Kubota KX057-4

Parts Compatible with the Kubota KX057-4 Mini Excavator

The KX057-4 is the 5 ton class entry in Kubota's current 4 Series mini excavator lineup, replacing the legacy 3 Series KX161-3 in this size class. The platform was eventually replaced again by the current 5 Series KX057-5, with the KX057-4 representing the bridge generation. The V2607-CR-E4 engine in the KX057-4 is the same engine family used in larger Kubota mini excavators and several Kubota tractor applications, which means engine internals (cylinder head, crankshaft, valvetrain hardware) cross widely outside the KX line. The hydraulic system on the KX057-4 is sized for the 5 ton class with a higher capacity main pump than the KX040-4, which means most pump and main control valve service parts are KX057-4 specific and do not interchange with the smaller 4 Series machines.

Cab glass on the KX057-4 cabin variants uses the RD451 series dimensions shared with the rest of the 4 Series cab generation. The KX057-4CA Canadian spec variant shares the chassis, drivetrain, and engine with the base KX057-4 plus regulatory compliance items specific to Canada. Many KX057-4 service parts cross to the KX040-4 in the same generation, particularly engine oil filter, fuel filter, and air filtration, because both machines run engines from the same V2607 family.

Common Replacement Parts for the Kubota KX057-4

Engine service uses Engine Oil Filter 1C02032433 (the high cross fitment Kubota filter that also fits the SVL CTL line and SSV skid steer line) and Engine Oil Filter RD159-51940 (the 4 Series specific EOF). Fuel system service uses the water separator HHV00-51920 alongside the primary fuel filter, with the V0631-51880 fuel filter having a serial number specific fitment that the product page documents. Inner Air Filter R240142289 is the safety element that pairs with the primary air canister on the KX057-4.

Cab service is a meaningful order category on this model because the cab equipped variants dominate field deployment. Cab Air Filter 6A671-75090 covers the cab climate system. Rear View Mirror 36919-53340 is a recurring service replacement, since the larger mirrors on the 5 ton class machines see more rock strikes and snag damage than the smaller 4 ton siblings. Fuel Cap R5611-51120 covers the fuel tank service. Ignition Switch RC461-53960 is the cab cab ignition. Smaller assembly hardware (Oil Gauge Plug 1G513-36550, Shim RD451-19180, Sensor 1J574-59710, O-Ring 04817-50300, Washer 04512-50080, Washer 04512-50120) covers routine top end work.