Reducer of Fluid oXidation
Maintenance and regular checkups
HYDAC FILTER SYSTEMS GMBH
us
Page 20 / 28
MoWa RFX 3570845 us 2010-08-20.doc
2010-08-19
Maintenance and regular checkups
The RFX has no wear details or other details which need continuous maintenance or
exchange.
Proactive maintenance for The RFX is therefore only control and cleanliness. Most of the
points can be checked at once. Check if the following six points are normal.
1. Working period with 2-4 minutes cycle time
Oil level variation shall follow the patch described on page 4. Check the supply pressure with
a gauge.
* Too low inlet pressure: The piston is not reaching the upper position.
* Too high inlet pressure: The oil level is constant or rising even if the liquid level float
changes to its upper position.
2. Normal foam thickness
This is a check that can be made daily. If there are changes you must figure out what the
cause to this change is.
a. Foam thickness is higher than normal foam thickness
* If the oil temperature is steady, this can be a sign of air entering the system somewhere or
that the system recently has been maintained leaving entrapped air in the system. This can
be verified by a larger A-distance than normal. In that case check the suction lines of the
pumps.
* Exceeded foam thickness can also be a sign of water entering the system. Check the
system or the oil. If temperature on the top or bottom block is lower than normal, the foam
thickness will be high due to exceeded water release. The water level can therefore be
normal but the the THE RFX unit is working under better conditions.
b. Foam thickness is lower than normal or totally missing
This can be a normal effect if the temperature is rising on the top or bottom block. Check the
A-distance. If the distance is normal, there is no reason to make any changes. A new normal
condition is achieved. If the A-distance is larger than it used to be there is a reason to check
that the the the THE RFX unit is working correctly by the following procedure:
Check if the piston rod reaches the top block (See point 5 in start up). Two reasons are
possible if it does not reach the top:
* Supply pressure is low. Check with a pressure gauge and adjust if necessary.
* A high pressure >1 atmosphere inside the glass tube. A sign of this is a large A-distance,
>100 mm. Try to make a new start up procedure for the RFX described on page 6.
The next step is to check the vacuumpump. Put your finger on the drain adapter. When the
piston rod moves downwards air should come out through the drain adapter. If you cannot
feel this put a transparent hose on the hose adapter and fill it with some fluid. Hold the hose
like a U. Air should now come out when the piston rod moves downwards and no air shall go
backwards when the piston rod is moving upwards. If there is no motion at all in the fluid
there can be two reasons:
1. The adapter is not sealed by its o-ring. Check that the o-ring 14x3 mm is correct. Repeat
the U-test after mounting.
2. An inner check valve is damaged. The unit needs repairment. Send it to the dealer.
