6 © 2001 6.4 Combustion Air Filter Service and Maintenance The amount of dirt in the air cleaner de- pends on the amount of dust in the air and the size of the air cleaner used. If a high level of dust is anticipated, a cyclone-type precleaner can be fitted to the air cleaner. Cleaning intervals will have to be deter- mined from case to case. If dry type air filters are used, cleaning should only be carried out according to the service indicator or service switch. Air cleaner servicing is needed when - Service indicator the red signal 1 is fully visible when the engine is off. - Service switch the yellow pilot light comes on when the engine is running.
After carrying out service work, reset the signal by pressing the button on the serv- ice indicator. The service indicator is now ready for operation again. 6.4.1 Cleaning Intervals © 25 885 1 © 25 885 1