Picture a maintenance tech in a distribution center with a length of load chain draped over the hook of a CB series hoist, a rag in one hand, and a grease gun on the floor beside him. He wipes the outside of the links until they look clean, pumps grease along the run, and moves on. Half an hour later the chain looks serviced. The surfaces that actually rub against each other have barely been touched.
Everything here applies to the Harrington CB series load chain and the manual that ships with it. On that chain, contact wear is settled by two things: whether you clean before you lubricate, and whether the lubricant reaches the joint bearing faces inside the links and the load-sheave contact zones. Volume is not the variable. A crew that cleans and greases those two zones on a schedule will outlast a crew that buries the chain in grease once a month.
Four Steps That Keep Contact Wear Down
Chain care for a CB hoist runs in four moves. Check the chain's surface condition. Clean it with an acid-free cleaning solution. Apply lubricant to the link bearing surfaces and the load-sheave contact zones. Then set the reapplication interval from how hard the hoist actually works. Each step guards the one after it, and the order is not optional if contact wear is what you are trying to hold back.
Break that sequence anywhere and it fails in its own specific way. Grease a chain with deformed links or deep nicks and you have lubricated a chain that was already due for replacement; the defects do not fill in. Grease a chain that was never cleaned and the abrasive grit stays exactly where the links bear on each other. Clean and grease correctly but coat the outside of the links, and the two zones that rub stay dry. Do all of it right once a year on a unit running two shifts a day and the film is gone long before the next service.
Read as a decision sequence, each move answers a question the next one depends on. Is this chain still serviceable? Is the surface I am about to coat free of abrasive? Did the lubricant reach the zones that slide? Is the interval matched to the duty class? Get all four and the job is complete. Miss one and a particular wear path stays open, which is why the crew that only owns a grease gun keeps getting the same result.
Where Contact Wear Shows Up First
Two zones on a CB load chain do the rubbing. One is the surfaces where links bear on one another, the contact patches inside each link where the next link presses and slides. The other is the run of chain that contacts the load sheave.
Both zones sit on the load path. When the hoist lifts, force travels link to link through those bearing patches, and the chain wraps and straightens over the sheave under the same load. The outer faces of the links carry little of it. They collect dust, grit, and the odd gouge from whatever the chain bumped into on the floor. A chain can look well greased on the outside and still be wearing at the joints, and that is the normal failure pattern rather than an unusual one.
The manual marks these zones with shaded areas in Figure 6-1, and that figure is the reference. It is a drawing to be read on the page, not a measurement: there is no dimension to copy out of it and no gauge value hidden in the shading. What you take from it is placement, so the first application lands on the joint and the sheave run rather than on the outside of the links.
Read the Chain Before You Grease It
The surface-condition list is short and blunt. The chain should be free of gouges, nicks, dents, weld splatter and corrosion. Links should not be deformed and should not show signs of abrasion. Surfaces where links bear on one another should be free of significant wear. Where a chain fails that list, the instruction is one word: replace.
No number is attached to the list. It is a qualitative condition check with a replace instruction, not a wear-limit gauge, not a percentage of link thickness, not a discard dimension. If your site measures chain with a gauge, that is your own procedure sitting on top of the manual rather than inside it, and it should be written down as such. Inventing a threshold here would be a guess wearing a specification's clothes.
The decision that follows is clean enough to make in the aisle. A chain showing corrosion together with visible wear at the interlink bearing surfaces is a replacement item, and no grease pass changes the outcome. A chain that passes the list is a lubrication item, and everything below applies to it. Running the check before the grease gun comes out is what keeps those two decisions from blurring into each other.
Clean the Chain Before Anything Else
The order is explicit: the load chain should be lubricated for longer life, and that lubrication should be accomplished after cleaning the chain with an acid-free cleaning solution. Cleaning is not a preliminary nicety before the real work. It decides whether the lubricant does anything at all.
Picture what skipping it produces. Grit, metal dust and floor debris sit in the gaps where links bear on each other. Pump grease over that and the abrasive has not been removed; it can be suspended in a carrier and pushed deeper into the contact patch. The bearing surfaces can then work against a paste instead of against each other with a film between them. Wear accelerates on a chain that looks freshly serviced, which is the part that fools people.
Adding the cleaning pass costs time on each service and improves the result of everything after it. Same grease, same interval, same crew, but with the abrasive out of the joint the film actually sits between the metal surfaces instead of being shoved aside on the first lift cycle. The acid-free wording is worth reading on the label too. Not every degreaser on a warehouse shelf qualifies, and the manual names that condition for a reason.
