Diaphragm Vacuum Pumps N86.16
Servicing
Translation of original Operating and Installation Instructions, english, KNF121260-121531 04/20
23
2. Place the intermediate plate (
3
) on the carrier (
1
) in the posi-
tion indicated by the felt tip pen mark (M).
3. Lay the new valve plate (
11
) onto the intermediate plate (
3
).
Regarding the placement of the valve plate:
The notch on outer edge of the valve plate must be at the left
rear, when looking at the pump from the motor.
4. Fit the new O-ring (
10
) in the head plate (
4
).
e) Refitting pump head
1. Place the head plate (
4
) on the intermediate plate (
3
) in the po-
sition indicated by the felt-tip pen marking.
2. Place disk springs (
5
).
For position see Fig. 6.
3. Put the nuts (
6
) in place and tighten them diagonally, until each
of them lies level on the top spring washer; realign the pump
head.
From when you start applying pressure on the disk springs,
tighten the nuts through an angle of 340°. That is equivalent to
a tightening-torque of 80 Ncm.
After opening the pump head, or replacing the diaphragm and
valve plate the initial gas-tightness is no longer guaranteed. A
leak test is able to verify that the original standard of gas-tight-
ness has been achieved.
f) Final step
1. Reconnect the pump to the electricity supply.
2. Ensure that the discarded parts and materials are safely and
correctly disposed of.
If you have any questions about servicing call our technical adviser
(contact data: see www.knf.com).
