Disassembly, Inspection & Reassembly
236 Series Twin-Screw Pump -
Installation, Operation, and Maintenance Manual
61
22. It is not recommended to remove bushings (725) from screw shafts (100) unless these
exhibit wear and need to be replaced.
23. Remove the pump liner (352) from the pump casing (350).
24. If the pump is fitted with component mechanical seals, remove screws (471) then remove
seal cover (470) and O-ring (703) from cover D (407). Remove the stationary portion of
the seal (702) and anti-rotation pin (480) from the seal cover (470).
If a cartridge seal is fitted the cartridge seal, remove screws (471) then remove the
cartridge seal from cover D (407).
25. Press out bearings (103) and oil seals (721) from cover D (407).
26. If the pump is fitted with component mechanical seals, remove screws (471) then remove
seal cover (470) and O-ring (703) from cover DF (401). Remove the stationary portion of
the seal (702) and anti-rotation pin (480) from the seal cover (470).
If a cartridge seal is fitted the cartridge seal, remove screws (471) then remove the
cartridge seal from cover DF (401).
27. Remove screws (433) then remove covers KK (404) from cover DF (401).
28. Press out bearings (105) and oil seals (721) from cover DF (401).
29. Remove and retain shims (130), (131) from cover DF. It is recommended that the shims
are match marked to assure current placement on reassembly.
30. Press out oil seal (704) from gearbox housing (406).
31. Dispose all single use items like gaskets, O-rings and lip seals with new parts as per
safety policy.
32. Dispose the gearbox oil if the service time is completed as per safety policy.
Preassembly inspections
Replacement guidelines
Casing check and replacement
WARNING:
Risk of death or serious injury. Leaking fluid can cause fire and/or burns. Replace all gaskets
and O-rings at each overhaul or disassembly. Inspect all gasket and O-ring sealing surfaces
for damage and repair or replace as necessary.
Inspect the body (350), liner (352), seal cover (470), cover D (407) and cover DF (401) for
cracks and excessive wear or pitting. Thoroughly clean gasket surfaces and alignment fits to
remove rust and debris.
Repair or replace these parts if you notice any of these conditions:
•
Localized wear or grooving that is greater than 3.2mm (0.125in) deep
•
Pitting that is greater than 3.2mm (0.125in) deep
