNING: Keep to the prescribed safety rules when using solvents and wear protection
glasses and safety gloves
NOTE: Do not damage the external surface of the rotors when using the scraper
Check the external surface of the rotors, if there are any signs of seizure, cracks or grooves replace the
rotors. Measure the external diameter DR of the rotors, the maximum thickness SL of the lobes in various
points along their length and the maximum length LR of the rotors
Fig. 15
Place the rotors between the centers of a lathe as indicated in figure
Check the surface of the bearing seats on the shaft and the surface of the tapered seats of the gear wheels,
if there are any signs of seizure, cracks or grooves also of small dimensions replace the rotors.
WARNING: Any discontinuity also of small dimensions on the external surface of the shaft
compromise the blower safety
Measure with a comparator the concentricity of the external diameter of the rotors with the seats of the
bearings as indicated in figure
Fig. 16
Communicate the values of the recorded data to ROBUSCHI to check the possibility of using the rotors again.
NOTE: In case of replacement of a rotor it is necessary always to replace both rotors