How to Operate a Manual Chain Block After Checking Attachments

The operating section of the owner's manual for the Harrington CB manual chain hoist fits in a few lines: which side to face, which way to pull the hand chain to raise, and which way to lower. Everything that actually decides whether a lift happens sits in the preoperational checklist printed before it: attachment capacity, damage to load suspension members, chain irregularities, fixed installation, fasteners, clearance, the ANSI/ASME B30.16 gate, and the click of the pawl. Everything below is specific to that cited model and its manual.

That ordering changes what you rehearse. Most operators treat the direction of pull as the skill and the attachment check as a glance on the way past. In the manual, the pull is the last step: by the time your hand is on the chain, the lift has already been authorized or refused by checks that take longer than the hoist movement itself.

Confirm Attachment Capacity Before the First Pull

Rated capacity is the load a piece of lifting equipment is built to hold, and every attachment you hang under the hook carries its own. The manual's first preoperational requirement is to confirm the adequacy of the rated capacity for all slings, chains, wire ropes and all other lifting attachments before use. Read that as a check against the hardware on this lift, not against the hoist's nameplate alone: a hoist rated above the load buys you nothing if the sling beneath it is not.

Because the load travels through the whole assembly in series, the smallest confirmed capacity sets the ceiling for the lift. Which means the number you need is the weakest one in the chain of parts, and it may not be stamped on the hoist at all. In practice, that comparison happens against the slings and wire ropes you actually intend to use, before the hook takes tension.

Inspect the Load Path for Damage

Load suspension members are the parts carrying the load between the hook and whatever holds it: the hook itself, the load chain, and the slings and fittings you attach. The manual directs you to inspect all of them for damage prior to use and to replace or repair all damaged parts, and to verify and correct all chain irregularities before operating the hoist. Deformed links, twists and kinks fall under that second instruction.

A twist or a kink matters for a physical reason: it stops the load chain seating evenly, so the pull is shared unevenly across the links rather than running along them. The manual also tells you to measure and record the k dimension of all hooks, but the text used here does not define where that measurement starts and ends. Treat it as something to look up in the hook section of your own copy rather than a number to guess, because a hook measurement taken between the wrong two points reads as a pass when it is not one.

Check the Hoist Is Fixed and Clear

The manual lists fixed point, fasteners and clearance separately because each fails in a different way. The hoist must be properly installed to a fixed point, and all nuts, bolts and split pins (cotter pins) must be sufficiently fastened. A split pin is the small retainer that passes through a pin or a nut and stops it backing out; its entire job is to be present and to have its legs opened.

That retainer is easy to skip because nothing announces its absence until the fastener it guards starts to walk. Clearance is the same kind of condition: before operating, nothing may interfere with the full range of the hoist's operation. A chain block pulls along one line, so if the load or the chain fouls racking, a mezzanine edge or a doorway partway up, the pull stops being a straight lift and the chain ends up carrying something other than the vertical load the setup was built for.

Use the Manual and B30.16 as the Gate

Two of the manual's instructions are gates rather than checks. Before operating, read and become familiar with Section 4, Operation, and ensure the hoist meets the inspection, testing and maintenance requirements of ANSI/ASME B30.16, the standard the manual names for exactly those three things. The manual points at that standard instead of restating its intervals and acceptance criteria, which means the condition of a unit rests on its inspection record rather than on a fresh visual pass alone.

The same section asks you to record the hoist's Code, Lot and Serial Number from the nameplate in the space provided on the manual's cover. That reads like paperwork, and the reason it belongs in a preoperational list is traceability: with the serial written down, an inspection finding or a part you need to order points back to one specific unit instead of a row of lookalike hoists.

What Comes After the Attachment Check

Only now does the hand chain come into it. The sequence is to face the hand chain wheel side of the hoist, pull the hand chain clockwise to raise the load, and pull it counterclockwise to lower it. The hand chain wheel is the wheel the endless hand chain runs in, geared to the load sheave that the load chain passes over.

The direction is given relative to facing that wheel for a reason: clockwise and counterclockwise mean nothing from the far side of the hoist. Which means position, not memory, tells you which way raises. Stand on that side of the hoist, orient yourself once, and the pull follows. The manual adds one capacity-specific condition to this step: the 20 Ton (CB200) unit requires two operators.

Confirm the Pawl Clicks During Raising

The warning attached to raising is the one that decides whether the load stays up: to prevent a load drop, the clicking sound of the pawl engaging the ratchet disc must be present when a load is being raised. The pawl is a spring-loaded catch that drops into the teeth of the ratchet disc, the toothed wheel that turns with the hoist's gearing, and between pulls it is what holds the load.

For confirming that a lift is holding, that click counts for more than the direction you pulled. Direction tells you which way the load moved; the click tells you the load is being held between pulls, and that is the part you cannot see from the hand chain.

None of that replaces the manual for your specific unit or the pre-lift checks above. If you raise and hear nothing, holding is unconfirmed, and the answer is to stop and settle it against the manual rather than keep pulling and listen harder.

Why These Checks Decide the Lift

Strip the procedure back to what the hardware does and the order stops looking arbitrary. Because a chain block transmits force through a series of parts, meaning the attachments, the suspension members, the load chain, the hook and the pawl, a damaged suspension member or an irregular chain can break that path while the load is in the air, which is why the pre-check works as a go/no-go gate rather than a warm-up. The reason a click, and not a look, confirms holding comes down to where the pawl sits: it is the element named in the warning that engages the ratchet disc and carries the load between pulls, so its sound is the only direct evidence the operator gets that engagement happened.

Run a Bay-Side Pre-Operation Walk-Through

Suppose a warehouse team is moving a crated machine off a delivery pallet with the cited CB unit. Following the manual, the sequence runs: confirm that every sling, chain, wire rope and other attachment in the setup has the rated capacity for the load; inspect the suspension members for damage and correct any chain irregularities; confirm the hoist is properly installed to a fixed point; check that nuts, bolts and split pins are sufficiently fastened; walk the lift path to confirm nothing interferes with the full range of operation; confirm Section 4 has been read and the B30.16 inspection status is current; then face the wheel side, raise or lower the load, and listen for the pawl click on the way up.

That walk-through is an illustration, not a test report. Where a condition in it cannot be confirmed, whether an attachment rating you cannot read, a hook k dimension you have not looked up, or a click you did not hear, the item sits outside the before-operating set and gets resolved against the manual before the load goes anywhere.

Who Should Not Use This Sequence

This is not for readers choosing a hoist by capacity, designing rigging from scratch, or running a different model or a powered hoist; those calls need their own documentation and, for rigging, someone qualified to make them. It is for the warehouse team standing at a cited CB manual chain block with its manual in hand, working to one rule: an unconfirmed attachment or a silent pawl means the lift does not start.