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Instruction book
Replacement of valve discs
Operation sequence
Remove the fan guard, unscrew the cap and remove the cover, air filter and cover of the air inlet
silencer(1).
Disconnect cylinder head cover (12) from the inlet and outlet pipe flanges. Remove cylinder head
cover.
Remove spring (3), outlet valve guard (4) and outlet valve disc (5).
Lift off valve seat (6) and remove inlet valve disc (7). Do not remove guide pins (8).
Remove and discard all O-rings.
If necessary, remove the carbon deposits from the inlet valve guard at the cylinder top. Take care that
no dirt drops into the cylinder.
Clean and inspect all parts.
Fit a new O-ring (11). Do not stretch the cord while inserting it in its groove; the ends should meet.
Put a new inlet valve disc (7) into place and install valve seat (6).
Fit new O-rings (9) and (10).
Install a new outlet valve disc (5), guard (4) and spring (3).
Reinstall cylinder head cover (12). Fit new O-rings/gaskets (2) for the pipe flanges. Fit the flange and
cylinder head bolts and tighten them alternately.
Reinstall the fan guard, cover of the air inlet silencer, air filter, cover (1).and cap.
Torque value
Torque value Torque value
M6: 10 Nm ±2 M8: 23 Nm ±2 M10: 46 Nm ±5
6.3 Air filter
To replace the air filter, follow these steps:
1. Stop the compressor.
2. Unscrew the cap on top of the cover. Lift off the cover and the filter element. Take care that no dirt
drops inside the suction silencer.
3. Using a damp cloth, clean the filter chamber and cover. Discard damaged elements.
4. Install the new element, cover and cap.
6.4 Adjustment MDR4 pressure switch
Views of air pressure switch MDR4
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