NHTSA ID Number: 10162712
Manufacturer Communication Number: 17730-312 Rev A
TSB/Document Date: 2019-07-15
Summary
Operation Name: Hendrickson
Truck Commercial Vehicle Systems Document Name: Technical Procedure - SOFTEK Front Suspension System for Lion Bus Summary: This document provides preventive maintenance, service, repair and rebuild instructions for Hendrickson SOFTEK front axle and suspension systems equipped on Lion Bus vehicles.
17
12
18
Wheel Flange Nut
20
7⁄8"
⁄16"
5
M22
18 ± 2
24 ± 3
***
NOTE: * Quantities shown as per front suspension and axle system.
** Torque to 185 foot lbs., advance nut to next hex face to install cotter pin. DO NOT back off nut for cotter pin
installation.
*** Not supplied by Hendrickson, used for reference only. Follow the torque specification listed in the vehicle
manufacturer's service manual.
17730-312
59
Torque Specifications
SOFTEK® for Lion Bus
SECTION 11
Troubleshooting Guide
SOFTEK with STEERTEK Axle for Lion Bus
Troubleshooting Guide
CONDITION
Worn or damaged
kingpins and kingpin
bushings
Vibration or shimmy
of front axle during
operation
POSSIBLE CAUSE
CORRECTION
Dirt in system– contaminated lubricant
Polish and inspect kingpin, replace bushing and
seals, then follow specified lubrication procedures
Incorrect lubricant
Lubricate axle with specified lubricant
Axle not lubricated at scheduled
frequency
Lubricate axle at scheduled frequency
Incorrect lubrication procedures
Use correct lubrication procedures
Lubrication interval not compatible
with operating conditions
Change lubrication interval to match operating
condition
Worn or missing seals
Replace worn or missing seals
Caster out of specification
Verify ride height is within specification, then adjust
caster to specification
Wheels and / or tires out of balance
Balance or replace wheels and / or tires
Worn shock absorbers
Replace shock absorbers
Worn thrust washers and rear hanger
clamps
Replace thrust washers and rear hanger clamps
Broken engine mount
Replace engine mount
Wheel bearing adjustment
Adjust wheel bearing to the vehicle manufacturers
specifications
Tires have incorrect air pressure
Adjust tire pressure to manufacturer’s specification
Tires out of balance
Balance or replace tires
Incorrect toe setting
Adjust toe-in to manufacturer’s specification
Incorrect steering arm geometry
Excessive wear on tires
or uneven tire tread wear Worn kingpin bushings
Vehicle is hard to steer
Troubleshooting Guide
Repair steering system as necessary
Replace kingpin bushings
Excessive wheel bearing end play
Check specified wheel nut torque, replace worn or
damaged wheel bearings
Wheel bearing adjustment
Adjust wheel bearing to the vehicle manufacturers
specifications
Low pressure in the power steering
system
Repair power steering system
Steering linkage needs lubrication
Lubricate steering linkage
Steering knuckles are binding
Check vertical clearance
Incorrect steering arm geometry
Repair steering system as necessary
Caster out of specification
Verify ride height is within specification, then adjust
caster to specification
Tie rod ends hard to move
Replace tie rod ends
Worn thrust bearing
Replace thrust bearing
Steering gear box internal problem
Perform steering gear troubleshooting procedures
per steering gear manufacturing guidelines.
60
17730-312
SOFTEK® for Lion Bus
SOFTEK with STEERTEK Axle for Lion Bus
Troubleshooting Guide
CONDITION
Tie rod ends are worn
and require replacement
Bent or broken cross
tube, tie rod end ball
stud or
tie rod end
NOTE:
Damaged components
require replacement
Worn or broken steering
ball stud
Suspension has harsh or
bumpy ride
POSSIBLE CAUSE
CORRECTION
Tie rod ends need lubrication
Lubricate tie rod end. Make sure lubrication
schedule is followed.
