Kunz MR44K, MR44B owner manual Disengaged Spring Length, Brake Stud Clearance

With the clutch engaged, adjust the nuts on the spring-loaded idler adjuster bolt until the length of the spring is approximately 2-3/4”. This is the initial belt break in spring length. When the belt is broken in after several hours of mowing, the running spring length should be between 2-3/4” and 3-1/4”. For maximum belt life, periodic checks every 3-4 hours should be done to make sure the spring length has not exceeded the recommended running length.

Note: Failure to periodically adjust the belt tension will result in severe belt wear and premature belt failure.

This model comes with a belt brake, which is a safety feature that stops the blades from turning after the clutch is disengaged. The only time the brake should be in contact with the belt is when the clutch is disengaged.

CAUTION: The brake stud may need to be adjusted if there is significant belt wear or if a different size belt is used. If the brake stud is not adjusted correctly, the blades will still spin even though the clutch may be in the disengaged position. Always shut mower engine off before servicing.

Under normal operating conditions and when using the Kunz Engineering belt (Part # 238007) the brake stud should require very little adjustment. Periodic brake stud inspections should be performed every 10 hours. In more severe cutting conditions, more frequent inspections may be necessary. There are two parts to inspecting the brake stud. Those two inspections are the disengaged spring length and brake stud clearance.

Note: It is quicker to perform the disengaged spring length and brake stud clearance inspections if done simultaneously.

Disengaged Spring Length:

This inspection must be performed to make sure that there is proper braking force to prevent the blades from spinning when the clutch is in the disengaged position. With the clutch in the disengaged position measure the spring length. The spring must be between 3-1/4” and 4” to provide the appropriate braking force. If the spring length is over 4” it will be necessary to adjust the brake stud closer to the belt. If the spring length is less than 3-1/4” it will be necessary to adjust the brake stud further away from the belt. To make brake stud adjustments loosen the bolt on the top of the brake stud and slide the brake stud in the slot. When the proper disengaged spring length is achieved, tighten the bolt on the top of the brake stud. For this procedure do not adjust the spring length. The spring length should only be changed when adjusting the belt tension.

Brake Stud Clearance:

This inspection is necessary to prevent over-braking. To inspect the brake stud clearence it is easiest to remove the left belt sheild and observe from the left side. With the clutch engaged, check to make sure that there is at least 1/2” of clearance between the brake stud and the belt. If the clearance is less than 1/2” then it will be necessary to adjust the brake stud away from the belt. Keep in mind that the disengaged spring length must stay between 3-1/4” and 4”.

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