Harrington Hoists and Cranes CB Hand Chain Hoist - Manual (Page 20)

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Table 5-3 Hoist Inspection Methods and Criteria
Item Method Discard Limit/Criteria Action
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 (34 & 33). Replace.
Brake – Damage to
Brake Surface
Visual Damage due to scratching or gouging by foreign
matter. Refer to Figure 5-2 (37, 38, & 40). 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 (36). 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 5-9.
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 5-10. 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 (39). 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 5-11.
Refer to Figure 5-2 (38).
Replace.
Load Sheave Visual Pockets of Load Sheave should be clean and free
of significant wear. Refer to Figure 5-3 (14). Replace.
Load Gear Visual Teeth have excessive wear or damage. Refer to
Figure 5-4 (25). Replace.
Hand Wheel Visual Large wear or deformation on the surface of hand
wheel. The hand wheel touches the cover. Replace.
Frame and
Mechanical
Components Visual, Auditory,
Function Hoist components including load blocks,
suspension frame, chain attachments, clevises,
yokes, suspension bolts, shafts, gears, bearings,
stripper, pins, and rollers should be free of cracks,
distortion, significant wear, and corrosion. Evidence
of same can be detected visually or via detection of
unusual sounds during operation. Refer to Figures
5-4 & 5-5. Replace.
Chain Guide Visual Excessive wear or press mark. Replace.
Bolts, Nuts and
Rivets Visual, Check
with Proper Tool Bolts, nuts, and rivets should not be loose,
deformed, or corroded. Tighten or replace
as required.
Warning Labels Visual Warning Labels should be affixed to the hoist (see
Section 1.2) and they should be legible. Replace.
Hoist Capacity Label Visual The label that indicates the capacity of the hoist
should be legible and securely attached to the hoist. Replace.