Replacement Chain Rules on a CB Series Chain Hoist

Replacement chain on a CB series hand chain hoist is an ordering decision, not a maintenance-shelf decision. The CB manual treats load chain as a specially heat-treated part supplied at a specified length when the hoist is ordered, and it rules out building extra length into that chain by adding links. Two situations stop that verdict from holding: the hoist is being retired rather than kept in service, or the manufacturer puts an approved alternative in writing. Short of those, you plan the purchase, not the splice.

Picture the maintenance bay: a CB unit on the bench, load chain visibly worn at the contact points, and a purchase requisition open beside it. Everything below is scoped to CB series hand chain hoists. A similar-looking chain out of a shelf bin is a different object from the one the manual describes, and the difference is not cosmetic.

What the Manufacturer Actually Specifies for Replacement Chain

In this manual's terms, replacement chain is a heat-treated chain of a specified length obtained as part of the hoist order, not a length you build in your own shop. Two governing passages sit close together. One says any lift of chain is available on request, and that you simply specify the length of chain desired when ordering. The second is a flat prohibition: never attempt to lengthen the chain by attaching additional chain links to it or by any other means.

Read those lines as a pair and the boundary is clean. Length is a variable you are allowed to choose, and it gets resolved at the point of ordering. Continuity of the chain is not a variable. The manual hands you one lever, how long, and takes away the other, how many pieces. If the job needs more reach than the chain on the hoist gives you, the answer lives on the order line.

Why Heat Treatment Ties Chain to One Supply

This manual does not stop at telling you to buy authentic chain; it states the reason, and the reason is the useful part. Harrington chains are specially heat treated, which is why only authentic Harrington chain should go on the hoist. Heat treatment sets link strength and how the steel wears against itself, and neither property shows up on a caliper. A chain matched on pitch and wire diameter is matched on shape alone.

That gap has consequences. Picking a chain on dimensions can satisfy every measurement you are able to take and still leave it lacking the property that actually carries the load, which means your inspection confirms the fit and says nothing about the part doing the work. Treated steel is what the load path runs through, so a chain that never received that treatment lines up in the sheave while the thing you were relying on is absent. This is why the manual pairs any-lift-on-request with the authentic-chain requirement, and why the cheap substitution turns into the expensive one. You can measure wear; you cannot measure a treatment that was never applied.

Splicing Links Versus Ordering a Longer Lift

Ordering a longer lift and adding links to lengthen a chain end at the same place, a longer chain, and they are not interchangeable. Ordering a longer lift is explicitly provided for; attaching additional links is explicitly prohibited, and the phrase or by any other means shuts the side doors too. The distinction comes down to what a joint does to the load path, because every added connection creates a new point of contact between links, which means a new inspection surface and a break in the continuity the chain was designed around.

My position as a buyer is plain: if you need more chain, order the lift, and do not let anyone in the shop build length out of pieces. What turns that answer around is a hoist at the end of its service life, or an approved alternative the manufacturer confirms in writing — then ordering is no longer the cheaper route and the question becomes what paperwork you hold.

Wear Signs You Can Judge Without the Table

The visual criteria the manual lists for load chain are qualitative, and you can work them with no instrument at all. Surfaces should be free of gouges, nicks, dents, weld splatter and corrosion. Links should not be deformed and should not show signs of abrasion. Where links bear on one another, the surfaces should be free of significant wear. Any of those conditions is a replacement trigger in the manual's own wording.

Lubrication belongs in the same walk-around. Every link's surface should be coated with lubricant and free of dirt and grime, and the chain should not emit a cracking noise while hoisting a load. A dry, gritty chain with sound surfaces is a clean-and-lubricate job in the manual's terms, not a replacement.

On the measured side the manual points to pitch and wire diameter and directs you to discard values in Table 5-8 of the model manual. Those values are table-dependent, and column relationships in a copied or extracted table are not reliable enough to quote secondhand, so this article gives you no figures and no measuring procedure. Open Table 5-8 for your exact model in your own manual and read the two dimensions against the listed discard values there. Any number lifted from a web page, this one included, is not a discard value.

Check Reeving Before You Blame the Chain

Before a worn chain becomes a purchase order, check how it sits in the sheave. Chain should be reeved properly through the load sheave, and on multiple-fall hoists installed properly and free of twists, with the manual's own installation section as the reference. Twists and mis-reeving change how links load against each other, so the wear pattern under your light can be a symptom of routing rather than of chain condition.

The reason to check routing first is diagnostic, not procedural: a fresh chain put back into a twisted reeving can wear the same way, and you will have paid twice for one problem. Where the manual points to its own installation and lubrication sections, that reference is the place to work from; this article covers the inspection logic and does not restate reeving or removal steps, which belong to your model's instructions.

What to Ask Before You Order Replacement Chain

Four things belong on the requisition before anyone puts a caliper on the old chain. Write the lift length you actually need on the order line, since specifying the desired length at ordering is the mechanism the manual gives you. Get written confirmation that the chain supplied is the authentic heat-treated chain for this hoist. Identify which model manual governs the unit and where its discard table sits, so the inspection runs against the right table instead of a remembered figure. And if the hoist is headed for retirement, ask for the approved alternative in writing rather than assuming one exists.

Suppose a spare chain of matching pitch and wire diameter turns up on the shelf, left from another job. Under the wording above it does not substitute, and the way to settle it is a written question to the supplier, not a trial fit. The price of this answer is real: a specified length costs lead time and removes the shelf-spare shortcut, and on a hoist genuinely near retirement that cost is the whole argument for asking before ordering.

Back at the bench, the worn chain is a line on a requisition: the lift you need, the authentic heat-treated chain for this model, and Table 5-8 read in your own manual rather than guessed at. Retiring the hoist, or an approved alternative in writing, is the one documented reason to answer the question differently.