|
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.
|
| Banging
or scraping noise noticed when clutch is engaged. |
Brake
shroud and air gap is set too close. This means that the armatures contacting
the brake while the clutch is engaged. (Example) |
Back off
the air gap to the higher end of the air gap range. |
| Brake
plate rattles. |
In a heavy
vibration application the pin holding the backing plate can become worn
because of the vibration. When the clearances become greater this can
generate noise because of the additional movement of the plate against
the pin. (Example) |
Change
the method of securing the clutch to allow for greater surface contact
so force is spread over a greater area. |
