NHTSA ID Number: 10146187
Manufacturer Communication Number: 17730-301-Rev C
TSB/Document Date: 2018-10-29
Summary
Operation Name: Hendrickson
Truck Commercial Vehical Systems Document Name: Technical Procedure - ULTIMAAX Rear Suspension for Kenworth Vehicles - Service Instructions Summary: This document provides preventive maintenance, service, repair and rebuild instructions for Hendrickson ULTIMAAX rear suspension systems equipped on Kenworth vehicles.
4
17
5
7
6
18
Parts List
8
17730-301
ULTIMAAX® for Kenworth Vehicles
KEY NO. PART NO.
DESCRIPTION
VEHICLE
QTY.
KEY NO. PART NO.
DESCRIPTION
VEHICLE
QTY.
Progressive Load Spring Service Kit, One Side
Includes Key Nos. 11-13
11
*Progressive Load Spring
4
34013-196
Progressive Load Spring Fasteners Service Kit,
One Side, Includes Key Nos. 12-13
12
*M10 x 1.5 x 40 mm 6G Flange Bolt
8
13
*M10 x 1.5 Flange Lock Nut
8
14
70886-000
Saddle Assembly
4
34013-197
Saddle Only Fasteners Service Kit, One Side,
Includes Key Nos. 15-16
15
*M20 x 1.5 x 75 mm Flange Bolt
8
16
*M20 x 1.5 Flange Nut
8
17
77205-001
Saddle Cap, Replaces 77374-001
4
60961-768
Saddle Cap Fasteners Service Kit, One Side,
Includes Key Nos. 18-20
18
*M16 x 2 x 6G x 180 mm Flange Bolt
8
19
*M16 Flat Washer
8
20
*M16 x 2 x 6H Nut
8
21
60680-015L
Shock Absorber
4
22
78630-001
Upper Shock Bracket
2
Replaces 78630-002 (If equipped)
60961-818
Upper Shock Fasteners Service Kit, One Beam,
Includes Key Nos. 23-24
23
*M16 x 2 x 140 mm Flange Bolt
4
24
*M16 x 2 Flange Nut
4
25
ULTRA ROD® PLUS™ Longitudinal Torque Rod,
2
Straddle/Straddle Includes Key No. 27
92000-610S Front
92000-660S Rear
26
92350-605S
**ULTRA ROD PLUS Transverse Torque Rod
2
Straddle / Taper Includes Key Nos. 27-28
27
66649-002L
XTRB Straddle Bushing
6
28
66649-004L
XTRB Taper Bushing
2
29
49689-000L
Torque Rod Shim
As Req.
30
70867-001
P-80 Lubricant - 10 ml (Not Shown)
As Req.
1
Equalizing Beam Assembly with Shock Bracket 2
Includes Key Nos. 3-5a
78489-540 54" Beam Length
78489-560 56" Beam Length
60961-759
Cross Tube Service Kit, Includes Key No. 2
and Weldable Loose Plug (Not Shown)
2
44642-008
Cross Tube - 1140 mm
1
60961-755
Equalizing Beam Bushings Service Kit,
One Beam, Includes Key No. 3-4, 6-8, 18-20
3
69538-000L
Center Bushing
2
60961-752
End Bushing Service Kit, One Wheel End,
Includes Key Nos. 4-8
4
*Bar Pin End Bushing Assembly,
Includes Key No. 5a
5
Bar Pin Shim
8
a
50130-000 0.19" / 0.19" Standard
b
50131-000 0.25" / 0.12" Optional
c
57026-000 0.375" Optional flat shim
End Bushing Fasteners Service Kit, Includes
Key Nos. 6-8
56659-001
Tandem
56659-005
One Beam
34013-104 One Wheel End
6
*1"-8 UNC x 6" Bolt
8
7
*1" Hardened Washer
16
8
*1"-8 UNC Locknut
8
9
Frame Hanger, 34" Width, 11" Ride Height
2
70912-204 7" Axle Hanger Drop
70912-205 7¾" Axle Hanger Drop
60961-749
Shear and Progressive Load Spring Service Kit,
One Side, Includes Key Nos. 10-13,15-16,
18-20, 30
60961-750
Shear Spring Service Kit, One Side
Includes Key Nos. 10, 15-16, 18-20, 30
10
*Shear Spring
8
60961-751
NOTES: * Item included in kit/assembly only, part not sold separately.
