Pi 4700 NG 40 up to 400
7
10. Installation, operating and maintenance instructions
10.1 Filter installation
Install filter in accordance with the identified flow direction. The filter
head is provided with threaded holes for mounting the filters. Ascer-
tain that the required clearance is provided so that the filter element
and the filter housing can be removed. Preferably the filter should
be installed with the filter housing pointing downwards. The mainten-
ance indicator must be visible.
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.
10.3 When should the filter element be replaced?
1 .
Filters equipped with visual and electrical maintenance indic-
ator: During cold starts, the indicator may give a warning sig-
nal. Press the red button of the visual indicator once again only
after operating temperature has been reached. If the red but-
ton immediately pops up again and/or the electrical signal has
not switched off after reaching operating temperature the filter
lement must be replaced after the end of the shift.
2 .
Filters without maintenance indicator:
The filter element should be replaced after the trial run or flush-
ing of the system. Afterwards follow instructions of the manu-
facturer.
3 .
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 contamination indicatoris 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 to 3 turns.
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. Open the
plastic bag and push 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.
