Component education • No model-specific service specification
Tracked undercarriage research compares a complete wear system. Caterpillar separates machine and application families; a track or roller should not be selected by appearance alone.
Identify the assembly
Track chains, rubber tracks, idlers, sprockets, shoes, rollers are discovery terms. This functional hierarchy is not an OEM bill of materials.
Record these specifications
Record the installed track type, pitch, link count and shoe or belt width from verified documentation.
Identify sprocket, idler, roller and frame variants independently.
For rubber tracks, preserve the complete manufacturer size/designation and guide arrangement.
Buying, inspection and service limits
Ask for measured wear and a system assessment. Mixing a new component with a worn mating system needs manufacturer or qualified undercarriage review.
Track tension, recoil systems and component replacement require the applicable machine procedure. No numerical adjustment or cross-brand fit is established here.
An undercarriage is a wear system with interacting rolling, guiding and driving surfaces. A replacement investigation needs more than track width or the machine's sales name. Separate steel chain/shoe arrangements from rubber-track constructions, then identify the installed frame and running gear so that the track, sprocket, rollers and guiding features can be compared as a documented combination.
Track dimensions do not define every interface
Caterpillar distinguishes several undercarriage designs and identifies chains, rollers, idlers and sprockets as working together [TRACK-STEEL]. Camso's historical track record structure distinguishes width, links and pitch from tread, guiding and metal-piece design [TRACK-RUBBER]. The practical consequence is that matching a short size code is an initial filter, not complete compatibility evidence. Catalogue rows from an older edition also do not prove that a currently offered track remains an approved replacement.
Build a position-specific identification record
HeavyEQ interpretation: record left/right location, track frame identity, track type, complete marking and observed running-gear configuration. For a rubber track, preserve inner guide and drive-lug photographs as well as outer tread views. For a steel assembly, distinguish chain/link identity, shoe arrangement and sprocket or segment identity. Count and measure only under an appropriate safe inspection plan; retain the method and datum. Do not relabel an approximate worn measurement as the manufacturer's nominal new dimension.
Compare wear evidence across the system
A track seller should describe exposed reinforcement, torn lugs, damaged guiding surfaces or other observed condition rather than only remaining tread appearance. For running gear, request the location and basis of any wear measurements, with dated pictures of the relevant contact surfaces. Pair those observations with the exact manufacturer's reference and acceptance criteria before making a reuse decision. A percentage remaining without a named datum, reference dimension and method is not a comparable technical measurement.
Keep configuration and service limits separate
A machine can acquire replacement frames or an alternative undercarriage package during its life. Preserve current installation evidence and the source of any narrow interchange approval; do not generalize one manufacturer's named system claim across all tracks. Tension, wear limits, bushing work and tensioner service require exact documentation and qualified handling of stored energy. This hub supplies no tension setting or universal wear percentage. Its purpose is to make the selection record precise enough to reveal what still needs to be established.
Specification evidence record
Published values retain their exact reference scope. Empty fields mean the value has not been established; they never mean zero. General model associations do not establish installed or serial-specific fitment.
Tracked undercarriage: documented values and open identification fields
Property
Value / status
Scope and interpretation
Installed frame/system identity
Not yet documented
Record actual package and left/right location, not only carrier model.
Track width/pitch/link count
Not yet documented
Retain nominal source and actual measurement separately.
Guiding and drive-lug profile
Not yet documented
Document inner interface; outer tread alone is insufficient.
Steel chain/shoe arrangement
Not yet documented
Separate chain, shoes and fastening scope.
Sprocket/roller/idler arrangement
Not yet documented
Match documented running gear and wear-system variant.
Wear measurement record
Not yet documented
Require reference new/limit dimensions from the exact system before calculating wear.
Unresolved technical and source questions (2)
No track size-to-machine fitment, tension value, wear limit or system-wide interchange approval established.
Camso historical size rows and machine application tables are not reproduced.
Original HeavyEQ analysis and selected source facts. No catalogue reproduction licence, manufacturer endorsement or machine-specific compatibility is implied.
