Hydrostatic Transaxles
77
Brakes
The brake rod pulls on a spring that is hooked to the
cam-arm on the brake caliper. The cam-arm forces two
pins inward against a backing plate and brake pad. The
pad forces the floating rotor against a second pad located
behind the rotor. The pinching action creates the friction
necessary to stop or hold the tractor.
A return spring pulls the cam arm back to relieve the
friction when the brake pedal is released. See Figure 6.5.
Slightly above and behind the brake assembly is the fric-
tion pack. The friction pack maintains a set amount of
resistance in the control linkage. See Figure 6.6.
Too much resistance may raise control effort to an unac-
ceptable level. This would be caused by an over-tightened
nut on the friction pack.
Too little resistance may allow the linkage to drift back to
neutral, particularly when ascending a grade conforming to
the 15 degree description in the Operators Manual. This
condition may indicate that it is necessary to tighten the
friction pack nut slightly.
•The brake is properly adjusted when a 0.015”
(0.381 mm) feeler gauge will slip between the pad
and the rotor.
• Brake adjustment is made by removing the cotter
pin from the castle-nut and rotating the nut to
tighten or loosen the clearance between the pads
and the rotor. There is no linkage adjustment.
• Replace the cotter pin with a new one after mak-
ing any brake adjustment.
•A tight or stuck brake can cause symptoms simi-
lar to low fluid: noisy operation and sluggish perfor-
mance. In addition to these symptoms, the brake
will become extremely hot, and the rotor will
become discolored.
• The factory setting on the friction pack is to torque
the nut to 100 in-lbs (11.3 n-m), then back the nut
off one full turn (360 deg.).
NOTE: This setting should result in about 5 lbs (2.67 kg.)
of resistance in the lever, measured as near the
end of the lever as possible.
See Figure 6.7.
NOTE: A belt tension checker such as that manufactured
by Browning is useful for checking control resis
-
tance.
Figure 6.5
Return spring
Cam arm
Brake rod
Extension spring
Figure 6.6
Friction pack
Figure 6.7
Measuring control
force
FOR DISCOUNT PARTS CALL 606-678-9623 OR 606-561-4983
www.mymowerparts.com
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