** Transverse torque rods are mandatory for the ULTIMAAX 46K and 52K rear suspension regardless of axle spacing.
Hendrickson Lit. No. 48422-592 – ULTIMAAX Gauge Card can be used in the unloaded condition to measure (1) the length of cut / split, (2)
depth of separation and (3) the height of the progressive load spring (PLS).
17730-301
9
Parts List
ULTIMAAX® for Kenworth Vehicles
■■
60K • 70K CAPACITY
17
18
19
19
9
17
8
19
9
18
20
6
8
16
11
7
13
16
11
12
10
10
2
1
3
14
15
5
4
5
Parts List
10
17730-301
ULTIMAAX® for Kenworth Vehicles
KEY NO. PART NO.
DESCRIPTION
VEHICLE
QTY.
KEY NO. PART NO.
DESCRIPTION
1
Equalizing Beam Assembly, Includes Key
2
Nos. 3-4
78634-560 60K, 56" Beam Length
78634-600 60K, 60" Beam Length
80192-560 70K, 56" Beam Length, 6" Bushing
80291-560 70K, 56" Beam Length, 7" Bushing
80192-600 70K, 60" Beam Length, 6" Bushing
80291-600 70K, 60" Beam Length, 7" Bushing
Cross Tube Service Kit, Includes Weldable Loose
End Plug (Not Shown)
60961-759 60K, Includes Key No. 2a
60961-875 70K, Includes Key No. 2b & Circlip (Not Shown)
2
Cross Tube, 1140 mm
1
a
44642-008 60K
b
78962-001 70K
Equalizing Beam Bushings Service Kit,
One Beam
34013-290 60K, 6" Bushing, Includes Key No. 3a-5a, 15-16
34013-291 70K, 6" Bushing, Includes Key No. 3b, 4a-5a, 15-16
34013-292 70K, 7" Bushing, Includes Key No. 3b-5b, 15-16
3
Center Bushing Assembly, includes End Plug
2
a
69538-000L 60K
b
80539-001 70K, includes Circlip (Not Shown)
End Bushing and Adapter Service Kits,
• Tandem
60872-010 60K-70K, 6" Bushing, Includes Key No. 4a-5a
60872-011 70K, 7" Bushing, Includes Key No. 4b-5b
• One Wheel End
34013-052 60K-70K, 6" Bushing, Includes Key No. 4a-5a
34013-110 70K, 7" Bushing, Includes Key No. 4b-5b
4
End Bushing
4
a
10363-000L 60K-70K, 6" Bushing
b
10364-000L 70K, 7" Bushing
5
End Bushing Adapter Assembly
4
a
21140-007 60K-70K, 6" Bushing
b
21140-004L 70K, 7" Bushing
6
VEHICLE
QTY.
Frame Hanger
2
80821-003 60K, 6" Bushing
80821-002 70K, 6" Bushing
80821-001 70K, 7" Bushing
60961-876
Shear and Progressive Load Spring Service Kit,
One Side, Includes Key Nos. 7-8, 9-10, 12-13,
15-16, 21
60961-877
Shear Spring Service Kit, One Side
Includes Key Nos. 7, 12-13, 15-16, 21
*Shear Spring
8
60961-878
Progressive Load Spring Service Kit, One Side
Includes Key Nos. 8-10
*Progressive Load Spring
4
60961-812
Progressive Load Spring Fasteners Service Kit,
One Side, Includes Key Nos. 9-10
*M10 x 1.5 x 35 mm 6G Flange Bolt
8
*M10 x 1.5 Flange Locknut
8
80964-001
Saddle Assembly
4
34013-197
Saddle Only Fasteners Service Kit, One Side,
Includes Key Nos. 12-13
*M20 x 1.5 x 75 mm Flange Bolt
8
*M20 x 1.5 Flange Nut
8
80965-001
Saddle Cap
4
60961-879
Saddle Cap Fasteners Service Kit, One Side,
Includes Key Nos. 15-16
*M20 x 1.5 x 175 mm Flange Bolt
8
*M20 x 1.5 Flange Locknut
8
78561-001
Corner Bracket
4
76847-000
**V-rod Assembly
2
68754-065
M20 x 2.5 x 65 mm Flange Bolt
10
Axle Apex Bracket, see Table below
2
70867-001
P-80 Lubricant - 10 ml (Not Shown)
As Req.
