Gardner Denver L07, Original Operating And Service Manual

Page: 44 / 60

9. Service and maintenance
42
9.4 Oil change
Fig. 17
1 Oil reservoir
2 Oil filler cap R1"
3 Oil-level
indicator
4 Max. oil level
5 Min. oil level
6 Oil drain R1/2"
Danger
Only change the oil when the screw compressor
unit is not in operation and is depressurized!
Be careful when draining hot oil:
Danger of scalding!
Important
Remove oil residues and other deposits from unit
parts and from the coolers of compressors, which
are exposed to hot compressed air, according to
the operating instructions.
Note
Collect the waste oil, do not allow it to seep into the
ground!
Disposal in accordance with the regulations! Do not spill
oil! Check for leakage!
With these compressors, the oil change intervals
strongly depend on the degree of contamination of the
circulating oil. It must therefore be taken care that no
oil-deteriorating matter (dusts, vapours, gases) are
transported through the air intake filter into the oil circuit
of the compressor unit. Also a high content of humidity
in the intake air and the formation of condensate within
the machine affect the service life of the lubricant oil so
that a reduction in the oil change intervals may become
necessary. The specified oil change intervals refer to an
intake air from a normal environment without a high
content of foreign matter (dusts, vapours, gases).
When changing the oil, the waste oil is to be drained
completely, since used oil reduces the service life of the
new oil fill considerably.
Do not mix lubricating oils of different makes. When
changing over to a new oil type, the oil in the oil circuit
must be drained completely.
For the oil change intervals, see maintenance schedule.
When changing the oil, proceed as follows:

Switch the screw compressor unit off and ensure that
it is depressurized, electrically isolate and locked off.

Slowly open the oil filler cap (- 2 - Fig. 17), to
depressurize the screw compressor by releasing
any residual pressure in the unit

Remove the oil filler cap

Open the oil drain (- 6 - Fig. 17) for the pressure
reservoir and the oil cooler

Drain oil at operating temperature

Close the oil drain

Fill in oil up to the marking “maximum oil level”
(- 4 - Fig. 17) (approx. 5 litres)

Close the oil filler cap

Let the screw compressor unit run for approx.
2 minutes

Check for leakages

Switch the screw compressor unit off

Wait at least 5 minutes for the oil to settle and for
the air to disperse

Check oil level (see chapter 6.5)

The oil level must be between the maximum level
(- 4 - Fig. 17) and minimum level (- 5 - Fig. 17)
marked on the oil reservoir.

If required, top up oil
Changing intervals for lubricants
The operating conditions (e.g. coolant temperatures),
the operating modes and the quality of the intake air
(e.g. content of dust, content of gaseous foreign matter
such as SO
2
, solvent vapours) have a strong influence
on the oil change intervals.