SEPD166000

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Service Magazine
2013/09/04
Media Number -SEPD1660-00
Publication Date -04/09/2013
Date Updated -04/09/2013
i05432311
Rear Axle Alignment Specifications {7000}
SMCS - 7000
On Highway Truck:
CT660 (S/N: TGA1-UP; TGD1-UP; TJD1-UP; TEJ1-UP; TRK1-UP; TKL1-UP; TEM1-UP;
TEP1-UP; TGR1-UP; TGS1-UP; TJS1-UP; TGT1-UP; TGW1-UP; TSW1-UP; TEY1-UP;
TSY1-UP; TEZ1-UP; TGZ1-UP)
The following tables display rear axle alignment specifications and target values.
Use the target values when readjusting the rear axle alignment.
Note: Before measuring rear axle alignment, the rear suspension (if equipped) ride height must be
within specification.
Table 1
Rear Axle Thrust
Target
Specification
Min
Max
Target
Min
Unit
Max
-0.18
+0.18
-0.05
+0.05
Degrees
-6.4
+6.4
-2.13
+2.13
Millimeters
-3.1
+3.1
-0.9
+0.9
mm/M
-0.25
+0.25
-0.084
+0.084
Inches
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Advanced Full Text Search - SEPD1660 - 2013/09/04
-0.75 inch
+0.75 inch
-0.2 inch
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+0.2 inch
Laser to target at 240 inches
Table 2
Rear Axle Tram/Scrub/Parelllism
Tram/Scrub/Parelllism
Specification
Target
Unit
Min
Max
Min
Max
-0.08
+0.08
-0.08
0
Degrees
-3.2
+3.2
-3.2
0
Millimeters
-1.4
+1.4
-1.4
0
mm/M
-0.125
+0.125
-0.125
0
Inches
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Illustration 1
Laser Gun-to-Target Distance at 0.18 degree thrust angle
Example: 19 mm (0.75 inch) off the center line of the target with the gun-to-laser distance of 610 cm
(240 inch), is within thrust specification.
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Thrust Angle
The thrust angle is formed by the centerline of the vehicle frame and the direction the axle points,
viewed from the rear of the vehicle. Positive thrust angle is the axle pointing to the right of the
centerline of the vehicle frame rails. Negative thrust is the axle pointing to the left of the centerline of
the vehicle frame rails.
Note: On "Jasam" alignment equipment, the positive and negative thrust angle is reversed. On
"Josam" equipment, Positive thrust is axle pointing towards the left of the centerline of the vehicle
frame.
Illustration 2
g03428882
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Rear Axle Thrust (Positive thrust shown)
(D) 90 degree angle
Illustration 2 shows an example of Positive Thrust.
(A) - (B) = Rear axle thrust measured in millimeters (inches).
(C) = Rear axle thrust from centerline of frame rails in degrees, or millimeters/Meter (mm/M).
Tram
Tram is the difference in the tandem axle spacing from one side of the vehicle to the other. Tram
could also be called the angle formed by the thrust angles of the tandem axles. Tram is also called
scrub or parallelism. Negative tram is when the tandem axles are closer together on the left side than
the right side, viewed from the rear of the vehicle. Tram is the most important factor in rear vehicle
alignment.
Note: On "Jasam" alignment equipment, the positive and negative tram angle is reversed. On "Josam"
equipment, Positive tram is when the axles are closer together on the left side of the vehicle.
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Illustration 3
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g03428883
Tram measurement (Negative tram shown)
Illustration 3 shows an example of Negative Tram.
(A) - (B) = Tram measurement in millimeters (inches).
(C) = Tram in degrees, or millimeters/Meter (mm/M).
Copyright 1993 - 2013 Caterpillar Inc.
Wed Oct 2 17:48:38 CDT 2013
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