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,

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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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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