Systems / Brake
The extension spring assembly on the parking brake system controls the neutral
state of the caliper arm. This is accomplished from factory settings where
there is a set preload on the spring in its normal state. The preload ensures that
continuous force keeps the caliper arm engaged. In addition, there is the
ability to adjust the brake holding force by adjusting the spring.
The Pro-Turn 300-500 uses cam style calipers secured to a disc brake system.
The calipers are engaged when the parking brake is set by pulling on
the caliper arms, which are activated by spring assemblies. When the caliper
arm is pulled rearward, the cam in the caliper rotates to engage the
brake pads with the rotor.
The brake activation linkages connect the brake weldment and front cross-shaft to
the rear cross-shaft and springs. When the parking brake is pulled to be set,
the activation linkages will pull forward using a cam feature to rotate the rear
cross-shaft and extend the spring assembly.
There are eccentrics on each side of the brake system which are mounted to the
steering control linkages and are used to set mechanical neutral for the unit.
This is a part of the parking brake interlock system. With the parking
brake fully engaged, the brake interlock should align with the eccentric.
If out of alignment, mechanical neutral needs to be adjusted by adjusting the eccentric.
The Pro-Turn 300-500 uses a disc style brake hub that mounts onto the output shaft
of the transaxles. The rotor on the hub will remain in place with the caliper pads
when the parking brake is engaged. In order to remove the brake hub, you will need
to remove the cotter pin, retaining nut, and use a 5-hole hub puller. Be cautious
upon removal with the caliper pads to ensure they do not fall out.
NOTE: The Pro Turn 300 and Pro Turn 500 use different brake rotors
because of the different transaxles used on each model.
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