Mody Pumps MS 482 - Manual (Page 8)

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 AS PER TOOL KIT LIST. (LIST IS AVAILABLE
AT THE END OF THE MANUAL). IT IS NOT POSSIBLE TO CONDUCT THE
OVERHAUL WITHOUT THE REQUISITE TOOLS.
DIS-ASSEMBLY (REFER DRG.NO.MS/801/803 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 DIS – ASSEMBLY. 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
(36) 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 (33) AND REMOVE PUMP VOLUTE (19) FROM SEAL HOUSING (17). REMOVE
CAP SCREW (25) AND SPRING WASHER (24). REMOVE LOCK WASHER (23) 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 (28) AND KEEP ASIDE
CAREFULLY.
• THE LOWER MECHANICAL SEAL IS LOCKED ON THE SHAFT BY MEANS OF A LOCKING RING
(30). THIS RING CAN ONLY BE REMOVED/INSTALLED BY MEANS OF A SPECIAL TOOL
SUPPLIED ON REQUEST. (A PICTORIAL REPRESENTATION OF THE INSTALLATION /
REMOVAL METHOD IS APPENDED AT THE END OF THE MANUAL.SEE FIG. 1.) READ THE
INSTRUCTIONS SUPPLIED WITH THE TOOL CAREFULLY AND REMOVE THE LOCKING RING
FROM THE SHAFT. 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 (4) 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 (38) HOLDING THE LOWER BEARING BRACKET AGAINST THE
STATOR CASING. 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.