The Machine That Does What Nothing Else Can and Why That Changes the Parts Conversation
A motor grader occupies a category of its own in the earthmoving fleet. Where a bulldozer is measured by volume moved and an excavator by metres dug, a motor grader is evaluated by the geometry it produces, the flatness of a haul road, the accuracy of a subgrade cross-section, and the consistency of a gravel surface maintained to specification under ongoing traffic load. That standard applies to every pass, across every application, from maintenance of highways to highway construction and civil grading projects.
What makes that precision possible is a set of mechanical systems found on no other earthmoving machine. The circle and blade assembly, a rotating ring gear that carries the grader blade beneath the machine's frame, allows the operator to adjust blade angle, side-shift, and cutting pitch simultaneously with a level of control no other machine configuration delivers. The drawbar and moldboard serve the same geometry, and the tandem rear drive axles keep the machine stable under the cross-slope grading conditions that would compromise any single-axle platform. These are systems unique to the motor grader, and the parts that serve them are equally specific.
Sourcing motor grader parts correctly means knowing the model, the production generation, and the specific system the part belongs to. Circle gear specifications between a CAT 120G and a 120H are not the same. A Champion 710A and a Champion 720A carry different blade and drive configurations. A legacy Austin Western or Galion 503 requires sourcing depth that mainstream supply chains no longer maintain. Imara Engineering's grader parts catalogue is built around that specificity.
Motor Grader Parts by System: Complete Component Coverage
Every working system on a motor grader has its own wear profile and its own parts requirement. Imara Engineering covers them all:
Circle, Blade, and Drawbar Assembly:
- Circle ring gear and circle drive motor components
- Cutting edges — standard, bolt-on, and carbide-tipped configurations for road and aggregate surfaces
- End bits, corner wear plates, and moldboard wear liners
- Drawbar ball joint, pivot pins, and side-shift cylinder hardware
- Blade lift and tilt cylinder assemblies
Tandem Drive and Rear Axle:
- Tandem drive chain assemblies and drive sprocket components
- Rear axle differentials, axle shaft seals, and hub assemblies
- Brake system components across drum and disc configurations
- Wheel drive components and tandem frame hardware
Hydraulic System:
- Circle drive hydraulic motor and associated pump assemblies
- Blade angle, lift, side-shift, and articulation cylinder components
- Wheel lean cylinder assemblies and steering circuit hardware
- Control valve bodies, hoses, O-ring seal kits, and filtration assemblies
Front Axle and Steering:
- Front axle kingpin and pivot bush assemblies
- Steering cylinder components and tie rod hardware
- Wheel lean pivot and camber adjustment components
Engine, Cooling, and Service:
- Engine components cross-referenced by manufacturer and model designation
- Radiators, water pump assemblies, and cooling fan hardware
- Air filtration, fuel system components, and scheduled service kits
Cab and Electrical:
- Cab glass panels, door seals, and structural cab hardware
- Operator controls, instrument gauges, and switch assemblies
- HVAC components, wiring harnesses, and lighting assemblies
Motor Grader Parts by Brand and Model: Every Manufacturer Covered
CAT Motor Grader Parts
Cat grader parts and Cat motor grader parts are the highest-volume motor grader sourcing category globally, and Caterpillar grader parts at Imara Engineering cater to the model-generation depth that Caterpillar's production history demands. The Caterpillar series spans multiple production generations under the same number designations and parts between those generations are not interchangeable without serial number verification.
Model-specific coverage includes:
- Cat 12 grader parts — base 12 series components across production years
- Cat 12E grader parts — 12E-specific powertrain and hydraulic configurations
- Cat 120G grader parts — 120G circle drive, blade, and hydraulic assemblies
- Cat 120H grader parts — 120H-generation components catalogued as distinct references from the 120G
- Cat 140H grader parts — the larger 140 platform, with 140H tandem drive and hydraulic-specific coverage
Every cat motor grader parts order is cross-referenced to the model designation and serial number before dispatch.
Komatsu Motor Grader Parts
Komats dispatch parts at Imara Engineering cover the GD series from the GD505 and GD511 through to the GD655 and GD705. Hydraulic system components, circle drive assemblies, tandem drive chains, cutting edges, and blade hardware are all catalogued by model designation. OEM-quality and aftermarket options are available across the full Komatsu motor grader range, with every part referenced to model and serial number before dispatch.
Champion Motor Grader Part Dispatch is one of the few equipment manufacturers whose entire identity is built around the motor grader. Unlike the major OEMs that produce graders as one product line among many, Champion's engineering heritage is grader-specific, and that focus shows in the machine's mechanical design and in the depth of parts support the catalogue requires.
