NHTSA ID Number: 10151439
Manufacturer Communication Number: SP-301 Rev-B
TSB/Document Date: 2018-12-10
Summary
Operation Name: Hendrickson
Truck Commercial Vehicle Systems Document Name: Parts List - ULTIMAAX Rear Suspension for Kenworth Vehicles Summary: This document provides parts lists for Hendrickson ULTIMAAX rear suspension systems equipped on applcable Kenworth vehicles.
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)
- 🔥🔥🔥2026 New Functions Making X7HD the Top Dog - Big...
- 🚛OEM DPF Forced Regen & Cylinder Cutout Test & more...
- 🚛Advanced ECU Coding & Programming - ANCEL X7HD 10.1inch...
- 🚛42+ Reset Functions & Bidirectional Control...
- 🚛10 Inch All Systems Diesel Scanner & Full HDOBD/OBD...
This product presentation was made with AAWP plugin.
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: SP-301 Rev-B
Replacement Service Bulletin Number:
MFR Communication Date: 2018-10-01
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 |
ULTIMAAX® Rear Suspension
for Kenworth Vehicles
LIT NO: SP-301
DATE: October 2018
CONTENTS
DESCRIPTION
PAGE
Parts List
■■
46K • 52K Capacity. . . . . . . . . . . . . . . . . . . . 2
■■
60K • 70K Capacity. . . . . . . . . . . . . . . . . . . . 4
Special Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
46K • 52K Capacity
60K • 70K Capacity
REVISION: B
ULTIMAAX® for Kenworth Vehicles
46K • 52K Capacity
29
29
28
26
25
25
27
29
29
28
12
28
11
27
26
28
20
19
12
9
11
14
16
10
20
19
14
15
13
13
22
22
23
24
2
21
8
1
3
21
7
4
17
7
5
6
18
2
SP-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 rear suspension regardless of axle spacing.
Hendrickson Lit. No. 48422-592 – ULTIMAAX Gauge Card can be used to measure in unloaded condition (1) the height of the progressive
load spring (PLS) and (2) the length of cut / split of the shear spring and PLS.
SP-301
3
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
4
SP-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
- OBD2 Bluetooth Scanner Lifetime Update: Ediag Elite offers revolutionary Advantage Lifetime Updates with unlimited access to the superior 15+ reset service, bidirectional testing and full system diagnostics.The Ediag Elite is an excellent Bluetooth OBD2 scanner diagnostic tool ideal for DIY's and private car owners.
- Bidirectional Test for Quickly Locating Problems: The Bidirectional Scan tool allows you to send commands directly from your smartphone to your vehicle for active testing. This feature helps to quickly narrow down problems such as air conditioning clutches, windows, doors, sunroofs, etc., reducing diagnostic time for mechanics and helping DIY users locate faults more easily. In addition, Ediag Elite provides fault analysis and repair guidance to help you solve problems efficiently.
- 15+ Maintenance Resets: The current version introduces 15+ popular special features: Oil Reset, Headlight Matching, Bleeding Reset, TPMS Reset, BMS Reset, Gear Box Relearn, Throttle Learning, Injector Coding, SAS Reset and more special functions in system diagnose menu. These functions make it easy for owners to carry out the necessary maintenance and servicing, ensuring that your vehicle stays in top condition, prolonging its service life and preventing common problems and breakdowns. Note: The Special function vary by model& year, Reach us check compatibility.
