9.1 General
9.1 General
The hoist system is of the two—stage,rolling telescopic mast type.The inner mast
The hoist system is of the two—stage,rolling telescopic mast type.The inner mast
frames have J—shaped section.The outer mast frames have J—shaped section of 10 ton
frames have J—shaped section.The outer mast frames have J—shaped section of 10 ton
forklift trucks and have C—shaped section of 5 to 8 ton forklift trucks.The masts of 5 to 10
forklift trucks and have C—shaped section of 5 to 8 ton forklift trucks.The masts of 5 to 10
ton forklift trucks all contai
ton forklift trucks all contai
n a
n a
free lift range.
free lift range.
9.2 Outer & inner mast
9.2 Outer & inner mast
The mast assembly is of the free lift range—contained two stage telescopic type
The mast assembly is of the free lift range—contained two stage telescopic type
consisti
consisti
ng of the inner and
ng of the inner and
outer mast,an
outer mast,an
d is
d is
sustaine
sustaine
d by mast
d by mast
supports.
supports.
The mast supports
The mast supports
are welded to the bottom of the outer mast,being extended from the axle housing.The outer
are welded to the bottom of the outer mast,being extended from the axle housing.The outer
masts are provided with brackets for lock pins of tilt cylinder connecting hardware.The
masts are provided with brackets for lock pins of tilt cylinder connecting hardware.The
mast
mast
is
is
tilted
tilted
by
by
operation
operation
of
of
the
the
tilt
tilt
cylinders,forward
cylinders,forward
6
6
and
and
backward
backward
12
12
.
.
The inner mast is composed of right and left mast frames which are connected with
The inner mast is composed of right and left mast frames which are connected with
each other by upper and lower connecting members.At the upper inside of each outer mast
each other by upper and lower connecting members.At the upper inside of each outer mast
frame an end
frame an end
roller is installe
roller is installe
d on
d on
the end roller shaft welded to
the end roller shaft welded to
the frame,w
the frame,w
ith a
ith a
snap
snap
ring.In addition,the outer mast frames are fitted with
ring.In addition,the outer mast frames are fitted with
side rollers to sustain the inner mast
side rollers to sustain the inner mast
frames.At the lower outside of each inner mast frame an end roller is installed on the end
frames.At the lower outside of each inner mast frame an end roller is installed on the end
roller shaft with snap ring,which is welded to the inner mast.Under the end rollers other
roller shaft with snap ring,which is welded to the inner mast.Under the end rollers other
side rollers are located to sustain transverse load.With the aid of these rollers,the inner
side rollers are located to sustain transverse load.With the aid of these rollers,the inner
mast can smoothly operates.
mast can smoothly operates.
9.3 Lift bracket
9.3 Lift bracket
At the lift brackets,end rolers that roll along the inside of he inner mast frames are
At the lift brackets,end rolers that roll along the inside of he inner mast frames are
installed on the end roller shafts with snap rings.The end roller shafts are welded to the lift
installed on the end roller shafts with snap rings.The end roller shafts are welded to the lift
brack
brack
ets.T
ets.T
he side rollers that
he side rollers that
roll along on
roll along on
the inside of
the inside of
the inner mast frames are
the inner mast frames are
bolt
bolt
fitted,being shim adjusted.To prevent the tolling of the finger bar,two retaining rollers are
fitted,being shim adjusted.To prevent the tolling of the finger bar,two retaining rollers are
used,which roll along on the outside of inner mast frames.The lingitudinal load is
used,which roll along on the outside of inner mast frames.The lingitudinal load is
sustained by the end rollers of which the upper ones emerge from the mast top when the
sustained by the end rollers of which the upper ones emerge from the mast top when the
forks reaches the maximum lift
forks reaches the maximum lift
height.The transverse load is sustained by upper retaining
height.The transverse load is sustained by upper retaining
rollers and lower side rollers.As we
rollers and lower side rollers.As we
mentioned above,the mast assembly and lift
mentioned above,the mast assembly and lift
brackets
brackets
are designed with rigidity,stability and smooth operation in
are designed with rigidity,stability and smooth operation in
mind.Furthermore,the finger
mind.Furthermore,the finger
bar and lift brackets are made into one body construction using high tension steel to
bar and lift brackets are made into one body construction using high tension steel to
improve the durability.This meets the ISO Standards.
improve the durability.This meets the ISO Standards.
The two forks install
The two forks install
ed on
ed on
the finger bar are made of
the finger bar are made of
spec
spec
ial alloy steel which has
ial alloy steel which has
been subjected to heat treatment.
been subjected to heat treatment.
9.4 Adjustment of hoist system
9.4 Adjustment of hoist system
9.4.1 Adjustment of lift cylinder
9.4.1 Adjustment of lift cylinder
When replace the lift cylinder,inner mast or outer mast,we shall readjust the stroke of
When replace the lift cylinder,inner mast or outer mast,we shall readjust the stroke of
the lift cylinder as following.
the lift cylinder as following.
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