Simplicity CFC Series Operator's Manual page 51

MOWER PTO BRAKE
With the PTO lever engaged {forward position), the PTO belt
is kept in tension by a stationary spring on the idler pulley.
When the PTO lever is released, a brake band is engaged
around the brake disc on the PTO jackshaft. The brake must
stop the mower within seven seconds.
To adjust the brake, loosen the nut on the backside of the
rear brake band capscrew (A, figure 34). Capscrew can be
moved forward or backward in slot.
Figure 34.
A. Rear Capscrew B. Brake Band C. Spring
Adjustments
PTO IDLER BELT RETAINER
The belt retainer (A, figure 35) should be from 1/16" to 1/8"
from the idler pulley (B). It should be positioned so that it
tends to push the belt out of the engine pulley (C) when the
PTO lever is disengaged. Belt retainer should not pinch or
bind the belt when PTO is engaged.
Figure 35.
A. Beit Retainer
B. PTO Idier Pulley
C. Engine Pulley
D. PTO Belt
E. PTO Pulley
49