10
6. Maintenance
6.1. Precautionary Measures During
Maintenance Work
Whenever working on the pump ensure the
motor cannot get switched on.
If necessary, remove pump from the system for
inspection. Before dismantling allow the pump
to cool down.
➡
Only dismantle the pump as far is necessary to effect
repairs.
➡
Use only alcohol or similar cleaning agents for cleaning.
Do not use solvents.
All bearings are encapsulated and are filled with long-life
lubricant. The valves and the diaphragms are wear parts. If
the rated ultimate vacuum is no longer achieved, the pump
interior, the diaphragms and the valves must be cleaned and
the diaphragms and valves must be checked for cracks or
other damage.
Depending on individual cases it may be efficient to check
and clean the pump heads on a regular basis.
Service life of the diaphragms and valves
If the pump is operated primarily in Low-speed mode, a life of
> 12,000 operating hours can be expected.
If the pump is operated primarily in High-speed mode, a life of
> 8,000 operating hours can be expected.
6.2. Cleaning And Replacing Valves And
Diaphram
There can be different numbers of washers 17
in each membrane head. Ensure the correct
assignment for mounting when dismantling the
membrane heads. Don’t interchange the
washers 17.
Dismantling the pump
➡
Allow the pump to cool down before dismantling.
➡
Detach intake and exhaust line from the pump.
➡
As far as possible place pump on its side so that the head
to be dismantled points up.
➡
Use open-ended wrench SW 12 to remove fitting 10.1 at
the interhead connection 10 and remove connecting hose
one-sided.
➡
Using an SW 3 key, unscrew the four crosshead screws 11
and remove head cover 12, taking care with the two valve
plates 13 and sealing rings 14.
➡
Remove intermediate plate 15.
➡
Use a small screwdriver to carefully ease out diaphragm
16 and manually unscrew from the connecting rod (right-
hand thread). Look out for possible washers 17.
CAUTION
CAUTION
Mounting the diaphragm heads
➡
All parts should be cleaned only with alcohol or similar
cleaning agents. Please check diaphragm valves and seals
for mechanical damage and replace if necessary. In case
of diaphragm change please use the existing washers 17.
If the washers are missing the pump will not reach final
pressure.
➡
Assemble all parts in reverse order. The connecting rod
should be positioned in the upper dead point when fitting
the diaphragm.
➡
Screw in diaphragm and tighten by hand.
➡
Check correct sealing ring 14 seating.
➡
Assemble membrane heads, ensure correct positioning of
all parts; mind the markings at head cover, intermediate
plate and pump housing.
➡
Re-make interhead connection 10 and re-tighten hose
fitting 10.1.
➡
Test pump for function.
12
16
17
11
Crosshead screw
12
Head cover
13
Valve plate
14
Sealing ring
15
Intermediate plate
16
Diaphragm
17
Washer
Dismantling the diaphragm heads
13
14
15
11