Steel track groups: pitch, chain construction and measured wear evidence
General component authority; manufacturer references are independently scoped
A tracked undercarriage is a chain of mechanical interfaces. Separate the drive hub, sprocket, chain, shoes, rollers, idlers and recoil/adjustment system before researching any individual replacement.
Steel track-chain groupComponent-family research illustration. Verify exact part identification and fitment separately. Representative steel track-chain group only; this article also distinguishes separate assemblies. Exact configuration and machine fitment are not established.
Component family researchInstalled fitment not established
Each reference retains its own subject and conditions. A series, model or family name does not establish an installed component, safe setting or interchangeable replacement.
Documented reference
Specifications with configuration evidence
Expand each row before comparing values. Examples, standards metadata and architecture observations retain their original scope.
Berco: Medium excavator undercarriage
Steel track groups: pitch, chain construction and measured wear evidence: Berco: Medium excavator undercarriage
Parameter
Reference value
Evidence
Construction-excavator range lower chain pitch
140 mmBerco construction-excavator product range
Scope & source
Lower endpoint of Berco product-range statement, not a model specification.
Reference: Berco construction-excavator product range
Manufacturer documentary reference; not a HeavyEQ machine measurement
Construction Excavator: manufacturer product-range introduction,chain versions,roller and sprocket variants
Web reference has no dated edition; checked15October2026
No named machine application or serial fitment established
Source checked 2026-10-15. Selected factual reference and original analysis; catalogue tables,drawings and media are not reproduced.
Open identification fields (4)
These values have not been established. Unknown, unavailable, unverified and not applicable remain distinct evidence states; none means zero.
Steel track groups: pitch, chain construction and measured wear evidence: unresolved identification requirements
Parameter
Evidence state
Required scope
Installed chain pitch / link count
Not yet documentedRequested unit: mm / count
Exact chain group and qualified original-unit evidence required
Master-link or pin construction
Not yet documented
Issuer-specific design and revision
Actual wear and limiting datum
Not yet documentedRequested unit: mm
Exact group, method, original reference and qualified limit required
Sprocket / roller / idler interfaces
Not yet documented
Separate each mating-component identity and installed position
Pitch is a chain property,not shoe width
Track-chain pitch describes the repeated longitudinal spacing defined by the chain design. Shoe width is a transverse dimension of a different component. Link count, master-link or master-pin arrangement and pin/bushing construction add independent information. A wide shoe does not establish pitch, and equal pitch does not establish a complete compatible track group. Retain the full manufacturer group identity before splitting the record into individual dimensions or construction terms.
Manufacturer ranges are deliberately bounded examples
Berco publishes different chain-pitch ranges for its construction-excavator and mini/utility product scopes. The selected endpoints below describe those manufacturer ranges. They are not the chain pitch of Cat320, KomatsuPC210, D6 or any other named machine. Berco also distinguishes chain constructions and mating-component variants. That supports a more precise research taxonomy, but does not authorize a rubber/steel conversion or a universal parts application outside a documented solution.
Chain construction changes the identification question
Keep dry, greased, sealed and lubricated descriptions tied to the issuing manufacturer and exact group. These labels should not collapse into one generic chain identity. A master-pin or split-link design is another distinct interface. Record the documented design rather than inferring it from the presence of a visible fastener. This page describes identification requirements only; it provides no pin-removal, pressing, assembly or lubrication procedure.
Wear evidence needs reference datums
A measured dimension is interpretable only when the original reference, measurement method, datum and applicable manufacturer limit are known. Keep a qualified observation separate from a catalogue dimension and from a seller condition statement. A wear percentage cannot be responsibly calculated from a photograph or borrowed from a different chain group. Irregular wear may involve multiple mating components;an individual replacement does not establish that rollers, sprockets or the frame have been assessed.
