Maintenance Instructions | ADJUSTMENTS |
Blade Clutch (PTO)
Clutch Disengagement/Brake Action
WARNING
It is important to check and maintain blade brake action for safe operation of the machine.
The declutched or disengaged position of the blade clutch idler pulley is adjustable and is set to give belt release without excessive slack and to apply the blade brake. The blade brake is activated by linkage to the clutch idler pulley mechanism. The brake is designed to stop the blades within five (5) seconds after disengaging the clutch.
Use the following procedure to check and adjust clutch disengagement and brake action:
1.Use the adjustment nut on the brake band (refer to PTO Clutch Disengagement Adjustment illustration) to set the position of the clutch idler pulley in the declutched position. Adjust the declutched pulley position to give 1/2 in.
(13 mm) pulley travel from “clutch engaged” to “clutch disengaged.” To check and adjust the pulley travel, first engage the clutch, then mea- sure the distance the pulley moves down as the clutch is disengaged.
2.After the pulley travel is set, check blade brake action as described in CHECKING/SERVICING the Blade Brake Action in this section. If the brake does not stop the blades within five (5) seconds, check the following:
a.Check clearance between the clutch idler pulley and the motor mount when the pulley is in the declutched position. If there is no clearance and the idler pulley rests on the frame, the blade brake will not be applied when the clutch is disengaged. Normally, this problem would be caused by a short engine PTO drive belt. Change the belt (refer to REPLACING/REPAIRING the Drive Belts in this section), and readjust pulley travel as described by step 1 (above).
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Engine Pulley |
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| Brake Band |
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| Adjustment Nut | |
1/2 in. |
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(13 mm) |
| Clutch |
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| Idler Pulley |
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PTO Clutch Disengagement Adjustment
b.Check both the brake band and brake drum on the drive pulley for wear. Replace worn brake parts and readjust pulley travel as described by step 1 (above).
Clutch Engagement/Belt Tension
The clutch engagement and PTO belt tension are adjusted using the clutch actuator rod. Initially, after installing a new PTO belt, after 10 hours and every 100 hours thereafter, check and adjust for the three dimensions in the clutch linkage as shown.
Adjust the bolt head clearance [1/4 to 3/8 in. (6 to 10 mm)] first, then adjust spring length. If adjustments are needed more frequently than 100 hours to maintain the linkage dimensions, it may suggest problems with pulley wear or belt misalignment.
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