A-19
A-19
TX / TXH / TXB 180S - 400L (4/07)
TX / TXH / TXB 180S - 400L (4/07)
After the chain
After the chain
is inspected and
is inspected and
found to be
found to be
serviceable, relubricate and
serviceable, relubricate and
place back in
place back in
service.
service.
Utilize proper safety precautions when blocking.
Utilize proper safety precautions when blocking.
At 2,000 hours
At 2,000 hours
, disassemble the leaf chain from the vehicle in accordance with the shop service
, disassemble the leaf chain from the vehicle in accordance with the shop service
manual (page 27A-1).
manual (page 27A-1).
Thoroughly clean the chain and visually inspect
Thoroughly clean the chain and visually inspect
for possible failure modes
for possible failure modes
as listed for the 500 hour interv
as listed for the 500 hour interv
al adding to that procedure the following.
al adding to that procedure the following.
Articulate each joint of the
Articulate each joint of the
chain in both directions where the entire radius around each pin can be inspected for cracks.
chain in both directions where the entire radius around each pin can be inspected for cracks.
Particular attention should be given to that length of chain which passes over the rollers.
Particular attention should be given to that length of chain which passes over the rollers.
If the 2,000 hour inspection does not reveal any apparent excess wear or chain damage, relubricate
If the 2,000 hour inspection does not reveal any apparent excess wear or chain damage, relubricate
and install the chain in its original position on the machine.
and install the chain in its original position on the machine.
At each 500
At each 500
hours after the
hours after the
leaf chain is
leaf chain is
reinstalled, inspect and relubricate
reinstalled, inspect and relubricate
and follow the
and follow the
same pro-
same pro-
cedure as on a new machine.
cedure as on a new machine.
At 4,000 operating hours remove and discard the leaf chain and replace with a new and lubri-
At 4,000 operating hours remove and discard the leaf chain and replace with a new and lubri-
cated chain.
cated chain.
Taylor’s recommendation to replace the chain at 4,000 hours is based on typical service duty cycles.
Taylor’s recommendation to replace the chain at 4,000 hours is based on typical service duty cycles.
Experience in a specific application may allow this interval to be increased or may require that it be
Experience in a specific application may allow this interval to be increased or may require that it be
decreased. Any change should be based on thorough inspection procedures outlined in this manual.
decreased. Any change should be based on thorough inspection procedures outlined in this manual.
Modes of Chain Failure — See Illustrations on the following two pages
Modes of Chain Failure — See Illustrations on the following two pages
1). Normal Wear – Chain Elongation.
1). Normal Wear – Chain Elongation.
This is the result of wear when the load chain articu-
This is the result of wear when the load chain articu-
lates over t
lates over t
he chain rollers.
he chain rollers.
See illustration N
See illustration N
o. 1 for
o. 1 for
explanation of
explanation of
wear limits.
wear limits.
When a
When a
theoretical length of 12-in. (305 mm) new chain has elongated from wear to a length of
theoretical length of 12-in. (305 mm) new chain has elongated from wear to a length of
12.360-in. (314 mm) [3%],
12.360-in. (314 mm) [3%],
it has exceeded the allowable
it has exceeded the allowable
wear limit.
wear limit.
The wear should be
The wear should be
measured in the area that pas
measured in the area that pas
ses over the roller most
ses over the roller most
often.
often.
If the length in t
If the length in t
he articulat-
he articulat-
ing section exceeds allowable wear limits (see text),
ing section exceeds allowable wear limits (see text),
replace entire length of both
replace entire length of both
chains.
chains.
2). Chain Stretch.
2). Chain Stretch.
This can
This can
be caused
be caused
by a
by a
combination of
combination of
chain wear
chain wear
and overload.
and overload.
This
This
(overload) can show
(overload) can show
up as elongation
up as elongation
of plates
of plates
which do not
which do not
pass over the
pass over the
rollers.
rollers.
If
If
there is any significant (1%) elongation in the area which does not pass over the rollers,
there is any significant (1%) elongation in the area which does not pass over the rollers,
replace the entire length of both c
replace the entire length of both c
hains.
hains.
Cracked chain plates (illustration
Cracked chain plates (illustration
no. 3) and
no. 3) and
enlarged holes (illustration no. 7) can
enlarged holes (illustration no. 7) can
also result from chain s
also result from chain s
tretch.
tretch.
The entire length of
The entire length of
both chains must be replaced if either of these conditions are found.
both chains must be replaced if either of these conditions are found.
3). Plate / Pin Rotation and / or Plate / Pin Lateral Movement.
3). Plate / Pin Rotation and / or Plate / Pin Lateral Movement.
This
This
is
is
generally c
generally c
aused
aused
by the plate seizing the pin at articulation which indicates
by the plate seizing the pin at articulation which indicates
lack of lubrication
lack of lubrication
where the
where the
joint rotates over the
joint rotates over the
roller.
roller.
(See illustration No. 2.)
(See illustration No. 2.)
This can result in pin
This can result in pin
breakage in
breakage in
extreme cases.
extreme cases.
If any ev
If any ev
idence of pin rot
idence of pin rot
ation is noted,
ation is noted,
replace entire length of both
replace entire length of both
chains.
chains.
4). Plate / Pin Cracks.
4). Plate / Pin Cracks.
Cracks result
Cracks result
from fatigue, s
from fatigue, s
tress corrosion,
tress corrosion,
corrosion fatigue. (See
corrosion fatigue. (See
illustrations No. 3, 4, and 5.)
illustrations No. 3, 4, and 5.)
If any cracks are observed of any
If any cracks are observed of any
kind on any link,
kind on any link,
replace
replace
entire length of chain.
entire length of chain.
5). Chain Joint Stiffness.
5). Chain Joint Stiffness.
(See illustration No. 6.)
(See illustration No. 6.)
Lack of lubrication.
Lack of lubrication.
Check the chain for
Check the chain for
other modes of failure.
other modes of failure.
If none are observed, lubricate thoroughly
If none are observed, lubricate thoroughly
and place back in ser-
and place back in ser-
vice.
vice.
If stif
If stif
fness remains, the c
fness remains, the c
hain may have been damaged and require replacem
hain may have been damaged and require replacem
ent.
ent.
6). Edge Wear of Plates.
6). Edge Wear of Plates.
(See illustration No.
(See illustration No.
8.)
8.)
Edge wear can
Edge wear can
occur at ext
occur at ext
ended hours
ended hours
of service and if
of service and if
sliding of chain occurs
sliding of chain occurs
because of chain roller
because of chain roller
bearing problems.
bearing problems.
If wear
If wear
exceeds 5% of plate height of unused plate,
exceeds 5% of plate height of unused plate,
replace entire length of chain.
replace entire length of chain.
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