The words “height limit switch” do not tell a buyer how a crane’s existing warning arrangement is built. The catalog lists a wired XCMG crane A2B height limit switch and a wireless crane height limit switch separately. Treat them as separate lookup references. The descriptions are not an invitation to replace a wired arrangement with a wireless one.
Ask the responsible service technician to identify the part using the machine documentation. Record the crane model, serial and the original device label if it can be photographed safely. If the service history shows that a different system was fitted, identify that change and keep it separate from the original build details. A quotation based solely on crane model may not account for a change made during an earlier repair.
A visible cable may help explain a wired anti-two-block switch request, but a photo does not establish the electrical characteristics or system logic. A wireless height limit switch inquiry should identify the original arrangement and any related equipment the technician says is part of the match. Do not guess that a transmitter will work with another receiver because the housings or brand names look similar. Ask for the supplier’s documented identification and leave system acceptance to qualified personnel.
For a crane A2B switch inquiry, describe what the workshop has requested: a single device, a complete set or a separately identified accessory. Do not assume a seller includes a receiver, cable, mounting piece or other item simply because it appears in a product photo. List the items required by the work order, and ask the supplier to mark what comes in the offer. If a component is missing from the proposed scope, flag it before the quotes are compared.
If the machine is unavailable for further inspection, send the clearest records you already have and explain what cannot be confirmed. Ask the supplier to return a conditional quote rather than a firm fitment claim. Do not ask an operator to exercise a suspect system to capture a sales video. This article concerns the purchasing record; inspection, repair and verification of a protective system are outside its scope.
A seller may offer a different device or describe a replacement as an upgrade. Keep that proposal separate from the like-for-like line. Ask it to state the proposed reference, what equipment it expects to be used with it and what written evidence supports the match. An alternative arrangement requires review by the party responsible for the machine, not a purchasing decision based on price or delivery speed alone.
Once an offer is approved, save the original label, supplied reference and scope with the work order. Receiving should check the package against that record before issuing it. If the shipment contains a different revision or omits an item on the approved list, record the discrepancy. A delivery inspection confirms that the ordered items arrived; it is not a functional or safety acceptance check.
Do not assume interchangeability. The original system and the approved replacement configuration need to be identified from the crane’s documentation and checked by the responsible service team. A generic product listing does not establish that a conversion is supported.
When several cranes are being serviced, use the crane serial number on each purchase line. It is easier to match each package to an approved repair when the devices arrive together and their labels use similar wording.
Keep the written approval with the machine’s service record so the next parts request starts with the installed arrangement, rather than an old catalog description.
Keep unresolved switch identification on a fitment hold. The load cell label guide applies the same evidence trail to a different crane safety-system component.
