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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 Manual Purpose
Greenlee Hook Sheaves Description
Explains the function and application of Greenlee Hook Sheaves in cable installation.
Purpose of the Instruction Manual
States the manual's intent to familiarize personnel with safe operation and maintenance.
Important Safety Information
Safety Alert Symbol and Signal Word Definitions
Defines the meanings of safety symbols (DANGER, WARNING, CAUTION) and alert symbols.
General and Load Capacity Safety Warnings
Covers essential safety precautions, including reading manuals, eye protection, and load capacity.
Cable Compatibility and Bending Radius Caution
Advises consulting cable specifications for minimum bending radius to prevent cable damage.
Hook Load Mechanics and Calculation
Understanding Sheave Forces and Hook Load
Explains resultant force (R) based on tension (T) and angle (θ) with a reference table.
Illustrated Hook Load Scenarios
Provides visual examples of hook loads relative to pulling force at different rope angles.
Hook Load Calculation Formulas
Presents formulas for calculating hook load for one and two attachment points.
Component Specifics and Parts Identification
Hoist Hook Safety and Inspection Guidelines
Covers safety, inspection, and repair guidelines for hoist hooks.
Hook Latch Kit Installation Procedures
Step-by-step instructions for assembling the hook latch kit onto hooks.
Parts List and Specifications for Models 639-653
Detailed illustrations and parts list with specifications for specific hook sheave models.
Parts List and Specifications for Models 8012-8024
Detailed illustrations and parts list with specifications for specific hook sheave models.

Table of Contents