VAF instruments OILCON MARK 6M Technical Manual Download Page 87

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9.3 SAMPLE

PUMP

Drawing

0806-1260

shows the pump/motor and will help to visualize the following:

9.3.1 Disassembling the pump/motor

1. Drain the pump and piping. On the pump casing a drain plug is provided. If repair to the

impeller or rotating parts of the mechanical seal is required, the piping can remain in place.
Otherwise, remove the suction and discharge piping from the pump.

2. Remove the 8 nuts (7) and washers (38) from the pump cover.
3. Remove the cover (5) from the pump casing, preferably utilising the 2 x M6 off-jacking

screws. Be careful not to damage the set of gasket rings (4).

4. If only the impeller (10) is to be changed out, pull it out of the casing. If it sticks, gently use 2

snap grips and apply little force evenly. Be careful not to be injured by the sharp impeller
vanes and also not to damage the impeller. The keyway for the impeller is glued in place in
the factory and should not be disturbed.

5. For access to the mechanical seal (9), the coupling (14) is to be removed. For this purpose,

the impeller can be left in place and be blocked with a tool having a soft end. Be careful not
to be injured by the sharp impeller vanes, and also not to damage the impeller. Loosen the
hexagon socket head cap screw (12) of the coupling (14). Then remove the impeller, and the
bolt (12) with the o-ring (13).

6. Pull the coupling from the motor shaft. For this purpose a M16 thread is provided, enabling

use of a bolt as pull handle. Be careful as the rotating part of the mechanical seal (9) will
come off with the shaft sleeve. Prevent the seal part from striking the pump casing when it
comes off. Do not damage the sealing ring and store it in a clean cloth at a safe place.

7. For further disassembly remove the 3 hexagon socket head bolts (16) from the flange (22).

Pull the pump casing (2) with fitting ring (22) from the main plate. Care should be taken for
the stationary ring of the mechanical seal, this will come off together with the pump casing.
This ring should not strike the shaft, otherwise it may be damaged. Be aware that the key
(31) should be kept in place.

NOTE:
The gas tight seal will be compromised if the following steps are taken. ensure
replacement parts are at hand.

WARNING:
GAS TIGHT INTEGRITY OF THE BULKHEAD WILL BE SHORTLY COMPROMISED.
ENSURE ALL SAFETY REGULATIONS ARE FOLLOWED AND BLANKING PLATES
ARE AVAILABLE IF THE REPAIR OF THE UNIT IS EXPECTED TO TAKE ANY
LENGTH OF TIME.

8. If deemed necessary the rings forming the gas seal can be removed. Remove the oil

reservoir on engine room side of bulkhead. Pull out the first oil seal (25), the lantern ring (26)
and the second oil ring. The oil seals will certainly be damaged and need to be replaced.

9. Clean the oil that will come out of the oil seal chamber.
10. Clean all components and store these at a safe place.
11. Now the electric motor (32) can be removed from the flange (22). Remove the bolts and

washers (23, 24) from the motor flange. Pull the motor from its fitting.

12. Seal the hole of the motor shaft using e.g. tape or a plug diameter 30 mm. Protect the sleeve

on the motor shaft from damage. If a new motor is being installed the bushing (27) is
supplied fitted to the original VAF Instruments spare part.