ELECTRICAL INFORMATION.
MOTORS ARE DESIGNED TO OPERATE ON SINGLE VOLTAGE AND FREQUENCY. MAX. DEVIATION
IN VOLTAGE ALLOWED IS + - 6 % AND FREQUENCY +- 3% .CHECK NAME PLATE FOR
OPERATING VOLTAGE AND FREQUENCY.
DISMANTLING AND OVERHAULING.
GENERAL OVERHAUL AND OIL CHECK.(REF. DRGS. # DW/130/00 SHEETS 1 & 2)
1. ALWAYS REPLACE O-RINGS WITH NEW ONES WHENEVER DISMANTLING AND RE-ASSEMBLING
A PUMP. NEVER RE-USE OLD O-RINGS.
2. REMOVE BASE PLATE(21),STRAINER(20),NUT(18),AND DIFFUSER(19/40).THE DRAWING
SHOWS THESE DETAILS. CHECK BY HAND THAT THE ROTOR SHAFT IS NOT BLOCKED.
3. PLACE THE PUMP ON THE BOTTOM STUDS(17).TAP THE OUTER CASING(10) WITH NYLON
TIPPED HAMMERS TILL IT LOOSENS FROM THE TOP BRACKET(6).SEPARATE THE OUTER
CASING FROM THE TOP BRACKET BY EMPLOYING TWO SCREW DRIVERS AS LEVERS AND PUSH
THE OUTER CASING DOWNWARDS TILL IT STANDS ON THE FLOOR. LIFT THE UNIT BY THE
TIE BOLTS(3) CLEAR OFF THE OUTER CASING.
4. THE SEAL CHAMBER CONTAINS APPROX. 1.5 LITTERS OF OIL. THE LEVEL AND
CONDITION OF THE OIL SHOULD BE CHECKED EVERY SIX MONTHS. UNSCREW THE OIL
PLUGS(66) 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.
5. LAY DOWN THE PUMP AND REMOVE THE REMAINING PARTS. UNSCREW NUTS(23) AND
REMOVE LOCK WASHER(24)(USE IMPELLER SPANNER(T7004)TO HOLD IMPELLER WHILE
UNSCREWING NUTS) AND SLIDE OFF IMPELLER(26) FROM SHAFT. THEN REMOVE TRIMMING
SPACERS(27) AND SAND GUARD(59). UNSCREW THE FOUR CHEESE HEAD SCREWS (72) AND
REMOVE THE SAND GUARD (69) FROM THE SEAL HOUSING (28).
6. UNSCREW NUTS(18) AND FOUR STUDS(17)AND REMOVE WEAR PLATE(29).THIS CAN BE
EASILY DONE BY INSERTING TWO SCREWDRIVERS BETWEEN WEAR PLATE AND LOWER
BRACKET(15) AND PRYING THE WEAR PLATE LOOSE. ALL THE PUMP PARTS HAVE BEEN
DISMANTLED. REPLACE WORN PARTS.
7. THE OIL DIAPHRAGM(56) IS NOW IN VIEW. UNSCREW BOTH THE OIL PLUGS(66) AND
DRAIN OUT THE OIL FROM THE OIL CHAMBER. LOOSEN SCREWS AND NUTS(33/54) FROM THE
BIG OIL CLAMP(55) AND REMOVE CLAMP. TURN OIL DIAPHRAGM INSIDE OUT AND REMOVE
SMALL OIL CLAMP IN THE SAME FASHION. REMOVE OIL DIAPHRAGM. SLIDE OFF OUTER
RETAINING SPRING(61) FROM ROTOR SHAFT AND REMOVE LOWER MECHANICAL SEAL FROM
ROTOR SHAFT. BE VERY CAREFUL IN HANDLING THE TUNGSTEN CARBIDE SEAL FACE. LEAVE
STATIONARY TUNGSTEN CARBIDE SEAT IN THE SEAL HOUSING(28).UNSCREW FOUR NUTS(65)
AND PULL OUT SEAL HOUSING(28).THE STATIONARY TUNGSTEN 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.
8. REMOVE THE FOUR NOS. DEEP SEATED CAP SCREWS(16) THAT HOLD THE LOWER BEARING
BRACKET AGAINST THE INNER CASING. BY MEANS OF TWO NOS. SCREW DRIVERS REMOVE THE
LOWER BEARING BRACKET FROM THE INNER CASING(12). THE COMPLETE ROTOR(11) WITH
BEARING(68), BEARING COVER AND TUNGSTEN CARBIDE SEAT WILL COME OUT WITH THE
LOWER BEARING BRACKET. REMOVE BOLTS(70) 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 STATIONARY
TC 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).
(18 pages)
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