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24 DR ® TRIMMER/MOWER ™ Safety & Operating Instructions
Chapter 5: Maintaining the DR Chapter 5: Maintaining the DR

TRIMME TRIMMER/MOWER R/MOWER 
This chapter covers regular maintenance procedures that will ensure the best performance
and long life of your machine. For engine maintenance, please refer to the engine
manufacturer’s owner’s manual that came with your trimmer.
Paper Air Filter Cartridge: Replace the paper air cartridge every 25 hours of operation.
Replace more frequently if operating in extremely dry or dusty conditions.
Oil: Drain and replace oil after the first 5 hours of operation. Then drain and replace oil
every subsequent 25 hours of operation.
Regular Maintenance
Regular maintenance is the best way to ensure the best performance and long life of your
machine. Below is a list of recommended maintenance procedures. Follow the instructions in
this manual and your engine manufacturer’s owner’s manual.
1. Using a brush or rag, clean any debris from the top and bottom of the machine, cylinder
head fins, blower housing, finger guard, debris guard, filter and muffler areas.
2. Replace the paper air filter and clean the foam filter (if applicable) every 25 hours of
operation. Replace these items more frequently if operating in extremely dry and dusty
conditions.
3. Replace the oil and filter (if applicable) after the first 5 hours and every subsequent
25 hours of operation.
4. Clean the spark plug and replace it if needed. Consult the engine manufacturer’s
owner’s manual for more information.
5. Check the Mow-Ball  Support assembly and clean out any debris.
6. Lubricate the engine throttle cable, trimmer control cable, and idler pulley with
FLUID FILM  or a similar lubricant.
7. Check the Mow-Ball  Support and line plates for wear.
8. Replace broken or frayed cutting cords.
9. Inspect the belt for fraying or stretching. Replace it if necessary.
10. Check the bolts and nuts on the bearing housing assembly. If they are loose, tighten
them. Check all the bolts and nuts occasionally throughout the season to be sure
they’re secure.
Important! You should change the air filters and oil in your DR ®
TRIMMER/MOWER  more frequently than is recommended in your engine
manufacturer’s owner’s manual. Please follow the recommendations
WARNING! Always allow the engine to cool completely and remove
the spark plug wire before performing any maintenance procedure.