Severe operating conditions
Increase frequency of inspection and lubrication
intervals
Damaged boot on tie rod end
Replace tie rod end
Pump / gear relief valve pressure setting
exceeds system specifications
Adjust power steering system to manufacturer’s
specified pressure
Steering gear poppets improperly set or
malfunctioning
Check for proper operation or adjust poppets to
OEM specifications
Axle stops improperly set
Set axle stops to OEM specifications
Severe duty cycle service
Increase frequency of inspection and lubrication
intervals
Drag link fasteners tightened past
specified torque
Tighten drag link fasteners to the specified torque
Lack of lubrication or incorrect lubricant
Lubricate linkage with specified lubricant
Power steering stops out of adjustment
Adjust steering stops to OEM specifications
Broken or worn leaf spring
Replace leaf spring
Front suspension overloaded
Redistribute steer axle load
Restricted steering radius Steering stops not adjusted correctly
Vehicle leans
Vehicle wanders
17730-312
Adjust steering stops to achieve correct wheel cut
Ride height incorrect
Adjust ride height to specification
Suspension is not torqued correctly at
installation
Perform spring hanger re-torque procedure. See
Torque Specification Section of this publication
Leaf spring broken
Replace leaf spring
Excessive weight bias
Contact the vehicle manufacturer or Hendrickson
Tech Services
Caster out of specifications
Verify ride height is within specification, then
adjust caster to specification
Incorrect toe setting
Adjust toe to specification
Air in the power steering system
Remove air form the power steering systems
Rear ride height out of adjustment
Adjust ride height to specification
Front ride height out of adjustment
Adjust ride height to specification
61
Troubleshooting Guide
SOFTEK® for Lion Bus
SECTION 12
Front Alignment Specifications
SOFTEK with STEERTEK Axle for Lion Bus
Front Suspension Alignment Specification
CAMBER1
DESIGN SPECIFICATION
LEFT
RANGE
MINIMUM
MAXIMUM
0.0° ± 1.0º
-1.0°
+1.0°
RIGHT
0.0° ± 1.0º
-1.0°
+1.0°
CROSS
0.0°
—
+2.0°
CAMBER NOTES:
The camber angle is not adjustable. DO NOT bend axle or otherwise try to adjust camber. If found out of specification,
notify Hendrickson Tech Services for further information.
1
CASTER1,2
DESIGN SPECIFICATION
LEFT
RANGE
MINIMUM
MAXIMUM
5.0° ± 1.0º
+4.0°
+6.0°
RIGHT
5.0° ± 1.0º
+4.0°
+6.0°
CROSS3
0.0°
—
+2.0°
CASTER NOTES:
1
Caster is determined with the vehicle at specified ride height or at rated load for mechanical suspension systems. It is
critical that the vehicle front and rear ride height is within specifications prior to performing a caster measurement or
adjustment. See Hendrickson ride height specifications and procedure.
2
In most cases actual vehicle caster is defined with the frame rails at zero slope. Refer to the vehicle manufacturer’s
specifications for correct frame rail slope. (Both the alignment surface and the vehicle’s frame rails should be level
during execution of alignment procedures). For vehicles with a positive frame rake (higher in rear) add the frame slope
(in degrees) to the caster reading to determine true vehicle caster.
3
T he cross caster angle is not adjustable – DO NOT bend axle or otherwise try to adjust cross caster. If found out of
specifications notify Hendrickson Tech Services for further information. Changes to caster can be attained by using
caster shims as p rovided by the vehicle manufacturer or chassis and body manufacturer. Caster shims must match, side
to side, to reduce uneven loading to the suspension components. The use of two (2) different angle caster shims will
not correct cross caster.
4
E xample of caster adjustment: 2.50º Right Hand / 3.00º Left Hand, would require two (2), 1.0 shim on each side to
increase caster and achieve 4.50° Right Hand / 5.00° Left Hand, which is in specification. DO NOT attempt to use
uneven shims.
