Load Chain Reports
Records should be maintained documenting the condition of load chain removed from service as part of a
Frequent Inspection
Manual Chain Hoists should be inspected at the beginning of each shift. Visual inspections should also be conducted during regular service for any damage or evidence of malfunction which appears between regular inspections.
1.Operation. Check for visual signs or abnormal noises which could indicate a potential problem. Do not operate a hoist unless the load chain feeds through the hoist and hook block smoothly. Listen for “clicking”, binding or malfunctioning. The clicking sound of the pawl on the ratchet gear is normal when a load is being raised. If chain binds, jumps, or is excessively noisy, clean and lubricate the chain. If problem persists, the chain and load sheave may have to be replaced. Do not operate the hoist until all problems have been corrected. Check that hand chain moves freely without binding or excessive drag. Load chain travel should stop when hand chain stops moving.
2.Hooks. Check for wear or damage, increased throat width, bent shank or twisting of hook. Replace hooks which exceed the throat opening discard width (15%) shown in Table 1 (refer to Dwg. MHP0040 on page 6) or exceed a 10° twist (refer to Dwg. MHP0111 on page 6). If the hook latch snaps past the tip of the hook, the hook is sprung and must be replaced. Check hooks swivel easily and smoothly. Repair or lubricate as necessary.
(Dwg. MHP0111)
Table 1: Hook Throat Opening
Model No. |
| Normal |
| Discard | ||
|
|
|
|
|
| |
in |
| mm | in |
| mm | |
|
|
| ||||
SMB005 | 0.94 |
| 24 | 1.09 |
| 27.6 |
SMB010 | 1.00 |
| 26 | 1.18 |
| 30 |
SMB015 | 1.10 |
| 33 | 1.50 |
| 38 |
|
|
| ||||
SMB020 |
|
| ||||
|
|
|
|
|
| |
SMB030 | 1.50 |
| 39 | 1.76 |
| 44.8 |
SMB050 | 1.89 |
| 48 | 2.17 |
| 55.2 |
|
|
|
|
|
|
|
3.Hook Latches. Check operation of the hook latches. Replace if broken or missing.
4.Chain. Refer to Dwg. MHP0102 on page 6. Examine each link for bending, cracks in weld areas or shoulders, transverse nicks and gouges, weld splatter, corrosion pits, striation (minute parallel lines) and chain wear, including bearing surfaces between chain links. Replace a chain that fails any of the inspections. Check lubrication and lubricate if necessary. Refer to “Load Chain” in “LUBRICATION” section on page 7.
(Dwg. MHP0102)
CAUTION
•The full extent of chain wear cannot be determined by visual inspection. At any indication of chain wear, inspect chain and load sheave in accordance with instructions in “Periodic Inspection.”
•A worn load chain may cause damage to the load sheave. Inspect the load sheave and replace if damaged or worn.
5.Load Chain Reeving. Refer to Dwg. MHP0042 on page 9. Make sure welds on standing links are away from load sheave. Reinstall chain if necessary. Check that the last link of the load chain is securely connected. On 2, 3 and 5 ton hoists, make sure chain is not capsized, twisted or kinked. Adjust as required.
Periodic Inspection
According to ASME B30.16, frequency of periodic inspection depends on the severity of usage:
NORMAL | HEAVY | SEVERE |
yearly | semiannually | quarterly |
Disassembly may be required for HEAVY or SEVERE usage. Keep accumulative written records of periodic inspections to
(Dwg. MHP0040)provide a basis for continuing evaluation. Inspect all items in “Frequent Inspection”. Also inspect the following:
6 | MHD56391 - Edition 2 |
