Maintenance
29
Checklist for inspec-
tion, maintenance
and overhaul
Certain maintenance and overhaul work should only be performed by Pfeiffer Vacuum
Service (PV). Pfeiffer Vacuum will be released from all warranty and liability claims if the
required, below listed, intervals are exceeded or maintenance or overhaul procedures
are not performed properly. This also applies if replacement parts other than Pfeiffer Vac-
uum OEM replacement parts are used.
Depending on the process, the required replacement intervals for lubricants and the intervals for inspec-
tion, maintenance and overhaul may be shorter than the guide values specified in the table. Consult
with Pfeiffer Vacuum Service if necessary.
7.2
Changing the operating fluid
The service life of the operating fluid is dependent on the application area for the pump.
It must be changed if:
●
The specified ultimate pressure is no longer reached
●
The operating fluid in the sight glass is visibly contaminated, milky, or cloudy
●
The operating fluid is thermally aged, identifiable by its color ID value (applies to min-
eral oils only).
The level of deterioration of organic operating fluids (P3, for example) can be read off
the colour scale in accordance with DIN 51578; request the supplementary sheet PK
0219 BN or download it from the Internet.
Fill the specimen in a test tube or some similar vessel and test by holding against the
light.
Where discolouration is dark yellow to red brown (equivalent to 4 ... 5 on the scale)
change operating fluid.
Turn off the vacuum pump, vent to atmospheric pressure and allow to cool.
Open operating fluid drain screw 90 and drain operating fluid.
Activity
dail
y
as
r
eq
u
ir
e
d
as
r
eq
u
ir
e
d
;
at
l
east
annua
ll
y
as
r
eq
u
ir
e
d
;
at
l
east
eve
ry 2
ye
ars
as
r
eq
u
ir
e
d
;
at
l
east
eve
ry 4
ye
ars
Check operating fluid level
X
Visual inspection (leak-tightness/oil leaks)
X
Check cooling water flow lines
X
Clean cooling water flow lines
X
Clean gas ballast valve
X
Clean the fan cap of the motor
X
Check "V" belt drive
X
Change operating fluid
X
Change "V" belts
X
Replace radial shaft seals
X (PV)
Replace exhaust valves
X (PV)
Replace vanes
X (PV)
Replace bearings
X (PV)
Depending on the applications, Pfeiffer Vacuum recommends determining the ex-
act service life of the operating fluid during the first year of operation.
The replacement interval may vary from the guide value specified by Pfeiffer Vacuum
depending on the thermal and chemical loads, and the accumulation of suspended par-
ticles and condensation in the operating fluid.