Follow the drive interface to the ground
The reducer output mates to a sprocket or segment arrangement. Its mounting register, drilling, offset and face orientation are separate from the teeth that engage the chain. Roller and idler profiles then guide and support the group. Finally, the shoe or tread interacts with the ground and intended duty. Evidence at one interface does not propagate through the whole chain. Matching bolt count, tooth count or a single diameter leaves other critical comparisons unresolved.
Original comparison: three records for one replacement inquiry
Maintain a factory-configuration record, an actual installed-group record and a condition/inspection record. A factory parts book can correctly identify original equipment while a later retrofit changes the present group. A measured worn component can explain condition without defining original geometry. Keeping these records separate lets a reviewer resolve a disagreement instead of silently replacing the original evidence. Preserve the source, date and as-inspected status of each observation.
Model and historical boundaries
Dozer and excavator duty, frame options and track configurations need their own documentation. A shared family name or manufacture year cannot establish a track group or a wear limit. Retain prior rebuilds, shoe changes and sprocket replacements in the investigation. For rubber belts, nominal width, pitch and link count are only the beginning;internal guiding and engagement remain separate. Track tensioners, recoil springs and supported machine loads require the exact qualified service procedure. No generic sag, adjustment pressure, fastener torque or spring-release instruction is published.
Unresolved technical and source questions (3)
No actual machine chain pitch or wear limit is established.
No general steel/rubber conversion or transitive sprocket/track fitment is accepted.
Service and adjustment evidence remains exact-machine and safety specific.
Original HeavyEQ analysis and selected source facts. No catalogue reproduction licence, manufacturer endorsement or machine-specific compatibility is implied.
Rollers, idlers and tensioners: distinguish the running surface from its support
General component-family research; exact fitment not established for your machine
A roller diameter is only one part of an undercarriage identity. The chain or belt must be supported, guided and allowed to move around the frame. Rollers, idlers and adjustment equipment participate in that system through different contact surfaces, mounts and load paths.
Bottom track rollerComponent-family research illustration. Verify exact part identification and fitment separately. Representative bottom track roller only; this article also distinguishes separate assemblies. Exact configuration and machine fitment are not established.
Component family researchInstalled fitment not established
Each reference retains its own subject and conditions. A series, model or family name does not establish an installed component, safe setting or interchangeable replacement.
Open identification fields (6)
These values have not been established. Unknown, unavailable, unverified and not applicable remain distinct evidence states; none means zero.
Rollers, idlers and tensioners: distinguish the running surface from its support: unresolved identification requirements
Parameter
Evidence state
Required scope
Frame side and roller station
Not yet documented
Names bottom/carrier position and exact installed station.
Tread and flange section
Not yet documentedRequested unit: mm
Needs named datums for load and guidance surfaces.
Shaft/support mounting geometry
Not yet documentedRequested unit: mm
Separate complete assembly mounts from bare shell dimensions.
Seal/environment variant
Not yet documented
Requires exact manufacturer build, not visual inference.
Idler/adjuster group
Not yet documented
Includes support and recoil scope without service instructions.
New/reference/limit dimension
Not yet documentedRequested unit: mm
Requires exact source and measurement method.
Separate working positions before comparing shapes
Bottom rollers support the running track against the lower frame; a carrier roller, where fitted, occupies a different position on the returning run. An idler redirects the track around an end of the frame and works with a support and adjustment arrangement. These roles explain why a round component with the right outside diameter may still be the wrong assembly. The first identification drawing should be a position map, showing which frame, side and station the part belongs to, rather than a catalogue photograph with no location. Record whether the supplied object is a shell, a complete roller, an idler wheel or an idler/support assembly.
Flanges define a guidance relationship
Berco explicitly distinguishes several roller flange arrangements in its product range. That manufacturer taxonomy is evidence of variation, not a dimensional match for a machine. HeavyEQ analysis separates the tread surfaces that carry load from the flanges that interact with the track guidance geometry. Their widths, offsets and intervening clearances describe different constraints. A double-flange roller is not approved merely because another roller at a nearby station has two flanges. Preserve a section drawing or qualified geometry record for the exact part, including which surfaces the dimensions refer to, before comparing two descriptions.
