Duplex Filter Pi 3700 up to NG 400
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10. Installation, operating and maintenance instructions
10.1 Filter installation
When installing the filter make sure that sufficient space is available
to remove filter element and filter housing. Preferably the filter should
be installed with the filter housing pointing downwards. The mainten-
ance indicator must be visible.
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10.2 Connecting the electrical maintenance indicator
The electrical indicator is connected via a 2-pole appliance plug ac-
cording to DlN EN 175301-803 with poles marked 1 and 2. The elec-
trical section can be inverted to change from normally open to nor-
mally closed position or vice versa.
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10.3 When should the filter element be replaced?
1 .
Filters equipped with visual and electrical maintenance indicat-
or:
During cold starts, the indicator may give a warning signal.
Press the red button of the visual indicator once again only after
operating temperature has been reached. If the red button im-
mediately pops up again and/or the electrical signal has not
switched off after reaching operating temperature the filter ele-
ment must be replaced after the end of the shift.
2 .
Please always ensure that you have original Filtration Group
spare elements in stock: Disposable elements (PS) cannot be
cleaned.
10.4 Element replacement
Note: Elements may only be replaced by people who are familiar
with the function of the filter. When replacing elements, appropriate
safety clothing (protective goggles, gloves, safety shoes) must be
worn.
Note: The maintenance indicator monitors the filter side in operation,
which is identified by the position of the switching lever catch. The
change-over transfer valve must be switched prior filter servicing.
Now the signal of the maintenance indicators cancelled and the red
button can be repressed again.
1 .
Operate and hold pressure equalizing lever located behind
switching lever. Pull catch knob and swivel switching lever. En-
gage the catch on the clear filter side. Place through or drip pan
underneath to collect leaving oil.
2 .
Loosen vent screw of the filter side not in use by 2-3 turns; max.
until contact is made with the safety stop.
3 .
Unscrew filter housing by turning counter-clockwise. Clean the
housing using a suitable cleaning solvent.
Warning: The shift lever may not, from now until the screw-
ing back in of the filter housing (7.), be activated under any
circumstances!
4 .
Remove filter element by pulling down carefully.
5 .
Check o-ring on the filter housing for damage. Replace, if ne-
cessary.
6 .
Make sure that the order number on the spare element corres-
ponds to the order number of the filter name-plate.
To ensure no contamination occurs during the exchange of the
element first open the plastic bag and push the element over
the spigot in the filter head. Now remove plastic bag.
7 .
Lightly lubricate the threads of the filter housing and screw into
the filter head. Maximum tightening torque for NG 40 to 100 =
60 Nm, for NG 160 to 400 = 100 Nm.
8 .
To refill the filter chamber, operate only the pressure equaliz-
ing lever (leave the switching lever arrested in its catch) long
enough for the medium to emerge bubble-free from the vent
bore.
9 .
Tighten vent screw. Check filter for leaks by operating the pres-
sure equalizing lever once again.
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