Drag link fasteners lightened 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

Air spring not inflated

Check air supply to air spring, repair as necessary

Air spring ride height out of specification

Adjust ride height to specification per the vehicle
manufacturer’s instructions

Broken or worn leaf spring

Replace leaf spring

Front suspension overloaded

Redistribute steer axle load

Steering stops not adjusted correctly

Adjust steering stops to achieve correct
wheel cut

Ride height incorrect

Adjust ride height to specification per the vehicle
manufacturer’s instructions

Air spring(s) are not inflated

Repair source of air pressure loss

Suspension is not torqued correctly at
installation

Perform spring eye re-torque procedure, see Alignment
& Adjustments 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

Set ride height to specification per the vehicle
manufacturer’s instructions then adjust caster to
specification

Incorrect toe setting

Adjust toe to specification

Fifth wheel not greased

Grease fifth wheel

Air in the power steering system

Remove air form the power steering systems

Rear ride height out of adjustment

Adjust ride height to specification per the vehicle
manufacturer’s instructions

Front ride height out of adjustment

Adjust ride height to specification per the vehicle
manufacturer’s instructions

59

Troubleshooting Guide

AIRTEK® for Tiffin Motorhome Chassis
SECTION 12

Torque Specifications

HENDRICKSON RECOMMENDED TORQUE VALUES
PROVIDED IN FOOT POUNDS AND IN NEWTON METERS

Snap Fit

2.
400 ± 20 ft. lbs.
(543 ± 27 Nm)

3.
400 ± 20 ft. lbs.
(543 ± 27 Nm)
5.
130 ± 5 ft. lbs.
(177 ± 6 Nm)
4.
400 ± 20 ft. lbs.
(543 ± 27 Nm)
8.
Min. of 15 ft. lbs.
(Min. of 20 Nm)
6.
130 ± 5 ft. lbs.
(177 ± 6 Nm)

9.
60 ± 10 ft. lbs.
(81 ± 14 Nm)

7.
295 ± 10 ft. lbs.
(400 ± 13 Nm)

10.
188 ± 12 ft. lbs.
(255 ± 16 Nm)
11.
50 ± 10 ft. lbs.
(68 ± 14 Nm)
9.
60 ± 10 ft. lbs.
(81 ± 14 Nm)

Torque Specifications

12.
*185 ft. lbs.
(*251 Nm)

13.
68 ± 7 ft. lbs.
(92 ± 9 Nm)

60

17730-319

AIRTEK® for Tiffin Motorhome Chassis

AIRTEK with STEERTEK NXT Axle for Tiffin Motorhome Chassis
HENDRICKSON RECOMMENDED TORQUE SPECIFICATIONS
NO.

COMPONENT

FASTENERS
QTY.

SIZE

TORQUE VALUE
Foot Pounds

Nm

1

Upper Air Spring

2

Self Locking

Snap Fit

2

Front Frame Hanger to Front Leaf Spring Eye

2

¾"

400 ± 20

543 ± 27

3

Rear Shackle Bracket to Shackle Plate

2

¾"

400 ± 20

543 ± 27

4

Rear Shackle Bracket to Spring Eye

2

¾"

400 ± 20

543 ± 27

5

Upper Shock Absorber

2

¾"

130 ± 5

177 ± 6

6

Lower Shock Absorber

2

¾"

130 ± 5

177 ± 6

E NSURE CLAMP GROUP IS ALIGNED PROPERLY PRIOR TO TIGHTENING HARDWARE. FAILURE TO DO SO CAN
CAUSE LOSS OF VEHICLE CONTROL, PROPERTY DAMAGE OR PERSONAL INJURY.
7

Clamp Group

8

8

Grease Zerk

2

9

Grease Cap Assembly, Upper and Lower

4

10

Knuckle Attachment Bolt (Socket Head Cap Screw)

4

11

Knuckle / Axle Wheel Stop Bolt

2

12

Tie Rod Ends to Lower Steering Knuckle

2

13

Tie Rod Tube to Tie Rod Ends

2

¾"

295 ± 10

400 ± 13

Minimum of 15

Minimum of 20

½"

60 ± 10

81 ± 14

58

/"

188 ± 12

255 ± 16

½" Jam Nut

50 ± 10

68 ± 14

/ " Castle Nut

*185

*251

/"

68 ± 7

92 ± 9

78

58

• All hardware ¼" and greater is Grade 8 with no additional lubrication.
Frame mount hardware in most cases are Huck style fasteners supplied by the OEM.
NOTE: Torque values shown apply only if Hendrickson supplied fasteners are used. If non Hendrickson fasteners are used, follow
torque specifications listed in the vehicle manufacturer’s service manual. Hendrickson is not responsible for maintaining vehicle
manufacturer’s torque values.
* Torque to 185 foot pounds (250 Nm), advance nut to next hex face to install cotter pin. Do not back off nut for cotter pin
installation.

17730-319

61

Component Replacement

AIRTEK® for Tiffin Motorhome Chassis
AIR DISC BRAKE ASSEMBLY
HENDRICKSON RECOMMENDED TORQUE VALUES
PROVIDED IN FOOT POUNDS AND IN NEWTON METERS
1.
330 ± 45 ft. lbs.
448 ± 61 Nm)

2.
340 ± 20 ft. lbs.
460 ± 27 Nm)

3.
18 ± 2 ft. lbs.
24 ± 3 Nm)

AIRTEK with STEERTEK NXT Axle for Tiffin Motorhome Chassis
HENDRICKSON RECOMMENDED TORQUE SPECIFICATIONS
NO.

COMPONENT

FASTENERS

TORQUE VALUE

QTY.

SIZE

Foot Pounds

Nm

1

Torque Plate Mounting Fasteners

2

¾"

330 ± 45

448 ± 61

2

Caliper Assembly

12

M20

340 ± 20

460 ± 27

12

5⁄16"

18 ± 2

24 ± 3

3

Hub Cap Fasteners

NOTE: Torque values shown apply only if Hendrickson supplied fasteners are used. If non Hendrickson fasteners are used, follow
torque specifications listed in the vehicle manufacturer’s service manual. Hendrickson is not responsible for maintaining vehicle
manufacturer’s torque values.

Torque Specifications

62

17730-319

AIRTEK® for Tiffin Motorhome Chassis
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 RPs, 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

17730-319

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 Hendrickson at 1.866.755.5968 (toll-free) or 1.630.910.2800 for additional information.

www.hendrickson-intl.com
17730-319 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.

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