Kubota D902 Engine: High-Quality Piston and Ring Supply

The Kubota D902 Diesel Engine is a powerful and compact unit widely used in equipment such as the Kubota U20 Mini Excavator and RTV utility vehicles. These precision parts are essential for maintaining engine compression and oil control.

• Kubota D902 Piston: High-grade aluminum alloy piston, designated by Part Number 1J091-21110. Search efficiently using the non-hyphenated 1J09121110.

• Kubota D902 Piston Ring Set: A complete set of compression and oil control rings, matching OEM specification Part Number 1J091-21050 (search term: 1J09121050).

• We provide a comprehensive range of D902 Overhaul Components, including Crankshaft Bearings and Full Gasket Sets.

Choose Honour Time Machinery Limited for reliable Kubota Engine Parts and exceptional service for your Mini Excavator Maintenance requirements.

Core Business Operations: Component Supply and Global SEO Targeting

As a leading exporter, Honour Time Machinery Limited specializes in engine components and Engine Total Assembly for the world's major heavy machinery brands:

Cummins, Komatsu, Caterpillar, Isuzu, Kubota, Yanmar, and Weichai.

Our expansive product portfolio ensures complete engine repair coverage:

• Cylinder Liner (Wet and Dry options)

• Piston (1J09121110)

• Piston Ring (1J09121050)

• Crankshaft Main Bearing (Flange/Plain sets)

• Connecting Rod Bearing (Standard/Oversize)

• Thrust Washer (Crankshaft end play control)

• Engine Overhaul Gasket Kit (Full Gasket Set)

• Diesel Pump (High-pressure fuel pump)

• Fuel Injector (Nozzle and complete assembly)

• Crankshaft (New and used options)

• Turbocharger (Housing and core assembly)

• Water Pump (Engine cooling)

• Oil Pump (Engine lubrication)

• Cylinder Block (Short and long blocks)

• Cylinder Head (Loaded and bare heads)

• Connecting Rod (Standard size)

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Construction Machinery Vocabulary: Part Function and Location

Essential definitions for heavy equipment engine and hydraulic parts, noting their typical installation location:

1. Oil Pressure Switch: Screws into the Engine Block or Oil Filter Housing. Kubota D902 Engine Oil Pressure Sensor – Monitors the pressure of the engine lubrication system.

2. Hydraulic Gear Pump: Mounted on the Engine Flywheel Housing or PTO. Caterpillar 305E Mini Excavator Hydraulic Pump – Converts engine rotation into hydraulic fluid flow and pressure.

3. Governor Spring: Located inside the Injection Pump or Governor Housing. Yanmar 3TNV88 Engine Governor Spring – Controls the engine speed by regulating fuel delivery.

4. Engine Oil Pan: Forms the Bottom of the Engine Block. Cummins ISB Engine Oil Sump Gasket – Stores the engine oil when the engine is running.

5. Bucket Pin and Bushing: Located at the Attachment End of the Boom/Arm. Komatsu PC30-7 Bucket Pin and Bushing Kit – Pivots the bucket for digging and dumping action.

6. Piston Pin (Gudgeon Pin): Connects the Piston Head to the Connecting Rod Small End. Isuzu 3LD1 Engine Piston Pin Clip – Facilitates the pivoting motion of the connecting rod.

7. Exhaust Manifold Gasket: Seals the connection between the Cylinder Head and Exhaust Manifold. Weichai WP6 Engine Exhaust Manifold Gasket – Prevents exhaust gas leaks at the engine outlet.

8. Track Chain (Track Link): Forms the Main Structure of the Track System. Caterpillar D6T Track Link Assembly – The segments that connect to form the continuous track.

9. Water Jacket Plug (Core Plug): Pressed into openings in the Cylinder Block/Head Casting. Kubota D902 Engine Frost Plug Set – Seals the cooling system casting holes.

10. Swing Bearing Seal: Located around the Slew Ring Gear. Komatsu PC200-8 Swing Bearing Seal Kit – Protects the swing circle bearing from contamination.

Technical Solution: Engine Overheating Diagnostic

Fault: Yanmar Vio50 Mini Excavator (4TNV94 Engine) Overheats Rapidly

Fault Detail:

A Yanmar Vio50 Mini Excavator, powered by a Yanmar 4TNV94 Engine, quickly reaches high operating temperatures, especially under heavy work. The coolant level is correct, but circulation appears poor.

Solution/Treatment Plan:

1. Check Radiator and Oil Cooler: External blockage is a key issue in construction equipment. Thoroughly clean the fins of the Radiator and Oil Cooler from debris (mud, dust). A blocked radiator prevents heat exchange.

2. Test Thermostat Function: A stuck-closed Thermostat will restrict coolant flow to the radiator. Remove and test the Yanmar Thermostat by placing it in hot water to ensure it opens at the specified temperature. Replace if it fails to open or opens too late.

3. Inspect Water Pump and Belt Tension: Confirm the Water Pump impeller is intact and the drive belt tension is correct. A slipping belt or corroded impeller in the Yanmar 4TNV94 Water Pump can drastically reduce coolant circulation, leading to overheating and potential damage to components like our featured Pistons and Cylinder Liners.

Connect with Honour Time: Your Reliable Engine Parts Source

For guaranteed quality on engine parts, including the essential Kubota D902 Piston 1J091-21110 and the corresponding Ring Set 1J091-21050, contact Honour Time Machinery Limited. We are your dedicated Source Manufacturer, ready to handle all your engine component needs through efficient global Foreign Trade Export.

Global Supplier of Cummins, Komatsu, Caterpillar, Isuzu, Kubota, Yanmar, Weichai Parts.