Spicer Vibration Diagnostics User Manual
Start
Vibration Diagnostics
1
2
3
Gather Info
When did vibration start?
Where is vibration felt?
What road conditions?
Under load or high torque
conditions?
During acceleration/deceleration?
Speed dependent?
RPM dependent?
Noise?
Suspension modified
Lube clean and at proper level?
recently?
Road Test
Have vehicle driver recreate
complaint condition, if
possible
Leave trailer attached
Run up to suspected RPM and
put transmission in neutral
Simulate Conditions
Speed
RPM
Gear Position
Coast
Under power
Loaded / Unloaded
6
Vibrations
Yes
While
Stationary
No
If clutch work recently done,
problem could be related to
the clutch. Verify proper
clutch was installed.
Speed
Related?
Yes Yes
No
Does ride
height meet
OEM specs
No
Correct per OEM
procedures.
Previous
work on clutch or
engine
Yes
If engine work recently done,
problem could be related to
the engine. Contact your
engine distributor.
Perform visual inspection
and use Eaton Driveline
Angle Analyzer (DAA).
Look for loose:
U-joint bearing cups and
trunnions
Bearing straps
Flange yoke / companion flange
Yoke-mounted damper
Parking brake
Center bearing
Fasteners
Driveshaft for damage / missing
weights
Driveshaft slip spline
(wear / bottoming /
inadequate engagement)
Cab mounts / air ride system
No
Problem
Solved
Yes
Done!
No
In the road test
in Step 2, the
vehicle was run
up to the
suspected RPM
and the
transmission
shift lever was
placed in
neutral.
Remove all
drive axle shafts
and lock in
power divider.
Run truck in
same condition
as when
complaint
occurred.
Did the vibration
occur during this
test?
No
Problem is related
to the clutch.
Remove clutch and
check for: Broken
springs, disc, or
other damage.
Problem
Solved
Yes
Problem is related to
the wheel end. Take
known good wheel
assembly and test
replacement from
wheel to wheel to
isolate problem.
Yes
Isolate Suspect
No
Starting with
rear-most vehicle
driveshaft, remove
each section and
re-run test to
isolate suspect
shaft.
Check:
Driveshaft runout
Re-index driveshaft Separate shaft at end
yoke, rotate 180
and reassemble.
Shaft
Contact your
engine distributor.
Was
suspect shaft
isolated?
No
If problem persists,
contact Roadranger
Support Team:
1-800-826-4357.
o
,
Yes
Problem is
related to
driveshaft.
Replace
driveshaft.
If Dana product,
return failed
component to
Dana Driveshaft.
4
5
Record Findings
Speed
RPM
Gear position
Coast
Under power
Loaded / Unloaded
Stationary Inspection
Tires
Rims
Dented driveshaft tubing
Engine supports
Transmission supports
Driveshaft center bearing
Important: Use factory service manuals and procedures and refer to all applicable safety precautions when servicing vehicles
It does not guarantee an immediate solution nor does it guarantee warranty responsibility or reimbursement. Refer to dana.com for Product Warranty Statements, Warranty Manual, and Warranty Guidelines.
Problem
Occur with
Trailer
Loaded?
No
1-800-826-4357
Yes Yes
Does ride
height meet
OEM specs
No
Correct per OEM
procedures.
Perform visual inspection
and use Eaton Driveline
Angle Analyzer
Look for loose:
Torque arms
Driveshaft slip spline (wear/
bottoming/ inadequate
engagement)
U-joint
Bearing straps
Flange yoke/ companion
flange
Center bearing
Fasteners
Cab mounts/ air ride system
This document is intended to assist with drivetrain vibration diagnosis.
(DAA).
Problem
Solved
Yes
Done!
No
Remove inter-axle
shaft and lock power
divider.
Run truck in same
condition as when
complaint occurred.
Problem
Solved
Yes
Problem is related to
the inter-axle shaft.
Contact Roadranger
Support Team:
1-800-826-4357.
No
Dana Commercial Vehicle Products Group - 3939 Technology Drive - Maumee, Ohio, USA 43537
Check for other
possible causes
Check:
Clutch
Center bearing
Transmission rear
supports
Engine mounts
Problem
Solved
Yes
Done!
No
Printed in USA RRMT-0001 01/08
If problem
persists,
contact
Roadranger
Support Team:
1-800-826-435
7.
www.dana.com
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