The crew checks the chain, the hook and the latch, looks up at the beam, decides it looks substantial, and hangs the trolley. That order is backwards, and it is the mistake that puts a unit back on the floor after it is already mounted on the steel.
Harrington's CB series manual puts the support question ahead of the mounting question: before attaching the hoist, all attachment points, suspension components and supporting structure have to be adequate to support the hoist and its load. Its trolley counterpart, the TF2/TS2 manual, applies the same rule to the trolley beam and its supporting structure, and where the answer is not obvious it directs the installer to a professional qualified to evaluate the suspension location and its supporting structure. Read the two together and the beam's own rating becomes the wrong place to start. What gets checked is the path the load takes from the hook into the building steel.
The Support Check People Skip Before Mounting
The shortcut is familiar. A hoist arrives, so the team verifies what arrived: chain condition, hook, latch, nameplate. Welds look sound, paint is intact, and the beam carried the last unit without complaint. Then the trolley goes up, and the support question the manuals put first was never asked.
A visual pass answers how a beam looks. It says nothing about whether the suspension location was ever sized for what is about to hang from it. Because the manuals order it that way, the sequence itself is the finding: if nobody can name who evaluated the beam and its supporting structure, the evaluation has not happened.
What that costs is rarely dramatic. It shows up as rework: a mounted unit that has to come back down, an area cleared for a lift that then does not run, an inspection conversation with no document behind the suspension location.
Add Trolley, Hoist, and Load First
Three things get added before anything goes onto the beam: the trolley, the hoist and its loads. That is the trolley manual's list, and the CB manual frames the same requirement from the hoist's side, naming attachment points and suspension components as well as the supporting structure. Neither passage gives a number for your building steel. Both tell you which contributors the support has to be checked against.
Keep each statement with the document it came from: trolley, hoist and loads from the TF2/TS2 trolley manual, attachment points and suspension components from the CB series manual for these hand chain hoists. Together they describe one installation from opposite ends, and neither is a structural evaluation of your building.
Consider a bay where a manual hoist of one capacity has hung for years and a heavier unit is going into the same spot. Nothing about the beam has changed. Trolley, hoist and loads have all changed, and every one of those three is a slot the support has to be checked against. Suppose the site file documents only the original installation; then the file describes a different combination than the one going up, and the older paperwork is not evidence for the new lift.
Why a Beam Rating Is Not a Support Rating
A beam's rating describes one member, under the conditions it was rated for. Load does not stop at that member. It travels into whatever the beam hangs from — hangers, brackets, connections, the runway, the building steel above — and the reason the manuals name the beam and its supporting structure together is that the path, not the member, is what carries the hoist. Which means the weakest element along that path sets the limit for the whole installation.
A rating is also tied to span, end conditions and how the load is applied, so the same section can be adequate in one bay and inadequate in another. A figure read off the beam tells you what that member can do under someone else's assumptions, not what your installation can do under yours.
Seat the Fixed Point in the Hook Saddle
Once the support is settled, the attachment has its own requirement. Attach the hoist's top hook to the fixed suspension point, then confirm that the point rests on the center of the hook's saddle and that the hook's latch is engaged. Naming the center matters: the saddle is the curved seat the hook was shaped to bear on, and a point sitting off-center moves the load toward the tip, which side-loads a hook built to take its working load in the seat.
Engaging the latch is a separate condition, not a formality. Its job is to keep the suspension point from working out of the throat when the chain goes slack. A hook that is on is not the same as a hook that is seated, and the seating is what the next section of the manual comes back to check.
Confirm the Install Before the First Lift
Start with the suspension members. Inspect them for damage before use, and replace or repair any damaged part before the unit goes into service.
Then work through the rest in the order the manual sets. Verify and correct chain irregularities before operating the hoist, since a twisted or kinked chain changes how the load sits in the first link that takes it. Confirm the hoist is properly installed to a fixed point, and confirm all nuts, bolts and split pins are sufficiently fastened, because a fastener that is not fully made up is a joint that has not been assembled. Finish by confirming rated capacity for all slings, chains, wire ropes and every other lifting attachment in the rig, which checks the whole assembly rather than the hoist alone. Each step closes a different part of one load path — chain to hook, hook to fixed point, fixed point to structure, hardware holding the assembly together — which is why the sequence reads as a walk down that path rather than a list of unrelated items.
Two more lines in the same list point outward: measure and record the k dimension of all hooks, and consult a table in the inspection section. A measurement with no defined starting point is not a check, and a table is only usable when its columns clearly line up with the dimensions they name. Take it back as a documentation question: what the k dimension is measured from, what the wear limit is, and where the record is kept. Guessing the geometry from the hook in your hand is not a substitute for an answer. One more line tends to get skipped: record the hoist's Code, Lot and Serial Number from the nameplate in the space the manual provides, so an inspector can tie the unit to its paperwork later.
When to Stop and Call a Qualified Evaluator
Both manuals hand the adequacy judgment to a qualified evaluator once the answer stops being obvious. Triggers are easier to recognise than to define: no drawing or rating for the supporting structure, building steel that has been altered or cut since the drawings were made, a beam that is not the one in the site file, an outdoor location, which both manuals send to separate installation sections without spelling out the requirements here.
Stated short, the tradeoff is a call to a qualified evaluator against a mounting that has to be undone, with the hoist already hanging and the area already cleared for a lift that then does not run. Evaluation is the cheaper item, and the only one that produces a document you can hand to an inspector.
This walkthrough is not for the reader whose building steel has no documentation behind it: that judgment belongs to a qualified evaluator, not to a maintenance checklist. It is for the operations lead who has the documents in hand and needs the order in which to use them, starting with who signed off on the steel.