Product Manual

12
The load chain supplied with
your JET chain hoist is designed,
manufactured, and tested for proper fit and
durability. Over a period of time, the chain may
need to be replaced. For your own safety, use
factory replacement chain only. Use of other
than factory replacement chain may cause
serious injury and/or damage to hoist.
A light coat of 30W oil applied periodically to the
chain will create easier operation and prolong
chain life.
12.2 Inspecting hooks
It is important to check top and bottom hooks for
proper opening and other signs of deformation or
damage. Replace a hook immediately if any of the
following problems are identified:
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 7).
Figure 7
3. Chemical corrosion or cracks on the hook.
4. Excessive wear on the inside surface.
5. The throat opening has enlarged. (See section
17.1 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.
13.0 Operation
13.1 Controls
Refer to Figure 8.
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 8
To lift a load, press and hold the UP button. To
lower, press and hold the DOWN button. The
speed dial may be rotated at any time while
pressing one of the other buttons. Use low speed
when beginning to lift a load, or when settling a
load at the drop point.
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.
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.
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 9.