Karcher HD 7-250 De Tr1 - Manual (Page 79)

Wartung.pm6.5 - GB
Page 4.9
Maintenance
BOGE Operating instructions for CM 9 series screw compressor module
Change: – After 3000 operating hours,
however, no later than after one year.
If the prescribed maintenance intervals are not observed, the oil sepa-
rators might become blocked. In this case, the differential pressure will
increase until the safety valve blows.
– Switch off the compressor using the OFF button.
CAUTION: Risk of injury!
Switch off the main switch and secure against unintentional switching-on.
– Do not touch hot surfaces!
– Slacken screws on service cover and remove cover.
– Pull oil disperser cartridge up out of the o-ring seal.
– Check seat of o-ring.
– Lightly oil bottom of new cartridge in and press into o-ring seal.
– Check o-rings on service cover for damage and replace if necessary.
– Fit service cover and tighten screws.
– Close ball valve at the compressed air outlet.
– Switch on compressor and run till it reaches operating temperature.
– Check tightness of service cover and re-tighten screws.
Change: – After 9000 operating hours,
however, at the latest after two years.
– For other types of oil the appropriate oil change intervals
must be complied with.
The service life of the oil, the oil filter and oil separators is reduced under the
following conditions:
– When the compressor is operated at extreme ambient temperatures.
– When the intake air is extremely soiled.
Building up a pressure cushion
The combined compressed air / oil receiver is located at the lowest point of
the system. Therefore, a light pressure cushion (approx. 1.5 bar system
pressure) must be applied to drain the oil. This pressure cushion forces the
oil through the drain hose into a suitable collecting basin (see fig. 4.6, 4.7).
Changing the oil
separator
(Fig. 4.4)
4.3 Regular maintenance work
Oil change