NHTSA ID Number: 10162799
Manufacturer Communication Number: OM-H757 Rev E
TSB/Document Date: 2019-07-15
Summary
Operation Name: Hendrickson Auxiliary Axle Systems Document Name: Owners Manual - Non-Steerable Auxiliary Lift Axle Systems; Operation & Preventive Maintenance Procedures Summary: This document provides operation and preventive maintenance procedures for Hendrickson non-steerable auxiliary lift axle systems.
10,000
34
35
36
39
42
46
11,000
38
39
40
43
46
51
12,000
42
43
44
47
51
56
13,000
46
47
48
51
55
61
14,000
50
51
52
56
60
66
15,000
54
55
56
60
64
71
16,000
58
59
60
64
69
76
17,000
62
63
64
68
74
81
18,000
67
68
68
73
78
86
19,000
71
71
72
77
83
90
20,000
74
75
76
81
87
95
21,000
78
79
80
85
91
100
22,000
81
83
84
89
96
104
23,000
85
87
88
94
100
109
24,000
89
91
92
98
105
114
25,000
93
95
96
102
109
119
AXLE LOAD (in pounds)
*RIDE AIR SPRING EXTENSION
(in inches)
*
ESTIMATED AIR SYSTEM PRESSURE REQUIREMENTS
(in PSI)
TOUGHLIFT FMT 25K / FMW 25K / FMB 25K
To measure ride air spring extension and axle lift, refer to Figure 6–1.
Air Pressure Load Information
14
OM–H757
Owner’s Manual — Non–Steerable Auxiliary Lift Axle Systems
SECTION 7
Torque Specifications
NON-STEERABLE AUXILIARY LIFT AXLE SYSTEMS
HENDRICKSON RECOMMENDED TORQUE SPECIFICATIONS
SIZE
TORQUE VALUE
(FOOT POUNDS)
Pivot Bolt
¾"
275–300
2.
Pivot Bolt / Shift Arm
7⁄8"
425–475
3.
Frame Attachment Bolt (Recommended)
¾"
300–325
3⁄8"
25–30
½"
25–30
½"
45–50
DESCRIPTION
1.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
Air Spring Bolt (Lower)
Air Spring Nut (Upper)
Compliant Tie Rod (CTR)
Round Tube Tie Rod
Heavy-duty (HD) Tie Rod
¾"
45–50
Attachment
7⁄8"
425–475
Adjustment
5⁄8"
180–190
Attachment
7⁄8"
125–180
Adjustment
5⁄8"
45–50
Attachment
7⁄8"
425–475
Adjustment
5⁄8"
180–190
¾"
75–125
14.
15.
Suspension Cross Member Bolt
5⁄8"
160–180
9⁄16"
90–110
Bolt-on Brake Attachments
5⁄8"
160–180
7⁄16"
40–50
5⁄8"
130–150
7⁄16"
70–90
5⁄8"
35–45
Radius Rod Bolt
7⁄8"
425–475
U–bolts
7⁄8"
450–495
16.
17.
18.
19.
20.
21.
22.
23.
Shift Chamber Attachment
Shift Chamber Yoke Attachment
NOTE: Torque values shown apply only if Hendrickson supplied fasteners are used. If non-Hendrickson fasteners are used, follow the torque
specification listed in vehicle manufacturer’s service manual
.
OM–H757
15
Torque Specifications
Owner’s Manual – Non-steerable Auxiliary Lift Axle Systems
SECTION 8
Troubleshooting Guide
NON-STEERABLE AUXILIARY LIFT AXLE SYSTEM
PROBLEM
Lift axle not getting
the desired load on
the axle
The lift axle is not
getting the correct lift
Lift axle has a vertical
hop
Lift axle has
excessive lateral
movement
Lift axle in reverse
caster when lifted
Excessive tire wear
POSSIBLE CAUSE
CORRECTION
Improper air pressure to the air springs
a. Adjust the air pressure at regulator valve to increase ride spring
pressure.
b. Verify sufficient pressure to the air control system, see Air Pressure Load
Charts in the Air Pressure Load Information Section of this publication.
Air control system not properly installed
Check plumbing of air system, refer to Publication No. OM–H817
Lift axle mounted too high or incorrect ride
height specification
a. Spec a larger diameter tire, if desired height is not achieved then,
change axle seat height
Lift axle air springs not getting proper air
pressure
a. Check system air pressure
b. Check air system plumbing, refer to Publication No. OM–H817
c. Check lift spring pressure
Interference with chassis, drive line or other
components
Inspect for interference
Lift axle not installed properly
Check installation with factory installation drawing
Insufficient load in the air system
Adjust the air pressure at regulator valve to increase ride spring pressure.
Unbalanced tires
Balance tires
Axle bolt connection loose
Re–torque to factory torque values, see Torque Specification Section of this
publication
Pivot bolt connection loose
Re–torque to factory torque values, see Torque Specification Section of this
publication
Lift axle out of alignment
Re–align lift axle
Different size tires on each side
Use same size tires
Tires are unbalanced
Balance tires
Air pressure in tires different from side to side
Equalize air pressure in tires
Incorrect air line plumbing
Correct air plumbing, refer to Hendrickson Publication No. OM–H817
Lift axle is not raised before vehicle turns
or curves greater than 90 degrees are
navigated.
TO MINIMIZE PREMATURE TIRE WEAR OR POSSIBLE DAMAGE TO LIFT AXLE
COMPONENTS, THE LIFT AXLE MAY BE RAISED TO THE UP POSITION PRIOR
TO NAVIGATING A 90 DEGREE OR TIGHTER CURVE OR TURN. COMPLY WITH
ALL FEDERAL, STATE / PROVINCIAL AND / OR LOCAL WEIGHT, DIMENSION AND
CONFIGURATION REGULATIONS UNDER LOADED AND UNLOADED CONDITIONS.
Re‑align axle. Reference Hendrickson Publication No. TP–H621
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 800.660.2829 or 800.668.5360 in Canada for additional information.
www.hendrickson-intl.com
H757 Rev E 03-19
SPECIALTY PRODUCTS AUXILIARY AXLE SYSTEMS
277 North High Street
Hebron, OH 43025 USA
800.660.2829
740.929.5600 • Fax 740.929.5601
Hendrickson Canada
250 Chrysler Drive, Unit #3
Brampton, ON Canada L6S 6B6
800.668.5360
905.789.1030 • Fax 905.789.1033
© 2019 Hendrickson USA, L.L.C. All Rights Reserved. All trademarks shown are owned by Hendrickson USA, L.L.C., or one of its 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: OM-H757 Rev E
Replacement Service Bulletin Number:
MFR Communication Date: 2019-03-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT
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