Dixon RZL-400, Operating And Maintenance Manual, Page: 51 / 78

51 Rotary Lobe Pumps - RZL-400 Series 800.789.1718
Maintenance
Rotor Clearance (continued)
Rotor width and body depth are fixed at manufacturer. Therefore, with the correct rotor size selected, the only maintenance
adjustment that can be made is the proportion of front and rear clearance. Measure the front clearance as follows:
1. The rotor to rotor housing back face clearance is maintained by the shim (45).
2. Check that the rotor housing (31) is tight to gearbox (1A). And check the rotor bolts (35) are tight.
3. Measure the clearance between the back face of the pump housing and the back of the rotor with a feeler gauge. Check the
reading with the recommended back face clearance.