BBC / BOS / BCS
BLADE BRAKE CLUTCH SYSTEM
(BBC)
The blade clutch system offers the customer conven-
ience to stop the blade while allowing the engine to
continue to run.
Description
Before troubleshooting the BBC deck mechanism, be
sure that it is adjusted properly. Refer to the BBC cable
adjustment section for proper adjustments.
There are two basic blade clutching system designs.
The first is commonly referred to as the BBC or Blade
Brake Clutch. It has two versions which have been used
on many Toro models as well as Lawn-Boy Medallion
mowers. The second design was introduced in 2005 and
is used on Toro (Blade Override System) and Lawn-Boy
(Blade Clutch System) (Fig. 179 and Fig. 180).
BBC Clutch Operation
The clutch operates by using a flywheel which turns with
the engine crankshaft and a brake drum and blade that
are free to turn separately from the flywheel. The two
are connected by tensioning a drive belt between the
flywheel and brake drum. The combination idler arm and
brake controls the belt. When the control is engaged,
the idler with the brake pad backs away from the brake
drum and tightens the belt. When the control is released,
a spring causes the idler to pivot towards the brake drum
releasing the belt and engaging the brake. This stops the
blade but allows the flywheel and crankshaft to continue
to turn.
BBC Control Box Operation
The BBC control mechanism’s purpose is to actuate
the deck mechanism. It does this by tensioning and
loosening the BBC cable. The control mechanism meets
the federal government’s “2-step” blade engagement
procedure. The traction drive can also be integrated with
this control system.
Fig 179
3428-0001
Fig 180
3428-0004
8-2
WPM Drive Systems Manual
| Categories | Lawn Mower Manual, Parts and Accessories Manuals, Toro Lawn Mower Manual |
|---|---|
| Tags | Toro 16400, Toro 16401, Toro 16575, Toro 16576, Toro 16585, Toro 16775, Toro 16776, Toro 16785, Toro 20003, Toro 20005, Toro 20007, Toro 20008, Toro 20009, Toro 20013, Toro 20014, Toro 20019, Toro 20022, Toro 20023, Toro 20025, Toro 20027, Toro 20029, Toro 20030, Toro 20033, Toro 20038, Toro 20041, Toro 20042, Toro 20044, Toro 20045, Toro 20046, Toro 20048, Toro 20049, Toro 20051, Toro 20061, Toro SR 21OS |
| Model Number | 16576 |
| Model Year | 1990, 1996, 1999, 2001, 2003, 2004, 2005, 2006, 2007 |
| Download File |
|
| Document Type | Operator's Manual |
| Language | English |
| Serial Number | 0000001 - 0999999 |
| Product Name | Toro Lawnmower |
| Product Brand | Toro. Customer Service Representatives are available by phone:
Monday - Friday 7:30 a.m. to 9:00 p.m. (CDT) - Saturday 8:00 a.m. to 8:00 p.m. (CDT) - Sunday 10:00 a.m. to 8:00 p.m. (CDT)
Canada 1-888-225-4886 USA 1-888-384-9939, Lawn Mower |
| Product Type | Walk Behind Mower |
| Swath | 21 inch |
| Discharge | Side |
| Engine Manufacturer | Tecumseh |
| Engine Oil Type | 21 oz. (.62l) 30w or 10w-30 / API SH or higher |
| Engine Motor Model # | TVS100-44021B |
| Engine Motor Type | 4 Cycle |
| Transmission Type | Hand Push |
| Spark Plug | Champion RJ17LM |
| Document File Type | |
| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
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