Inspecting a Harrington CB 1 Ton Chain Hoist at Frequent and Periodic Intervals

Copying one monthly inspection calendar across every 1-ton hoist in a warehouse is the most common mistake in a hoist program, and it fails quietly. On a Harrington CB series hoist that works a dock door all day, a monthly card delivers a frequent inspection far slower than the manual's criteria for severe service, which run daily to weekly. The periodic check usually gets folded into the same sheet, so two separate inspections become one routine that satisfies neither.

This is scoped to the Harrington CB series hand chain hoist at 1-ton capacity, and it follows the manual's own order rather than a generic calendar. Service duty is classified first; frequent and periodic inspections then run on their own intervals, with their own inspectors. The sequence below works through that order: initial inspection, classification, the frequent check, the periodic check, confirmation of the record, and the special case of a hoist that only works now and then.

The One-Calendar Mistake With 1 Ton Hoists

Capacity does not set the interval. The manual ties inspection intervals to the nature of the hoist's critical components and the degree to which those components are exposed to wear, deterioration, or malfunction, because that exposure is the thing that actually degrades a hoist between inspections. Suppose a 1-ton CB unit works a dock door all day and an identical 1-ton CB unit is pulled out twice a month for a maintenance lift; they carry the same rating and see very different wear.

Which means a single monthly row in the spreadsheet is a schedule built on the wrong variable. Put that row against every hoist and the plan looks complete on paper while the frequent check runs too slowly where wear accumulates fastest. The file fills with signatures, but no entry ties the duty a hoist actually sees to the interval it was inspected at.

Inspect Before a New or Altered Hoist Enters Service

Before any calendar applies, a new, altered, or modified CB hoist shall be inspected by a designated person prior to initial use, to confirm it complies with the applicable provisions of the manual. That inspection is a gate rather than a formality, because it sets the condition baseline that later frequent and periodic checks are measured against.

For procurement, treat the record as a handover document. Ask for it before the hoist goes into service, and confirm the person named is a designated person under your program rather than a name from a supplier's shipping desk. If the unit is later altered or modified, the requirement starts again, which means the hoist in front of you is not the one covered by the original record.

Classify Service Duty Before Choosing Intervals

Classification is what the interval criteria are keyed to, and the categories run normal service, heavy service, severe service, and special or infrequent service. The reason classification comes first is that one 1-ton rating maps to different frequent and periodic intervals depending on the category, so a calendar written before the classification has nothing to be right about. The class is not a default you can copy from the capacity; it records the exposure judgment, and the manual's categories are the vocabulary for it.

Consider a warehouse with a dozen CB hoists under one maintenance supervisor: three on dock doors running most of a shift, six in a fabrication bay used in bursts, three in a crib that come out for a single lift a month. Writing monthly on all twelve tags is not a conservative choice, it is a guess. Assign a class to each, record the basis that person used — lift frequency through a shift, how hard the chain works, how long the unit sits idle between jobs — and let the manual's interval criteria produce the intervals from there.

Who Runs the Frequent Inspection and When

Frequent inspection is a visual examination by the operator or other designated personnel, and its intervals are monthly in normal service, weekly to monthly in heavy service, and daily to weekly in severe service. Heavy and severe are ranges, which means somebody has to pick a point inside the range and write that point down; leaving a range on the tag defers the decision to whoever happens to be holding the checklist that morning.

Because this check is a visual examination by the operator or another designated person, its job is to catch visible wear or deterioration at the unit between the deeper periodic checks. That is also its limit. An operator-level look does not replace the periodic inspection, and a program that lets it stand in for one has removed a control while keeping the paperwork.

Periodic Inspection Needs a Designated Person

Periodic inspection is a visual inspection by a designated person, with normal service at yearly, heavy service at semiannual, and severe service at quarterly. Unlike the frequent column, these are fixed points per class rather than ranges.

Put the two classifications side by side and the structure explains why they cannot be collapsed. Frequent moves from monthly to weekly-to-monthly to daily-to-weekly as duty hardens; periodic moves from yearly to semiannual to quarterly. They do not compress at the same rate, which means you cannot derive one from the other — both have to be looked up for the class you assigned. The other difference comes down to the inspector: the move from an operator's frequent look to a designated person's periodic inspection changes who owns the finding, and the date on the sheet is the smaller part of that change.

Confirm the Inspection Was Done Correctly

A record that shows an inspection happened should carry three things: the service class that set the interval, which inspection it was — frequent or periodic — and the role that performed it. A box with a tick in it and nothing else tells you that somebody put a checkmark on a form, and nothing about what they were supposed to be doing when they did.

Confirmation is a comparison, not a signature count. Read the class written on the hoist's tag, check the frequent entries against that class's interval, then check that the periodic entry sits on its own calendar with a designated person's name against it. If the tag says heavy service and the frequent entries are monthly, the record matches a normal service program and contradicts the hoist's duty; either the class is wrong or the interval is, and both are worth writing up. The record still has to show which inspection was performed; otherwise the comparison has nothing to work with.

Handle Occasional Service Without Guessing

Special or infrequent service gets no monthly or yearly row. The manual sends it to a qualified person's recommendation before and after each occurrence, with the first occurrence recommended in advance and later ones directed by that person. Because the trigger is the occurrence rather than the calendar, the control that actually works is a written recommendation tied to the job, captured with the lift request instead of sitting in an annual schedule.

That answers the objection readers usually raise here: my hoist only gets used now and then, so can I drop the periodic calendar? If the unit is in regular service, the periodic calendar applies by class, and light usage is not a reason to skip it. If it genuinely belongs in special or infrequent service, the manual hands you a qualified person's recommendation tied to the occurrence, never a default interval to invent. Somebody has to be able to say who qualifies and what they recommended.

Write the service class and the basis for its interval on the inspection tag, next to the capacity, and require the designated person's periodic record to name that same basis. When the tag and the periodic entry disagree, the inspection has not been confirmed, however many signatures are on the sheet.