The mount completes the component identity
A roller shell can look correct while the shaft-end, mounting-foot or support arrangement differs. Similarly, an idler wheel does not identify its sliding support or the frame guides in which it operates. Berco describes cast, fabricated and forged idler constructions; those are manufacturing branches, not interchangeable strength ratings. Record the attachment pattern, shaft/support type, installed orientation and assembly boundary as separate fields. An idler quote that includes its supports should remain distinct from a bare-wheel quote, even if both sellers use the same convenient product name.
Sealing and environment are not visible from diameter
A complete roller includes an internal support and sealing arrangement whose condition is not established by an unworn exterior. Temperature-specific versions, seal packages and manufacturer revisions can matter even where external geometry appears equal. Treat sealed-for-life language as the stated design of a documented family, not evidence that a used unit has intact lubrication or no inspection requirements. A condition record can distinguish tread wear, flange damage, mounting damage and visible leakage. It cannot translate an exterior photograph into an internal clearance, lubricant condition or remaining-life percentage.
Keep adjustment evidence outside the replacement shortcut
The idler, adjuster and recoil components should remain separately identifiable. Their physical association does not make the complete tension mechanism a routine roller service item. Store the frame-group identity, adjustment type and applicable service-document reference without publishing release, disassembly or pressure instructions. A meaningful comparison record includes original part identity, position, mounting interfaces, contact profile, supplied scope and dated condition observations. Geometry, wear limits and adjustment values remain undocumented here. A qualified review of the complete track system must resolve whether a proposed replacement belongs in that installed arrangement.
Opposed wear needs a position-specific explanation
A worn flange on one side and a marked running surface elsewhere are observations to place on the same position map. They are not proof of one shared cause. Compare sides, stations and contact faces using dated records, retaining the distinction between measured shape and a proposed explanation. A replacement research record becomes more useful when it identifies which neighbouring interfaces were checked and which remain unknown; a generic roller photograph cannot supply that history.
Unresolved technical and source questions (3)
Exact roller and idler geometry, material grade and seal build.
Applicable wear limits and qualified condition assessment.
Frame-specific adjustment/recoil documentation; no settings imported.
Original HeavyEQ analysis and selected source facts. No catalogue reproduction licence, manufacturer endorsement or machine-specific compatibility is implied.
Final-drive sprockets: compare the hub interface and the track engagement separately
General component-family research; exact fitment not established for your machine
A sprocket joins two interfaces: the drive output and the moving track. Matching one side does not establish the other. This guide develops a two-sided comparison record, extending final-drive identification without assuming that a bolt pattern or tooth count proves a replacement.
Track drive sprocketComponent-family research illustration. Verify exact part identification and fitment separately. Representative track drive sprocket only; this article also distinguishes separate assemblies. Exact configuration and machine fitment are not established.
Component family researchInstalled fitment not established
Each reference retains its own subject and conditions. A series, model or family name does not establish an installed component, safe setting or interchangeable replacement.
Open identification fields (6)
These values have not been established. Unknown, unavailable, unverified and not applicable remain distinct evidence states; none means zero.
Final-drive sprockets: compare the hub interface and the track engagement separately: unresolved identification requirements
Parameter
Evidence state
Required scope
Installed output-hub identity
Not yet documented
Separate drive tag, casting and donor-machine information.
Mounting pitch-circle diameter
Not yet documentedRequested unit: mm
Requires specified circle and hole datums.
Central register geometry
Not yet documentedRequested unit: mm
Nominal bore alone does not establish a locating fit.
Axial tooth-plane offset
Not yet documentedRequested unit: mm
Must identify reference mounting face.
Track engagement profile
Not yet documented
Exact chain/belt design and tooth geometry required.
Segment/group identity
Not yet documented
Distinguish loose segment, complete set and support.
