Warner Electric BBC Clutch Replacement User Manual
BBC Clutch Replacement
P-1246
819-0460
Sparkplug wire must be removed
from sparkplug before beginning replacement
procedure.
A. Replacing the Clutch Assembly
1. Remove the lawn mower blade from the BBC by
removing the blade mounting bolts.
2. Remove the BBC mounting bolt.
3. Remove the clutch assembly from the BBC. Install
the new clutch assembly to the BBC.
Recommended Bolt Torque Thread Type
48 ± 3 lbs.ft. 65 ± 5NM 3/8-24 UNF
48 ± 3 lbs.ft. 65 ± 5NM M10X1.25-6g
Bolt to be grade #8 US, Grade #10 Europe.
Note: Please contact Warner Electric for assistance with other thread
sizes.
5. Reinstall the mower blade.
6. Burnish the BBC per the burnish instructions.
B. Replacing the Brake Assembly
1. Remove the lawn mower blade from the BBC by
removing the blade mounting bolts.
2. Remove the BBC mounting bolt.
3. Remove the clutch assembly from the BBC.
4. Disconnect the customer supplied brake
actuation spring.
5. Disconnect the BBC actuation cable.
6. Remove anti rotation bolt if necessary.
7. Remove the brake assembly.
Note: On some applications the BBC brake
assembly will not easily fit through the space allowed
in the mower deck. In this instance, the mower
engine mounting bolts must be removed and the
mower engine lifted off of the deck so that the brake
assembly can be removed.
8. Install the new brake assembly directly to the engine
crankshaft. In the case where the mower engine
was lifted up, remount the engine to the mower
deck.
9. Reinstall the BBC actuation cable.
10. Replace the clutch assembly.
Installation Instructions
11. Reinstall the BBC mounting bolt. Torque the BBC
mounting bolt to 48 ft-lbs. (65 N-m) for a 3/8-24
UNF or a M10 x 1.25-6g mounting bolt (contact
Warner Electric personnel for assistance with other
thread sizes).
12. Reinstall the customer supplied brake actuation
spring.
13. Reinstall the mower blade.
14. Burnish the BBC per the burnish instructions.
C. BBC Burnish Instructions
Warner Electric strongly suggests burnishing the BBC
whenever either the clutch assembly or the brake
assembly is replaced or if the complete assembly is
replaced. The mower should be fully functional before
this burnish procedure is initiated. The burnish
procedure consists of the following steps:
1. Start the lawn mower engine.
2. Run the mower engine at the maximum engine
speed. Allow the mower engine to run a sufficient
amount of time so that the engine will not stall upon
engagement of the blade.
3. With the engine running at maximum engine speed,
engage and disengage the BBC a minimum of 15
times.
Warner Electric • 800-825-9050 P-1246 • 819-0460
BBC-II Blade Brake Clutch
for Walk Behind Lawnmowers
Blade Mounting Hub
Removal Thread for Disassembly
Mounting Bolt
Brake Actuation Spring Attachment Point
Brake Anti-Rotation Arm
Clutch Actuation Cable Attachment Point
Warner Electric LLC
31 Industrial Park Road • New Hartford, CT 06057
815-389-3771
www.warnerelectric.com
An Altra Industrial Motion Company
• Fax: 815-389-2582
P-1246 819-0460 8/11 Printed in USA
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