Maintenance (continued)
Cutter blade adjustment
WARNING!
The cutter blades are very sharp! Always wear gloves when working around the cutter assembly.
Cutting performance of your machine depends a great deal on proper cutter blade adjustment. Properly adjusted blades will oscillate freely yet help pre- vent binding of cut material between blades. Adjust blades as follows:
1.Loosen all blade locknuts at least one full turn.
2.Tighten each blade shoulder bolt firmly, and then loosen the shoulder bolts 1/4 to 1/2 turn.
CAUTION!
Operating the trimmer with worn or improperly adjusted cutters will reduce cutter performance and may also damage your machine. Never operate the machine with damaged or worn cutters.
3.Working from the gearcase end, lock each bolt in place by firmly tightening its locknut while prevent- ing the shoulder bolt from turning.
When shoulder bolt adjustment is cor- rect, there should be a gap of 0.25–
0.50mm between the cutter blades and the flat washers, and the flat washer beneath each bolt head should turn freely.
|
| Locknut | |
Guide Bar |
|
| |
Cutter |
| Washer | |
Shoulder Bolt | (should turn | ||
Blades | |||
freely) | |||
|
| ||
Adjusting cutter blades |
| ||
135 - hour maintenance
WARNING!
Never operate the unit with
a damage or missing muffler or spark
arrester! Operating with a missing
or damaged spark arrester is a fire
hazard and could also damage your hearing.
If the engine becomes sluggish and low on power, check and clean the spark arrester screen.
1. | Loosen the knob of the spark plug |
| cover and remove the cover. |
2. | Remove the spark plug lead from |
| the spark plug. |
3. | Loosen the four 5 mm bolts located |
| at the top of the recoil starter hous- |
| ing and remove the cover. |
4. | Loosen the 5 mm bolt located at the |
| top of the cylinder cover and two |
| 4 mm bolts located at the bottom |
| of the cylinder cover and remove |
| cover. |
| Muffler plate screws | Top tail plate |
| Spark arrester screen |
|
|
| Muffler cover |
| Lower tail plate | screws |
| Plate |
|
|
| Muffler |
|
| cover bolts |
Gaskets |
|
|
| Muffler |
|
Gasket plate | gasket | Muffler |
| ||
| Muffler gasket bolt | Muffler |
|
| |
|
| cover |
5. | Loosen three 5 mm muffler cover |
| bolts and remove the muffler cover. |
6. | Remove muffler gasket bolt. |
7. | Loosen two 4 mm screws from the |
| muffler cover. |
8. | Remove two 4 mm screws from the |
| top tail plate and remove tail plate. |
9.Remove the spark arrester screen and clean with a stiff bristle brush.
10.Remove the muffler from the engine and inspect the cylinder exhaust port for carbon buildup.
11.Reassemble the muffler in the reverse order of disassembly
IMPORTANT!
If you note excessive carbon buildup, consult your servicing dealer.
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