Kubota D722 Engine: High-Performance Piston and Ring Set

The Kubota D722 Diesel Engine is a powerhouse in compact equipment, notably the Kubota K008 Excavator and Bobcat 316 Mini Excavator. When considering an engine rebuild, securing reliable internal components is paramount for maximizing compression and minimizing oil consumption.

• Kubota D722 Piston: Essential for the combustion cycle, ensuring a perfect fit with part number 16851-21112 (also available as 1685121112).

• Kubota D722 Piston Ring Set: The complete ring kit for optimal cylinder sealing, specified as Part Number 16853-21050 (searchable as 1685321050).

• We recommend pairing these with our precise Cylinder Liner to restore the engine bore to factory specifications, ensuring peak D722 Engine Performance.

At Honour Time Machinery Limited, we specialize in high-durability Kubota Engine Parts for Compact Equipment Engine Repair.

Comprehensive Engine Solutions: Our Core Product Offering & SEO Keywords

We are a global leader in supplying both Engine Total Assembly and premium replacement parts for the world's most robust construction, industrial, and agricultural engines, including major brands:

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

Our comprehensive inventory includes all critical internal components:

• Cylinder Liner

• Piston (1685121112)

• Piston Ring (1685321050)

• Crankshaft Main Bearing

• Connecting Rod Bearing

• Thrust Washer

• Engine Overhaul Kit (Full Gasket Set)

• Diesel Fuel Pump

• Fuel Injector

• Crankshaft

• Turbocharger

• Water Pump

• Oil Pump

• Cylinder Block

• Cylinder Head

• Connecting Rod

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Industry Expertise: Engineering Component Location and Function

Accurate identification of the component location is key to efficient repair and maintenance:

1. Oil Seal (Crankshaft Front): Located at the Front of the Engine Block, sealing the Crankshaft. Kubota D722 Engine Front Oil Seal – Prevents oil leakage from the engine front cover.

2. Connecting Rod Bushing: Pressed into the Connecting Rod Small End. Yanmar 4TNV94 Connecting Rod Bushing – Acts as a bearing for the Piston Pin.

3. Intake Manifold Gasket: Located between the Cylinder Head and the Intake Manifold. Cummins ISL Engine Intake Manifold Gasket – Seals the connection to prevent air leaks into the engine.

4. Track Link Assembly: Forms the main structure of the Undercarriage Track. Komatsu PC200-8 Excavator Track Link Pin – Connects the track shoes and runs around the sprockets and idlers.

5. Exhaust Manifold: Bolted to the side of the Cylinder Head. Caterpillar C9 Engine Exhaust Manifold – Collects exhaust gases from the cylinders before directing them to the turbocharger or muffler.

6. Starter Solenoid: Mounted on the Starter Motor. Isuzu 4JJ1 Engine Starter Solenoid Switch – Acts as a high-current switch to engage the starter motor.

7. Throttle Position Sensor (TPS): Located on the Fuel Injection Pump / Throttle Body. Weichai WD615 Engine Throttle Sensor – Monitors the position of the throttle valve for the engine ECU.

8. Alternator Regulator: Typically built into the Alternator Housing. Yanmar 4TNE92 Alternator Voltage Regulator – Controls the output voltage of the alternator to protect the electrical system.

9. Fuel Injector Nozzle: Sits in the Cylinder Head. Cummins B4.5 Engine Fuel Injector Nozzle – Sprays atomized diesel fuel directly into the combustion chamber.

10. Main Control Valve: Located in the Excavator Hydraulic System Center Block. Caterpillar 320D Excavator Main Control Valve Seal Kit – Directs hydraulic fluid flow to various actuators like cylinders and motors.

Engine Troubleshooting: Hydraulic System Power Loss

Fault: Komatsu PC300-8 Excavator Slow Movement After Warm-Up

Fault Detail:

The Komatsu PC300-8 Excavator operates correctly when cold, but all movements (boom, arm, travel) become noticeably slow and weak once the hydraulic oil reaches operating temperature. The engine (likely a Komatsu SAA6D114E) does not stall.

Solution/Treatment Plan:

1. Hydraulic Oil Condition: The primary suspect is low-viscosity or contaminated hydraulic oil. Test the oil for correct grade and check for contamination (water/dirt). Excessive heat drastically reduces performance of thin oil. Replace with the correct Komatsu Hydraulic Fluid.

2. Main Pump Wear (Internal Leakage): High oil temperature exacerbates internal leakage in the Main Hydraulic Pumps. As the oil thins, oil leaks past worn pistons/swash plates back into the case drain, reducing flow and pressure. Conduct a pump flow and pressure test. If leakage is confirmed, the Komatsu Main Hydraulic Pump requires repair or replacement of seals and rotating parts (we supply Hydraulic Pump Seal Kits).

3. Relief Valve Failure: System relief valves may be prematurely opening due to wear or incorrect settings, especially when hot. Check the main and circuit relief valve pressures for the PC300-8 Hydraulic System.

Contact Us: Your Partner for Global Engine Parts Supply

From the precise Kubota D722 Piston 1685121112 to complete Engine Overhaul Kits for Isuzu or Caterpillar, Honour Time Machinery Limited is committed to quality, reliability, and global export excellence. We support your machinery maintenance worldwide.

Honour Time Machinery Limited: Quality Components for Cummins, Komatsu, Caterpillar, Isuzu, Kubota, Yanmar, Weichai Engines.