BBC / BOS / BCS
BLADE BRAKE CLUTCH SYSTEM
(BBC)
The blade clutch system offers the customer
convenience 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. 146 and Fig. 147).
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 146
3428-0001
Fig 147
3428-0004
6-2
WPM Drive Systems Manual
| Categories | Lawn Mower Manual, Lawn-Boy Lawn Mower Manuals, Toro Lawn Mower Manual |
|---|---|
| Download File |
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| Language | English |
| 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 |
| Document File Type | |
| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
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