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
NOTES: * Item included in kit / assembly only, part not sold separately.
** V-rods are mandatory for the ULTIMAAX 60K and 70K rear suspension regardless of axle spacing.
Hendrickson Lit. No. 48422-578 – ULTIMAAX Gauge Card can be used in unloaded condition to measure (1) the length of cut / split, (2)
depth of separation and (3) the height of the progressive load spring (PLS).
KEY NO. 20
AXLE APEX BRACKET
80784-XXX – RT70 Axle
Pinion
Angle
Front
Drive
Rear
Drive
80786-XXX – D70 Axle
Pinion
Angle
Front
Drive
80913-XXX – RT58 Axle
Rear
Drive
Pinion
Angle
Front
Drive
Rear
Drive
91005-XXX – D60 Axle
Pinion
Angle
Front
Drive
Rear
Drive
0
80784-005 80784-105
0
80786-005 80786-105
0
80913-005 80913-105
0
91005-005 91005-105
1
80784-001 80784-101
1
80786-001 80786-101
1
80913-001 80913-101
1
91005-001 91005-101
2
80784-002 80784-102
2
80786-002 80786-102
2
80913-002 80913-102
2
91005-002 91005-102
2.5
80784-025 80784-125
2.5
80786-025 80786-125
2.5
80913-025 80913-125
2.5
91005-025 91005-125
3
80784-003 80784-103
3
80786-003 80786-103
3
80913-003 80913-103
3
91005-003 91005-103
4
80784-004 80784-104
4
80786-004 80786-104
4
80913-004 80913-104
- 2026 ALL-IN-ONE HEAVY DUTY TRUCK SCANNER – BUILT FOR...
- 42+ RESET FUNCTIONS – MORE THAN A BASIC TRUCK CODE...
- ACTIVE TEST & ECU CODING – ADVANCED BIDIRECTIONAL SCAN...
- FULL-SYSTEM HDOBD/OBD2 DIAGNOSTICS – WIDE TRUCK & ENGINE...
- PROFESSIONAL HARDWARE + RELIABLE SUPPORT – BUILT FOR DAILY...
- 【Built for Heavy Duty Diesel Diagnostics】Designed for...
- 【Full System Diagnostics+All HD OBD Modes】The New HD...
- 【Wide Heavy-Duty Vehicle Coverage】Supports a wide range...
- 【Speaks Major Truck Protocol】The New HD601 diesel truck...
- 【Save Hundreds on Diagnostic Fees】Why pay $150–300 for...
Last update on 2026-06-23 / Affiliate links / Images from Amazon Product Advertising API
If the PDF is very large, it may not load in the preview below.
Some older TSBs had multiple PDFs — visit the NHTSA Website to view all PDFs.
If the TSB PDF does not show, download or view it on the NHTSA Website.
Click on the (+) Plus Sign
Then Click on Associated Document(s)
Search NHTSA Database for Recalls
Search NHTSA Database for Vehicle Investigations
View Latest Vehicle Investigations
Search NHTSA Database for Vehicle Complaints
View Latest Vehicle Complaints
TSB/Document ID: 17730-301-Rev C
Replacement Service Bulletin Number:
MFR Communication Date: 2018-08-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SUSPENSION
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
- Stay Updated with Lifetime Access: This obd2 scanner includes lifetime free software updates for all app service functions. With a single payment, enjoy full access to diagnostics, reset tools, and maintenance features — zero subscription fees. A budget-friendly choice for weekend mechanics, home car owners, and DIYers, supporting vehicles from 1996 onward. Come to us with your VIN to check compatibility.
