Harrington Hoists M3 manual 20

Table 5-3 Hoist Inspection Methods and Criteria

Item	Method	Discard Limit/Criteria	Action
Braking System –	Visual	Brake Pawl, Pawl Pin, and Pawl Spring should not	Replace.
Components		be deformed, scarred, or show significant wear.
		Refer to Figure 5-2 (34 & 33).
Brake – Damage to	Visual	Damage due to scratching or gouging by foreign	Replace.
Brake Surface		matter. Refer to Figure 5-2 (37, 38, & 40).
Braking System –	Visual	The surface of the friction plate should be free of	Replace.
Friction Disc		scars, gouges, and wear. Refer to Figure 5-2 (36).
Braking System –	Visual, Measure	The surface of the friction plate should be free of	Replace.
Friction Plate		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.
Braking System –	Measure	The bushing should have uniform thickness. The “t”	Replace.
Bushing		dimension should not be less than the discard value
		listed in Table 5-10.
Braking System –	Visual	When slightly heated, the bushing should be so	Soak bushing in
Bushing		lubricated that lubricant oozes off the surface. Refer	machine oil for one
		to Figure 5-2 (39). Type of oil to be used: ISO	day.
		VG68 or equivalent.
Braking System –	Measure	The “D” dimension should not be less than the	Replace.
Ratchet Disc		discard value listed in Table 5-11.
		Refer to Figure 5-2 (38).
Load Sheave	Visual	Pockets of Load Sheave should be clean and free	Replace.
		of significant wear. Refer to Figure 5-3 (14).
Load Gear	Visual	Teeth have excessive wear or damage. Refer to	Replace.
		Figure 5-4 (25).
Hand Wheel	Visual	Large wear or deformation on the surface of hand	Replace.
		wheel. The hand wheel touches the cover.
Frame and	Visual, Auditory,	Hoist components including load blocks,	Replace.
Mechanical	Function	suspension frame, chain attachments, clevises,
Components		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.
Chain Guide	Visual	Excessive wear or press mark.	Replace.
Bolts, Nuts and	Visual, Check	Bolts, nuts, and rivets should not be loose,	Tighten or replace
Rivets	with Proper Tool	deformed, or corroded.	as required.
Warning Labels	Visual	Warning Labels should be affixed to the hoist (see	Replace.
		Section 1.2) and they should be legible.
Hoist Capacity Label	Visual	The label that indicates the capacity of the hoist	Replace.
		should be legible and securely attached to the hoist.
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