Define the output boundary
Identify where the final-drive assembly ends and the sprocket begins. A complete drive, a reducer output hub and a sprocket are separate purchasing scopes even if supplied together. The hub or flange carries the sprocket through a particular register, mounting face and attachment arrangement. Record the installed drive designation independently from a housing casting or donor-machine name. If a drive has been replaced or converted, the original machine reference and the observed output interface may describe different configurations. Preserve both records rather than silently choosing the more convenient identifier.
A mounting pattern is more than its hole count
Bolt count is a useful screening field, but it does not define the circle, hole type, central locating interface or thickness of the clamped region. Nor does a matching nominal bore resolve the intended locating fit. HeavyEQ analysis keeps each dimension tied to an explicit datum and a qualified drawing or observation. Berco notes different drilling arrangements for final-drive flanges in its excavator range. That limited manufacturer statement supports the need for a mounting branch, without supplying any actual hole-circle dimensions or permission to infer a machine application.
Tooth engagement belongs to the chain or belt
The sprocket teeth must interact with the fitted steel-chain bushing or rubber-track drive construction. Pitch, tooth profile and the shape of the engagement space are different observations from outside diameter or tooth count. A worn profile can also be misleading when used as a template for a new component. Keep the documented original geometry separate from measurements of the worn item. A proposed sprocket therefore needs both a drive-side match and a track-side match; agreement on the first cannot compensate for missing evidence on the second.
One-piece and segmented arrangements have different boundaries
Berco distinguishes sprockets and segment groups, including segmented dozer designs. Treat that as a construction distinction rather than a universal class rule. A segment is not a complete sprocket, and a segment set needs its own group identity and mating support. Axial position also matters: a correct-looking tooth ring can sit differently relative to the track guides if its mounting offset differs. Record which face and centre plane define an offset instead of publishing an unexplained dimension. No fastening specification or installation procedure follows from this comparison.
Build a comparison that exposes unanswered interfaces
Use a record with four independent decisions: output identity, mounting geometry, track engagement and supplied condition. Record source authority for each, so a seller assertion cannot accidentally become an OEM application. Note localized tooth wear, damaged mounting areas and unreadable markings as observations, not approval for reuse. A rebuilt final drive needs its own ratio and test evidence; a new sprocket does not validate those internal properties. Keep all geometry fields blank until qualified evidence exists, and retain a conflict status when a nominal pattern agrees but the locating or engagement details remain unresolved.
Matching is a chain of separate decisions
Treat the comparison as two linked questions: whether the sprocket attaches to the documented output interface, and whether its driving geometry belongs to the documented track system. A favourable answer to one question leaves the other open. Even an apparently complete dimension set needs its measurement basis and revision. This avoids promoting partial agreement into an interchange claim while giving a supplier or engineer a precise description of the unresolved interface.
Unresolved technical and source questions (3)
No actual mounting geometry, tooth geometry or fastening values verified.
No link from any sprocket to a named machine/PIN established.
Donor or aftermarket conversions require current installed-interface evidence.
Research sources and scope
Berco sprockets ↗ · component manufacturer first party · checked 2026-10-15
Sprocket and segment distinctions; no dimensions imported
Selected factual reference and original analysis; catalogue tables,drawings and media are not reproduced.
Original HeavyEQ analysis and selected source facts. No catalogue reproduction licence, manufacturer endorsement or machine-specific compatibility is implied.
Track shoes and grousers: ground contact is not the chain identity
General component-family research; exact fitment not established for your machine
A track shoe provides the ground-contact platform attached to a steel track group. Its width and grouser profile describe different aspects of the assembly. Neither dimension substitutes for chain pitch, shoe attachment geometry or a manufacturer-approved underfoot application.
Track shoe and grouser plateComponent-family illustration of one standalone triple-grouser steel track shoe. One representative shoe form only; plate/rib dimensions, hole pattern, metallurgy, hardware, chain compatibility, ground suitability and machine fitment are unverified. Representative track shoe and grouser plate only; this article also distinguishes separate assemblies. Exact configuration and machine fitment are not established.
Component family researchInstalled fitment not established
Each reference retains its own subject and conditions. A series, model or family name does not establish an installed component, safe setting or interchangeable replacement.
