Disassembly, Inspection & Reassembly
TT Twin-Screw Pump -
Installation, Operation, and Maintenance Manual
61
23. Dispose all single use items like Gasket, o- ring, grease and lipseal with new parts as per
safety policy.
24. 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), Seal Chamber (419) & Bearing Housings (401) (407) 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
0.125” (3.2mm) deep
•
Pitting that is greater than
0.125” (3.2mm) deep
•
Irregularities such as heavy scratches, corrosion, denting etc. in the casing-gasket
sealing surface. If the irregularity spans the sealing surface and is deeper than 15% of
the gasket thickness, sealing integrity is likely to be impaired.
•
Screw shaft to body clearances that exceed the values in the Minimum running
clearances table by more than 50%.
NOTICE:
When clearances between the screw shaft and body become excessive (increase by 50%),
hydraulic performance decreases substantially. High rated pressure differentials will tend to
magnify any loss of hydraulic performance.
Body and seal housings areas to inspect
The arrows point to the areas to inspect for wear on the body (350), Seal Chamber (419) &
Bearing housing (401) (407):
