K32830643

5/28/2020
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Solution K32830643
Thursday, May 28, 2020 1:49:30 PM CEST
** SOLUTION **
Title
Frame Or Cab Lean - Gen II Chassis
Mack Models
Mack Model
LR , TE - TerraPro , AN - Anthem , GR - Granite , GU - Granite , PI - Pinnacle
Volvo Models
Volvo Model
VNL , VNR , VNX , VAH , VHD
** SOLUTION **
Cause
Frame lean can be caused by several seemingly isolated possibilities. The two most common are
suspension and frame assembly issues.
Solution
Suspension causes must be ruled out first. There must be a sound base to find any other cause or
you will be "chasing ghosts". Determine all suspension parts are correct for the truck and axles,
especially the axle seats. Pairs of parts, i.e. springs, etc... are the same, side to side. on the same
axle, i.e. front drive/rear drive.
Some reports are showing the cause has been frame lean or "ladder torqueing" of frame structures
during assembly. Investigation is ongoing and gathering of good information is imperative.
Care must be taken when measuring of frame heights against shop floors due to possible floor
irregularities.
Minimum measurement locations
Location
1.
2.
3.
4.
Measurement
Front of
Frame
Rear of
Frame
Back of
Cab
Front of
Tandems
Rear of
5.
Tandems
or Rear
of Frame
Best Practice For Frame Measurements
Use a 4 ft level
across the upper
frame flanges and
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measure from the
underside to the
floor.
This eliminates
issues in the
flange bends.
Checking shop floor for level when measuring frame for level
Use the 4 ft level
on the shop floor
directly under the
frame where you
will be taking
each
measurement.
Measuring frame height where a 4 ft level will not work.
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Use a smaller
level or a torpedo
level where the
longer level will
not work, i.e.
engine
compartment,
front of frame.
Again , check the
shop floor at each
measurement
location.
Floor out of level at measurement location
Where the shop
floor is NOT level,
shim the 4 ft level
and then subtract
the difference
from the
measurement at
that location
specifically
Solution visibility
Dealer distribution
Function Group
Function Group
71 frame
Administration
Author
A241298
Dealer ID
A241298
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Last modified by
A241298
Creation date
07-04-2020 21:04
Date of last update
13-05-2020 20:05
Status
Published
UNCONTROLLED COPY. Printed document is for temporary use only and should not be retained.
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