- Wide Compatibility CANFD & FCA
Autoauth: Compatible with GM, Ford, Toyota, Chrysler, Honda, Mazda, Nissan, Mitsubishi, Hyundai, KIA with standard OBD2 port from 1996 to newer. More car brands and features will be released gradually. Newest Ediag Elite scanner supports CANFD Protocol and FCA cars. Note: Coverage may vary on different vehicle by model& year ,Please contact us to confirm compatibility before purchase. - Perfect for Monitoring The Health of Your Vehicle: Ediag Elite is designed to make vehicle maintenance simple and efficient. With intelligent Auto VIN quick recognition, it is easy to connect to your car without the need for manual input. Real-time data is visualized in a variety of formats, including graphs, numeric, meter displays and clear 4-in-1 data charts, allowing you to effortlessly monitor real-time data. Data logging/reporting is available for playback and further analysis
- No Annual Fees & 2026 Upgraded CAN FD: Why pay $199/year or more for updates? The 2026 newest Kingbolen K7 obd2 scanner features have been upgraded to Lifetime Updates without subscription fees, saving you significant costs in the long run. K7 scan tool also adds the CAN FD protocol for the latest GM models (2019+), enabling faster data transfer, reducing the risk of undetected errors
- 2026 Newest Top-tier Car Scanner: Kingbolen K7 diagnostic scan tool is equipped with most capabilities for daily repair/maintenance: Wireless diagnosis via Bluetooth, Bidirectional Test, ECU Online/Offline Code, 31+ Resets, PMI for Ford, Lincoln, Mazda, Global version for 100+ brand vehicles and 17 languages, no area limit, FCA AutoAuth
- OE-Level Full Systems Scan Tool: K7 professional diagnostic scanner with Auto Vin can do one-click to scan ECUs on most of vehicles, like pcm, ecm, eps, bcm, tpms, sas, a/c system... to read/clear code, view live data, freeze frame, read ecu info. 4-in-1 data stream graphics can make data viewing more intuitive. Detailed diagnostic reports will help you easily master the car situation as it can be shared by bluetooth or email! Adding workshop information can help your customers to know more
- Bidirectional Test/Active Test & ECU Code: Stop guessing and start fixing. Bidirectional scan tool Kingbolen K7 can perform real active test that can send commands to the vehicle's ECU to drive the actuators to work, like window, rear mirrors, sunroof, door, solenoids, wipers, headlamp, etc, helping you quickly find out bad parts and pinpoint faulty issues. K7 bidirectional scanner will be a good choice to save money and time on car repairs when performing complex maintenance and repair
- 31 Reset Functions: Avoid expensive dealership visits for simple services. Experience tells us that just a small repair service may cost a lot of money. Kingbolen K7 is a professional diagnostic scanner with 31 common maintenance services like Oil /SAS/EPB/TPMS Reset, Battery Matching, ABS Bleeding, Injector Code, etc. It effectively handles most of the car reset and relearning jobs, perfect for experienced DIYers and mechanics. Note: Functions in the menu vary across vehicles. Kindly check the compatibility before purchase
- WHY S608 STANDS OUT:2026 Kingbolen S608 is the only scanner <200 bucks that offers powerful active tests on Engine, ABS, SRS, and Transmission systems. Offers 9 resets,Covers 110+ global brands with a 6.2'' larger touchscreen
- KINGBOLEN'S NEW BIDIRECTIONAL SCAN TOOL: As the 2026 upgraded version of S600, our Newest S608 obd2 scanner has the powerful Bi-directional Control on Engine, ABS, SRS, and Transmission systems. It can send commands to the ECUs of actuators for functional tests and work status checks, such as ABS, fuel injectors, adjusting throttle, coolant pumps, EVAP test, fuel trim reset, etc. No more Guesswork. Quickly identify problem components without teardown, get fuss-free results in seconds.
- 【9 HOT RESET SERVICES CAR SCANNER】Tired of costly mechanic trips for common resets? The Kingbolen S608 obd2 scanner lets you do it yourself, even for beginners—quickly and effortlessly! It offers 9 hot reset functions: Oil/EPB Reset, ABS Bleeding, SAS Calibration, DPF Regeneration, Injector Coding, BMS Matching, Throttle Adaptation, Gear Learning. Stop paying mechanics for 5-minute jobs. Save hundreds per year! 🚗*Function vary from vehicle models. reach us to check compatibility firstly!
- 【4 SYSTEM DIAGNOSTIC TOOL + FULL OBDII FUNCTIONS】Kingbolen S608 is an OBDII scanner and 4 systems diagnostic tool made for home mechanics, DIYers, and professionals. You can access Engine, ABS, SRS, Transmission fault codes, track live data in graphs, and onboard DTC library lookup to find the right troubleshooting procedure, and diagnose with full 10 OBD2 test modes to fix most of emission issues. Give your aging cars routine maintenance to avoid costly repairs, a breakdown, or even a crash.
- 【NEW CAN FD, FCA/RENAULT SGW, 140+ BRANDS】Kingbolen S608 scanner for car supports 140+ vehicle brands, 100,000+ models, 28 languages and can be used worldwide. S608 stays up-to-date with modern vehicles, allows secure access to 2017+ FCA cars and 2015+ Renault cars (📢*Need to purchase an AutoAuth/Renault account by yourself), and supports the latest CAN-FD protocol for 2019+ GM/Chrysler, enabling 2X faster data transfer and more precise diagnostics. 🚗*Check compatibility before purchase.
This product presentation was made with AAWP plugin.
Last update on 2026-05-12 / Affiliate links / Images from Amazon Product Advertising API