Warner Electric Garden Tractor Clutch User Manual

Garden Tractor Clutch
P-1097-6 819-0458
Troubleshooting and
Installation Guide
Contents
Coil Springs
Field
Rotor
Top V iew from Pulley
Armature Assembly
Sleeve
Armature
Face
Armature/Brake Plate Contact Surfaces
Brake Plate
Airgap Preset at Factory
Airgap Adjustment Nuts
Armature/Spring Rivet joints are located in line with the bearing stakes
Three, equally spaced, bearing staking punch marks
Failure to follow these
instructions may result in product damage,
Troubleshooting Checklist . . . . . . . . . . . . . . . . 3
Electrical Evaluation. . . . . . . . . . . . . . . . . . . . . 4
Airgap Adjustment . . . . . . . . . . . . . . . . . . . . . . 6
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Antirotation . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Antirotation Requirements . . . . . . . . . . . . . . . 13
Warranty . . . . . . . . . . . . . . . . . . . . . . Back Page
equipment damage, and serious or fatal injury to personnel.
Bearing Mounted Electric Clutch/Brake Assemblies and Operation
Components
An electric clutch/brake or clutch consists of three primary components:
1. Field Assembly
The clutch's "power" source contains the coil which generates magnetic force. Most common applications require a 12 volt DC coil, although other voltages are available.
2. Rotor Assembly
Generally, the input of the clutch. Includes a keyed hub which mates with the keyway in the drive shaft. The rotor transmits torque from the drive shaft to the output, or armature assembly.
3. Armature Assembly
Generally, the output of the clutch. Also contains the mechanical brake in a clutch/brake assembly. The armature transmits torque from the rotor to the driven load.
The sleeve is a secondary component. This sleeve serves as a spacer between the rotor and the field assembly, and is also a support for the field assembly bearing.
Warner Electric • 800-825-9050 P-1097-6 • 819-0458
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Bearing Mounted Clutch/Brake Assembly
Troubleshooting PTO Clutches and Clutch/Brakes
A. Clutch Symptom: Clutch will not Engage
Problem Possible Causes
Low voltage supply • Defective battery
• Faulty charging system
• Bad wiring or connectors Rotor/armature airgap too large • Rotor/armature wear, readjust airgap Zero voltage • Broken lead wire
• Open clutch coil, check coil resistance
• Faulty switch
• Blown Fuse
B. Clutch Symptom: Clutch Slips
Problem Possible Causes
Low voltage supply • Defective battery
• Faulty charging system
• Bad wiring or connectors Overloaded clutch • Improperly sized clutch Contaminated friction surfaces • Engine oil leak on clutch Clutch loose on shaft • Loose mounting bolt
• Mounting bolt too long and bottoms
in shaft before clamping clutch
• Mounting washer too thin and deforms
when bolt is tightened
Clutch not mounted square • Mounting shoulder not square
• Clutch integral key hitting end of keyway
• Chamfer too small on spacer or ground
drive pulley
Broken rivet joints • Loose mounting, replace clutch
C. Clutch Symptom: Noisy Clutch
Problem Possible Causes
Failed bearing • Loose mounting
• Operating Temperature above 250° F
• Bearing Preloaded Axially
Adapter plate rattles against • Some noise is normal: to reduce noise antiorotation pin level, isolate antirotation pin from
frame with rubber
Warner Electric • 800-825-9050 P-1097-6 • 819-0458
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A
C
DB
Meter
Meter
Instructions for Evaluating VX Series Clutches
Windows
Bearing Mounted Field Clutches (self-contained clutch/brake package)
Clutch to be at room temperature - 70° F - for this check.
Step 1. Measure Clutch Coil resistance
1. Turn engine and PTO switch off.
2. Disconnect clutch wire connection.
3. Select meter to check ohms.
4. Connect meter lead wires to the wires in the clutch connector. (Figure 1)
5. If meter reads below 2.40 ohms or above
2.90 ohms, then the clutch has failed and needs to be replaced.
Figure 1
If the meter reads between 2.40 and 2.90 ohms, proceed to step 2.
Step 2. Measure Clutch Current Draw - 12 Volt System
1. Turn engine off.
2. Disconnect clutch wire connection.
3. Select meter to check amps (10 amp scale).
4. Connect one meter lead wire to one wire in clutch connector at A. (Figure 2)
5. Connect the other meter lead wire to the corresponding wire in the mating connector at C. (Figure 2)
6. Connect a short wire from D to B in both connectors. (Figure 2)
Figure 2
Figure 3
7. Turn PTO switch on.
Warner Electric • 800-825-9050 P-1097-6 • 819-0458
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