We get the same call from European-marque specialty shops all over the Iowa-Illinois corridor: a technician swears the Bendpak 4-post lift HD-9 is “acting weird” during alignment work, when what’s actually happening is a basic misunderstanding of how the arm restraints and safety-cam engagement are supposed to work. This isn’t a defect. It’s a myth that gets passed from one bay to the next until somebody forces a lockout that isn’t there and bends a slip plate or, worse, drops a car off the rear alignment slots. As the crew that installs and services these racks across Iowa and into Illinois, we want to set the record straight before it costs a shop a five-figure repair.
Browse Bendpak and Challenger 4-post alignment racks built for European-marque work, plus parts and cables we stock for existing installs.
Myth #1: The Safety-Cams Are Just for Storage, Not Alignment Work
The most common myth we hear is that the safety-cam locks on the Bendpak 4-post lift HD-9 only matter when you’re parking a vehicle for long-term storage, and that they can be skipped or half-engaged during a quick alignment check. That’s backwards. Alignment work is exactly when you need the cams fully seated, because you’re loading the runways with steering input, jacking on cross-brace jack beams, and sometimes running the vehicle’s own weight transfer side to side while adjusting camber and toe. Any lateral load on a platform that isn’t cam-locked can walk the carriage on the column, even briefly, and that’s enough to throw your alignment reading off before you even start.
We’ve been out to shops in the corridor where a tech assumed the cam engaged automatically just because the lift stopped rising. It doesn’t. You have to lower onto the lock, confirm the cam has actually caught a rung, and only then start your alignment sequence. On a European-marque car with tight camber tolerances, a half-inch of unnoticed platform drift is the difference between a passed alignment and a comeback. We walk every customer through this exact sequence at installation, and we still get calls from techs who were never shown it because they learned on a different brand.
Myth #2: Arm Restraints Are Optional If You’re Not Using a Rolling Jack
Some shops treat the arm restraints as extra hardware for rolling jack setups only, skipping them entirely when doing alignment work with the factory turnplates and slip plates. That’s a mistake specific to how the HD-9 is built. The arm restraints keep the lift’s structure square under the kind of side-load steering wheel input alignment techs generate constantly, turning the wheel lock to lock while checking toe or bump steer. Without the restraints properly set, that side load transfers into the frame in a way the engineers didn’t intend for sustained alignment cycles.
We’ve seen restraint pins left loose or removed altogether because a previous owner thought they were only there for shipping. On a used or transferred unit, that’s one of the first things we check during a service call in the corridor. It takes five minutes to verify and it’s the kind of thing that never shows up as a problem until the one day it does, usually with an expensive car on the rack and a customer standing in the waiting room.
Why European-Marque Shops Push This Rack Harder Than Domestic Shops
Alignment work on German and other European platforms tends to be more finicky than the domestic trucks and SUVs that make up most general repair volume, and that changes how a shop uses the Bendpak 4-post lift HD-9 day to day. These cars often need multiple ride-height checks, adjustable control arm cams, and sometimes air suspension resets that require cycling the lift up and down repeatedly during a single job. That repeated cycling is exactly where sloppy safety-cam habits get exposed, because a tech in a hurry on the fourth cycle of the day is the one most likely to skip the lock-check step.
We install a fair number of these racks specifically for specialty shops that used to sublet alignment work and decided to bring it in-house. The HD-9’s rated capacity and runway length work well for that volume, but the equipment is only as safe as the habits around it. When we do the walkthrough at install, we spend extra time with alignment-focused shops on exactly this arm restraint and cam sequence because it’s the part that gets skipped under time pressure, not because the lift is complicated.
What Proper Engagement Actually Looks Like
The correct sequence on the Bendpak 4-post lift HD-9 is straightforward once you’ve done it a few times: raise the vehicle to your working height, lower slowly until you feel the carriage settle onto the safety-cam rung, and visually confirm the cam indicator before you touch anything else. Then and only then do you set the arm restraints if you’re running a rolling jack setup underneath for brake or suspension work alongside the alignment. Skipping the order — engaging restraints before the cam is fully seated, or vice versa — is where most of the myths and workarounds we hear about actually originate.
We’ve had techs tell us they engage the cam “by feel” without looking at the indicator, because that’s how they were trained on an older rack. On the HD-9 that’s a gamble we don’t recommend. The indicator exists because feel alone isn’t reliable once a lift has a few thousand cycles on it and the rungs show normal wear. We’d rather a tech add ten seconds to the process than assume.
What We See When Shops Skip These Steps
The damage pattern is consistent across the corridor: slip plates that have walked off-center, alignment turnplate bolts sheared from repeated side load, or in worse cases a carriage that dropped an inch when a cam wasn’t fully caught and the tech leaned on the vehicle to adjust a strut. None of this is a Bendpak reliability problem. It’s a training gap, and it’s the number one reason we get called for a service visit that turns out to be a simple re-education on arm restraints and cam engagement rather than an actual mechanical fault.
We’ve also seen shops confuse a noisy cam engagement with a broken one. The HD-9’s cam mechanism makes an audible clunk when it seats correctly — that’s normal, not a warning sign. The actual warning sign is silence when you expect the clunk, which usually means the cam rode past the rung instead of catching it. Knowing that difference alone prevents most of the panic calls we get.
Freight, Concrete, and Setup Considerations for Alignment Bays
Before any safety discussion matters, the Bendpak 4-post lift HD-9 has to be installed correctly for alignment use specifically, which is a different setup than a general-purpose 4-post. We ask about runway spacing relative to your alignment lift wheel spread, whether you’re running a turnplate kit from the start or retrofitting later, and whether your concrete slab meets the anchor spec for the added lateral loading alignment work generates. We also confirm forklift access on site and whether you’ve got a pit or a flat slab bay, because freight delivery logistics change based on that.
We coordinate delivery timing around your shop’s schedule and weather when it matters, and we require payment at time of install, same as any commercial lift job we run across Iowa and into Illinois. Getting the pad and layout right up front avoids most of the arm restraint and safety-cam confusion later, because a lift installed square and level behaves predictably every single cycle.
Parts, Service, and Keeping the HD-9 Alignment-Ready
Even a well-used HD-9 needs periodic attention to the components tied directly to arm restraints and safety-cam engagement — restraint pins, cam springs, and the cable or chain sync system that keeps all four columns rising evenly. We stock replacement hardware for these lifts and can source part numbers directly when a shop calls in with a number off the parts tag rather than a description. If your cam isn’t seating consistently or a restraint pin has worn its bore oversized, that’s a repair we can usually knock out in a single service visit rather than a full lift replacement.
We tell every alignment shop the same thing: treat the arm restraints and cam engagement checks as part of your daily pre-alignment routine, the same way you’d check tire pressure before a road test. It takes almost no time and it’s the single biggest factor in whether an HD-9 alignment bay stays trouble-free for years or turns into a recurring service call.
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