IK1600261 Service Bulletin/Repair Instructions

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Countries: 1K1600261
Knowledge Base System: CAB/ SLEEPER / HOOD Created: 5/25/2021

Current : Last

Language: English Modified: 8/23/2022

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Title: cab components that reduce wheel end vibration complaints
Applies To:LT sleeper & LT daycab, RH and LoneStar daycab
CHANGE LOG
Please refer to the change log text box below for recent changes to this article:
109/23/2015 - Initial Article Release
DESCRIPTION
This document explains new cab components that can reduce the intensity of vibrations felt in the cab caused by out-of-round

tires or imbalanced tires on the LT daycab and LT 73" sleeper chassis.
RH and LoneStar daycab only.
Note- does NOT apply to short 56" sleepers
Note- LT & RH daycabs built after 5/17/22 were built with these parts. Long sleepers built after 8/19/22 were built with these

parts.
SYMPTOM(s)
An 8-11 Hz vibration that occurs above 55 mph can often be felt in the driver's foot and sometimes shakes the hood mirrors.
Ensure all tires are balanced, have .040" or less radial runout, and that the "high spots" on the duals are offset 180 degrees.

Install the following cab suspension components if the vibration is still present at highway speeds.
SERVICE PARTS INFORMATION
Part Description (daycab) Part Number Quantity |Notes

Required

bushing

Daycab front cab bushing 4232177C3 2 rete onis

critical

Daycab lateral rod with isolator 4232176C1 1

Daycab- add a washer to fill space M12 hardened 2 use one on

caused by thinner lateral rod washer 30328R1 leach end

Quantity Notes

Part Description (73" long sleeper) | Part Number | Required

Long Sleeper bracket (lower) for 2523120C1 or 4 whichever is

additional rod 4037129C2 and available

4037130C1 (both)

use

Long Sleeper bracket (upper) for 2523123C1 or . .

additional rod 4361766C2 and ‘||! whichever is

4307126C2 (both)

Long Sleeper rod "A-rod" 4061319C3 1

Long Sleeper cab bushing (different

damping than as built) 4232178C2 2

Flange head bolt M12 X 1.75 1823143C1 2

Flange head bolt M12 X 1.75 X 40 30746R2 4

M12 X 1.75 nut 30755R1 8

M16 X 2 X 90 nut 30756R1 2

Flange head bolt M16 X 2 X 90 40203R1 2

Flange head bolt M12 X 90mm 40308R1 1

REPAIR STEP(s)

Daycab installation instructions here

Sleeper installation instructions here

WARRANTY INFORMATION
Warranty Claim Coding:
Refer to the Warranty Coding Manual for Group and Noun Codes.
Standard Repair Time(s):

Refer to the SRT Manual for Repair Times
OTHER RESOURCES
Master Service Information Site
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Copyright © 2022 Navistar, Inc.

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