Mody Pumps MHMXP 6 X 12 - Manual (Page 8)

GENERAL OVERHAUL AND OIL CHECK. (THIS APPLIES TO ALL
MODELS
)
MOTORS ARE FM LISTED FOR APPLICATIONS IN CLASS 1, DIV 1, GROUPS C
& D EXPLOSION PROOF ENVIRONMENTS. ALL REPAIRS OTHER THAN LEAD
RECONNECTS AND SEAL REPLACEMENT SHALL BE PERFORMED BY AN
AUTHORIZED FM APPROVED SERVICE FACILITY. ANY OTHER REPAIRS
PERFORMED BY THE END USER OR CUSTOMER NEGATES THE FM 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 NUTS AND REMOVE PUMP VOLUTE FROM SEAL ADAPTER PLATE. REMOVE CAP
SCREW AND LOCK WASHER. 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
AND TRIMMING SPACERS. KEEP ASIDE CAREFULLY.
• THE LIP SEAL IS NOW IN VIEW. REMOVE IT GENTLY USING A PAIR OF SCREWDRIVERS.
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 HOLDING THE ADAPTER AGAINST THE STATOR CASING AND REMOVE
HOUSING. 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.