- Full Bidirectional Control/Active Tests & Stable Wireless Connectivity: This car code reader features full bidirectional control, allowing you to send commands to the vehicle's ECU for active tests on components such as fuel pumps, injectors, A/C clutches, windows, sunroofs, and more. This car scanner diagnostic tool helps DIYers quickly diagnose and test vehicle parts, cutting down troubleshooting and repair time. With BT 4.0 wireless connectivity, you can enjoy cable-free diagnostics up to 33 feet. Stand in your garage and test windows, wipers, or even engine components—all without needing to move around your car.
- Portable Car Scanner with 26 Special Functions: Scheduled vehicle maintenance with the A30M car diagnostic scanner can keep your vehicle in peak condition and save you big on dealership trips. The XTOOL A30M obd2 scanner diagnostic tool features essential reset and relearn functions, such as Oil Reset, EPB Reset (Electronic Parking Brake Release), SAS, ABS Brake Bleeding, Throttle Body Relearn, Injector Coding, Crank Sensor Relearn, Headlight Adjustment, and Tire Size Reset. Note: Service functions may vary by vehicle model – check compatibility beforehand!
- Wide Compatibility CAN FD & FCA
Autoauth: This obd2 scanner diagnostic tool is compatible with over 85+ car brands from the U.S., Europe, and Asia, providing extensive coverage through a BT connection with your smartphone or iPad. Now upgraded to support the latest protocols, it includes FCA AutoAuth access for Chrysler, Jeep, Dodge, and Fiat (2018+), and supports CAN FD for GM (2020+) models, giving you greater access to newer vehicles and systems. Note: The FCA AutoAuth account is not included with the device. Users must register and pay separately through the official FCA AutoAuth website to access diagnostic functions for vehicles that require it. - Up to 8 Live Data Streams Graphing – Real-Time Graphing for Deeper Insight: This car scanner supports up to 8 live data streams simultaneously with intuitive, real-time graphing. Gain comprehensive insights into your vehicle’s performance, making it easier to spot issues, detect trends, and make informed diagnostic decisions with confidence.
- Comprehensive OBD2 Scanner with 16 Resets: The XTOOL D5S car code reader and vehicle reset tool provides an advanced diagnostic solution with 16 commonly needed reset functions, including Electronic Parking Brake Reset (EPB Reset), SAS, BMS Reset (Battery Test), Throttle Body Relearn, TPMS Reset, ABS Bleeding, Injector Coding, Gearbox Match, Suspension Adjustment, Headlight, Window Initialization, Crank Sensor Relearn and more. Equipped with CAN FD Protocol and FAC AutoAuth, the D5S obd2 scanner diagnostic tool ensures compatibility with a broad range of modern vehicles, allowing users to address common maintenance needs quickly. NOTE: Please Check the Compatibility before ordering.
- 4 Main System Car Scanner & Full OBD2 Diagnostics: The XTOOL D5S car code reader is ideal for home mechanics, DIYers, and professionals, providing access to Transmission/Engine/ABS/SRS systems to read DTCs, Live data can be displayed in text or up to 4 PID data graphs, along with full OBD2 diagnostics to check the engine light on, other obd2 issues and routine maintenance. This car diagnostic scanner ensures you can keep your vehicles in top condition, avoiding costly repairs or unexpected breakdowns. NOTE: Some vehicles display three systems after connection because the transmission and engine of some vehicles are integrated into one.
- Check Engine Code Reader & Real-Time Engine Monitoring: Whether you're a car owner, a DIYer, or run a repair shop, the XTOOL D5S obd2 scanner diagnostic tool makes engine diagnostics fast and frustration-free, reading and explaining trouble codes in seconds—no confusion. Check live data like fuel trim, 02 sensor voltage, RPM, and coolant temp to pinpoint mis~fires, rough idle, or sensor issues. After repairs, simply use the D5S check engine code reader and reset tool to turn off the check engine light and confirm the problem’s fixed—saving time, money, and unnecessary shop visits. - Note: If the check engine light comes back on, it indicates the original problem still exists.
