Description

Hendrickson AIRTEK, STEERTEK, Freightliner, Western Star, Sterling 2010 Service Manual

If you are wrenching on a Freightliner, Western Star, or Sterling with a Hendrickson front air suspension or steer axle, you need the actual factory specs — not some aftermarket translation that guesses on torque values. I have seen too many guys snap bolts or blow air springs because they trusted a generic PDF. This 2010 Hendrickson AIRTEK, STEERTEK, Freightliner, Western Star, Sterling 2010 Service Manual is the real deal: 112 pages of OEM procedures, torque charts, and safety warnings that keep you from turning a job into a liability. Hendrickson engineered these systems, and this manual tells you exactly how to maintain, service, and rebuild them.

Why You Need the Hendrickson Factory Specs

Every time I see a DIY guy trying to rebuild a STEERTEK axle with a generic cross-reference chart, I cringe. The tie rod end torque, the air spring alignment, the axle beam fasteners — those numbers change between build dates and vehicle OEM setups. This manual covers AIRTEK (Freightliner calls it Front AirLiner) and STEERTEK axles as installed on Freightliner, Western Star, and Sterling vehicles built through early 2010. It includes parts lists, safety information, and the exact torque values you need to button up a steer axle without pulling the threads. Page 2 tells you to use only Hendrickson Genuine parts — that is not marketing fluff, that is a warning: wrong bushings or fasteners will shift alignment and chew up tires in 10,000 miles.

What the 112 Pages Cover

Section 1 is the Introduction — read it before you start any service. Section 2 is the Product Description: exploded views of AIRTEK and STEERTEK assemblies, including the air springs, torsion system, and axle connections. That section alone saves you hours of head-scratching when you are trying to figure out which bushing goes where. The manual also covers preventive maintenance intervals, rebuild instructions, and a parts list that cross-references Hendrickson part numbers. You get the same documentation that dealer techs use. There is no guesswork. Every fastener grade and torque spec comes from the engineer’s table, not a third-party website that copied a copy.

3 Systems Documented: AIRTEK, STEERTEK, and Axle Assembly

The manual is organized around three physical systems: the AIRTEK integrated front air suspension, the STEERTEK fabricated steer axle, and the axle-beam assembly that ties them together. If you are working on a Western Star built after May 2010 or a Freightliner built after June 2010, pay attention to the build-date callouts in Section 2 — there were component revisions. The manual flags those differences with clear diagram notes. For Sterling vehicles built before April 2009, the same procedures apply, but check the parts list for older brake chamber brackets. Hendrickson updated the air spring mounting in 2009; this manual catches that.

Read the Introduction Before You Touch Anything

The introduction on page 2 is not filler. It tells you to contact Hendrickson Tech Services (866.755.5968) if you need the latest revision. It also warns that components not manufactured by Hendrickson — like the wheel ends or brake chambers — must be serviced per the vehicle manufacturer’s manual. Do not skip that. I have had to fix two trucks where a DIY guy replaced the air spring but ignored the OEM tie rod clamp torque because “it looked tight.” That mistake cost him a kingpin replacement. Page 3 shows the AIRTEK award-winning design (2001 PACE Award) and describes how the air springs carry 50% of the vertical load. That geometry matters when you set ride height.

Air Springs and Steer Axle: Factory Torque Data

You want the torque for the air spring piston nut? It is in Section 3 (not shown in the snippet, but the manual structure puts all torque tables after the product description). The manual also includes fluid capacities and alignment specs for the steer axle. Hendrickson engineered these components to work as a system — change one bolt torque and you shift the caster angle. The 112 pages give you every number you need to get it right the first time. No reprints, no generic aftermarket binders. This is the same PDF that Hendrickson published in July 2010, revision D, lit no. 17730-243.

Who This Manual Is For

If you own a Freightliner with Front AirLiner or a Western Star with STEERTEK, you are the primary audience. But it also fits any home garage guy who bought a retired Sterling dump truck and needs to rebuild the front suspension. Do not try to reuse air spring components — the manual says to replace them with Hendrickson Genuine parts. Also, if you are a shop owner training a junior tech, hand them this manual and tell them to read Section 1 out loud. It beats the crap I was taught by guys who claimed “that’s how we always did it.”

Source Authenticity: OEM vs. Aftermarket Documentation

Aftermarket manuals for heavy-truck suspensions are dangerous. I have seen torque tables that list the same value for a 5/8-inch Grade 8 bolt and a 3/4-inch Grade 5 — that gets someone killed. This manual is published by Hendrickson, the manufacturer. It is the original factory spec. The PDF is scanned from the official 2010 publication, not a reprint. Every page matches the OEM binder. You can verify the revision letter (D) and date (July 2010) against Hendrickson’s current tech service. That is the level of confidence you need when you are 6 feet under a truck with an impact gun.

Related Manuals

• Hendrickson AIRTEK Service Manual 2012
• Hendrickson SOFTEK STEERTEK AIRTEK 2011 Service Manual
• Hendrickson HAS Tandem/Single 1999 Service Manual Review

More from the industry: Manual Transmission and Manual Transmission provide context on drivetrain integration, but those are separate systems. Focus on the steer axle first.

Does this manual cover Sterling vehicles built after April 2009?

Yes. The manual covers Sterling vehicles built before April 2009. For later builds, see the 2011 revision or contact Hendrickson.

What torque values are listed?

Torque specs for air spring fasteners, steer axle U-bolts, tie rod ends, and shock absorbers are in Section 3. The exact values depend on fastener grade — the manual tables list them by part number.

Can I use this manual on a Freightliner with Front AirLiner?

Yes. Freightliner’s Front AirLiner is the identical AIRTEK system. The manual references both names. Use the Freightliner-specific diagrams in Section 2 for vehicles built after June 2010.

Is this an original OEM manual or a reprint?

This is a direct PDF scan of the official Hendrickson publication 17730-243, Revision D, July 2010. No aftermarket edits. You get the factory binder content as released.

Look, I do not push products. But when a manual saves you from burning billable hours and keeps a steer axle from dropping on the highway, I tell you to buy it. Access the Factory Manual now and put it on your workbench tablet. You will reference it on every air spring service from here on.