Blade Brake System - MTD 700 Series Professional Shop Manual

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700 Series Lawn Tractor

Blade Brake System

The blade brake is a safety system designed to stop the blades quickly when the PTO is disengaged. An exten-
sion spring attached to the idler pivot bracket forces the brake pucks to engage the pulley sheaves to stop the pulleys
from turning. A brake rod connects the brake assemblies for each spindle pulley. Engaging the deck PTO pivots the
idler bracket and disengages the blade brake. As the brake pucks wear, the efficiency of the braking action deterio-
rates. The brake puck is riveted to the brake assembly and must be replaced when it does not function properly.
See Figure 8.26.
To replace the brake assemblies:
NOTE: Cutting decks may vary in appearance, but
the theory of operation is the same. Note the
order of the parts as you disassemble them.
1. Remove the cutting deck from the rider as
described else were in the chapter.
2. Remove the spindle pulley covers if they are in the
way of servicing the blade brake components.
NOTE: You may not need to remove the belts to
service the brake pucks.
Replacing the right side brake assembly
1. Note the layout or orientation of all the components.
2. Remove the extension spring to release tension on
the idler pivot bracket.
3. In this example you can replace the right side brake
puck by removing the 1/4 -20 screw that aligns the
brake assembly with the pivot bracket and pulley.
See Figure 8.27.
4. Remove the 1/4-20 screw and parts that secures the
brake assembly to the pivot bracket. Note the order
of parts for reassembly See Figure 8.30..
5. Install the new brake assembly by reversing the dis-
assembly process.
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Brake pucks
Figure 8.26
Brake assembly components
Figure 8.27