Transmission Oil Coolers by Machine Platform
Imara Engineering's transmission oil cooler catalogue covers the major machine brands and equipment types used across the global construction and mining industry. This page is part of our Radiators and Coolers family if your machine also requires an engine oil cooler, hydraulic oil cooler, or radiator alongside your transmission cooler, our team can source and confirm all components together in a single order. Browse by machine platform below or contact us with your serial number for an immediate part match.
Caterpillar Transmission Oil Coolers
Caterpillar machines are among the most demanding users of transmission cooling capacity in the heavy equipment industry, particularly in dozer and wheel loader applications where the power shift transmission is subjected to continuous high-load cycling across rough terrain and varying gradient conditions. Our cat transmission cooler range covers the full Caterpillar lineup of tracked and wheeled heavy equipment.
Compatible CAT platforms include:
- CAT D6, D7, D8, and D9 dozer transmission oil cooler fitments
- CAT 320, 323, 330, and 336 series excavator final drive and transmission coolers
- CAT 930, 938, 950, and 966 wheel loader transmission oil cooler units
- CAT 773 and 777 mining truck transmission cooler assemblies
- Additional CAT platforms available — contact our team with your serial number for confirmation
Komatsu Transmission Oil Coolers
Komatsu's dozer and excavator platforms operate across some of the most demanding earthmoving and mining environments in the world, placing sustained thermal demands on their transmission and final drive cooling circuits. Our Komatsu transmission cooler range is built to OEM specifications for direct-fit replacement across the Komatsu heavy equipment lineup.
Compatible Komatsu platforms include:
- Komatsu D65, D85, D155, and D375 dozer transmission oil cooler fitments
- Komatsu PC200, PC300, PC400, and PC490 excavator transmission cooler units
- Komatsu WA380, WA470, and WA500 wheel loader gearbox oil cooler fitments
- Komatsu HD785 mining truck transmission cooler assemblies
- Additional Komatsu platforms available — contact our team with your engine and machine serial number
Hitachi Transmission Oil Coolers
Hitachi ZX-series excavators and construction equipment are widely deployed across civil construction and resource extraction projects in Australia, Southeast Asia, and Africa. Our Hitachi transmission cooler range covers the primary Hitachi platforms used across those operating environments. Provide your machine model and serial number, and our team will confirm the correct part and availability before your order is placed.
Compatible Hitachi platforms include:
- Hitachi ZX200, ZX225, ZX300, and ZX350 series excavator transmission coolers
- Hitachi ZX450, ZX490, and ZX530 large excavator transmission cooler fitments
- Hitachi EX-series excavator gearbox cooler units for older fleet machines
- Contact our team with your machine serial number for any platform not listed above
Transmission Cooler and Gearbox Cooler Types Available
Selecting the correct transmission cooler type for your machine and failure mode avoids ordering errors and ensures the replacement performs correctly under your operating conditions. Imara Engineering supplies the following types:
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Full transmission oil cooler assemblies — complete replacement units including all internal passages, external connections, and mounting hardware, used when the entire cooler has failed or been physically damaged and cannot be repaired in service
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Gearbox oil cooler core replacements — replacement core sections used when the cooler's external structure remains intact and only the internal core has corroded, blocked, or developed a pressure leak
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Final drive cooler assemblies — dedicated cooling units for the final drive reduction gearboxes on large tracked dozers and excavators, where the final drives operate as a separate thermal circuit from the main transmission
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Gearbox cooler excavator units — transmission cooling assemblies designed for the specific layout and operating pressures of large hydraulic excavator swing and travel gearboxes
If you are unsure which type your machine platform requires, our team will advise correctly based on your machine model, the transmission architecture, and the nature of the cooling failure before your order is confirmed.
Why Transmission Oil Coolers Fail and What It Costs Your Operation
Transmission oil cooler failures in heavy equipment tend to develop over time before they present as an acute event. Understanding the causes and the progressive cost of running with a degraded cooler protects both your gearbox and your operation's budget.
The Most Common Transmission Cooler Failure Causes
- Internal core corrosion from transmission fluid that has exceeded its service interval, breaking down chemically and attacking the internal passages of the cooler from within over time
- External blockage from fine dust, mud, and compressed debris accumulating in the cooler's fin array and progressively reducing airflow across the core until thermal capacity drops below what the transmission requires
- Physical impact damage from ground debris or equipment contact, cracking the cooler body or damaging external connection ports, causing immediate transmission fluid leakage and rapid fluid loss
- Seal and gasket deterioration at cooler connections allows transmission fluid to bypass the cooling circuit under operating pressure, reducing effective cooling while creating no immediately visible external leak
- Thermal fatigue cracking in older cooler cores that have been subjected to repeated heat cycling beyond the design tolerance of the original core material
The Real Cost of a Deferred Transmission Cooler Replacement
A gearbox oil cooler that is partially blocked or operating below its rated thermal capacity does not produce an immediate machine shutdown. It produces a gradual and accelerating degradation of your transmission's internal components that operates largely out of sight until a gear fails to engage, a clutch pack burns out, or a planetary carrier cracks under the load the transmission can no longer manage thermally. A transmission cooler replacement costs a fraction of what a gearbox rebuild costs in parts alone, without accounting for the machine downtime, crane hire, and labour required to pull and reinstall a heavy equipment transmission on a working site. Replacing the cooler at the first sign of thermal degradation is always the financially rational decision.
Why Source Your Transmission Oil Cooler from Imara Engineering?
OEM Specification Across the Full Transmission Platform Range
Every transmission oil cooler and gearbox oil cooler in the Imara Engineering range is manufactured to OEM specification, matching the original part's internal fluid passage dimensions, connection geometry, pressure ratings, and thermal capacity. We do not supply units that fit on the outside while compromising on internal construction. What you receive is built to perform under the same operating loads and for the same service life as the original manufacturer part, at a cost that reflects aftermarket pricing rather than dealership margins.
Fitment Confirmed Against Machine and Transmission Serial Number
Transmission oil coolers are among the most application-specific components in the heavy equipment cooling system. The same machine model in different build year ranges can require different transmission cooler configurations, and a mismatched cooler that fits physically but operates at the wrong pressure rating creates an ongoing failure risk. Imara Engineering's team cross-references every order against machine make, model, serial number, and transmission type before dispatch. If any uncertainty exists about fitment, we resolve it with you before the part leaves our warehouse.
Dozer and High-Load Application Expertise
Dozer transmission coolers and bulldozer transmission coolers operate under some of the most demanding thermal conditions in the heavy equipment industry, where the power shift transmission is working continuously at high torque and load in ripping, pushing, and grading operations with minimal rest cycles. Imara Engineering's catalogue reflects that operating reality. Our dozer transmission cooler range is sized and specified for sustained high-load duty, not light-cycle equipment applications, and our team understands the difference when advising on replacement specifications for your specific operating environment.
Complete Cooling System Support from One Supplier
Machines that experience transmission overheating events frequently have related issues in adjacent cooling circuits, elevated hydraulic temperatures, reduced radiator efficiency, or failing fan motor output that contributed to the transmission thermal event in the first place. Imara Engineering stocks the complete Radiators and Coolers range, including engine oil coolers, hydraulic oil coolers, radiators, intercoolers, fans, and hoses. If your machine's cooling system requires attention across more than one component, contact our team, and we will source and confirm everything together in a single order.
