Disassembly, Inspection & Reassembly
68
236 Series
Twin-Screw Pump -
Installation, Operation, and Maintenance Manual
Reassembly of the pump (standard component method)
WARNING:
Lifting and handling heavy equipment poses a crush hazard. Use caution during lifting and
handling and wear appropriate Personal Protective Equipment (PPE, such as steel-toed
shoes, gloves, etc.) at all times. Seek assistance if necessary.
NOTICE:
Make sure that all parts and threads are clean and that you have followed all directions under
the inspections section. Deburr parts if necessary. Apply a Molybdenum based anti-seize
compound with a 0.15 friction coefficient to all the threads.
WARNING:
Check for magnetism on the screw shafts (100) and demagnetize the shaft if there
is Magnetism detected. Magnetism attracts ferritic objects to the mechanical seal, gears
and bearings which can result in excessive heat generation, sparks, and premature failure.
1. Insert liner (352) into the pump casing (350). Check that the liner (352) is axially
centered in the pump casing (350).
2. Pair both screw shafts (100) on a flat surface and center them axial to each other (align
the rotors axial so that the shoulders of the thrust-bearings are axially aligned to each
other)
3. Install the dowel pins (376) if they were removed.
4. If bushings (725) were removed, install new bushings onto screw shafts (100) using
Loctite® 638 or equivalent.
5. If the pump is fitted with component mechanical seals, install the rotating portion of the
mechanical component seal on screw shafts (100) both sides and lock using set screws
with specified length from screw profile as per sectional drawing.
6. Insert shims (130), (131) into cover DF.
7. Working with cover DF (401) press in bearings (105) and oil seals (721). Install covers
KK (404) and screws (433).
8. If the pump is fitted with component mechanical seals, install seal cover (470) and O-ring
(703) onto cover DF (401) and secure with screws (471). Install the stationary portion of
the mechanical seal (702) and anti-rotation pin (480) into the seal cover (470).
If a cartridge seal is fitted the cartridge seal, install the cartridge seal into cover DF (401)
and secure with screws (471). Secure screws (471) with Loctite® 243 or equivalent.
9. Clamp or otherwise brace the screw shafts (100). Assemble cover DF (401) onto the
screw shafts until no gap remains between bearings (105) and bushings (725).
10. Verify that the correct flank to flank clearance between the screw shafts (100) exists. If
necessary, adjust the shim stack thickness for shims (130), (131) and repeat steps 6. to
9. until acceptable flank to flank clearance is achieved.
