An alignment rack is two pieces of equipment working as one. There is the lift — a scissors lift or 4-post lift that raises the vehicle — and there is the alignment system — the cameras, sensors, targets, and computer that measure and adjust wheel angles. When a shop has alignment problems, the instinct is to blame the alignment system. Recalibrate the cameras. Replace the targets. Update the software. But in our experience servicing alignment equipment across Iowa, the problem is on the lift side more often than most shops realize.
At Auto Lift Services, we are an authorized Hunter Equipment dealer and we service alignment lifts across Iowa. We handle the mechanical side — the lift, the turn plates, the slip plates, the rolling jacks — while coordinating with Hunter’s service network for the electronic alignment system. This article covers what goes wrong with alignment racks and how to tell whether your alignment issues are coming from the lift or the sensors.
The Lift Side — Where Mechanical Issues Hide
Runway Levelness
An alignment rack must be level. Not approximately level. Level to within millimeters, measured with a transit across all four corners of the lift. When we install a scissors lift for alignment work, the leveling process uses magnetic yardsticks at each corner and a transit reading in millimeters — because inches are not precise enough for alignment work.
Over time, concrete settles. Anchor bolts loosen. Shims compress. A lift that was dead-level at installation can develop enough tilt after a few years to introduce measurable alignment errors. If your alignment readings have gradually drifted and recalibration only fixes them temporarily, the lift may have shifted.
We check runway levelness as part of our alignment rack service. If the lift has moved, we re-level and re-torque anchor bolts.
Turn Plates
Turn plates sit in the runways under the front tires and allow the wheels to pivot freely during alignment measurement. When turn plates bind, stick, or do not center properly, the alignment readings are contaminated by friction and resistance that mask the actual wheel angles.
Binding is the most common turn plate issue. Dirt, rust, and debris accumulate in the bearing surfaces. Road salt — a constant in Iowa winters — accelerates corrosion. Turn plates that do not spin freely need to be cleaned, lubricated, or rebuilt. In severe cases, the bearing surfaces are pitted enough to require replacement.
Centering. Turn plates should return to center when the vehicle rolls off. A turn plate that sits off-center introduces a toe error into the initial measurement that the technician then “corrects” — creating a real toe error where none existed.
Slip Plates
Slip plates sit under the rear tires and allow lateral movement during alignment. They serve the same purpose as turn plates but for the rear axle. Stuck slip plates prevent the rear suspension from settling naturally, which produces incorrect rear alignment readings.
Rolling Jacks
On alignment-configured scissors lifts, rolling jacks lift the vehicle by the tires rather than the frame. This allows the suspension to hang naturally during alignment. Rolling jack issues — slow response, uneven lifting, rail binding — directly affect the suspension position during measurement.
When we install rolling jacks, the pumps face the direction the customer prefers and the rollers are carefully seated on their rails. Over time, roller wear, rail contamination, and hydraulic seal degradation affect performance. We check rolling jack function during every alignment rack service visit.
The Alignment System Side
While the lift side is our primary expertise, we work alongside Hunter’s service network on the complete system. Here is what we see on the electronic side:
Camera and sensor alignment. The cameras that read the wheel targets must be precisely positioned relative to each other and to the lift centerline. Physical impacts (a tech bumping a camera tower with a vehicle), building settlement, or thermal expansion can shift camera positions. Hunter’s calibration procedure corrects this, but only if someone runs it regularly.
Target condition. The reflective targets that clamp to the wheels are precision instruments, not accessories. Scratched, dirty, or damaged targets produce inaccurate readings. We have seen shops troubleshoot an alignment system for hours when the problem was a scratched target that cost $50 to replace.
Software updates. Alignment specifications change as new vehicles enter the market. Running outdated software means the system may not have correct specifications for newer vehicles, leading to alignments that are “in spec” according to the system but incorrect according to the manufacturer.
Diagnosing Lift vs. Alignment System Issues
When an alignment rack produces questionable results, here is how to determine whether the problem is mechanical (lift side) or electronic (alignment system):
Run a compensation check. If the compensation readings are unstable or vary significantly between runs, the lift is likely involved — the vehicle is not stable on the platform.
Check turn plate and slip plate freedom. Spin the turn plates by hand. They should rotate freely with minimal resistance. If they are stiff or gritty, clean and lubricate them before running any diagnostic.
Level check. Put a precision level on each runway. If the lift is out of level, fix that before chasing electronic calibration issues.
Repeat readings without moving the vehicle. Run the alignment measurement twice without touching anything. If the readings are different, something is physically shifting — a binding turn plate, a loose wheel target clamp, or a lift platform that is not stable.
If all mechanical checks pass and the system still produces inconsistent results, it is time to call Hunter for electronic calibration and diagnosis.
Maintenance Schedule for Alignment Racks
Weekly (operator): Spin turn plates and slip plates by hand. Clean debris from plate surfaces. Verify rolling jacks respond and lift evenly.
Monthly (operator): Check target condition. Clean target reflective surfaces. Verify camera tower positions have not shifted visually.
Quarterly (professional service): Full lift service — anchor bolt torque check, runway level verification, turn plate and slip plate service, rolling jack hydraulic check, lock mechanism test, grease slide blocks and pivot points.
Annually (certified inspection): Full lift inspection plus alignment system calibration verification. This is the visit that documents your equipment compliance and catches developing issues before they affect your alignment quality.
Alignment Rack Service Across Iowa
Auto Lift Services services alignment racks across the state of Iowa. We handle the mechanical side — the lift, the turn plates, the slip plates, the rolling jacks, the hydraulic and pneumatic systems — and coordinate with Hunter for the electronic alignment system when needed.
If your alignments are producing inconsistent results, comebacks, or readings that do not match what you see on the vehicle, call us at 800-674-9302 or email info@autoliftserv.com. The problem might be your cameras — but it might be your turn plates, your lift level, or a rolling jack that is not doing its job. We will figure out which one.
Our Clients Include: