13
381497 USA 10-2014
APV
3.1 Checking the pump for foreign material
Remove the front cover, air screw and its housing as described below.
Refer to the assembly drawing on page 8.
1. Lock Out power and disconnect from the power supply.
2. Remove the front cover by unscrewing the clamp ring (item 25),
after disconnecting the re-circulation connection (item 30, if fitted)
3. Unscrew the air screw (item 2) (use a pipe C-spanner or a round
bar in the balance hole in the shaft muff to secure the shaft)
4. Remove similarly the housing clamp ring (item 9) and carefully pull
off the pump/screw housing
5. Turn the impeller (item 4) to ensure that there is no foreign
material behind it.
6. If there is any foreign material in the pump, remove it.
7. When the pump is clean and free of foreign material, reassemble
the pump.
8. When mounting the pump/screw housing check that the location
pin (item 8, where fitted) in the top of the back plate (item 7),
mates with the detent in the pump body and press the pump/screw
housing in over the o-ring (item 6). Re-fit the clamp ring.
9. Screw the air screw on to the shaft. Remember the correct
tightening torque - see section 5.2.18.
10. Press the front cover into place and fit the clamp ring.
Re-assemble the re-circulation connection (if fitted).
11. Install suction and discharge pipes. Check that the pipe unions
have been tightened properly and that pipe supports have been
fitted.
To make the front cover and the pump/screw housing easier to fit, we
recommend that you give the o-ring a thin layer of food-approved, acid-
free grease or soap.
3.2 Testing the pump
To check that the pump is working properly, pour water into the pump
and start it for a moment. Check the direction of rotation (Fig. 6). Listen
for any unusual noises.
In pumps with water-flushed shaft seals, the seal chamber must be
filled with water.
Never allow the pump to run without liquid, as this will ruin the shaft
seal.
3. Before start-up
Fig. 6: Direction of rotation
Note: for numbered items,
see assembly drawing on
page 8.
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