5. Cut new load chain to length. Load chain must have an odd number of links (first
and last links must be in same plane/parallel to each other). Refer to Dwg.
6. Remove capscrew and cotter pin that anchor load chain to bottom block
assembly.
7. Using a ‘C’ link which is same size as load chain, join new load chain to free end
on old chain taking care that weld on perpendicular standing links on new chain
are facing away from hoist load sheave.
8. Run hoist slowly until new load chain has passed through hoist. Continue
running hoist and pull chain by hand through bottom block assembly. Begin
feeding chain at position ‘A’ and work alphabetically. Remove ‘C’ link and old
chain.
9. Attach end of load chain to bottom block assembly. Install chain stopper in last
link of load chain free end.
10. Lubricate entire length of load chain before operating hoist. Refer to
“LUBRICATION” section in Product Information Manual.
HA3-075 Chain Reeving
75 Ton
Hoist
Only
Chain
Weld
Chain
Weld
located
on back
side
Feed first link
flat to load
sheave
Weld on flat
chain links
must face
away from
hoist motor
side
Bottom
Block
Hoist Motor
Side
Power Head
Idle Sheave
Power Head
Load Sheave
Chain
Stopper
Anchor chain
at this point
A
D
B
C
Weld on
perpendicular
chain links
must face
away from
sheaves
A
B
C
E
D
F
G
H
J
K
L
M
(Dwg. MHP2340)
n
HA3-100 Hoist
Refer to Dwg. MHP2341 on page 7, A. Feed first link perpendicular; B. Anchor
chain at this point; C. Chain Stopper; D. Weld; E. Power Head Load Sheave; F. Idle
Sheave; G. Hoist Motor Side; H. Bottom Block; J. Weld on perpendicular chain links
must face away from sheaves. Weld on flat chain links must face away from hoist
motor side.
1. The hoist must be installed and connected to air supply. Reduce hoist air pressure
to 60 psi (4 bar/414 kPa).
2. Remove chain bucket, if used.
3. Remove chain stopper.
4. Run hoist slowly in lifting direction until bottom block assembly is approximately
3 ft. (1 m) from hoist power head. Firmly support and secure bottom block
assembly in this position.
WARNING
•
Do not begin chain replacement until bottom block assembly is fully
secured and supported. If bottom block assembly or chain are dropped,
they could cause injury or damage property.
5. Cut new load chain to length. Load chain must have an even number of links
(first and last links must be at 90˚ to each other). Refer to Dwg. MHP2336
6. Remove pins that anchor load chain to power head assembly.
7. Using a ‘C’ link which is the same size as load chain join new load chain to free
end on old load chain taking care that weld on perpendicular standing links on
new load chain are facing away from hoist load sheave.
8. Run hoist slowly until the new load chain has passed through hoist. Continue
running hoist and pull chain through bottom block assembly. Begin feeding
chain at position ‘A’ and work alphabetically. Remove ‘C’ link and old chain.
9. Anchor end of load chain to power head assembly. Install chain stopper in last
link of load chain free end.
10. Lubricate entire length of load chain before operating hoist. Refer to
“LUBRICATION” section.
HA3-100 Chain Reeving
Weld on perpendicular
chain links must face
away from sheaves
Weld on flat chain links
must face away from
hoist motor side
Bottom
Block
Hoist Motor
Side
Idle Sheave
Power Head
Load Sheave
Weld
Feed first link
perpendicular
to load sheave
Anchor chain
at this point
Chain
Stopper
A
B
C
D
E
A
B
C
E
D
F
G
H
J
(Dwg. MHP2341)
n
General Disassembly
The following instructions provide the necessary information to disassemble,
inspect, repair, and assemble the hoist. Complete assembly drawings of the hoist
components are provided in Product Parts Information Manual.
If hoist is being completely disassembled for any reason, follow the order of the
topics as they are presented. It is recommended that all maintenance work on hoist
be performed on a bench in a clean dust-free work area.
In the process of disassembling hoist, observe the following:
1. Turn off air system and depressurize air lines before performing any
maintenance. Disconnect hoses from hoist and trolley. Plug or cap openings to
keep out dirt and contaminants.
2. Never disassemble hoist any further than is necessary to accomplish the needed
repair. A good part can be damaged during the course of disassembly.
3. Never use excessive force when removing parts. Tapping gently around the
perimeter of a cover or housing with a soft hammer, for example, is sufficient to
break the seal.
4. Do not heat a part with a flame to free it for removal, unless the part being heated
is already worn or damaged beyond repair and no additional damage will occur
to other parts.
5. In general, hoist is designed to permit easy disassembly and assembly. The use
of heat or excessive force should not be required.
Form MHD56243 Edition 4
7
