Car Lift Parts in Des Moines: A Second-Bay Case Study

A Des Moines metro off-road builder asked us in late spring about car lift parts and installation prep for a lift he wanted to add to his second bay. He’d built one bay around a Challenger CL10 five years ago and now wanted a matching lift to speed up brake work on customer rigs. The catch was that his second bay hadn’t been designed for a lift — no dedicated concrete pour, no drop cord, no side clearance for arms. This article is the case study of the site survey we did in Des Moines and the parts and prep decisions that followed. When you’re adding a second lift to an existing shop, the site survey matters more than the lift itself.

The site survey we run before we quote parts

Every second-bay install starts with a site survey. We walk the shop with a measuring wheel, a level, a plumb bob, and a concrete probe. The measuring wheel captures column-to-column spacing options. The level tells us how much slope the floor has (most Des Moines metro shops have three-quarters of an inch of slope over ten feet, and that matters when you’re setting column height reference). The plumb bob confirms the column would go where the customer wants it, given wall studs and door swings. The concrete probe tells us slab thickness and finish quality. All four measurements happen before we talk about lifts or parts.

For our Des Moines metro caller, the site survey took about two hours and produced three findings. First, the slab was only four inches thick, which is under the six-inch minimum for a two-post lift. Second, the second bay had no dedicated 220V drop; the electrical panel was ninety feet away across a shared wall. Third, the door swing on the entry roll-up would clip a lift’s arms if the lift was placed in the customer’s preferred spot. Any one of those findings could have killed the project. Together they meant we couldn’t quote car lift parts until we had a plan for slab, electrical, and layout. Site survey first. Parts second.

Concrete assessment for a Des Moines metro shop

Four-inch slab is too thin for a two-post lift under the ALI standard. The minimum is six inches of properly cured concrete with a compressive strength of at least 3,000 PSI. Our Des Moines metro shop had a four-inch slab poured in the 1980s over compacted fill, which is typical for older second-bay construction in the metro. The compressive strength was probably fine but the depth was not. We priced three options: cut and re-pour a six-by-eight-foot pad under each column, cut and re-pour the entire second bay, or install a specialty engineered anchor system rated for four-inch slabs. Option three was tempting but the anchor system limits future lift options and voids ALI cert.

We ended up going with option one — cut two independent pads. The concrete crew cut the slab, jackhammered out the old material, dug down to a fresh compacted base, and poured six-inch pads with #4 rebar in a grid pattern. Total curing time was 28 days from pour to lift install. During that window we ordered the lift, all the initial car lift parts we’d need for the install, and prep-scheduled the electrical work. Concrete is the slowest step in any second-bay install. Plan around it or the whole project drifts. Our installation prep checklist has the full concrete spec.

Electrical drops and shop layout

Ninety feet of 220V drop is a real electrical project. We priced two options for our Des Moines metro shop: pull the drop through the existing shared-wall raceway (which required an electrician and about eight hours of labor), or run the drop overhead on new conduit (which was faster but visible). He picked the overhead run because his second bay ceiling was already busy with conduit and one more run didn’t change the aesthetic. Cost was in the low-four-figure range for materials and labor.

While the electrician was on site, we had him add a second 110V drop for the shop lighting and a dedicated air-line drop through the column mount. Those additions cost only a few hundred dollars extra when the electrician was already on the ticket. They save weeks of retrofit time later. The layout piece — where exactly the lift columns go — got locked down during this phase too. We shifted the passenger-side column six inches inboard from the customer’s initial spot to give the entry-door arm-sweep clearance. That’s the kind of adjustment that costs nothing at layout time and costs thousands if you have to move a lift after install. Get the site right first, and the car lift parts order follows without surprises.

