- 10 -
MAINTENANCE
WARNING
Before servicing the pump, disconnect the electrical
power source, carefully relieve all pressure, and drain all
fluids from the pump and connected piping.
CLEANING
DISASSEMBLY OF PUMP FLUID HEAD
It is necessary to disassemble parts of your pump for cleaning and sanitizing. Disassemble as
described below after disconnecting the suction and discharge piping. If so equipped, also
disconnect the relief cover air line.
Note:
For added protection when disassembling pump fluid head, place all parts on rubber mat
or wooden platform. Extreme care must be exercised during assembly and disassembly
of the fluid head - especially in handling of the rotary seal parts and rotors.
1.
Remove casing nuts and slide the casing cover off the casing studs. Carefully remove the o-
ring from the inside of the cover.
2.
Remove the rotors from the drive and pump shafts.
3.
Slide the casing off the studs.
4.
Carefully remove the casing o-rings from the rear of the casing.
5.
Slide the seal rings off the shaft.
6.
Remove the wear rings. If necessary use Puller No. R80-200 supplied with your pump. Do
not pry wear rings off with a screwdriver or similar tool as the flanges may be damaged.
Carefully remove shaft o-rings. On PRED models, with double seal assemblies, remove rear
seal rings and o-rings.
Seals: Inspect the carbon face of the seal ring and the wear ring seal surface for nicks, scratches
or excessive wear. Inspect all o-rings for cuts, abrasions or wear. Replace any damaged or worn
parts.
Rotors: Inspect rubber rotor for cuts, cracks or other damage to the rubber composition. Inspect
metal rotor carbons for cracks or wear and replace if damaged. Check fit of metal or rubber rotors
on shafts and replace if excessively loose.