Grease or Oil Depends on Your Service
Two lubricant paths are spelled out for this chain. The first is Harrington lubricating grease, Part No. ER2CS1951, or an equivalent to industrial general lithium grease, NLGI No. 0, applied to the bearing surfaces of the load chain links as indicated by the shaded areas in Figure 6-1. The second is machine or gear oil in ISO VG 32, 46 or 68, or an equivalent, permitted as an alternative with a condition attached: it must be applied more frequently.
That condition is the whole decision. If your crew already runs a lubrication route for gearboxes or other oil-fed equipment in the same bay, go with oil and accept the shorter reapplication cycle that comes with it; the handling is familiar and the product is already on the shelf. Skip oil where it runs off the chain before the next shift, because a film that leaves the contact zone is not protecting anything. The trade-off is plain: grease buys persistence, oil buys convenience, and the convenience is paid for in frequency.
Neither path is a general specification for the category. Both come out of the CB manual and are tied to that chain and those lubricant families. A different hoist brand, a different chain finish, or a maker's own lubricant list may say something else, and that document governs its own equipment. Taking the CB numbers onto another manufacturer's chain is how a good practice turns into an unverified claim.
Where the Grease Actually Needs to Go
Placement decides whether the job counted. On the chain itself the target is the bearing surfaces of the links, the shaded areas in Figure 6-1. Beyond the chain, the manual adds the areas that contact the load sheave, and it is emphatic about the pockets: grease must be applied to the contact areas in the load sheave pockets, not merely to the chain hanging above them.
Aiming at those zones rather than coating the outer link faces changes two things at once. The lubricant lands where sliding contact happens, so the film is doing work on every lift instead of sitting on a surface that rubs against nothing. And you stop spending grease on faces that only gather dust, which is where most of a heavy-handed application ends up.
The sheave pockets are the easiest point to miss. A tech greases the visible run of chain, the chain goes back over the sheave, and the pocket contact areas take the load as each link seats and unseats with whatever transferred by accident. Reading the shaded areas once before the first application, and again when a new tech inherits the route, is the cheap correction.
Three Months Is a Baseline, Not a Rule
The manual gives a 3-month baseline, with more frequent lubrication for heavier usage or severe conditions. That three-month figure is the manufacturer's number, not your number. It is where the schedule starts, and the same line tells you to move off it when the duty gets hard.
Walk the decision on the hoist in front of you. If the unit runs near its rated duty for most of a shift, go with a shorter cycle than three months; the film is being worked harder and giving up sooner. If it sits idle for weeks between jobs, the three-month calendar baseline is a reasonable starting point and the calendar can carry it. Skip treating the three-month line as a checkbox on the PM board, where the entry gets signed and the film still disappears.
The trade-off sits between lubrication labor and chain replacement. Shorter intervals cost tech time on a route already competing with everything else in the bay. Longer intervals cost chain, and wear at the interlink bearing surfaces does not reverse. Matching the interval to the duty class keeps a film on the contact zones instead of letting it vanish halfway through the cycle. That matching is judgment layered on the OEM baseline, not a second published schedule; the manual supplies the baseline and the direction to shorten it, and your duty class supplies the rest.
Dusty Bays Allow a Dry Lubricant
For dusty environments the manual allows a substitution: a dry lubricant is acceptable in place of grease. That is a real allowance rather than a loophole. In a bay generating dust, fiber or fine powder, grease on an exposed chain becomes a collection surface, and a thick layer of grit held against the link bearing surfaces works against the whole point of lubricating.
The switch carries a cost on the other side. If the bay is a dust or fiber environment, go with dry lubricant and expect to revisit the interval with the maker, because the manual does not publish a separate dry-lubricant frequency. The dry substitution is written for dusty environments; if the chain sees wet or corrosive conditions, stay with the grease path this manual describes and confirm the choice with the maker. The trade-off is grit shedding against film persistence, and the environment picks the winner for you.
One point stays open. The manual permits the dry-lubricant substitution but does not state a separate frequency for it, and this article will not invent one. Put the question to the hoist maker or your supplier in writing, and note the answer on the PM record for that unit. Until it comes back, the grease interval does not transfer across unchanged, and the board should show that the question is still open.
Today's version of the job is small. Pull the manual for the exact model on your bay floor, hold the chain up against the OEM surface list, and then write a dated clean-then-grease entry for the two zones that rub, with the interval you chose for your duty class. If the chain fails the surface check, the entry you write is a replacement, not another grease pass.