Mody Pumps MHMXP - Manual (Page 9)

GENERAL OVERHAUL AND OIL CHECK. (THIS APPLIES TO BOTH
MODELS
)
MOTORS ARE UL LISTED FOR APPLICATIONS IN CLASS 1, DIV 1, GROUPS C
& D EXPLOSION PROOF ENVIRONMENTS. ALL REPAIRS OTHER THAN LEAD
RECONNECTS AND OUTER SEAL REPLACEMENT SHALL BE PERFORMED BY AN
AUTHORIZED RELIANCE SERVICE FACILITY. ANY OTHER REPAIRS PERFORMED
BY THE END USER OR CUSTOMER NEGATES THE UL LISTING AND MOTOR
WARRANTY.
DIS-ASSEMBLY
• 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 PERMANENT INSTALLATION VERSION IS SUPPLIED WITH A SLIDING BRACKET FIXED
ON THE VOLUTE OF THE PUMP. LAY THE PUMP ON IT’S SIDE ON A BENCH OR OVER TWO
SUPPORTS.
• UNSCREW BOLTS (9) AND REMOVE PUMP VOLUTE (1) FROM PUMP BASE (8) IF PRESENT
AND THEN UNSCRES VOLUTE BOLTS AND REMOVE ADAPTER PLATE. REMOVE CAP SCREW AND
LOCK WASHER (4 & 5). 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
(6) AND TRIMMING SPACERS (10). KEEP ASIDE CAREFULLY.
• THE LOWER MECHANICAL SEAL IS NOW IN VIEW. BE CAREFUL. IF THE SEAL HAS
LEAKED, THE OIL CASING MAY BE UNDER PRESSURE. USING A NOSE/CIRCLIP PLIER
REMOVE SNAP RING. 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 (12) HOLDING THE ADAPTER PLATE AGAINST THE STATOR CASING AND
REMOVE HOUSING ONLY IN HARD METAL PUMPS. CAST IRON PUMPS DO NOT HAVE A
WEAR/ADAPTER PLATE. EXAMINE IMPELLER, WEAR RING FOR WEAR. CHECK CONDITION OF
OIL. IF EMULSIFIED AND CONTAMINATED REPLACE OUTER MECHANICAL SEAL. IF OIL
CHAMBER IS FULL OF PUMPED FLUID WE RECOMMEND CHANGING BOTH MECHANICAL SEALS
INNER AND OUTER.