TROUBLESHOOTING
Page 65
Noise and Vibration
NORMAL VERSUS ABNORMAL
Noise is the name we give to vibration that
irritates us through our ears. Vibration can be felt
without being heard. Engine operation can cause
vibration and noise throughout a vehicle that we
regard as “normal.”
Abnormal noises and vibrations suggest that
something is not working properly or is not
assembled properly. A damaged driveshaft can
cause abnormal vibration. A loose fastener allows
two surfaces to rub or slap together causing
unusual noise in response to the vibration.
Be sure to discuss noise and vibration issues with
the driver. It is important to discover under what
conditions these occur. Maybe a test drive will be
necessary to familiarize yourself with the details
of the driver's story. Even so, it will probably be
necessary to start the diagnostic process with a
guess as to the nature of the difficulty.
The table below affords an opportunity to make
note of various influences discovered while
investigating the problem and organize thoughts.
It is made for you to use as you see fit.
If the solution does not become evident in the
course of completing the check list above, use
Tech Tool to investigate further.
The noise or vibration occurs: Yes No Remarks
When the vehicle is stationary
At idle Engine Speed =
When power take-off is engaged Engine Speed =
Other items of interest
When the vehicle is in motion
With a particular superstructure
At a particular weight
At a particular speed
On a particular type of road
Driving without cruise control
Driving with cruise control
Driving using the speed governor
At full load
In a particular gear
When freewheeling (clutch
disengaged)
Vehicle information
Type of chassis suspension (air?)
Type of cab suspension (air?)
Type of driver's seat (make and
model)
Other items of interest
Notes:
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