3to 11hp 4-cycle l-head engines - Small Engine Suppliers
3to 11hp 4-cycle l-head engines - Small Engine Suppliers
3to 11hp 4-cycle l-head engines - Small Engine Suppliers
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CHAPTER 7 FLYWHEEL BRAKE SYSTEMS<br />
GENERAL INFORMATION<br />
Tecumseh’s brake systems provide two methods of meeting compliance standards which has become a federal<br />
law as of June 30, 1982. There are two additional methods used by equipment manufacturers that also meet<br />
compliance standards and they are as follows:<br />
1. Use of the blade brake clutch in conjunction with either a top or side mounted recoil starter or 12 volt electric<br />
starter. The blade stops within three seconds after the operator lets go of the blade control bail at the operator<br />
position and the engine continues to run. Starter rope handle is either on the engine or on the equipment<br />
handle.<br />
2. Use of a recoil starter (top or side mounted) with the rope handle on the engine as opposed to within 24 inches<br />
(60.9 cm) of the operator position. This method is acceptable if the mower deck passes the 360 degree foot<br />
probe test. A specified foot probe must not contact the blade when applied completely around the entire blade<br />
housing. This alternative can be used with engine mounted brake systems and typical bail controls. The blade<br />
stops within three seconds after the operator lets go of the engine/blade control bail at the operator position.<br />
Tecumseh’s Flywheel Brake system provides consumer safety by stopping the engine and blade within three<br />
seconds after the operator releases the engine/blade control bail at the handle of the lawnmower. These systems<br />
are available on both recoil and electric start models. The engine stopping time is affected by the engine R.P.M.<br />
Consult microfiche card #30, the Plus 1 or Parts Smart Look-Up system, or Service Bulletin #107 to determine the<br />
correct engine RPM or blade tip speed.<br />
OPERATION<br />
BOTTOM SURFACE SYSTEM<br />
In the stop position with the handle mounted engine / blade control released, the torsion spring rotates the brake<br />
lever forcing the brake pad against the underside of the flywheel, actuates the ignition kill switch and on electric<br />
start models, opens the starter interlock switch (diag. 1).<br />
In order to restart the engine, the handle mounted engine / blade control must be applied. This action pulls the<br />
brake pad away from the flywheel, opens the ignition kill switch and on electric start models, closes the starter<br />
interlock switch. This will allow the engine to be started by energizing the starter with a starter switch (diag. 2).<br />
BRAKE<br />
APPLIED<br />
BRAKE<br />
RELEASED<br />
IGNITION<br />
SHORTED<br />
IGNITION<br />
OPEN<br />
INTER-LOCK<br />
SWITCH OPEN<br />
INTER-LOCK<br />
SWITCH CLOSED<br />
1<br />
2<br />
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