1710

276

428

1760

281

429

1810

440

RPL20

450

RPL25
Figure 7 ‐ Entering the Measurements Taken on Vehicle

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• Enter the measurements you took on the vehicle and see if any adjustment is required.

Figure 8 ‐ Entering Corrective Mode to Make Adjustments

•
•
•
•

Enter Corrective Mode.
Attempt to correct the drive line angles with the least amount of changes.
Correcting by adjusting the prop shafts is less labor intensive than changing seats and plates.
If the seats and plates need to be changed to make the correction, you must use the chart below and calculate
the difference in pinion angle from the measured pinion angle.
◦ Example:
◦ 8 was measured on truck. Truck had 3548298C1 Seats installed.
◦ Truck is unloaded, 7.58 on the chart. Changing to a 3548299C1 Seat shows 9.53 unloaded.
◦ That would give you 1.95 of pinion angle change (9.53 minus 7.58).
◦ The 8 measured plus 1.95 increase is 9.95 and brings the driveline into specification.
◦ You must also check that when the vehicle is loaded, the angles will stay within specification. (Refer to
Figure 9).

0 working angles are not acceptable. Eaton DAA will not catch this error.
Figure 9 ‐ Using Corrective Mode to Check Loaded Angles (If Required)

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• Verify the angles remain in specification when loaded. (If Required)
◦ Example Continued:
◦ Front Drive Axle Seats installed: 3548297C1. Pinion angle will increase 0.75 when loaded. (4.45 minus 3.70)
◦ Rear Drive Axle Seats now installed: 3548299C1. Pinion angle will increase 0.75 when loaded (10.28 minus
9.53)
◦ Increase both pinion angles in corrective mode to see the reaction.
◦ In this example the drive line is within specification when loaded.
◦ Every seat is 0.75 difference between loaded and unloaded.

Using Allison Calc
•
•
•
•

Allison Calc will only check one single axle at a time.
For 6x4, 4x4, 6x6 or Drop Box applications you will need to run multiple analysis.
Refer to the information below which uses the 6x4 from Figure 9 as the example.
If a drive line needs to be adjusted it is easier to run the adjustments in Eaton DAA, then check using Allison Calc before making any
changes to the vehicle.
Figure 10 ‐ Open Allison Calc

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• Open Allison Calc
• Select Multiple‐Joint Driveline Analysis

Figure 11 ‐ Transmission and Axle Information

• As this checks to a single axle at a time, the axle vertical slope in this example is the
Forward Drive Axle.
• Enter all required information.
• Use 0 for Horizontal Slope.
• There are 2 prop shafts between the transmission and forward drive axle in Figure
9. This gives you 3 joints.
• Transmission Output RPM is calculated using IK2600160 ‐ Vehicle Speed Calculator
the same way it is calculated for Eaton Driveline Angle Analyzer.

Figure 12 ‐ Prop Shaft Information

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• Enter Prop Shaft angles and lengths.
• Joint Offset is 0.
• Shaft Phasing should match the phasing on the truck.

Figure 13 ‐ Overview

• This provides an overview of the information you have entered.
• Click Continue.

Figure 14 ‐ Results

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• Results of the First Section of the driveline analysis.
• This example is for a 6x4 and the process have to be completed twice.

Figure 15 ‐ Analysis of the Forward Drive Axle to Rear Drive Axle

•
•
•
•
•

Still using the drive line example from Figure 9.
The Forward Drive Axle to Rear Drive axle must be checked.
There is only 1 prop shaft. This gives you 2 joints.
The slope of the Forward Drive Axle is entered in the Transmission Vertical Slope box.
The slope of the Rear Drive Axle is entered in the Axle Vertical Slope box.

Figure 16 ‐ Prop Shaft Information (Interaxle Shaft)

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• Enter Prop Shaft angle and length. (This is the Interaxle shaft from Figure 9 in this example)
• Joint Offset is 0.
• Shaft Phasing should match the phasing on the truck.

Figure 17 ‐ Overview of the Forward Drive Axle to Rear Drive Axle

• Open Allison Calc
• Select Multiple‐Joint Driveline Analysis

Figure 18 ‐ Results of the Forward Drive Axle to Rear Drive Axle

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• Open Allison Calc
• Select Multiple‐Joint Driveline Analysis

Other Resources
• S06001 ‐ Propeller Shaft
• S06002 ‐ CF500, CF600 Driveshaft
Pinion Angle

IROS Seat Parts Information

Loaded Unloaded 1/3 Load Part Angle

Machined
Cast
Cast Pinion Angle
Part Number Part Number (As listed in parts catalog)

Plate Parts Information
6x4 & 4x2
HD Plate

4x2 MD Plate
(with Shock Mount)
Left Side

Right Side

0.60

‐0.15

0.05

‐6.00

3601570C2 3548295C1 2

3541719C3 3541725C3 3541726C3

2.26

1.51

1.71

‐4.25

3601571C2

3541720C3 3541727C3 3541728C3

2.50

1.75

1.95

‐4.00

3601572C2 3548296C1 4

3541720C3 3541727C3 3541728C3

2.75

2.00

2.20

‐3.75

3601573C2

3541720C3 3541727C3 3541728C3

3.23

2.48

2.68

‐3.25

3601574C2

3541720C3 3541727C3 3541728C3

3.47

2.72

2.92

‐3.00

3601575C2

3541721C3 3541729C3 3541730C3

4.45

3.70

3.90

‐2.00

3601576C2 3548297C1 6

3541721C3 3541729C3 3541730C3

5.42

4.67

4.87

‐1.00

3601577C2

3541721C3 3541729C3 3541730C3

7.36

6.61

6.81

1.00

3601578C2

3541722C3

8.33

7.58

7.78

2.00

3601579C2 3548298C1 10

3541722C3

9.31

8.56

8.76

3.00

3601580C2

3541722C3

9.55

8.80

9.00

3.25

3601581C2

3541723C3

10.04 9.29

9.49

3.75

3601582C2

3541723C3

10.28 9.53

9.73

4.00

3601583C2 3548299C1 12

3541723C3

10.52 9.77

9.97

4.25

3601584C2

3541723C3

11.49 10.74

10.94

5.25

3601585C2

3541724C3

12.20 11.45

11.65

6.00

3601586C2 3548300C1 14

3541724C3

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12.46 11.71

11.91

6.25

3601587C2

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3541724C3

Hendrickson HAS Seat Information
Degree Hendrickson P/N International P/N Required Plate P/N
Forward Axle Seats

2

50970‐1

H50970001

H50216000

2.5

50970‐2