by increasing the excess pressure as explained below, BUT this will ONLY work, IF pressure
switch P1 is not defective!
The hyd. pump excess pressure has been factory adjusted to:
FWD: 60-70 bar (800-1000 psi)
HWD: 75-85 bar (1050-1200 psi).
This setting must at all times exceed the P1 setting, which is:
FWD: approx. 40 bar (560 psi)
HWD: approx. 60 bar (850 psi)
which in turn must be higher than the pressure needed to raise the drop weight subassembly with
maximum weight set-up, even under cold conditions (this pressure is normally at least 10 bar
(150 psi) lower than the P1 settings listed above). NOTE, though, that a too high excess pressure
may cause excessive wear on especially the catch mechanism.
The adjustable excess pressure valve is located on the hyd. pump housing (see previous
hydraulics figures). To adjust, use the following procedure:
1) Lower the plate to the ground (OR settle it on the transport locks).
2) Release all hyd. pressure by manually activating the A and B valves (at least twice).
3) Remove the dome nut of the excess pressure valve.
4) Remove the washer and “O”-ring (which were behind the dome nut).
5) Loosen the nut locking the adjustment screw.
If a pressure gauge is available, then you may proceed from step 12 below, otherwise continue
here:
6) Turn the adjustment screw CLOCKWISE HALF a revolution (and NOT MORE than half
a revolution!!).
7) Check that the P1 LED of the Compact15 Front Panel now turns OFF, when the LC
button is pressed (MAN.KEY ON). Make sure that the catch is LOW and that the trailer
buffer battery is in a well charged condition when performing this check.
If step 7) was fulfilled, then further adjustment should not be necessary, and you may re-mount
washer, O-ring and dome nut as explained below (steps 14 and 15). As soon as possible after
this, though, the pressure should be checked using a pressure gauge (as outlined below in steps
12 through 16).
If step 7) failed (P1 LED will NOT turn OFF), then this MAY be due to a defective P1. If a
pressure gauge is still not available, then replace P1 with the spare one provided with the
standard Spare Parts Kit and then repeat step 7). If this STILL fails, then a pressure gauge must
be acquired and used as explained below (from step 12). If step 7) checks out OK with the new
P1, then re-adjust the excess pressure as follows:
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