LI4110N068968

15MPH Noise on propeller shaft/rear axle
Topic number
LI41.10-N-068968
Version
5
Function group
41.10 - Propeller shaft
Date
10/4/21
Validity
Model 907
Reason for change
Title and remedy changed
Complaint
Noise on propeller shaft or rear axle from approx. 15 mph (vibrations, humming, droning, howling, running noise of
axle drive).
Cause
Under analysis
Remedy
In event of corresponding customer complaint, please create a TIPS case and include the following data:
- Is it a humming or a howling noise?
- Do vibrations occur at the same time?
- Does it occur at a specific engine speed, regardless of which gear is engaged?
- Is it louder in one gear than in another?
- When exactly does the problem occur?
- At what road speed?
- In which gear?
- At what engine speed?
- In which load condition?
- When carrying what sort of load?
- In what vehicle operating conditions (warm or cold)?
- Which tires and what size of tires are installed at present (attach pictures to the case)
- What type of leaf spring is installed: 1-leaf / 2-leaf / 3-leaf (attach picture of leaf spring, ensuring part number is legible).
- Pictures of the vehicle (inside, outside and underfloor, incl. suspension)
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If possible, attach picture of propeller shaft with adhesive label including legible part number. (See Picture 01)
•
Always make a film recording with video and audio when humming, droning, howling or whistling noise is involved.
Proceed as follows:
1.
2.
3.
4.
Driving at constant speed with noise
Accelerate through the noise and call out "Now" when in the loudest gear
Accelerate through the noise and call out "Now" when in the next nearest gear
Information about load: No / yes (how many lb/kg)
When doing so, make sure that there is no background noise.
•
1.
2.
Where vibrations are involved that can be picked up the hands, feet or posterior, proceed as follows:
Measure the vibrations using XENTRY Scope with rpm sensing and an accurate speed indication and record it
Information about load: No / yes (how many lb/kg)
As an alternative to the XENTRY Scope recording, you can also use the XENTRY NVH Diagnosis app.
Information about the Xentry Scope vibration measurement or the XENTRY NVH Diagnosis app is available in https://
xentry.daimler.com.
For vehicles with a rear axle "howling" problem between 70 and 90 Km/h or 45 – 55 mph, refer to LI35.00-N-073703
Attachments
File
Description
01.jpg
Propeller shaft
Symptoms
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Power transmission > Noises > Throbbing/intermittent humming
Power transmission > Noises > Humming/droning
Power transmission > Drive shaft > Propeller shaft > Noises > Humming/droning
Chassis/suspension > Noises > Humming/droning/throbbing
Operation numbers/damage codes
Op. no.
Operation text
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Time
MALLIKC
Damage
code
Note
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