NHTSA ID Number: 10198737
Manufacturer Communication Number: KC-345
TSB/Document Date: 2021-07-02
Summary
Mack
Chassis - Models GU / GR - Constant Correction To Center
7/1/2021
Article
Mack Chassis - Models GU / GR - Constant
Correction To Center
Internal Content
GU/GR, CHU, CXU, AN Constant Correction To Center
Often times perceived as riding on a cam lobe and having to correct
the steering wheel back to center or not holding a true line.
Vehicle Checks
(CHECKS MUST BE PERFORMED 1ST)
;
Tire design and pressure.
All tire pressures should be reduced to 80lbs.-90lbs. and
vehicle driven, bobtail, as a test.
Tire damage, uneven or extreme tread wear or mismatched
tires/sizes.
High tread block tires (ex. Bridgestone 426EL) may ride on
the center sip of the tire causing the truck to drive from the
‘rear’ causing a need to constantly correct with the steering
wheel.
If vehicle has a 5th wheel, is it lubed properly, does wandering only
happen with a trailer?
Basic alignment specs i.e. toe, thrust line and caster.
Turning torque at the steering wheel nut, depending on surface
area tested on, tires pressures, etc. avg. 60-75in lbs. or less.
Diagnosis can be completed by breaking the system into
smaller sections (upper vs. lower, etc.).
Looseness or binding in the following components:
Steering wheel or steering column
U-joints or slip joints in upper steering system
Steering gear (diagnose per manufacturer’s specifications i.e.
flow/pressure)
Pitman arm
Draglink ends and adjustment areas
Kingpins/bushings
Tie rod ends
Spindles
Wheel bearings
Lug nuts
Springs/spring hanger brackets
Front and rear axles and u-bolts
Steering box mounting, miss mounting may result in
distortion of gear
Live UI
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GU Alternate Cab Wall Boot
For GU vehicles produced prior to 1st week of January 2017. A
change of the upper steering column happened in November of
2014 (4mm shorter). With this change we believe an interference
may be present with the column boot on the cab wall. This may
create undue pressure on the column shaft as it comes out of the
cab wall.
Pressure from the boot may be applied to the steering column
shaft restricting it from turning freely. To check, disconnect upper
steering shaft at base of column shaft. Remove boot (there may be
a noticeable movement upward of the shaft). Reassemble steering
shaft to steering column and test drive. If problem is resolved
replace boot with 84723313 (Introduced into production 2017w01).
Test drive after boot replacement to ensure problem is resolved
before returning truck to customer.
GU / GR Without Assist Gear - Alternate Steering Gear/Shaft
Configuration
An e-service case to Reliability must be submitted with results of
previous checks prior to installation of gear and shaft.
; Live UI On non-assist gear trucks we have a steering gear from Sheppard
with a 90° miter box on top. This can be used with an Anthem 1
https://volvo-trkna-prod1.pegacloud.net/prweb/PRAuth/app/VolvoKM_/iNPUIKpeinqPJi2G0hH930k43USdE1gb*/!TABTHREAD2?pyActivity=%40basec…
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piece steering shaft.
Sheppard steering gear part # 8148-SD110PAE3.
Steering shaft 84703023 x 1.
Screw 25106380 x 2.
Nut 25098472 x 2.
Follow Impact service procedures for gear and shaft replacement.
Clearance to any component must be a minimum of 1”.
Pillow block bearing bracket may be left in place and trimmed off
or not.
Slightly stiffer steering may result. May improve as components
wear in.
Use 84734967 as the causal part in the claim.
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axle back
constant correction to center
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TSB/Document ID: KC-345
Replacement Service Bulletin Number:
MFR Communication Date: 2021-06-16
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: STEERING
MFR Component System:
MFR Component Subsystem:
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