|
Potential Problem |
Possible Reason |
Solution |
| If clutch
is able to move on the shaft. |
Check
center bolt and washer to make sure it is tight. If it is tight, make
sure that the shaft is not too long. Clutch shaft should end before the
end of the clutch to allow some deflection in the center bolt and washer
to keep clutch on tightly.
(Example)
|
Retighten
center bolt or change spacer or shaft length. |
|
Noise from pulley bearing. |
Check
if bearing feels rough. Check belt load to make sure pulley and bearings
are not over loaded. |
Reduce
belt load. |
| High
temperature can be caused by either operating environment or due to slippage.
If slippage, clutch should be discolored. Refer to slippage section for
potential reasons. |
Reduce
the heat or eliminate slippage. |
|
Pinging or scraping noise noticed when clutch is disengaged |
Air gap
too close.
(Example)
|
Increase
air gap. |
| Surface
is heavily galled. |
Re-burnish
the clutch. |
|
Noise from field bearing. |
Check
to see if the clutch is discolored to see if it shows signs of slippage.
|
Refer
to slippage section. |
Check
for damage to both the outer race and inner race of the bearing. Make
sure key is not too tight forcing pressure on the inner race . In the
outer race area, check for marks or damage that could have caused the
clearances to close up.
(Example
1, Example
2, Example
3) |
Replace
clutch. |
| Check
temperature of shaft where clutch is mounted to verify that it is under
300\uffffF. |
Reduce
reason for the high temperature overloading on the engine. |
Check
torque tab or backing plate to make sure that there is freedom of movement
of 1/16 of an inch axially and radially. Check to see if any marks are
evident that would indicate axial forces applied.
(Example)
|
Loosen
torque tab to make sure it has freedom of movement both axially and radially.
|
| Noise
is evident when the clutch is first installed and rotated by hand. |
1. Possible
causes are bolts holding the field are not tightened down properly.
|
1. Tighten
bolts |
|
2. Key in key way is not seated properly. This could cause the clutch
to cock to one side.
|
2. Remove
rotor assembly and reset key way. |
|
3. Lead wire is pinched between mounting face and field bracket cocking
field assembly.
|
3. Loosen the bolts, remove the wire and retighten the field mounting
bolts. |
|
4. If set screw version, this could be because of improper air gap
between pulley/armature and field.
|
4. Push
together, then back off .1 inches and retighten set screw. |
|
5. Mounting face in not concentric with shaft.
|
5. Remachine
mounting holes or switch mounting face (by switching you are able to verify
if mounting holes on the clutch are the problem or the mounting holes
on the face are the problem.) |
| Mounting
bracket has come loose from the back of the field assembly. |
Check
to see if projection wells are broken. If they are check to see if rotor
strike has occurred. Possible misalignment in combination of belts and
side load can break projection wells. (Example) |
Replace
the clutch |
