OPERATION Carburetor Adjustment - Cont'd This engine is designed and manufactured in order to comply with EPA (Environmental Protection Agency) Phase 1 regula- tions. The carburetor is factory set and should not require adjusting. The carburetor will permit only limited adjustment of the “ L ” (Low Jet) and “ H ” (High Jet) needles. Any adjustment should be done by a John Deere Servicing Dealer. Under no circumstances should the “ L ” (Low Jet) and “ H ” (High Jet) needles be forced outside the range of adjustment. Chain Brake Operation Refer to Safety-Chain Brake Section before use. The chain brake Run Position ( A ) and Brake Position ( B ) are illustrated below.
The chain brake operating condition should be checked prior to each use as follows: 1. Start the engine and grasp front and rear handles securely with both hands. 2. Pull the throttle trigger to bring the chain saw up to full speed. Using the back of your left hand, engage the chain brake by pushing the chain brake lever / hand guard toward the bar while the chain is rotating rapidly, see illustration ( C ). 3. The chain brake should engage and stop the chain immedi- ately, if not, take the saw to a John Deere Servicing Dealer for repair and discontinue use until the repair is made. 4.
Reset the chain brake back into the run position by grasping the guide bar side (right side from operator's position) of the chain brake lever / hand guard and pull toward the front handle until an audible click is heard. See Illustration ( D ). WARNING Serious damage can occur to the engine if improper adjustments are made to the “L” and “H” needles. Do not force the “L” and “H” needles outside the adjust- ment range! Idle Speed Adjustment If the engine starts, runs, and accelerates but will not idle; turn the idle speed screw “ T ” clockwise to increase idle speed. If the chain turns at idle, turn the idle speed screw “ T counterclockwise to reduce the idle RPM and stop the chain movement.
If the saw chain still moves at idle speed, contact a John Deere Servicing Dealer for adjustment and discontinue use until the repair is made. WARNING If chain brake does not stop the chain immediately, take the saw to a John Deere Servicing Dealer for repair prior to use. Run Position (A) Brake Position (B) WARNING THE SAW CHAIN SHOULD NEVER TURN AT IDLE. Turn the idle speed screw “T” counterclockwise to reduce the idle RPM and stop the chain, or contact a John Deere Servicing Dealer for adjustment and discontinue use until the repair is made. Serious personal injury may result from the saw chain turning at idle. H L T C D WARNING Weather conditions and altitude may affect carbure- tion.
Do not allow bystanders close to the chain saw while adjusting the carburetor. 14 English