Article 3245 - Reducing Steering Effort on "Steerease"

TSB #157 - January 22, 1971
(L-LT-LTS-LN-800-900 and 8000-9000 Series Trucks with a 12,000-Lb. Capacity "Steerease" Front Axle)


Steering effort can be reduced by revising the caster on subject vehicles.

The revised caster specification is:
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PROCEDURE
1. Check and, if necessary, eliminate any bind or excessive looseness in the steering linkage, front axle spindle pins, front spring pins and the steering gear.
2. Check and, if necessary, inflate the front tires to the normal operating pressure, adjust the front wheel and adjust the right and left wheel turn angle to 34 degrees.
3. Check and record the front wheel alignment with the vehicle empty. Specifications, including the revised caster, are:
MinimumMaximum
Camber+ 1/4 Degrees+ 1 Degree
Caster+ 3-1/4 Degrees+ 4-1/4 Degrees
Toe5/16 Inch In7/16 Inch In

NOTE: THE CASTER SPECIFICATION SHOWN IS WITH THE FRAME LEVEL FROM FRONT TO REAR. MEASURE FRONT TO REAR FRAME ANGLE WHEN CHECKING ALIGNMENT AND COMPENSATE AS FOLLOWS. IF THE FRONT OF THE FRAME IS LOWER THAN THE REAR, THE ACTUAL CASTER ANGLE IS OBTAINED BY ADDING THE FRAME ANGLE TO THE CASTER ANGLE SHOWN ON THE CHECKING EQUIPMENT. IF THE FRONT OF THE FRAME IS HIGHER THAN THE REAR, SUBTRACT THE FRAME ANGLE FROM THE CASTER ANGLE SHOWN ON THE CHECKING EQUIPMENT.

4. Correct toe, if necessary.
5. Install the necessary wedge or wedges to obtain the caster specified in Step No. 3, see Figures 3 and 4 .

INSTRUCTIONS
    • Locally purchase and use only wedges as shown on Figure 4 .
    • Install all wedges with the thick end forward.
    • Do not use more wedges than the quantity specified on Figure 4 or install them in any other way except as shown on this figure. Failure to follow these instructions could result in a steering linkage error or insufficient engagement of the spring center bolt or spacer dowel pin.
    • Use a new service spring center bolt (7/16"-20 x 6"), Part Number 355700-S, and a new nut, Part Number 34671-S, when a 2-degree wedge is required. Cut the center bolt approximately 1/8 inch above the nut and then peen it to prevent nut loosening.
    • Install the 2-degree wedge with the 21/32 inch diameter countersunk hole against the center bolt head (facing down).
    • Torques (with clean oiled threads):
      • Spring U-bolt nuts - 300 footpounds with the weight of the vehicle on the springs.
      • Spring center bolt nut — 50 footpounds.

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Figure 3
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Figure 4


WARRANTY STATUS: Reimbursable within the provisions of the Warranty & Policy Manual.
Operation: 3001-A, 3001-A-l, 3001-A-4 Time: As applies to the operation used.

DLR. CODING: Basic Part No. 3010 - Code 36

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