Chain Brake (cont.)
Chain Brake Maintenance
■Keep the brake mechanism clean and free of sawdust or debris.
■If the chain brake becomes dam- aged or worn, or fails to completely engage or release the clutch drum, return the saw to your dealer for repairs.
CAUTION!
■ Never start or operate this saw |
while the chain brake is |
engaged! |
■ Never carry the saw by the |
brake lever! Carry the saw by |
Carburetor Adjustments
(Non Emission Compliance Engines Only) | Mixture | |
Choke | Adjustment | |
Screw | ||
Control | ||
| ||
| Idle Adjust- | |
| ment Screw |
35715
OPERATION
35721
Chain Brake Inspection
(engine “off”)
1.Turn the engine Òoff,Ó and make sure the ignition switch is in the ÒOÓ or ÒoffÓ position.
2.Hold the saw with the bar tip 12 to 20 inches
3.Quickly release the front handle, allowing the guide bar tip to strike the wooden block.
4.The chain brake must engage as soon as the bar tip strikes the wood.
WARNING!
The above procedure must cause the chain
brake to engage! If the chain brake does not fully engage during this test, do not operate the saw! Return the saw to your dealer for repairs!
the front handle. |
■ Always disengage the chain |
brake before removing or |
replacing the clutch cover! |
■ Never make carburetor |
adjustments while the chain |
brake is engaged! |
A clean and unrestricted airflow is essential to your saw engineÕs perfor- mance and durability! Before attempt- ing any carburetor adjustments, inspect and clean the engine air filter as required! Procedures for maintain- ing this sawÕs air cleaner are described on page 27 of this manual.
Before starting the engine
1.Inspect saw chain tension, and adjust if necessary. (see page 13)
2.Make sure the chain brake is disengaged, and that the saw chain is free to rotate.
Start the engine, warm the engine to operating temperature. Place the saw on the ground, and adjust the caburetor as follows:
Idle speed adjustment
(engine idling)
Use a screwdriver to slowly turn the idle speed adjusting screw in or out until the engine idles at
WARNING!
The saw chain must never rotate at engine idle speed!
Low and High Mixture Adjust- ments for Emission Compliance Engines.
Low Speed Mixture (engine idling at operating temperature)
1.Using a small screwdriver, slowly turn the low speed mixture screw clockwise (lean mixture), and note any changes in engine rpm. See illustration above.
2.Next, turn the low speed mixing screw
3.Adjust the low speed mixture screw to provide the smoothest possible idle with no sacrifice in accelera- tion.
4.If necessary, readjust the idle speed screw for an engine idle speed of
High Speed Mixture
OPERATION
22 | 19 |
