4.CHAIN. Refer to Dwg. MHP0102 on page 7. 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.
Welded Area
Diameter
Wear in these areas
(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 load sheave. Inspect 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. On 6 ton hoists, make sure chain is not capsized, twisted or kinked. Ensure chain stopper is installed in last link of load chain. Adjust as required.
6.HAND LEVER. Check for cracks, bending and other damage. Replace if necessary.
Periodic Inspection
According to ASME B30.21, 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 records of periodic inspections to provide a basis for continuing evaluation. Inspect all items in “Frequent Inspection”. Also inspect the following:
1.FASTENERS. Check rivets, capscrews, nuts, cotter pins and other fasteners on hooks and hoist body. Replace if missing and tighten or secure if loose.
2.ALL COMPONENTS. Inspect for wear, damage, distortion, deformation and cleanliness. Disassemble and check gears, shafts, bearings, sheaves, chain guides, springs and covers.
Replace worn or damaged parts. Clean, lubricate and reassemble.
3.HOOKS. Inspect hooks for cracks. Use magnetic particle or dye penetrant to check for cracks. Inspect hook retaining parts. Tighten, repair or replace if necessary. Refer to the latest edition of ASME B30.10 (Hooks) for additional hook inspection information.
4.CHAIN SHEAVES. Check for excessive wear or damage. Replace if necessary.
5.BRAKE. Ensure proper operation. Brake must hold hoist rated capacity. If load test indicates the need, disassemble. Brake disks must be free of oil, any grease, unglazed and uniform in thickness. Refer to “MAINTENANCE” section for allowable brake disk wear. Check all other brake surfaces for wear, deformation or foreign deposits. Inspect gear teeth, pawl and pawl spring for damage. Check that brake pawl stops counterclockwise rotation of ratchet gear. Clean and replace damaged components as necessary.
6.SUPPORTING STRUCTURE. If a permanent structure is used, inspect for continued ability to support load.
7.LABELS AND TAGS. Check for presence and legibility. Replace if necessary.
8.LOAD CHAIN. Measure chain for stretching by measuring across five link sections all along chain length, refer to Dwg. MHP0041 on page 7. When any five links in the working length reach or exceed discard length shown in Table 2, replace entire chain. Always use a genuine Ingersoll Rand replacement chain.
Gauge Length
(Dwg. MHP0041)
Table 2
Model | Chain Size | Normal | Discard | |
No. | (mm) | Length (mm) | Length (mm) | |
|
|
|
| |
SLB150 | 6 x 18 | 90 | 92.3 | |
| ||||
SLB200 | ||||
|
|
| ||
|
|
|
| |
SLB300 | 7.1 x 21.2 | 105 | 107.6 | |
|
|
|
| |
SLB600 | 10 x 30 | 150 | 153.7 | |
| ||||
SLB1200 | ||||
|
|
| ||
|
|
|
|
9.CHAIN STOPPER. Ensure chain stopper is installed in last link of anchor end of load chain. Replace if missing or damaged. Refer to ‘Attaching End of Load Chain’ in “MAINTENANCE” section.
Hoists Not in Regular Use
1.Hoists which have been idle for a period of one month or more, but less than one year shall be given an inspection conforming with requirements of “Frequent Inspection” before being placed into service.
2.Hoists which have been idle for a period of over one year shall be given a complete inspection conforming with requirements of “Periodic Inspection” before being placed into service.
3.Standby hoists shall be inspected at least semiannually in accordance with requirements of “Frequent Inspection”. In abnormal operating conditions, equipment should be inspected at shorter intervals.
MHD56109 - Edition 9 | 7 |
