Dixon RZL-400, Operating And Maintenance Manual, Page: 49 / 78

49 Rotary Lobe Pumps - RZL-400 Series 800.789.1718
Maintenance
Inspection
1. Inspect O-rings and seals for reuse. Worn O-rings and seals should be replaced.
2. Inspect seal faces for scoring or cracks. Replace any seal faces that are damaged.
3.
Inspect rotors for any damage or abnormal wear.
4. Inspect rotors for wear on splines and that they fit snuggly on the shafts.
5. Inspect shafts for wear on splines and make sure they are not loose in the gear case.
6. Inspect rotor galling sign among the rotor housing, front cover and rotors. Must be removed or replaced.
7. Inspect burr of the rotor bolt groove. Must be removed or replaced.
Pump Housing Assembly
Before installing the pump housing (31) to the gearbox make sure that the surface of the pump hosing and gear box are clean and
check the shim plate between pump housing and gear box. Install the pump housing (31) onto the gear box (1A) and secure the four
housing set nuts (46).
When installing the ceramic shaft sleeve onto the pump shaft, align sleeve with fit pin.
Follow the disassembly instructions in reverse for all types of seals and rotor assembly.
Assemble a rotor onto shaft engaging the shallow groove with small spline in rotor and seal side
first in to the shaft.
Place the plastic dowel between the rotors. Tighten the first rotor bolt with a special tool to the recommended torque.
Model Rotor Nut Torque Specification
RZL 105 116.3 in. lbs.
RZL 110
116.3 in. lbs.
RZL 115 116.3 in. lbs.
RZL 120 116.3 in. lbs.
RZL 220 277.8 in. lbs.
RZL 225 277.8 in. lbs.
RZL 330 434.0 in. lbs.
RZL 340
434.0 in. lbs.
RZL 440 651.0 in. lbs.
RZL 450 651.0 in. lbs.
To tighten the second rotor place the plastic dowel on the opposite side of the rotor and tighten the second rotor bolt to the proper
torque.
Install the cover (32) and tighten the cap nuts (33).