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. NO. DW/136/00 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 (75),STRAINER (74),NUT (18), HEX HD. BOLTS (76), DIFFUSER
HOLDER (71),AND DIFFUSER (70).THE DRAWING SHOWS THESE DETAILS. CHECK BY HAND
THAT THE ROTOR SHAFT IS NOT BLOCKED.
3. PLACE THE PUMP ON THE BOTTOM STUDS (62). TAP THE OUTER CASING (69) WITH
NYLON TIPPED HAMMERS TILL IT LOOSENS FROM THE TOP BRACKET (22). 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 EYE BOLTS (31) 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
(45) 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 NUT (67) AND
REMOVE LOCK WASHER (66)(USE IMPELLER SPANNER (T7005)TO HOLD IMPELLER WHILE
UNSCREWING NUTS) AND SLIDE OFF IMPELLER(65) FROM SHAFT. THEN REMOVE TRIMMING
SPACERS (63). UNSCREW THE FOUR PHILLIPS HEAD SCREWS (60) AND REMOVE THE SAND
GUARD (59) FROM THE SEAL HOUSING (49).
6. UNSCREW NUTS (72) AND FOUR STUDS (62) AND REMOVE WEAR PLATE (61). THIS CAN
BE EASILY DONE BY INSERTING TWO SCREWDRIVERS BETWEEN WEAR PLATE AND LOWER
BRACKET (43) AND PRYING THE WEAR PLATE LOOSE. ALL THE PUMP PARTS HAVE BEEN
DISMANTLED. REPLACE WORN PARTS.
7. THE OIL DIAPHRAGM (54) IS NOW IN VIEW. UNSCREW BOTH THE OIL PLUGS (45) AND
DRAIN OUT THE OIL FROM THE OIL CHAMBER. LOOSEN SCREWS AND NUTS (55/56) FROM THE
BIG OIL CLAMP (58) AND REMOVE CLAMP. TURN OIL DIAPHRAGM INSIDE OUT AND REMOVE
SMALL OIL CLAMP IN THE SAME FASHION. REMOVE OIL DIAPHRAGM. SLIDE OFF OUTER
RETAINING SNAP RING/CIRCLIP (48) 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 (49). UNSCREW
FOUR NUTS (52) AND PULL OUT SEAL HOUSING (49). THE STATIONARY TC 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.
