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CM 646 Series - User Manual

CM 646 Series
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83885
Manual No. 646-J
®
CYCLONE
HAND HOIST
AND LOW HEADROOM
TROLLEY HOIST
®
Operating, Maintenance &
Parts Manual
HAND HOIST
Rated Loads
Hand Hoists ¼ through 10 tons.
Low Headroom Trolley Hoists:
½ through 6 tons
Follow all instructions and warnings for
inspecting, maintaining and operating this hoist.
The use of any hoist presents some risk of personal injury
or property damage. That risk is greatly increased if proper
instructions and warnings are not followed. Before using
this hoist, each operator should become thoroughly familiar
with all warnings, instructions, and recommendations in this
manual.
Retain this manual for future reference and use.
Forward this manual to the hoist operator.
Failure to operate the equipment as directed in the manual
may cause injury.
Before using the hoist, fill in the information below. Model and
serial numbers are stamped into the aluminum hoist housing.
Model Number
Serial Number
Purchase Date
For more information contact: Sievert Crane and Hoist, (708) 771-1600, parts@sievertelectric.com, www.sievertcrane.com

Table of Contents

Questions and Answers

  • B
    Bradley AlexanderAug 6, 2025
    What to do if my CM 646 will not operate in the lowering direction?
    • M
      Mia HernandezAug 6, 2025
      If your CM Chain Hoists won't operate when lowering, consider these potential causes: * The brake is locked due to a suddenly applied load, shock load, or load removed by means other than operating the unit in the lowering direction. With the hoist under load and the chain taut, pull sharply on the hand chain in the lowering direction to loosen the brake. * The chain is binding. Refer to items 1A, 1B, and 1C for guidance on resolving chain binding issues. * The lower hook is all the way out, and the load chain is fully extended, making the chain taut between the liftwheel and loose end screw. Operate the unit in the hoisting direction only.
  • E
    Erica AcostaAug 11, 2025
    How to troubleshoot CM 646 Chain Hoists that is hard to operate in the hoisting direction?
    • N
      Nicholas ReidAug 11, 2025
      If your CM Chain Hoists is hard to operate when hoisting, it might be due to: * Chain binding. See Items 1A, 1B, and 1C for solutions. * Chain twisted (3 ton capacity or larger). Rereeve chain on 3 and 4 ton unit, if both chains are twisted, capsize hook block through loop in chain until twists are removed. Caution - do not operate unit in hoisting direction with twisted chain or serious damage will result. * Overload. Reduce load or use correct capacity hoist.
  • P
    Philip GarciaAug 16, 2025
    What to do if my CM 646 will not operate in either direction?
    • Z
      Zachary DavisAug 16, 2025
      If your CM Chain Hoists won't operate in either direction, it could be because: * The liftwheel gear key or friction hub key is missing or sheared. Install or replace the key. * The gears are jammed. Inspect for foreign matter in gear teeth.
  • D
    Dennis PerezAug 21, 2025
    Why is my CM 646 hard to operate in the lowering direction?
    • M
      Matthew CastilloAug 21, 2025
      If your CM Chain Hoists is hard to operate when lowering, consider these possibilities: * Brake parts are corroded or coated with foreign matter. Disassemble the brake and clean thoroughly by wiping with a cloth. Do not wash in a solvent. Replace washers if gummy, visibly worn, or coated with a foreign matter. Keep washers and brake surfaces clean and dry. * Chain binding. See Items 1A, 1B and 1C for solutions.
  • T
    Tyler WhiteOct 26, 2025
    Why is my CM 646 hard to operate in either direction?
    • L
      Lauren RyanOct 27, 2025
      Your CM Chain Hoists might be hard to operate because: * The load chain is worn, causing it to bind between the liftwheel and chain guide. Check the chain's gauge and replace it if excessively worn. * The load chain is rusty, corroded, or clogged. Clean it using a non-acid or non-caustic solvent and lubricate it with Lubriplate®Bar and Chain Oil 10-R or an equivalent lubricant. * The load chain is damaged. Inspect for gouges, nicks, or twisted links and replace if damaged. * The liftwheel is clogged or worn, causing binding. Clean out the pockets and replace if excessively worn. * The hand chain is worn, causing binding. Check the chain's gauge. * The handwheel is clogged or worn. Clean out the pockets and replace if excessively worn. * The liftwheel or gear teeth are deform...
  • S
    Shelly ThompsonOct 31, 2025
    What to do if my CM 646 Chain Hoists will not hold load in suspension?
    • J
      Jade GregoryOct 31, 2025
      If your CM Chain Hoists won't hold a load, it could be due to several reasons: * The lower hook or load side of the chain is on the wrong side of the liftwheel. Ensure the lower hook is on the same side of the liftwheel as the upper hook. * The pawl is not engaging with the ratchet. This could be due to a missing or broken pawl spring, or the pawl binding on the pawl stud. Replace the spring and clean the pawl to ensure free movement and proper engagement with the ratchet. Do not oil. * The ratchet teeth or pawl are worn or broken. Replace the pawl and/or ratchet. * The brake parts are worn. Replace the worn brake parts. * The brake friction surfaces are oily, dirty, or corroded. Disassemble the brake and clean thoroughly by wiping with a cloth. Replace washers if gummy, visibly...

Summary

Safety Precautions

Critical Warnings

Highlights critical safety instructions and warnings for safe hoist operation.

Cautions and Operator Responsibility

Details specific cautions and emphasizes operator's role in ensuring safe hoist use.

General Information and Operation

Specifications Overview

Provides technical data for CM Cyclone Hand Hoists and Trolley Hoists.

Unpacking and Installation

Instructions for unpacking, operating, and installing the hoist and trolley.

Inspection and Maintenance

Inspection Schedule and Procedures

Details on frequent, periodic, and condition-based hoist inspections.

Preventive Maintenance and Lubrication

Recommended maintenance schedule, lubrication, and component care.

Brake System Care

Procedures for inspecting and maintaining the hoist's brake assembly.

Specific Procedures, Troubleshooting, and Parts

Disassembly, Assembly, and Reeving

Instructions for hoist disassembly, assembly, and load chain reeving.

Testing, Chain Management, and Troubleshooting

Hoist testing, chain cutting methods, and solutions for common operational issues.

Parts Listing and Ordering

Comprehensive parts lists for hoists and information on ordering replacements.

CM 646 Series Specifications

General IconGeneral
TypeElectric Chain Hoist
Operating Temperature+40°C
Control TypePendant Control
Voltage230V or 400V
Frequency60 Hz
Protection ClassIP54

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