Harrington Hoists and Cranes SNER Hoist - Manual (Page 27)

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Table 5-6 Motor Brake Wear Dimensions
NOTICE
Brake must be properly adjusted before measuring "A". See Section 6.3
Capacity Code
"A" Dimension - inch (mm)
Standard Discard
003S, 005L 0.67 (17) 0.61 (15.5)
005S, 010L 0.85 (21.5) 0.79 (20)
010S, 020L, 030C 0.89 (22.5) 0.83 (21)