Overhead vs floorplate for tight ceilings

Our Des Moines metro shop’s second-bay ceiling was 11 feet clear, which is workable for a two-post but tight. Overhead-beam two-posts need about 148 inches of clearance for a 10K unit, and the customer had 132 inches. That killed the overhead option. Floorplate was the answer. Floorplates are the ceiling-shy cousin of overhead two-posts: the cross-tube runs along the floor between the columns instead of over the top. They work fine for passenger cars and light trucks, they don’t require ceiling clearance, and they carry the same ALI Gold cert.

The tradeoff is a hump in the floor between columns that mechanics have to step over. For a brake-heavy shop that isn’t a big deal, and modern floorplates have a low profile compared to older designs. We spec’d a Rotary SPOA10-F (the floorplate variant) which uses many of the same car lift parts as the overhead SPOA10 — same arms, same cables, same power unit — but with the cross-tube on the ground. That commonality mattered because our customer already had a first-bay Challenger CL10, and we could stock a limited common-parts inventory that would cover both lifts for cables, sheaves, and pads. Cross-brand common parts aren’t perfect but they’re close enough on the wear items that a single small parts shelf covers both bays.

The car lift parts order for install and first-year service

The install parts order was straightforward once the lift model was locked in. Rotary SPOA10-F, factory-cut cables, factory sheaves, factory arms with rubber pads, OEM power unit, and the anchor bolt kit rated for the new six-inch pad. Total lead time was six weeks from order to delivery, which lined up cleanly with the concrete cure schedule. We install-crew scheduled the lift for a Thursday, which gave us the weekend to test-cycle it before the shop’s Monday customer work.

We also pre-ordered a first-year service kit: two spare cables (cut and swaged and hanging in the shop), a spare sheave, a rebuild kit for the power unit (in case of a seal weep in the first year, which is more common than the manufacturer will admit), and a spare arm restraint gear set. Total kit cost was in the low four figures. Our Des Moines metro customer thought that was excessive at the time and told us so. Twelve months later he told us the sheave replacement he needed in month nine came out of the kit and saved him a two-week wait for shipping. First-year kits are cheap insurance on a busy shop’s second bay.

Brake service ergonomics on a two-post

Brake service is repetitive, heavy, and hard on backs. The car lift parts we recommend for brake-heavy shops all bias toward ergonomics: extended-height pad adapters (so you’re not stooping to reach lug nuts), air-line drops through the columns (so you’re not tripping over hoses), and cordless-tool holsters that mount to the column (so your impact is always within arm’s reach). None of those items are strictly necessary but they change the mechanic’s day.

For our Des Moines metro overlanding builder doing customer brake work, we added a factory air-line drop kit to the second-bay lift and a set of extended pad adapters. The drop kit is a factory Rotary option that runs the air line through the column and terminates in a quick-connect at the top of the carriage. It looks cleaner than a hose snaking across the floor and it means every vehicle brake job starts with the impact already at the wheel. Small change, big habit shift. Extended pad adapters were a straight parts add — three inches of extra height per pad, which lets a six-foot mechanic reach brake calipers without kneeling. If you’re doing more than five brake jobs a week, both items pay for themselves in mechanic time within a season.

What the second bay looks like in operation

One year post-install, our Des Moines metro shop’s second-bay Rotary SPOA10-F is running smoothly. The lift is used for brake work, oil changes, and light suspension jobs on customer overlanding rigs. Cycle count is running about eight up-cycles per day, which is well within design tolerance. The first-year service kit spared one sheave (month nine, as noted) and one power-unit hose (month eleven, weeping fitting under the reservoir). Neither failure was concerning. Both were expected first-year seating issues that the kit was purchased to cover.

The customer told us during a recent parts reorder that the second bay has doubled his shop’s throughput on brake and quick-service work. The bay that used to be a storage room is now the revenue engine. That’s what a proper site survey and a disciplined car lift parts order can do for a shop. The lift itself is only about forty percent of the total project spend when you count concrete, electrical, and prep. Owners who look only at lift price miss the other sixty percent, and they get caught by surprise when the invoice grows. We tell every second-bay customer the same thing: budget the whole project, not just the lift, and site-survey first.