304 Maintenance Cleaning the air filter Cleaning the release valve on the air intake duct Maintenance and care The release valve fills accordingly, depending on the nature of the work performed by your vehicle. X Briefly press together release valve : on air intake duct ; . The dust particles in the valve fall out. Draining the compressed-air reser- voir When operating in very dirty conditions, e.g. when mowing, check the air filter and clean it if necessary. Check whether condensed water has collec- ted in the compressed-air reservoir every 14 days.
If the condensation sensor in compressed-air reservoir circuit 1 detects too much condensation, the yellow + Con‐ densation in compressed-air reser‐ voir event window is displayed in the on- board computer ( Y page 135). X To remove the air filter: open the right door. X Remove cover : . X Open catches ; . X Push air filter ? to the left in the direction of arrow = and remove. X To clean: knock air filter ? out and replace if necessary if heavily soiled. X Check the reservoir pressure in the compressed-air brake system ( Y page 161). X Clean housing interior A with a moist cloth. Ensure that no foreign bodies enter the housing. X Switch off the engine. X To replace the air filter:
insert air filter ? and push to the right, in the opposite direc- tion to arrow = , as far as it will go. X Insert cover : . X Close catches ; . X Close the right door.