
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,
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
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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Instructions for Evaluating VX Series Clutches
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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