MAINTENANCE EVERY 250 OPERATING HOURS 29.6.5 CHECKING THE FILTER CARTRIDGE Usually, it is required to check each air filter cartridge before it is re-installed. For this purpose, insert a lamp into the cartridge and visually check the filter paper against the transmitted light. If you detect small holes or spots on which the paper is thin, the in- sert is defective and must be replaced. Check filter cartridges for damaged seals. Also new filter cartridges must be checked before they are assembled. 29.6.6 ASSEMBLING THE AIR FILTER CARTRIDGE 1 - Check the safety filter for proper fit.
2 - Insert the filter cartridge into filter housing in such a way that the seal of the insert locks firmly on the collar of the housing rear panel. 3 - Assemble the air filter cap. If the control lamp lights up again after a short time, you must replace both, the air filter cartridge and the safety fil- ter. 166 75 250 _ 75 250