User Manual

Documents are only to be used and distributed completely and unchanged. It is strictly the users’ responsibility to check carefully
the validity of this document with respect to his product. Manual-no.: 999164 / 19/05/2009
page 56 of 75
Tools required (metric):
- Torx screw driver TX20
- Hex key size 5
- Flat-bladed screw driver 2.5 mm
- Flat pliers
- Diaphragm key w/f 66
Cleaning and inspecting the pump heads (pumps NT VARIO / PC 300x VARIO)
The replacement of the diaphragm and the replacement of the valves can be carried out separately.
☞ To replace the valves, remove the head covers of one side of the pump conjointly with the assembled
valve heads and ttings.
☞ To maintain the diaphragms, the valve heads and the ttings don’t have to be disassembled. The
head covers can be removed conjointly with the assembled valve heads and ttings.
☞ Maintain only one side of the pump at a time.
1: Cylinder pin / mark
2: Connecting rod
3: Housing
4: Washer
5: Diaphragm support disc
6: Diaphragm
7: Diaphragm clamping disc with square
head screw
8: Socket head screw
9: Blind
10: Head cover
11: Square nut
12: Fillister head screw
13: O-ring
14: Valve
15: Valve head
16: Hose nozzle
17: Connection fastener with hinged cover
18: Disc spring
19: Clamping bracket
20: Countersunk screw
21: Hose clip
22: Connection tube
10
1
9
3
2
5
6
7
8
11
18
20
13
12
14
19
16
21
17
22
15
4
View of the disassembled pump head parts
(g.: MD 4C NT VARIO)