Instructions / Assembly

12
1. The safety latch is damaged or bent, or no
longer has sufficient spring pressure to contact
the hook tip.
2. The vertical angle at neck of the hook reaches
10 (see Figure 11-3).
Figure 11-3
3. Chemical corrosion or cracks on the hook.
4. Excessive wear on the inside surface.
5. The throat opening has enlarged. (See sect.
16.1 for maximum allowable limits for the throat
opening.)
NOTE: Excessive hook throat opening or twist
indicates abuse or overloading of the hoist. If such
deformation is discovered, inspect hoist, chain and
all supporting members very carefully for additional
indications of excessive hoist loading.
Do not attempt repair of a hook
by heat treating, bending or attaching anything
by welding. Such procedures will weaken and
may cause failure of the hook.
12.0 Operation
Read all safety instructions in sect. 1.0 before
operating this hoist.
12.1 Controls
Refer to Figure 12-1.
Allow hoist to come to a full
stop before changing direction. Rapidly
reversing or catching a falling load can overload
the hoist system and cause failure in hoist
and/or chain, resulting in injury or property
damage.
Figure 12-1
To lift a load, press and hold the UP button. To lower,
press and hold the DOWN button. The buttons are
two-step: Lightly press a button for low speed; fully
press for high speed.
Press and hold the button firmly; avoid excessive
inching
Press the red emergency stop button to shut off
power quickly; the button remains locked and
prevents any movement of the hoist. To restart,
rotate stop button clockwise until it disengages.
If hoist is connected to a manual trolley, move hoist
by pushing on the suspended load. Move an
unloaded hoist by pulling on the empty hook. Do
NOT move hoist by pulling on control cord.
The 2-button pendant controls are standard when
hoist is used by itself. The 4-button pendant controls
are for use with the optional JET model MT dual-
speed trolley. The buttons control both vertical lift
and lateral travel, thus allowing one pendant control
to be used for both hoist and trolley. All buttons are
two-step. See chart in sect. 18.0.
Always keep hoist clean, and store in a clean, dry
location.
Avoid lifting one load with two hoists. If this is
unavoidable, apply equal weight to both hoists and
use hoists with proper lift capacity. Capacity of
each hoist must be equal to the total load to be
lifted.
12.2 General procedure
Follow this general procedure for hoisting loads:
1. Secure upper hook to the supporting structure.
2. Place load sling or chain in center of bottom
hook, making sure the safety latch is secure.
Never load the hook in front of the safety
latch. See Figure 12-2.