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Double Line (fall) Hoists, Method 1
WARNING
•
The replacement chain for a series MLK double line hoist must have an EVEN
number of links.
1. Install the chain through the chain wheel as in steps 1 through 4 of the
instructions for single line Hoist, and attach the end of the chain to the Hoist
using the anchor bolt and fasteners. Keep the chain straight.
2. Make certain the chain is straight and feed the end through the bottom hook
pocket wheel with the first link ON EDGE WITH THE WELD TO THE INSIDE OF THE
IDLER SHEAVE WHEEL.
3. Keep the chain straight and attach the free end to the chain anchor bracket.
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Capsized Hook
Make certain
bottom block
has NOT been
flipped through
the chain falls
A
(Dwg. MHP0043)
A
Appearance of
Chain Not Twisted
Appearance of
Chain Twisted
B
(Dwg. MHP0020)
A. Appearance of Chain Not Twisted; B. Appearance of Chain Twisted.
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Single or Double Line (fall) Hoists, Method 2
1. On ML250K and ML500K single line Hoists, disconnect the load end of the chain
from the bottom hook block. On ML500KR and ML1000K double line Hoists,
disconnect the load end of the chain from the chain anchor bracket and
withdraw it from the bottom hook sheave block. Do not remove the chain from
the Hoist.
2. Using an abrasive wheel, cut a section from the last standing link as shown in
Dwg. MHP0471.
CAUTION
•
Do not distort the link in any manner. It must be able to pass over the chain
wheel without binding. The last complete link of old chain must be a flat
link unless two cut links are used to make the first link of the new chain a
flat link.
A
B
‘C’ Link
‘A’ Dimension
(Dwg. MHP0817)
Chain
Wheel
Chain Weld
To Outside On
Powered Chain
Wheels
Standing
Link
Load Chain
A
D
B
C
(Dwg. MHP0472)
3. Connect old chain by hooking the end of the new chain onto the cutaway link.
Make certain the welds on the standing links (links that are perpendicular to the
chain wheel) face away from the powered chain wheel.
4. Slowly run the Hoist in the raise direction, running off the old chain and reeving
the new chain over the chain wheel. The first link of new chain over the chain
wheel must be a flat link.
5. After the new chain is installed, secure the unloaded end of the chain to the side
of the Hoist. Make certain there is no twist in the unloaded end of the chain
between the chain wheel and the end link.
WARNING
•
A twisted chain can jam as it passes over the chain wheel, which can result
in damage to the Hoist or even breaking the chain causing severe injury,
death or substantial property damage.
6. On single line Hoists, install the stop ring (115) and spring (114) and then attach
the bottom hook block assembly.
7. On double line Hoists, reeve the load end of the new chain around the pocket
wheel in the sheave block assembly, making certain the chain is not twisted
between the hoist and sheave block.
NOTICE
•
The new chain must have an EVEN number of links when the hoist has two
chain falls and uses a bottom sheave block.
8. Keeping the load end of the chain straight, attach the end link to the chain anchor
bracket.
9. Lubricate the chain as instructed in the “LUBRICATION” section.
10. Run the hook up and down several times under power with no load to make
certain the chain is running smoothly over the chain wheel. There must be no
apparent binding or evidence of malfunctioning.
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Servicing the Filter and Strainer
1. Disconnect the air supply from the Hoist.
2. Unscrew the air hose from the inlet strainer (42) .
3. Unscrew the inlet strainer from the inlet body (38).
4. Wash the screen inside the inlet strainer clean with a quality, non-toxic, non-
flammable commercial solvent in a well ventilated area. If the screen is damaged
or cannot be cleaned, replace the inlet strainer.
5. Unscrew the inlet nipple (39) from the valve chest and remove the inlet nipple
and inlet body from the valve chest.
6. Push the inlet nipple out of the inlet body.
7. Remove the two swivel inlet seals (40) from the inlet nipple.
8. If the swivel inlet gasket (41) is damaged, replace it.
9. Moisten the new swivel inlet seals with O-ring lubricant and install them in the
grooves around the body of the inlet nipple.
10. Push the inlet nipple into the inlet body until the hex of the nipple is flush against
the face of the inlet body.
11. Keep the threaded hole of the inlet body facing away from the Hoist and screw
the inlet nipple into the valve chest.
12. Screw the inlet strainer into the inlet body.
13. Screw the air hose into the inlet strainer.
14. Reconnect the air supply to the Hoist.
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Disassembly
WARNING
•
Disconnect the air supply hose before performing any maintenance or
repairs on this Hoist.
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General Instructions
1. The MLK Hoist is constructed of various modules, and during the process of
disassembly it is not always necessary to disassemble a particular module just
because it is removed from the Hoist. For example, it is necessary to remove the
valve chest assembly in order to disassemble the motor. However, the valve
chest need not be disassembled unless parts within the valve chest require
replacement. Do not disassemble the Hoist any further than necessary to replace
or repair damaged parts.
2. Whenever grasping a part in a vise, always use leather-covered or copper-
covered vise jaws to protect the surface of the part and help prevent distortion.
This is particularly true of threaded members and housings.
3. Do not remove any part which is a press fit in or on a sub-assembly unless the
removal of that part is necessary to complete the repair or replacement of the
part.
Form 47099007 Edition 3
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