Hendrickson recommends following tmc2 practices:
RANGE
DESIGN SPECIFICATION¹
TOTAL TOE
2
⁄16" ± ⁄32" (0.06" ± 0.03")
1
1
MINIMUM
MAXIMUM
⁄32" (0.03")
3
1
⁄32" (0.09")
TOE-IN NOTES:
1
T oe-in is to be set and adjusted in the normal vehicle unladed configuration. Actual vehicle curb weight on the ground.Toe
should be checked at the tires front and rear tread center, at a distance above ground equal to the tire’s rolling radius.
In most instances total toe is set by the vehicle manufacturer or body builder. Consult the vehicle manufacturer for
specifications.
2
Front Alignment Specifications
62
17730-312
SOFTEK® for Lion Bus
SECTION 13
Reference Material
This technical publication covers Hendrickson Truck Suspension’s recommended procedures for
our parts / products. Other components play a major role in overall performance and Hendrickson
recommends you follow the specific vehicle manufacturer’s recommendation for care and maintenance. Some recommended procedures have been developed by The Technology & Maintenance
Council (TMC) and Hendrickson supports these recommendations. We have compiled a list of
these below.
TMC
To obtain copies of the following RP’s, videos, or charts, contact TMC at:
TMC / ATA
2200 Mill Road
Alexandria, VA 22314
Phone: 703-838-1763
website: tmc.truckline.com
online ordering: www.truckline.com/store
Important References
TMC RP 214B
Tire / Wheel End Balance and Runout
TMC RP 216
Radial Tire Conditions Analysis Guide
TMC RP 219A
Radial Tire Wear Conditions and Causes
TMC RP 222A
User’s Guide To Wheels and Rims
TMC RP 230
Tire Test Procedures for Tread wear, Serviceability, and
Fuel Economy
TMC RP 514
Pre-Alignment Inspection
TMC RP 618
Wheel Bearing Adjustment Procedure
TMC RP 620B
Front End Alignment Steering Geometry
TMC RP 708A
Trailer Axle Alignment
TMC RP 642
Guidelines For Total Vehicle Alignment
TMC RP 644
Wheel End Conditions Analysis Guide
TMC RP 645
Tie Rod End Inspection and Maintenance Procedure
Videos
TMC T0326
Wheel End Maintenance
TMC T0372
Tire Pre-Trip Inspection Guidelines
Other
TMC T0400
17730-312
Wheel bearing Adjustment Procedure Wall Chart
63
Reference Material
Actual product performance may vary depending upon vehicle configuration, operation, service and other factors.
All applications must comply with applicable Hendrickson specifications and must be approved by the respective vehicle manufacturer with the vehicle in its original, as-built configuration.
Contact Hendrickson for additional details regarding specifications, applications, capacities, and operation, service and maintenance instructions.
Call your truck dealer or Hendrickson at 1.866.755.5968 (toll-free) or 1.630.910.2800 for additional information.
www.hendrickson-intl.com
17730-312 Rev A 03-19
TRUCK COMMERCIAL VEHICLE SYSTEMS
800 South Frontage Road
Woodridge, IL 60517-4904 USA
1.866.755.5968 (Toll-free U.S. and Canada)
1.630.910.2800 (Outside U.S. and Canada)
Fax 1.630.910.2899
© 2019 Hendrickson USA, L.L.C. All Rights Reserved. All trademarks shown are owned by Hendrickson USA, L.L.C., or one of the affiliates, in one or more countries.
Information contained in this literature was accurate at the time of publication. Product changes may have been made after the copyright date that are not reflected.
Printed in United States of America
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TSB/Document ID: 17730-312 Rev A
Replacement Service Bulletin Number:
MFR Communication Date: 2019-03-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRONIC STABILITY CONTROL:AUTOMATIC (ASC)
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