Flowserve MSX Series - Pump Assembly; Maintenance of Casing; Maintenance of Wearing Rings; Removal of Wearing Rings

Flowserve Pump Division - 23
7. Remove primary ring of the upper mechanical seal by removing the snap ring on the
shaft. The mating ring (stationary face) of the mechanical seal should not be removed
unless it is being replaced.
CAUTION: BEARING REMOVAL OR INSTALLATION MUST ONLY BE DONE BY PERSONS
QUALIFIED AND AUTHORIZED BY FLOWSERVE PUMP DIVISION.
AUTHORIZATION CAN BE OBTAINED BY ATTENDING A FLOWSERVE PUMP
DIVISION SERVICE SCHOOL FOR MSX SERIES 2 PUMPS.
Carefully examine all individual parts, important joints and all wearing surfaces as the pump and rotor are
dismantled. As a general rule, regardless of the performance of the unit, parts appreciably worn should
be replaced if it is not intended to examine the pump until the next overhaul period. It is recommended
that the mechanical seals and O-rings be replaced whenever the bearing house is disassembled.
PUMP ASSEMBLY
To assemble the pump, reverse the dismantling instructions previously described. Follow the mechanical
seal and wearing ring instructions. Torque all assembly bolts and screws to the torque values listed at
the end of this section. Assemble in the following order:
1. Replace upper mechanical seal.
2. Replace the adapter cooling fluid impeller cover plate by placing the alignment pin in the
bearing housing. Be sure to install the O-ring at the oil supply table.
3. Install the oil impeller on the shaft. The set screw which secures this impeller has a nylon
insert which prevents in from backing out. This set screw must be replaced.
4. Replace the adapter plate using the alignment pins to assure to proper orientation. Be
sure to replace the two O-rings between the adapter plate and the cover plate.
CAUTION: RE-ASSEMBLY OF THE COVER PLATE AND ADAPTER PLATE TO THE BEARING
HOUSING REQUIRES ALIGNMENT OF THE PARTS BY A PIN. ALIGNMENT OF
THESE PARTS IS CRITICAL TO THE FUNCTION OF THE COOLING SYSTEM.
5. If the heat exchanger plate was removed, replace it with new O-rings and install the snap
ring.
6. Replace the lower mechanical seal.
7. Assemble the components of the rotating element. The impeller screw is locked in place
using Loctite 2760. Mating surfaces must be thoroughly cleaned and dry prior to
application of the Loctite compound. Apply Loctite to the threads and shoulder face (for
lubrication). This screw must be replaced.
8. Install the casing wearing rings.
9. Install the rotating assembly in the casing.
MAINTENANCE OF CASINGS
The casing waterways should be kept clean and clear of rust. Whenever a unit is dismantled, clean the
waterways of the casing.
MAINTENANCE OF WEARING RINGS
Generally, it is recommended that the wear rings be replaced or overhauled when pump performance has
decreased appreciably due to excessive wearing ring clearance or when the diametrical clearance
exceeds 0.010" (0.25 mm) per inch of ring diameter.
Removal of Wearing Rings
The casing wearing ring and impeller wearing ring (optional) are mounted using an interference fit.
Removing these rings may require cutting or machining.