A-19A-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 hoursAt 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 inspectThoroughly clean the chain and visually inspect for possible failure modesfor possible failure modes
as listed for the 500 hour intervas listed for the 500 hour interval adding to that procedure the following. al adding to that procedure the following. Articulate each joint of theArticulate 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, relubricateIf 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 beExperience 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 pagesModes 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 tlates over the chain rollers. he chain rollers. See illustration NSee illustration No. 1 for o. 1 for explanation of explanation of wear limits. wear limits. When aWhen a
theoretical length of 12-in. (305 mm) new chain has elongated from wear to a length oftheoretical 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 beThe wear should be
measured in the area that pasmeasured in the area that passes over the roller most ses over the roller most often. often. If the length in tIf the length in the articulat-he articulat-
ing section exceeds allowable wear limits (see text),ing section exceeds allowable wear limits (see text), replace entire length of bothreplace 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. ThisThis
(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. IfIf
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 creplace the entire length of both chains. hains. Cracked chain plates (illustration Cracked chain plates (illustration no. 3) andno. 3) and
enlarged holes (illustration no. 7) can enlarged holes (illustration no. 7) can also result from chain salso result from chain stretch. tretch. The entire length ofThe 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 cgenerally causedaused
by the plate seizing the pin at articulation which indicatesby the plate seizing the pin at articulation which indicates lack of lubricationlack of lubricationwhere thewhere 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 inbreakage in
extreme cases. extreme cases. If any evIf any evidence of pin rotidence of pin rotation is noted,ation is noted, replace entire length of bothreplace entire length of both
chains.chains.
4). Plate / Pin Cracks.4). Plate / Pin Cracks. Cracks result Cracks result from fatigue, sfrom fatigue, stress corrosion, tress corrosion, corrosion fatigue. (Seecorrosion 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, replacereplace
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 forCheck 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 stifIf stiffness remains, the cfness remains, the chain may have been damaged and require replacemhain may have been damaged and require replacement.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 extoccur at extended hoursended 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 wearIf 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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