Dover TWG Tulsa 18G-SLLRO Service-informatie - Pagina 3
Blader online of download pdf Service-informatie voor {categorie_naam} Dover TWG Tulsa 18G-SLLRO. Dover TWG Tulsa 18G-SLLRO 4 pagina's.
Pagina afdrukken
Operating Characteristics
TULSA winches are worm-gear driven de
signed for heavy loads at slow speeds and
for intermittent duty. Drum capacities for
cable are not excessively large, purposely
to protect the worm and gear in the winch
from prolonged pulls under heavy loads
which might generate enough heat to per
manently damage the worm, gear and
bearings. Due to the fact that most loads
are seldom steady, but are usually jerking
or vibrating, imposing a load on the winch
several times the actual weight being
lifted, the lubricant used in the worm
gear case must be of the highest quality
and it is necessary to have a safety brake.
The worm and gear in Tulsa winches
(except for the special high speed
winches using double thread worm and
gear) are of the low helix angle, low
efficiency type. The low efficiency of the
worm and gear means that a good part
of the energy transmitted in the winch is
converted into heat which must be dis
sipated through the lubricant to the
outside air.
Tulsa Winches are equipped with a reverse
draft clutch, which cannot be disengaged
while the winch is under load. This fea
ture, along with the automatic worm
safety brake, insure that a load must be
lowered under power. When the winch is
not under load, the drum clutch can be
disengaged, permitting the operator to
spool line off the drum by hand, thus
saving wear on the automatic safety brake,
as well as other parts of the winch.
All Tulsa winches are equipped with either
a drum band brake or a drum drag brake
which facilitates spooling line off the drum
by preventing over-running and tangling.
These brakes are applied by a manual
control lever or automatically.
Automatic Worm Brake
Assembly
THE AUTOMATIC WORM BRAKE of Tulsa
winches can be assembled with right hand
or left hand cam settings. The automatic
worm brake is designed to completely re
lease in the forward speed of the worm or
the load lifting direction of the worm, and
automatically brake In the reverse direc
tion of the worm or when a load on the
winch tends to rotate the worm in reverse.
When a load is held suspended by the
automatic brake, a small amount of re
versing power is necessary to lower the
load and therefore, the worm brake should
be tightened only to that amount neces•
sary to suspend the maximum load to be
handled. This will reduce wear to a min
imum on the brake linings and prevent
unnecessary heating in reverse Qr the
load-lowering operation. The direction of
General Information
tightening the worm brake is shown on
the outside of the cam and the "hand" of
the cam should be such that the tighten
ing direction is in the forward rotation of
the worm, or the load-lifting rotation of
the worm, for the automatic brake to op
erate satisfactorily.
The automatic worm brake operates dry
and is cam operated. The cam of the cam
type brake can be set in either of two po
sitions, depending upon the direction of
rotation of the worm shaft in the load
raising direction and the hand of the worm
and gear installed in the winch. The cam
must be installed in the correct position
or the brake will not function.
WHEN SPOOLI N G LOOSE CABLE OFF
THE DRUM, disengage the clutch and pull
cable off manually. This eliminates unnec
essary wear on the worm brake linings.
The worm brake is easily adjusted by
loosening or removing cap screws as nec
essary and turning the cam in the direc
tion of the tightening arrow. All brake
linings wear and it is necessary to adjust
the worm brake from time to time depend
ing on the frequency of its use. It will be
come apparent when the lining is worn -
the brake will begin to slip and will not
hold a load. At this point the brake should
be adjusted, or, if already tight as pos
sible, the brake shoes should be relined
and other worn parts replaced.
BRAKE ADJUSTMENT
INSTRUCTION PLAT E
, ? �
�
�-,,'
Tighten
Brake
RIGHT HAND
CAM SETTING
A DRUM BRAKE ASSEMBLY is furnished
on our winches to retard the speed of the
cable drum when spooling off loose
cable. Use of the brake in "free-spooling"
of the cable drum prevents tangling of
the cable on the drum.
Suggestions and
Precautions
1. "Wear-in Period" - Winches, like other
machinery, should be operated care
fully during the first few hours of oper
ation. Frequent cooling-off periods are
essential to prevent over-heating.
2. Cable Sizes - Never use larger size
cable than is shown on current catalog
literature for the winch model being
used.
3.
Slow Speeds-Intermittent Duty- Op-
eration at slow speeds with intermittent
operation are essential to prolong the
service of worm-gear winches.
4. Shock Loads - Avoid shock loads.
This type of load imposes a strain
on the winch many times the actual
weight of the load.
5.
Engaging Winch Clutch - Always make
certain that winch clutch is either com
pletely engaged or disengaged (as de
sired) to save wear on clutch jaws and
insure safety.
6. Operating Cycle - The operating cycle
consists of:
(a) Disengaging winch drum clutch and
pulling off enough cable to allow
hooking to load. The drum brake
should be used to keep drum from
rolling too fast and thereby entangl
ing cable.
(b} After hooking to load engage drum
clutch and release the drum brake.
(c} Depress engine clutch pedal and
shift power take-off into forward
speed using low speed for heavy
loads.
(d) Release engine clutch pedal and
winch will reel in cable.
(e) The winch is stopped by depressing
engine clutch pedal and the load will
be held by the automatic brake on
the end of the worm shaft.
(f} To lower the load or to remove cable
from load, shift power take-off into
reverse and release engine clutch
pedal. The winch will then unreel
cable.
Always keep in mind the load to be
handled should not exceed safe working
load of the winch. Safe working loads are
figured on the first layer; therefore, for
each layer of cable on the drum, the
load the winch will handle is reduced.
Oil Capacity
Winch
SAE
Model
Capacity
Viscosity
Application
Factory Installed
18G
140
3 Qts.
for Normal Duty