Chain Brake

Chain Brake Operation

This saw is equipped with a dual func- tion chain brake designed to stop the saw chain from rotating whenever kick- back occurs.

WARNING!

The chain brake is installed only to reduce the risk from kickback! The chain brake is not a substitute for careful operation!

WARNING!

The chain brake system for this unit type 502s is not adjust- able! If the chain brake fails to stop the chain when activated, DO NOT USE THE SAW! Return the saw to your dealer for repairs.

IMPORTANT!

Release the throttle whenever the chain brake is activated!

1.Engaging the brake lever causes a brake band to tighten around the clutch drum, stopping the saw chain.

2.The chain brake is designed to engage whenever the brake lever strikes the operator’s hand or from the inertial effects of kickback.

3.The chain brake can also be activated by pushing the brake lever forward manually.

To release (disengage) the chain brake, pull the brake lever rearward, towards the front handle until a positive stop is felt.

Chain Brake Testing

Step 1: Inertia Chain Brake Function (engine “OFF”)

WARNING!

Step 1

 

Both of the following testing procedures must cause the chain brake to engage and prevent the saw chain from moving! If the chain brake does not fully engage and prevent the saw chain from moving during either test, DO NOT OPER- ATE THE SAW! Return the saw to your dealer for repairs!

Use the following procedure to test for

2. Hold the chain saw normally, gripping

proper operation:

the rear handle with the right hand

1. Turn the engine “OFF,” and verify

and the front handle with the left hand.

While keeping the chain saw level, hold

that the ignition switch is in the “O” or

the nose of the guide bar approximately

“OFF” position.

14” (35 cm) above a solid wood block.

 

Step 2: Manual Chain Brake Function (engine running)

3.Release the front handle only and allow the guide bar nose to drop onto the wood. The chain brake lever should move forward to position 2 and activate the brake as soon as the nose strikes the wood block. Wearing gloves, make sure that the saw chain cannot be pulled around the guide bar.

Use the following procedure to test for proper operation:

1.Start the saw and warm the engine to operating temperature.

CAUTION!

Operating the saw at wide open throt- tle for longer than 5 seconds without a load could result in engine damage.

2.With the saw on a flat stable surface, main- tain a firm grip on the rear handle with the right hand and the top of the front handle with the left hand. The left hand should be centered with the front hand guard.

3.Accelerate engine to full throttle, then, without releasing the front handle, roll the left wrist forward against the front hand guard/chain brake lever to push the brake lever forward until the chain brake activates (position 2). The saw chain must stop immediately. If either of step 1 or step 2 tests fail, contact an authorized Shindaiwa dealer for repairs.

Step 2

1Chain Can Move

2 Chain

Stopped

Chain Brake Maintenance

CAUTION!

Never start or operate this saw while the chain brake is activated!

Periodically clean the brake mecha- nism of sawdust or debris.

If the chain brake becomes damaged or worn, or fails to completely engage or release the clutch drum, return the saw to your dealer for repairs.

Never carry the saw by the brake lever! Carry the saw by the front handle.

Always stop the saw and disengage the chain brake before removing or replacing the clutch cover!

Never make carburetor adjustments while the chain brake is engaged!

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Shindaiwa 69033-94310, 502s manual Chain Brake Testing, Chain Brake Maintenance

69033-94310, 502s specifications

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