How to check a hand chain hoist?

2.11 Chain hoist 2.11.1 The sprocket disc, shackles, and chain of the chain hoist must not be used if they are deformed or twisted. 2.11.2 The manual chain puller should be positioned directly below the chain block; the force applied must be even and gentle, avoiding excessive force that could cause the chain to jump or the clasp to get stuck. 2.11.3 The operator must be aware of the lifting capacity of the chain block as well as the weight of the object being lifted. The wire rope used must be suitable for that chain block, and it must not be used beyond its specified limits. 2.11.4 The load to be lifted must be securely fastened, and sharp edges or corners should be protected; it is not allowed to use hands to adjust tight knots or slippage in ropes or chains. 2.11.5 Lifting must be carried out vertically; it is not allowed to lift fixed objects or hazardous items such as those that are flammable or explosive.

The “JB 9010-1999 | Safety Rules for Chain Hoists” specifies the following: 5.1 Daily Inspection and Maintenance 5.1.1 Check the lifting chain for excessive wear, corrosion, deformation, and external damage. 5.1.2 Verify that all moving parts rotate smoothly and that fasteners are not loose. 5.1.3 Inspect the hook for wear and deformation; it should be free from cracks, sharp edges, burrs, corrosion, warping, or twisting. 5.1.4 Lubricate all moving parts regularly with grease, and ensure that the friction surfaces of brakes are clean and free of oil to maintain reliable braking performance. 5.1.5 Apply lubricant to the lifting chain regularly during use, and prevent it from getting covered with dirt or other debris, as this could accumulate in the grooves of the chain wheels and affect proper engagement. 5.1.6 Stored chain hoists should be kept in a dry place; when not in use for an extended period, they should be properly protected and stored. 5.2 Periodic Inspection and Maintenance 5.2.1 The interval between inspections should be determined based on the frequency of use and the operating environment, but it must be at least once a year. 5.2.2 Disassembly and inspection must be carried out by personnel familiar with the product’s structure and performance, in accordance with the instructions provided in the user manual. 5.2.3 After disassembly and reassembly, the chain hoist must undergo dynamic load tests and braking tests as specified in JB/T 7334; it can only be used again if it meets these requirements. The list of items for daily and periodic inspections is provided in Appendix B, which is part of this standard. 6. Standards for Replacing Key Components Key components should be replaced if any of the following conditions occur: 6.1 Hook a) Wear on the cross-section exceeds 10% of the nominal size b) Cracks c) Plastic deformation in critical sections or the shank d) Increased size of the hook opening by more than 15% of the nominal size e) Twisting deformation exceeding 10° 6.2 Lifting chain a) Wear on the diameter of the chain links exceeds 10% of the nominal size b) Elongation of the link pitch exceeds 3%, with individual link pitches elongating by more than 5% c) Cracks or other harmful defects 6.3 Gears a) Wear on the tooth thickness exceeds 10% of the nominal size b) Cracks c) Broken teeth 6.4 Wear on the friction pads exceeds 25% of the nominal size 6.5 Wear on the dimensions of the gear grooves exceeds 10% of the nominal size 6.6 The gap between the shaft and bearings increases by more than 15% of the nominal size 6.7 Severe wear or corrosion on ratchets, pawls, and springs. It is also recommended that the reader refer to the standards “JB 9010-1999 | Safety Rules for Chain Hoists” and “JB/T 7334-2007 | Chain Hoists”.

Since a comprehensive inspection cannot be carried out based on appearance alone, why not use a trial adjustment method during lifting? Additionally, increase the load capacity of the hand chain hoist.

Today, the chain hoist at the company malfunctioned; something fell and killed a person. . .