26
Item Method Discard limit or criteria Action
Braking
mecha-
nism
Measure the abrasion of the
Ratchet Disc with a vernier
caliper.
Replace the Ratchet
Disc.
Visually check Pawl. • The Pawl should not be worn with a step on
the tip.
Replace the Pawl.
Visually check Pawl Spring
Assembly.
• Should be free of deformations, aws,
breaks or poor spring.
Replace Pawl Spring
Assembly.
Visually check corrosion
(rust).
• Each part should be free of excessive
corrosion (rust).
Replace any rusty part.
Measure the abrasion of the
Friction Disc in contact with
the Bushing (as shown in the
following gure with a dotted
line) with a vernier caliper.
Replace Friction Disc.
D
One point
Two-point
D
4mm
Rated load (t)
Dimension D (mm)
Standard Limit
0.25 33.8 32.4
0.5
44.3 42.9
Abrasion
D
Two- point
contact
Two-point
250kg
500kg
Rated load (t)
Dimension D (mm)
Standard Limit
0.25 16.4 15.6
0.5
21.9 21.1
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