Champion motor grader parts at Imara Engineering are stocked with that context in mind:
- Champion 710A motor grader parts — 710A hydraulic circuit, circle drive, and tandem drive components catalogued as distinct model references
- Champion 720A motor grader parts — the larger 720A platform, catalogued separately from the 710A with its own circle and blade specifications
- Champion grader parts across broader production configurations, including earlier series machines still operating on regional road maintenance programs
For operators managing Champion graders on long-cycle road maintenance contracts, the Champion grader parts depth at Imara EEngiChampion is built around the ongoing sourcing requirement of machines that work consistently and replace parts at a predictable rate.
John Deere Motor Grader Parts
John Deere grader parts at Imara Engineering cover the JD motor grader production range with model-level accuracy:
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John Deere 570A motor grader parts — 570A hydraulic circuit, tandem drive, and circle drive assemblies catalogued by production variant
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John Deere 670 grader parts — the 670-series configuration as a distinct model reference, with its own powertrain and blade specifications
Volvo, Mitsubishi, and Sany Motor Grader Parts
Volvo motor grader parts and Volvo grader parts cover the G-series platforms. Volvoo's grader architecture carries distinct tandem drive and cab design characteristics. Parts are catalogued for both current and legacy Volvo grader configurations, with fitment verified to the model before dispatch.
Mitsubishi grader pathe rts cover tdispatchries machines widely deployed across Asian and Pacific construction markets. Mitsubishi's grader line carries specific blade and circle assembly configurations that require accurate model-level sourcing rather than generic cross-reference.
Sany motor grader parts address the GR series among the more recently expanded grader product ranges now present across infrastructure projects in developing markets globally.
Heritage and Legacy Grader Brands
Motor graders carry one of the longest active service lives of any earthmoving machine, and legacy brands remain on working sites long after their original supply chains have been discontinued, restructured, or absorbed into other organisations. Imara Engineering maintains sourcing depth across the heritage grader brands that still power road maintenance programs and civil projects worldwide:
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Austin Western grader parts — the AW grader series, a staple of road maintenance fleets across decades of highway construction and rural road development
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Galion 503 motor grader parts — the 503 remains a working machine on many active sites, and model-specific components are sourced with accuracy against the 503's configuration.
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Dresser grader parts — legacy Dresser-.International grader platforms, including machines from the International Harvester manufacturing period
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Allis-Chalmers grader parts — legacy AC grades with circle and blade assembly specifications distinct from any current production machine
For machines not listed, particularly discontinued configurations and regionally distributed models with no remaining OEM support, contact Imara Engineering directly. Legacy motor grader parts sourcing is one of the more specialised capabilities in the Imara Engineering catalogue, built around the reality that some of the most active road graders in the world are machines mainstream supply can no longer reach.
OEM and Aftermarket Grader Parts: Precision Requirements Vary by System
On a motor grader, the case for OEM parts and the case for aftermarket parts are both correct,t but they apply to different systems on the same machine, and that distinction matters.
The circle ring gear and its drive components are precision-manufactured parts. Ring gear tooth profile, circle drive motor tolerances, and drawbar geometry hardware are built to specifications that have a direct bearing on the grade quality the machine delivers. For these components, particularly on CAT, Komatsu, and Champion platforms, where circle geometry is central to machine performance, OEM-quality parts matched to the exact model and production generation are the right choice.
Cutting edges are a different calculation entirely. A motor grader working on unsealed aggregate roads or mine haul surfaces consumes cutting-edge material at rates that make replacement a serious cost line. Aftermarket motor grader cutting edges that match OEM specification deliver equivalent service life at a lower cost per pass, and for road maintenance fleets running multiple graders across long operational programmes, that cost difference across a season is meaningful. End bits, wear plates, filter assemblies, and seal kits follow the same logic.
Road Grader Parts for Sale: Ordering from Imara Engineering
Road grader parts for sale at Imara Engineering are available for global order with full tracked dispatch from confirmation. Whether dispatching a planned annual service on a highway grader fleet or responding to an urgent breakdown on an isolated mine site road, the order process is consistent and built for accuracy across a category where model specificity is not optional:
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Confirm model designation and serial number — production generation differences on machines like the CAT 120G versus 120H, or the Champion 710A versus 720A, mean the serial number is the foundation of every order.
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Identify the system — circle and blade, tandem drive, hydraulics, powertrain, or cab and electrical.
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Choose OEM or aftermarket — both options are available with specification details for comparison before commitment.
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Please note our order — global shipping is arranged from the point of order, with tracked dispatch on every consignment.
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Request sourcing dispatch for legacy machines — for Austin Western, Galion, Dresser, and Allis Chalmers configurations, direct contact with Imara Engineering produces better results than a standard catalogue search.
For grader parts for sale on legacy platforms or models with thin mainstream supply, reaching the Imara Engineering team directly is always the right first step.
