Chapter 2: Maintenance; Maintenance; Oil; Changing The Oil - MTD AC3 Professional Shop Manual

MAINTENANCE

The information in this manual applies to the AC3 series of engines. Some basic principles may apply to engines
produced by other manufacturers.
As the saying goes "an ounce of prevention is worth a pound of cure". The same can be said about preventive
maintenance on outdoor power equipment. By changing the spark plug, air filter, and oil at recommended intervals
many failures can be avoided. Sometimes just clearing off yard debris that has collected through use can make the
difference between a properly running piece of equipment and the expensive inconvenience of unplanned repairs.

Oil

Figure 2.1

Changing the oil

The first oil change should be done at 10 hours and then it should be changed every 25 hours or at the start of the
season.
Electric start
coupler
Figure 2.2

CHAPTER 2: MAINTENANCE

Oil plug
Oil plug
To check the oil:
1. Clean around the oil plug.
2. Place the trimmer on a level surface.
3. Unscrew the oil plug. See Figure 2.1.
4. The oil should be level with the bottom of the threads.
NOTE: If needed, add oil slowly until oil level is even with
the bottom of the threads.
5. Tighten oil plug finger tight.
To change the oil:
1. Clean around the oil plug.
2. Remove the oil plug. See Figure 2.2.
3. Tip the trimmer to the side and drain the oil in a safe,
approved container.
4. Disposed of the used oil by following the federal,
state and local regulations.
5. Fill the engine with 3.04 fluid ounces (90 ml) of SAE
30 oil that meets or exceeds API SM standards.
NOTE: The spark arrestor should be cleaned and the
valves adjusted at every oil change.
Maintenance
5