Operating manual
AQUA S.p.A.
ENGLISH
Page 20
ATTENTION: Do not use rib joint pliers to tighten the valve groups to the liquid end, especially for plastic liquid end version!
It is possible to recognize Suction and Delivery valve kit by looking at the following pictures:
DISCHARGE
SUCTION
DIAPHRAGM REPLACEMENT
1.
Disconnect the pump by the plant, and wash it.
2
Unscrew the valve groups
3
Unscrew liquid end screws (Pos. 509) and remove the pump head (Pos.508)
4
Unscrew the diaphragm (Pos.510)
5
Clean the internal part of the pump head (Pos.508) and diaphragm chamber (Pos.511) with special attention to diaphragm staple
zone.
6
Apply some grease on pushing rod thread (Pos.127).
7
Screw the new diaphragm until the mechanical stop.
8
Mount the pump head following a star scheme screw lock to have a perfect balancement and with a torque of 5 Nm
9
Mount the valve group
PUSHING ROD SEAL REPLACEMENT
1.
Follow the previous sequence until point 4.
2.
Drain the oil by removing the drain plug (Pos.115) recovering it in the bottle supplied with the machine or in another adequate container.
3.
Remove O-ring Pos.132
4.
Set the adjustment to 0%, by turning the knob (A), to allow the advancement of the pushing rod (Pos. 127) ad in this way an easy access.
5.
Remove the seal (Pos. 131) then enlarge the inner lip of the seal with a wrench and plier, insert a flat screwdriver and uncap the seal
rotating the screwdriver, like shown in the picture.
Do not mount a seal once it have been removed.
6.
Place the new seal on its seat on the diaphragm chamber (511) according to the sense indicated in following picture.
Lean EAT2 against the seal (131) and hit with a small rubber mallet until reaching the mechanical stop. Finally, if required, invite the lip
using your finger around the pushing rod (127) being sure it correctly fits. ATTENTION! Pay special attention if using different tools, in
order not to damage the seal, avoiding premature oil leakages!
7.
Screw EAT3 tool on pushing rod, and push the O-ring (132) beside the conic surface reaching the inner lip of the seal (Pos. 131), then
remove EAT3.
8.
Follow the diaphragm replacement sequence from point 5 to the end.
9.
Refill the gearbox with its oil
