Alcatel Drytel 100 Instruction Manual page 20

SA.2
Changing the diaphragm in
- Lift the housing cover and the head cover as d escribed in the section 5.21
- - The Philips screw (19) in the centre of the diaphragm clamping disc must first be slackened. This is usually
only possible if you carefully turn the upper clamping disc (9) on the diaphragm with a pair of water pump
pliers, because the fixing screw is secured against slackening by adhesive. Take care to not damage the
bearing surfaces of the seals.
- Take great care when removing the underlying support disc (10) of the diaphragm. Spacers can be
inserted between the drive connecting rod and the diaphragm support disc in order to provide
compensation. These spacers must be reused at the same depth.
- If the old diaphragm is difficult to separate from the support disc, loosen it in tri-chloroethylene, petroleum
spirit or kerosene.
- Replace any available spacers under the lower support disc of the diaphragm and fix them in position with
some grease to prevent the spares falling down during assembly.
• Insert a new diaphragm and diaphragm support disc and make sure that this diaphragm is a double
'
diaphragm with an overall thickness of 1.6 mm. When using spare diaphragms, two diaphragms,
each 0.8 mm thick, have to be placed on top of one another (use only factory paired diaphragms with
max. tolerance of 1.6 ± 0.05 mm).
- Insert the diaphragm clamping disc (9)
- Apply a drop of glue adhesive beneath the screw head ( 19) and then screw down the diaphragm and the
clamping disc.
45
the
standard type