Mody Pumps MS 6202 - Manual (Page 7)

GENERAL OVERHAUL AND OIL CHECK. (THIS APPLIES TO BOTH
MODELS
)
TO CARRY OUT A GENERAL OVERHAUL, IT IS ESSENTIAL THAT A COMPLETE
SET OF TOOLS BE AVAILABLE.
DIS-ASSEMBLY (REFER DRG.NO.MS/827 SHEET 1 & 2) AT END OF MANUAL
)
• IT IS MANDATORY THAT ALL "O" RINGS BE REPLACED WHENEVER A PUMP IS OVERHAULED
OR DISMANTLED. UNDER NO CIRCUMSTANCES SHOULD OLD "O" RINGS BE USED, EVEN IF
THEY SEEM O.K. BE CAREFUL NOT TO SCRATCH SEALING SURFACES. ALWAYS GREASE NEW
“O” RINGS BEFORE INSTALLATION.
• ALWAYS ISOLATE THE UNIT FROM ELECTRICAL POWER BEFORE ATTEMPTING ANY
OVERHAUL.
• THE TRANSPORTABLE VERSION IS SUPPLIED WITH A PUMP BASE. REMOVE BASE BEFORE
ANY FURTHER DISASSEMBLY. THE PERMANENT INSTALLATION VERSION IS SUPPLIED WITH
A SLIDING BRACKET FIXED ON THE VOLUTE OF THE PUMP.
• LAY THE PUMP ON ITS SIDE ON A BENCH OR OVER TWO SUPPORTS. TURN THE PUMP SO
THAT THE OIL ORIFICE FACES DOWNWARDS. USING AN ALLEN KEY UNSCREW OIL PLUG
(34) TO DRAIN OIL FROM THE SEAL CHAMBER. IT IS EASIER TO DRAIN THE OIL IF
THE OTHER OIL HOLE CAP SCREW IS ALSO REMOVED. BE CAREFUL. IF THE SEAL HAS
LEAKED, THE OIL CASING MAY BE UNDER PRESSURE. HOLD A RAG OVER THE OIL PLUG
TO PREVENT SPLATTER.
• UNSCREW NUTS (14) AND REMOVE PUMP VOLUTE (21) FROM SEAL HOUSING (19). REMOVE
CAP SCREW (27) AND SPRING WASHER (26). REMOVE LOCK WASHER (25) AND SLIDE
IMPELLER OF THE MOTOR SHAFT. IF THE IMPELLER IS SLIGHTLY TIGHT USE A WOODEN
MALLET TO TAP THE SAME OFF THE SHAFT. REMOVE KEY (30) AND KEEP ASIDE
CAREFULLY.
• THE LOWER MECHANICAL SEAL IS LOCKED ON THE SHAFT BY MEANS OF A CIRCLIP (32).
THE MECH. SEAL ASSEMBLY CAN NOW BE REMOVED FROM THE SHAFT BY HAND. BE VERY
CAREFUL WITH THE SEALING SURFACES SO THAT THEY DO NOT SUFFER DAMAGE OR GET
SCRATCHED IN ANY WAY. LEAVE THE SEAL SEAT IN THE SEAL HOUSING.
• UNSCREW NUTS (14) HOLDING THE SEAL HOUSING AGAINST THE STATOR CASING AND
REMOVE SEAL HOUSING. USE A WOODEN MALLET TO TAP OFF THE SAME. THE UPPER
MECH. SEAL IS NOW IN VIEW. REMOVE THE SEAL IN EXACTLY THE SAME MANNER AS THE
LOWER MECH. SEAL.
• UNSCREW HEX HD BOLTS (36) HOLDING THE LOWER BEARING BRACKET AGAINST THE
STATOR CASING. USE JACKOUT BOLTS IF NECESSARY. THE COMPLETE ROTOR ASSEMBLY
WITH LOWER BEARING BRACKET AND LOWER BEARINGS CAN BE PULLED OUT FROM THE
STATOR ASSEMBLY. THE LOWER BEARING BRACKET CAN BE REMOVED FROM THE ROTOR BY
REMOVING THE BEARING COVER. THE BEARING CAN NOW BE EXAMINED.
• UNSCREW NUTS (4) HOLDING THE PUMP COVER AND PRY OUT THE SAME. REMOVE THE
WIRE CONNECTORS (43) TO SEPARATE THE POWER CABLE FROM THE MOTOR LEADS. THE
WIRE CONNECTORS CAN BE UNSCREWED COUNTER CLOCKWISE TO RELEASE THE SAME.
UNSCREW NUT FOR GROMMET (45) AND REMOVE RUBBER GROMMET (44). REMOVE BOLT
(42) AND PRY OUT UPPER BEARING BRACKET (7).
• THE STATOR IS NOW AVAILABLE FOR ELECTRICAL CHECKS, IF ANY ARE REQUIRED. WE
RECOMMEND MEASURING LINE TO LINE RESISTANCE BETWEEN THE THREE POWER LEGS, A
MEGGING TEST AND IF AVAILABLE A HIGH POT.