Jet JEH Series Operation Manual page 10

5. Keep tension on both sides of the chain and lower
the load hook to pull the new chain through the hoist.
Do not let the chain twist or bind as it is being pulled
through the hoist.
6. Stop hoist when 1 to 2 feet of the new chain remains
on the slack side.
7. Install the spring and chain stop on the slack end of
the new chain.
8. Remove C-link. Remove the load hook and the spring
from the old chain and install them on the new chain.
Inspect the condition of both spring and hook.
9. Lower load hook until the limit switch stops hoist
movement. Inspect the chain for any signs of twist.
10. Install chain container following the instructions in this
manual. Do not fill chain container by hand.
11. It is recommended that after installing new chain, the
first few lifts be limited to no more than 25-50% of the
rated load. Thoroughly inspect chain for twist before
placing hoist in routine service.
Vertical and Horizontal Links
Vertical and horizontal are determined from the relationship
with the load sprocket. Vertical links will be guided by the
centre slit in the load sprocket. Horizontal links will engage
in the oval pockets on the sprocket. See Figure 15.
Dual Fall Chain Hoists
The link on the load side end must be
a vertical link. If it is a horizontal link, the chain will have
a twist in it.
1. Lower hook until only 1 to 2 feet of slack chain
remains in the chain container.
2. Remove chain container.
3. On the slack side of the chain, remove chain stop,
and remove the spring(s). (See Figure 13). Keep these
handy for later re-installing.
4. Using a C-link(s), connect the new chain to the old
chain. If the end link of the old chain is horizontal, use
two C-links. If the end link of the old chain is vertical,
use one C-link See Figure 15. Using the correct number
of C-links will properly orient the chain and ensure that
the first link on the load-side end is a horizontal link.
5. Install the spring(s) and chain stop on the opposite end
of the new chain.
6. Support the load hook so that the load chain can pass
through the chain sheaves smoothly.
10
7. Press the DOWN button to move the chain through the
hoist. Keep tension on the chain as you pull it through
to the load side until the C-link(s) clears the hoist at the
load side.
8. Feed the new chain through the load hook.
9. Remove the clevis pin from the suspension block (#48,
page 15), and remove old chain.
10. Remove C-link and connect the end of the new chain
to the suspension block, using the clevis pin and a new
cotter pin to secure it. Do not substitute any other pin
or bolt in this application.
NOTE: Be sure that there is no twisting of the chain
between the last chain sprocket in the hoist and the
suspension block.
11. Install chain container following instructions in this
manual. Do not fill the chain container by hand.
12. Lower hook until limit switch stops hoist movement,
then raise hook until limit switch stops hoist movement.
Inspect chain for any signs of twist and correct before
continuing.
13. It is recommended that the first few lifts be limited to no
more than 25–50% of the rated load. Inspect chain for
twist before placing hoist into routine service.
Figure 15