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MHD56109 - Edition 9 7
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.
(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.
(Dwg. MHP0041)
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.
Diameter
Welded Area
Wear in
these areas
Table 2
Model
No.
Chain Size
(mm)
Normal
Length (mm)
Discard
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
Gauge Length