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INSTRUCTION MANUAL
Hook Sheaves
639, 650, 651, 652, and 653
8012, 8018, and 8024
Read and understand all of the instructions and
safety information in this manual before operating
or servicing this tool.
Register this product at www.greenlee.com
52056646 REV 3
© 2019 Greenlee Tools, Inc.
9/19

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Summarization of Contents

Product Description and Purpose
Description
Explains the function and application of Greenlee Hook Sheaves.
Purpose of this Manual
To familiarize personnel with safe operation and maintenance of specific Greenlee tools.
Important Safety Information
Safety Alert Symbols and General Warnings
Explains safety symbols, signal words, and provides general warnings for safe operation.
Cautionary Notes
Cautions regarding cable bending radius and sheave size to prevent damage.
Hook Load Analysis
Sheave Forces and Definitions
Defines resultant force (R), angle of change (θ), and tension (T) in sheave operations.
Illustrated Hook Load Scenarios
Illustrates various hook load scenarios based on rope angles and pulling force.
Calculating Hook Load (One Attachment Point)
Provides Formula 1 to calculate hook load at a single attachment point.
Calculating Hook Load (Two Attachment Points)
Provides Formulas 2 and 3 for calculating hook loads at two attachment points.
Hoist Hook Usage and Safety
Hoist Hook Warnings and Instructions
Provides critical safety warnings and operational guidelines for using hoist hooks.
Hook Inspection and Repair Limits
Details zones for hook inspection and limits for repair based on wear.
Hook Latch Kit
Latch Kit Warnings and Application
Details safety warnings and application guidelines for the hook latch kit.
Latch Assembly Instructions
Provides step-by-step instructions for assembling the latch onto hooks.

Table of Contents