Harrington Hoists and Cranes (G)NTH Trolley - Manual (Page 23)

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Table 5-3 Hoist Inspection Methods and Criteria
Item Method Discard Limit/Criteria Action
Hook – Swivel Visual, Function Bearing parts and surfaces should not show
significant wear, and should be free of dirt, grime,
and deformations. Hook should rotate freely with
no roughness. See Figure 5-1. Clean/lubricate, or
replace as required.
Hook – Yoke
Assembly
Visual Should be free of significant rust, weld splatter,
nicks, and gouges. Holes should not be
elongated, fasteners should not be loose, and
there should be no gap between mating parts. Tighten or replace
as required.
Hook – Idle Sheave
and Shaft (Multiple
Fall Hoist)
Visual, Function Pockets of Idle Sheave should be free of
significant wear. Idle Sheave surfaces should be
free of nicks, gouges, dirt, and grime. Bearing
parts and surfaces of Idle Sheave and Axle should
not show significant wear. Idle Sheave should
rotate freely with no roughness or significant free
play. Clean/lubricate, or
replace as required.
Hook – Hook
Latches
Visual, Function Latch should not be deformed. Attachment of
latch to hook should not be loose. Latch spring
should not be missing and should not be weak.
Latch movement should not be stiff - when
depressed and released latch should snap smartly
to its closed position. Replace.
Yoke – Top Pin
Hole Deformation
Visual, Measure The "d" dimension of the top pin hole should not
be greater than the discard value listed in Table 5-
5. Replace Hook Set
Top Pin –
Deformation
Visual, Measure The pin should be free of scars or significant
deform
ation. The “d" dimension should not be
less than discard value listed in Table 5-6.
Replace
Yoke – Chain Pin
Hole Deformation
Measure The "d" dimension of the chain pin hole should not
be greater than the discard value listed in Table 5-
5. Replace Hook Set
or yoke.
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 5-7. Replace
Load Chain – Pitch
and Wire Diameter
Measure The "P" dimension should not be greater than
discard value listed in Table 5-5. The "d"
dimension should not be less than discard value
listed in Table 5-8. 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).