8
9
Operational cause Note
Overhead crane & hoists are typically designed to lift objects vertically. The specific guide lines are
mentioned in respective IS standard .
Sometimes, however, operators attempt to make a side pull or cross pull or use the hoist
horizontally to lift an object that is not directly underneath it.
This can cause damage to hoist.
Probable failures/Risks:
Side pulling can cause damage to various hoist parts – Load Chain Wheel, Chain Guide
Roller, Chain Stripper, Hook and hook latch assembly, in electric Chain Hoists the load
chain guide and chain stripper ad in Wire Rope Hoists the rope drum, rope guide and the
rope itself.
Additionally, it may place the operator and personnel working near the crane at risk for
injury.
One of the main risks for an operator is load swing, which can damage the load or cause
injury to the operator. In extreme cases, there might be a load drop.
A rope that has been worn by side pulls may also snap and lead to a loss in control of the
load.
Cross pull or side pull may affect on monorail beam flanges, the beam web may deflect /
distort, and beam flanges may wear causing uneven sides of beam.
Preventing side pulls could lead to increases in both the safety and the lifetime of the
components, customer should be educated at every interaction opportunity.
The unfortunate prevalence of cross pulling-related accidents and maintenance needs
repeated replacement of parts like chain guider roller, chain stripper, hook latch assembly,
rope guide related parts i.e set of rope guide ring, spring and rope guide joining bracket.
Operational Note:
Please be aware that as a safety feature, this rope guide ring is designed to snap in the event
of the wrong usage of the rope hoist. As per IS 3938-2005 the angular lifting / pulling of dead
weight is not allowed in wire rope hoist. If any user puts the rope hoist to such an application,
the rope guide ring will not allow to perform the lifting. The rope guide ring will break if the
fleet angle is more than 5 Deg. including angle between point of lift and dead weight kept on
floor.
The specific instruction in Do’s and Don’ts is given hoist operating and maintenance manual.
Those guidelines are based on past experience and safety standards of operation.
The hoist in tandem application cannot be used because the load lifting speed and effort are
not balanced in manual hoisting operation. Most important is load required to be cantered
under hoist and load line of trolley centre and hook seating diameter centre should match. The
hoists are designed for lifting load vertically. This phenomenon is applicable for all hoisting
equipment’s.
If hoist not used in proper way as mentioned above the warranty claims will not be accepted.
Indicative list of parts not covered under warranty.
Hercules Hoists Limited ©2020
Note :- Due to continuous development and improvement specification listed above may be changed without notice
Indef CHAIN ELECTRIC HOIST
Hercules Hoists Limited ©2020
Note :- Due to continuous development and improvement specification listed above may be changed without notice
Indicative list of parts not covered under warranty:
1
Hoist Motor Winding
2
Load Chain
3
Safety Latch assembly
4
Brake Disc – Hoist and Trolley
5
Brake Coil – Hoist and Trolley
6
Hoist and Cross Travel Limit Switch
7
Trolley Motor Winding
8
Pendent control
9
Relay and Fuse
10
Chain Guide
11
Chain Stripper
12
VFD / Inverter
13
Special Control Switch Gear
14
Control Transformer
This can cause damage to hoist
Hercules Hoists Limited ©2020
Note :- Due to continuous development and improvement specification listed above may be changed without notice
Hercules Hoists Limited ©2020
Note :- Due to continuous development and improvement specification listed above may be changed without notice
Indef CHAIN ELECTRIC HOIST
