Mody Pumps G 706 TM - Manual (Page 8)

6. THE SEAL CHAMBER CONTAINS APPROX. 5 LITERS OF OIL. THE LEVEL AND CONDITION
OF THE OIL SHOULD BE CHECKED EVERY SIX MONTHS. UNSCREW THE OIL PLUGS AND POUR
OUT SOME OIL. NOTE THAT THE OIL GETS A SLIGHTLY DARKER SHADE, BUT THIS IS
NORMAL AND IS NO CAUSE FOR WORRY. IF THE OIL IS EMULSIFIED BY WATER, THE SEALS
HAVE WORN OUT AND MUST BE REMOVED FROM THE ROTOR FOR FURTHER ACTION.
7. LAY DOWN THE PUMP AND REMOVE THE REMAINING PARTS. UNSCREW NUT AND REMOVE
LOCK WASHER. USE A PRY BAR TO HOLD IMPELLER WHILE UNSCREWING IMPELLER LOCKNUT
AND SLIDE OFF IMPELLER FROM SHAFT. THEN REMOVE TRIMMING SPACERS AND SAND GUARD
FROM THE SEAL HOUSING.
8. UNSCREW NUTS AND FOUR STUDS AND REMOVE WEAR PLATE. THIS CAN BE EASILY DONE
BY INSERTING TWO SCREWDRIVERS BETWEEN WEAR PLATE AND LOWER BEARING BRACKET AND
PRYING THE WEAR PLATE LOOSE. ALL THE PUMP PARTS HAVE BEEN DISMANTLED. REPLACE
WORN PARTS.
9. THE OIL DIAPHRAGM IS NOW IN VIEW. UNSCREW BOTH THE OIL PLUGS AND DRAIN OUT
THE OIL FROM THE OIL CHAMBER. UNSCREW SOCKET HEAD SCREW AND REMOVE OIL BAG
RING. TURN OIL DIAPHRAGM INSIDE OUT AND REMOVE SMALL OIL CLAMP BY UNSCREWING
SCREW. REMOVE OIL DIAPHRAGM. SLIDE OFF CAP FOR CIRCLIP, OUTER CIRCLIP FROM
ROTOR SHAFT AND REMOVE LOWER MECHANICAL SEAL. BE VERY CAREFUL IN HANDLING THE
TUNGSTEN CARBIDE SEAL FACE. LEAVE STATIONARY TUNGSTEN CARBIDE SEAT IN THE SEAL
HOUSING. UNSCREW FOUR NUTS AND PULL OUT SEAL HOUSING. THE STATIONARY TUNGTEN
CARBIDE SEAL FACE WILL COME OUT WITH THE SEAL HOUSING. HANDLE THE FACE
CAREFULLY. THE UPPER MECHANICAL SEAL IS NOW IN VIEW. REMOVE THE UPPER SEAL IN
THE SAME WAY AS THE LOWER SEAL.
10. REMOVE THE FOUR NOS. DEEP SEATED CAP SCREWS THAT HOLD THE LOWER BEARING
BRACKET AGAINST THE INNER CASING. THERE ARE FOUR NOS. TAPPED THROUGH HOLES IN
THE LOWER BEARING BRACKET. THE LOWER BRACKET COMPLETE WITH THE ROTOR, BEARING,
BEARING COVER AND TUNGSTEN CARBIDE SEAT WILL COME OUT WITH THE LOWER BEARING
BRACKET. REMOVE BOLTS AND REMOVE BEARING COVER. PULL OUT ROTOR WITH BEARING
FROM LOWER BEARING BRACKET. (IF THIS IS DIFFICULT USE A HAND PRESS TO REMOVE
ROTOR FROM BEARING BRACKET. ENSURE NO DAMAGE TO THE TUNGSTEN CARBIDE SEAT IN
BEARING BRACKET). THE TC SEAT WITH CUP SEAL HOLDER CAN NOW BE PUSHED OUT FROM
THE BEARING SIDE BY GENTLY TAPPING THE SAME. (USE FINGERS OR A NYLON TIPPED
LIGHT HAMMER ONLY).
11. CHECK BOTH UPPER AND LOWER BEARINGS FOR ANY RADIAL OR AXIAL PLAY OR ANY
ABNORMAL NOISE WHILE SPINNING THE SAME. CHECK FOR ANY LEAKAGE OF GREASE THROUGH
THE SHIELD OF THE UPPER BEARING. IF BEARING SEEMS WORN OUT OR ANY GREASE
LEAKAGE IS OBSERVED, REPLACE BEARING. (DO NOT USE ANY STANDARD BEARING PROCURED
FROM THE MARKET. THE PUMPS USE BEARINGS WHICH ARE PRE-FILLED WITH A SPECIAL
HIGH TEMPERATURE GREASE AVAILABLE FROM US READILY).
12. THE TOP BRACKET IS HELD IN POSITION BY FOUR STUD BOLTS ON THE INNER CASING.
UNSCREW THE NUTS AND REMOVE THE INNER CASING. ALTERNATIVELY TWO SCREWDRIVERS
MAY BE USED TO PRY THE TOP BRACKET FROM THE STATOR.
13. THE STATOR IS SHRINK-FITTED IN THE INNER CASING. THE STATOR CAN NOW BE
CHECKED FOR ANY ELECTRICAL FAULTS.