Gardner Denver L23, Original Operating And Service Manual

Page: 48 / 64

10 Service and Maintenance
46
The changing intervals can be found in the
maintenance schedule 10.3.
If the fine oil separator is monitored (optional), then a
differential pressure that is too high will be shown in the
control panel of the GD Pilot compressor control. When
the corresponding warning lights up, it is time to change
the fine oil separator.
Fig. 24
Replace the fine oil separator as follows:
•
Switch off the compressor and ensure that it is
depressurized. For this purpose remove the sealing
screw (- 1 - Fig. 24) and open the ball valve
(- 2 - Fig. 24) at the after-cooler until the system has
been vented. Finally, close the valve again and
screw in and tighten the sealing screw.
•
Detach the plastic oil extraction pipe (- 2 - Fig. 23).
•
Detach the plastic control air line (- 2 - Fig. 23).
•
Loosen all hex. screws from the pressure-
maintaining valve (PMV)
• Loosen both screws in the turning direction of the
pressure-maintaining valve and remove them.
Finally the valve will be able to pivot inward.
•
Remove all hex. screws (- 4 - Fig. 23) around the
perimeter of the pressure reservoir cover.
•
Unscrew the cheese-head screws clockwise to lift
the reservoir cover (- 5 - Fig. 23) until the cover has
been raised several millimeters.
•
Pivot the reservoir cover 180°.
•
Remove the used fine oil separator (- 6 - Fig. 23).
•
Clean all seals and if necessary remove and clean
the O-ring (- 6 - Fig. 23).
• Install a new fine oil separator.
•
Pivot the reservoir cover back to the starting position.
•
Screw the cheese-head screws (- 5 - Fig. 23)
counter-clockwise until the reservoir cover is lying
loosely on the pressure reservoir flange
•
Screw in and tighten crosswise all hex. screws except
for the two screws in the pivot area of the PMV.
•
Pivot the PMV back to its starting position and install
it with the corresponding screws. Finally, install and
tighten the last missing hex. screws in the reservoir
cover.
•
Tighten the cheese-head screws used to raise the
reservoir cover (- 5 - Fig. 23) for rotary protection
(clockwise).
•
Properly reinstall all lines to the pressure reservoir
and the oil extractor which have been removed.
Changing times for the fine oil separator
Operating conditions (e.g., coolant temperatures), the
type of operation and the quality of the intake air (e.g.,
dust content, ratio of gaseous foreign substances such
as SO
2
and solvent vapors) have a strong influence on
the filter lifespan (air filter, oil filter, fine separator).
In these cases the intervals between changes may be
shorter
10.7 Change air filter
DANGER
Only perform checks and carry out work on
the screw compressor when the unit is out
of operation, depressurized, and secured
from being switched on again!
NOTICE
Never operate the screw compressor system
without an air filter (even briefly removing it can
cause considerable damage to the machine)!
Fig. 25