Copyright by Pister Kugelhähne | Vogesenstraße 37 | D-76461 Muggensturm | Stand:10/2017
2
Service and maintenance manual
Hand-operated PISTER Multicoupler PMK®
Figure 5: Replace of seal ring
A. Identify leaky coupling plug
B. Push in the valve 14 of the plug with a screwdriver and pick out
the defective seal ring 13 with a spiky object.
C. Press the new seal ring together and put it with the open side
downwards on the valve 14.
D. Push the valve 14 downwards to the notch, locate the screwdri-
ver in the middle of the seal ring and remove the hand.
E.
Let the seal ring spring into the notch.
F.
Remove the screwdriver. The valve 14 has to move upwards. If
necessary push the seal ring again until the valve moves up.
Replace the coupling plug if the problem cannot be solved.
5. Leakage at the hydraulic locking device HV
Figure 6: Hydraulic locking device HV
Hint
A small oil film on the piston of the hydraulic lo
-
cking is normal and is not a leakage. Are there
larger leakages between the piston and the pi-
ston cover, the hydraulic locking device has to be
replaced. Is the leakage between the HV and the
hollow screw or rather between the HV and the
coupling plug, the particular seal ring can be re-
placed.
Attention
Switch off motor, depressurize system!
Disconnect PMK system
Course of action:
•
Remove the anti-twist plate, unscrew the 3 screws on the top
•
Untighten the hollow screw by holding the coupling plug with an
adequate tool. Replace the defective seal ring
•
Connect PMK. Check if the piston of the HV moves out under
pressure. Only this prevents an unintentional disconnection un-
der pressure!
Replace the hydraulic locking device if the problem cannot be solved.
Attention
safety device! Repair of the hydraulic locking de-
vice is not allowed!
hollow screw
piston
piston cover
coupling plug
anti-twist plate
seal rings
