Owner's Manual for Thern TSSBW Series Spur Gear Hand Winches
page 7
A10191-0309
2.1
General Theory of Operation
2.1.1
THE PULL REQUIRED to move the load must not exceed the load rating of
the winch. Consider the total force required to move the load, not the weight
of the load.
2.1.2
THIS EQUIPMENT CAN develop forces that will exceed the load rat ing.
It is the responsibility of the equipment user to limit the size of the load.
In spect the equipment regularly for damage according to the instructions
contained in this manual.
2.1.3
USE A DISC BRAKE on all hand winches used to lift loads or pull loads on
an incline.
2.1.4
PERFORMANCE RATINGS of the equipment are affected by the amount of
wire rope wound on the drum, the way in which it is wound, and the way the
winch is used.
a
DRUM CAPACITY depends on how tightly and evenly the wire rope is
wound on the drum and diameter of wire rope used. Actual drum capacities
are usually 25-30% less than val ues shown in performance tables, due to
loose winding and overlapping.
b
FORCE REQUIRED TO LIFT the load increases with each additional layer
of wire rope wound onto the drum. The value shown in per for mance tables is
based on an empty drum and maximum handle length.
c
LOAD RATING represents the maximum pull that can be placed on new
equip ment. Load ratings are assigned values for specifi c amounts of load
travel or wire rope accumulation. The load rating de creas es as layers of wire
rope accumulate on the drum.
2.1.5
DUTY RATINGS refer to the type of use the equipment is subject to. Con-
sid er the following when determining duty rating.
a
ENVIRONMENT: harsh environments include hot, cold, dirty, wet, cor-
ro sive, or explosive surroundings.
Protect the equipment from harsh en vi -
ron ments when possible.
b
MAINTENANCE: poor maintenance, meaning poor cleaning, lu bri ca tion,
or inspection, leads to poor operation and possible damage of the equip ment.
Minimize poor maintenance by carefully following the in struc tions con-
tained in this manual.
c
LOADING: severe loading includes shock loading and moving loads that
ex ceed the load rating of the equipment.
Avoid shock loads, and do not
exceed the load rating of the equipment.
d
FREQUENCY OF OPERATION: frequent or lengthy operations in crease
wear and shorten the life span of gears, bearings, and other components.
Increase maintenance of the equipment if used in frequent operations.
CONTACT THE FACTORY FOR MORE INFORMATION.
Important!
• Limit nonuniform winding by
keeping tension on the wire rope
and by maintaining the proper
fl eet angle.
• It is your responsibility to detect
and account for different fac-
tors affecting the condition and
per for mance of the equipment.
