Service kit
for
MD 4
VARIO-SP
(diaphragms, valves, O-rings)....................
696834
Service kit
for
MZ 2 VARIO-SP
(diaphragms, valves) ..................................
696835
O-ring 28 x 1.5
(4x for MZ 2 VARIO-SP) .....................................................
637090
Diaphragm key
(w/f 66) ..............................................................................
636554
The valves and diaphragms are wear parts. If the rated
ultimate vacuum is no longer achieved or in case of in-
creased noise level, the pump interior, the diaphragms
and the valves must be cleaned and the diaphragms and
valves must be checked for cracks or other damage.
All bearings are encapsulated and are filled with long-life
lubricant. Under normal operating conditions, the drive
system is maintenance free.
In demanding circumstances, it may be efficient to check
and clean the pump heads on a regular basis. In normal
use, the lifetime of the diaphragms and valves is typically
15,000 operating hours (at 1500 rpm). Operating the pump
at reduced speed will increase the lifetime accordingly.
- Prevent internal condensation, transfer of liquids or
dust. The diaphragms and valves will be damaged if
liquid is pumped in significant amount.
- Carry out maintenance frequently if the pump is ex-
posed to corrosive media or in case of deposits.
- Regular maintenance will improve the lifetime of the
pump and also protect both users and the environment.
Tools required (metric):
- Diaphragm key width 66 mm
- Open end wrench width 17 / 20 mm
- 5 mm wide Allen key
