diagnostic guide for steer axles

mm1.book Page 85 Wednesday, June 11, 2008 11:18 AM
6 Front Non-Drive Steer Axles
Lubricant
Table AT: Front Non-Drive Axle Greasing Specifications
Grease*
Meritor Specification
NLGI Grade
Grease Classification
Outside Temperature
Multi-Purpose Grease*
O-617-A
1
6% Lithium 12-Hydroxyl
Stearate
O-617-B
2
8% Lithium 12-Hydroxyl
Stearate
Refer to the grease
manufacturer’s
specifications for the
temperature service
limits.
* Meritor recognizes that industry trends are moving toward increased selection and usage of synthetic grease in vehicle maintenance.
However, some seals are known to expand when in contact with synthetic grease. Consult your local Meritor representative for synthetic
grease application references BEFORE using any synthetic grease when performing axle service and maintenance.
Troubleshooting
6
Table AU: Front Non-Drive Steer Axle Diagnostic Table
Condition
Cause
Correction
Tires wear out quickly or
have uneven tire tread
wear.
Tires have incorrect air pressure
Place the specified air pressure in the tires.
Tires out-of-balance
Balance or replace the tires.
Incorrect tandem axle alignment
Align the tandem axles.
Incorrect toe-in setting
Adjust the toe-in specified setting.
Incorrect steering arm geometry
Service the steering system as necessary.
Excessive wheel-end play exists
Readjust the wheel bearings.
Power steering system pressure low
Repair the power steering system.
Steering gear linkage not assembled
correctly
Assemble the steering gear correctly.
Steering linkage needs lubrication
Lubricate the steering linkage.
King pins binding
Replace the king pins.
Incorrect steering arm geometry
Service the steering system as necessary.
Caster out-of-adjustment
Adjust the caster as necessary.
Tie rod ends hard to move
Replace the tie rod ends.
Worn thrust bearing
Replace the thrust bearing.
Tie rod ends require lubrication
Lubricate the cross tube ends. Verify that the lubrication
schedule is followed.
Severe operating conditions
Increase the frequency of inspection and lubrication
intervals.
Damaged boot on tie rod end
Replace the boot.
Vehicle is hard to steer.
Tie rod ends are worn and
require replacement.
ArvinMeritor Maintenance Manual 1 (Revised 06-08)
85
mm1.book Page 86 Wednesday, June 11, 2008 11:18 AM
6 Front Non-Drive Steer Axles
Table AU: Front Non-Drive Steer Axle Diagnostic Table
Condition
Cause
Correction
Bent or broken cross tube,
tie rod end ball stud,
steering arm or tie rod
end. Component requires
replacement.
Too much pressure in the power steering
system, pressure exceeds OEM specification
Adjust the power steering system to the specified
pressure.
Power steering system cut-off pressure,
out-of-adjustment
Adjust the power steering system to the specified
pressure.
Vehicle operated under severe conditions
Verify that the vehicle is operated correctly.
Add-on type of power steering system not
installed correctly
Correctly install the add-on power steering system.
Steering gear overtravel poppets incorrectly
set or malfunctioning
Check for correct operation or adjust the overtravel of
the poppets to the manufacturer’s specifications.
Axle stops incorrectly set
Set the axle stops to the manufacturer’s specification.
Drag link fasteners tightened higher than
vehicle manufacturer’s specifications
Tighten the drag link fasteners to the vehicle
manufacturer’s specified torque.
Lack of lubrication or incorrect lubricant
Lubricate the linkage with the specified lubricant.
Power steering stops out-of-adjustment
Adjust the stops to the specified dimension.
Worn or missing seals and gaskets
Replace the seals and gaskets.
Incorrect lubricant
Lubricate the axle with the specified lubricant.
Axle not lubricated at scheduled frequency
Lubricate the axle at the scheduled intervals.
Incorrect lubrication procedures
Use the correct lubrication procedures.
Lubrication schedule does not match
operating conditions
Change the lubrication schedule to match the operating
conditions.
Caster out-of-adjustment
Adjust the caster.
Wheels or tires out-of-balance
Balance or replace the wheels or tires.
Worn shock absorbers
Replace the shock absorbers.
Worn or broken steering
ball stud
Worn king pins and king
pin bushings
Vibration or shimmy of
front axle during
operation
86
ArvinMeritor Maintenance Manual 1 (Revised 06-08)
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