- Portable Car Scanner for ABS and SRS: XTOOL D5S gives you peace of mind when ABS or airbag warning lights come on. It reads and clears ABS codes to help you fix brake sensor, traction control, or wheel speed issues, and supports ABS bleeding after repairs like caliper or master cylinder replacement. For airbag systems, it scans and clears SRS codes related to airbags, seatbelt tensioners, and crash sensors. Whether you're doing repairs at home or running a small shop, the D5S is a cost-effective solution for safety diagnostics. Note: If a fault code returns after clearing, it usually means the issue hasn’t been fully resolved. Please check the compatibility before ordering.
- Transmission Warning Light ON? Here’s the Transmission Diagnostic and Reset Tool You Need: The XTOOL D5S is more than just a basic car scanner—it’s an easy-to-use transmission diagnostic tool. From rough shifts to slipping gears, the D5S lets you read and clear transmission trouble codes, monitor real-time TCM data, and perform transmission resets after fluid changes or repairs. Whether you’re a hands-on car owner or a pro running a busy shop, this OBD2 scanner with transmission functions helps you catch problems early—saving you time, money, and future headaches.. Note: Clearing fault codes is equivalent to a reset on some vehicles, but not all. For help, contact XTOOL Tech Support.
- Save $500+/Year with Pro-Level Diagnostics -No Subscriptions: The Portable XTOOL Anyscan A30D OBD2 scanner diagnostic tool includes free lifetime software updates for all app service functions, without extra cost. With a single payment, enjoy full access to diagnostics, relearn scan tools, and maintenance features. A cost-effective, smart choice for car owners and DIY enthusiasts, compatible with vehicles from 1996 onward. Please provide the car VIN and the special functions you need in advance so that we can confirm compatibility
- Bi-Directional Control for Faster Troubleshooting: Unlike a basic code reader, the A30D bi directional scan tool sends commands directly to your vehicle’s ECU to actively test components like fuel pump, valves, wipers, windows, doors, sunroof, and headlamps right from your smartphone. See component responses in real time without disassembly—perfect for brake jobs, electrical issues, and hard-to-find problems. This bidirectional obd2 scanner helps pinpoint faults faster, reduce guesswork, and avoid replacing good parts. An efficient, easy-to-use car scanner diagnostic tool built for DIYers, home garage users, and small-shop technicians who want real two-way scanner, not just codes
- 19 Reset Functions for Routine Maintenance: The A30D car diagnostic scanner provides 19 relearn functions without extra charges, including EPB Reset for parking brake replacement, TPMS Reset after tire changes, ABS Auto Bleeding, Oil Reset, SAS Reset, BMS Reset, Throttle Relearn, Injector C0ding, Gear Learning, Crank/Crankshaft/Cam/Ckp Sensor Relearn Tool, Transmission Match, Seat Calibration, Airbag Repair and more. This XTOOL A30D automotive scanner diagnostic tool supports preventive care, helping extend vehicle life and reduce costly shop visits. Functions vary by vehicle make and year—plz confirm compatibility before purchase
- Stable BT Connection & All-System & 8 Pids Live Data: The A30D wireless OBD2 scanner delivers a fast and stable wireless connection up to 33 feet, letting you move freely around the vehicle without tangled cables. Pair with with Android 9.0+ and iOS 10.0+ devices to turn your phone into a mobile auto scanner—perfect for home garages, driveways, or on-the-spot repairs. This full system scanner for cars provides real-time access to all major modules, including Engine, Gearbox, ABS, SRS, AC and more. with clear graphs, meters, and up to 8 PIDs displayed at once. This car code reader makes system monitoring visual, simple, easy to understand, and offering data logging for playback and deeper
- Wide Compatibility with CAN-FD & FCA Support: The A30D car computer diagnostic reader works with most 1996 and newer vehicles with a standard OBD2 port, including for Ford, for GM, for Toyota, for Honda, for Nissan,for Hyundai etc, with ongoing updates covering more car models and functions later. It also supports newer communication protocols like CAN-FD and FCA AutoAuth (Personal AutoAuth account and active subscription required, not included with the device!for Chrysler, for Dodge, for Jeep, for Fiat models). It is a future-ready automotive scanner diagnostic tool for households with multiple vehicles or part-time techs. Coverage vary by cars, plz check the compatibility first
Last update on 2026-06-23 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.