Harrington Hoists and Cranes ED-DA Hoist - (ED3) - Manual (Page 14)

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Figure 3-2 Chain Component Arrangement for Hoists with Upper Limit Switch Only
3.3 Load Chain Lubrication
3.3.1 Always lubricate load chain weekly, or more frequently, depending on severity of service.
3.3.2

Always make sure to apply ISO VG 46 or 48 or equivalent machine oil. Insufficient
oil lubrication will accelerate Load Chain wear.