20
Table 5-4 Hoist Inspection Methods and Criteria
Item
Method
Discard Limit/Criteria
Action
Chain Pin
–
Deformation
Visual, Measure The pin should be free of scars or significant
deformation. The “d" dimension should not be less
than discard value listed in Table 5-8.
Replace
Load Chain
– Pitch
and Wire Diameter
Measure
The "P" dimension should not be greater than
discard value listed in Table 5-9.
The "d" dimension
should not be less than discard value listed in Table
5-9.
Replace. Inspect
Load Sheave (and
Idle Sheave for
multiple fall hoists).
Load Chain
–
Surface Condition
Visual
Should be free of gouges, nicks, dents, weld
splatter, and corrosion. Links should not be
deformed, and should not show signs of abrasion.
Surfaces where links bear on one another should be
free of significant wear.
Replace.
Load Chain
–
Lubrication
Visual, Auditory
Entire surface of each chain link should be coated
with lubricant and should be free of dirt and grime.
Chain should not emit cracking noise when hoisting
a load.
Clean/lubricate
(see Section 6.0).
Load Chain
–
Reeving
Visual
Chain should be reeved properly through Load
Sheave. On multiple fall hoists chain should be
installed properly and free of twists. Refer to
Section 3.1.
Reeve/Install chain
properly.
Lifting System
–
Components
Visual, Function
Components should not be deformed, scarred, or
show significant wear.
Replace.
Braking System
–
Components
Visual
Brake Pawl, Pawl Pin, and Pawl Spring should not
be deformed, scarred, or show significant wear.
Refer to Figure 5-2 (27, 24, & 26).
Replace.
Brake
– Damage to
Brake Surface
Visual
Damage due to scratching or gouging by foreign
matter. Refer to Figure 5-2 (32, 30, & 33).
Replace.
Braking System
–
Friction Disc
Visual
The surface of the friction plate should be free of
scars, gouges, and wear. Refer to Figure 5-2 (29).
Replace.
Braking System
–
Friction Plate
Visual, Measure The surface of the friction plate should be free of
grease, oil, scars, gouges and wear and have
uniform thickness. The outer thickness should not
be thinner than the inner thickness. The thickness
should not be less than the discard value listed in
Table 5-10.
Replace.
Braking System
–
Bushing
Measure
The bushing should have uniform thickness. The “t”
dimension should not be less than the discard value
listed in Table 5-11.
Replace.
Braking System
–
Bushing
Visual
When slightly heated, the bushing should be so
lubricated that lubricant oozes off the surface. Refer
to Figure 5-2 (31). Type of oil to be used: ISO
VG68 or equivalent.
Soak bushing in
machine oil for one
day.
Braking System
–
Ratchet Disc
Measure
The “D” dimension should not be less than the
discard value listed in Table 5-12.
Refer to Figure 5-2 (30).
Replace.
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