Replacing The Bellows - M&C TEC1 Series Operation Manual

2. Install the upper pump head A and then the pressure ring H again. Align both so that the screws fit
into the threads in the housing.
3. Check that the bellows are seated correctly. The bellows must be attached to the connecting rod.
4. Fasten the pressure ring H with the four hexagon socket screws G. First tighten the screws by hand.
Start lightly to tighten one screw. Tighten the opposite screw to the same amount, then select the
adjacent pair. Repeat in the same sequence, going for a hand-tight setting.
5. Then tighten the four hexagon socket screws alternately in the same sequence with a torque to a
value of 5 Nm (3.69 ft/lb).
6. Screw the crankcase cover back on again. Tighten the three hexagon socket screws F (wrench 3
mm) by hand.
15.2

Replacing the bellows

Note
To replace the bellows, proceed as follows:
1. Unscrew the crankcase cover. To do this, loosen the 3 hexagon socket screws F (3 mm spanner).
2. Loosen the four hex socket screws G (3 mm spanner).
3. Remove pressure ring H.
4. Remove upper pump head A.
Caution
5. Remove lower pump head D. For easier removal of the lower pump head D, please close one of
the boreholes in the valve seat with your fingers and blow pressured air into the other borehole.
This will loosen the lower pump head D.
6. Unscrew the bellows E from the connection rod. Please make sure to leave any spacers which
might be there, on the threaded pin.
7. Screw new bellows hand-tight onto the connection rod.
After replacing the bellows, please follow these steps to re-assemble the pump:
1. Put lower pump head D back into place.
2. Insert O-rings C into the grooves, and place valve plates B back into the cleaned valve seats. Make
sure that the valve plates are in the correct position.
Note
26
If you replace the bellows, we also recommend to replace the O-rings
C at the same time.
Turn pump head A only to the right and upwards. This prevents the bel-
lows from loosening from the connecting rod.
On the pressure side, the smooth side of Valve B is facing downwards,
and on the suction side, the smooth side of Valve B is facing upwards
(operating direction is marked with an arrow on the pump head).
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