Harrington Hoists and Cranes (G)NTH Trolley - Manual (Page 24)

24
Table 5-3 Hoist Inspection Methods and Criteria
Item Method Discard Limit/Criteria Action
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 3.2. 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 5-9. 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 (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 5-11.
Refer to Figure 5-2 (30).
Replace.
Load Sheave Visual Pockets of Load Sheave should be clean and free
of significant wear. Refer to Figure 5-3 (18). Replace.
Load Gear Visual Teeth have excessive wear or damage. Refer to
Figure 5-4 (19). Replace.
Hand Wheel Visual Large wear or deformation on the surface of hand
wheel. The hand wheel touches the cover. Replace.
Housing and
Mechanical
Components Visual, Auditory,
Function Trolley-hoist components including suspension
shafts, track wheels, track wheel axles, load
blocks, suspension housing, chain attachments,
clevises, yokes, suspension bolts, shafts, gears,
bearings, stripper, pins, rollers, and bumpers
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. Replace.
Chain Guide Visual Excessive wear or press mark. Replace.