Open identification fields (6)
These values have not been established. Unknown, unavailable, unverified and not applicable remain distinct evidence states; none means zero.
Track shoes and grousers: ground contact is not the chain identity: unresolved identification requirements
Parameter
Evidence state
Required scope
Shoe complete design
Not yet documented
Separate ground-contact part from chain group.
Shoe width
Not yet documentedRequested unit: mm
Does not populate pitch or whole-machine ground pressure.
Grouser profile and count
Not yet documented
Requires height/shape and source context beyond a category name.
Link seating / hole pattern
Not yet documentedRequested unit: mm
Includes attachment datums and hole form.
Pad or special-end arrangement
Not yet documented
Distinguish added pad from rubber track construction.
Underfoot application basis
Not yet documented
Requires specific manufacturer scope, not generalized width advice.
Separate shoe, fastening and chain records
The chain carries the repeating link and bushing geometry; the shoe attaches across it and presents a surface to the ground. Record the exact shoe design independently from the chain group and its fastening arrangement. A width entry does not identify bolt pattern, hole form, pad thickness or the seating surfaces against the links. If a supplier offers a complete track group, make clear whether shoes and fastening components are included. This is a scope distinction, not approval to combine loose parts from different groups.
Grouser count does not define the complete profile
Berco identifies multiple grouser configurations within its excavator product range. Treat those as distinct design categories rather than a universal one-to-one mapping between grouser count and machine class. Height, spacing, profile, pad thickness and manufacturing design can still differ within a category. Caterpillar’s D11 extreme-service discussion illustrates that pad and grouser construction can be application specific. That example cannot supply dimensions, material properties or a substitution rule for another dozer or an excavator. Preserve the actual design and its stated application scope.
Width changes the support question
A wider shoe changes the footprint, but nominal width alone does not establish a complete ground-pressure or load-distribution calculation. Machine mass, contact length, frame layout, ground conditions and other assumptions would need their own basis. Cat’s excavator undercarriage discussion specifically connects shoe choice with underfoot conditions. HeavyEQ analysis uses that as a reason to retain the application context, not as a generic width recommendation. A shoe that appears attractive for flotation still needs the exact machine and undercarriage approval before a configuration decision.
Pads and special ends add another interface
Rubberized, padded or specially shaped shoes should retain their own construction and attachment identity. A removable pad is not the same thing as a complete rubber track, and a shoe with a modified end shape should not disappear into a generic width field. Record pad retention and the parent shoe design where documented. A worn ground-contact surface may obscure the original profile, so keep the nominal source drawing separate from observations of the used component. No image, including an educational rendering, is a dimensional or material certificate.
Condition records should preserve what was actually assessed
Describe bent or damaged shoes, worn grouser surfaces, distorted holes and damaged seating areas by location. A remaining-height measurement requires the correct datum, an original reference and the applicable acceptance limit before it becomes a wear assessment. For rebuilt or modified track groups, request traceable identity and the defined work scope without inferring an approved welding or repair process. Keep shoe geometry, material grade and fastening values blank until exact evidence exists. Link a proposed shoe to the documented chain/frame arrangement rather than treating a familiar nominal width as a fitment key.
Keep ground-contact comparisons two dimensional
A shoe can change the apparent ground-contact footprint without supplying enough information to calculate the actual pressure distribution. Width alone does not describe contact length, terrain support or load transfer during work. Keep any footprint description tied to the observed machine and surface, and leave ground-pressure claims unresolved without the appropriate complete basis. This makes a shoe comparison more informative while avoiding a performance promise from one convenient dimension.
Unresolved technical and source questions (3)
No shoe dimension, fastening value or machine-specific width approval verified.
Material and manufacturing variants require exact product evidence.
Wear/repair acceptance remains dependent on qualified manufacturer documentation.
Original HeavyEQ analysis and selected source facts. No catalogue reproduction licence, manufacturer endorsement or machine-specific compatibility is implied.