PC400-7 PC450-7 WA470-5 SAA6D125E-3 6251-11-1001 Complete Diesel Engine Assembly Compatible with Komatsu

1. Product Overview & Wholesale Price Range

The Komatsu SAA6D125E-3 Complete Diesel Engine Assembly (OEM Part # 6251-11-1001 / 6251-01-1000 / 6251-11-1100) is a 6-cylinder 11.04-liter turbocharged charge-air-cooled diesel motor built for 40-to-45-ton heavy mining excavators and wheel loaders working in harsh quarrying environments.

• Factory Wholesale Price: $9,800 – $16,500 USD (Direct manufacturer pricing — Save up to 50% vs regional dealer markups)
• MOQ & Bulk Discount: 1 Unit (Tiered wholesale discounts available for batch container orders)
• Lead Time: 1–3 business days (Large factory stock ready for immediate worldwide dispatch)
• Warranty: 12 Months full replacement warranty with 100% dynamometer load testing video proof

2. Application Worksite Checklist (施工场景清单)

Engineered for high torque output and long continuous running hours under severe mining operations:

• Heavy Quarrying & Rock Mining: High lugging torque for heavy bucket digging in granite and iron ore open-pit mines with Komatsu PC400-7 and PC450-7 excavators.
• Deep Foundation Excavation & Trenching: Fuel-efficient common rail fuel injection delivering steady power during high-altitude excavation cycles.
• Heavy Material Handling & Loading: Rapid throttle acceleration response for fast loading cycles on Komatsu WA470-5 and WA480-5 wheel loaders.
• Building Demolition & Heavy Crushing: Heavy-duty forged crankshaft and cylinder block built to absorb continuous high thermal and mechanical shock loads.

3. Diesel Engine Troubleshooting & Diagnostic Guide (发动机常见故障排查)

If your 40–45 ton machine is exhibiting engine power or mechanical failure, consult the diagnostic guide below:

1. Fault 1: Black Exhaust Smoke Under Heavy Load & Severe Engine Power Drop (重载剧烈黑烟/整车无力)
   Root Cause: Worn fuel injection pump plungers, clogged injectors, or turbocharger compressor wheel failure.
   Solution: Inspect turbocharger boost pressure and replace with a complete SAA6D125E-3 engine assembly (OEM 6251-11-1001) for instant plug-and-play restoration.
2. Fault 2: Milky Engine Oil & Coolant-Oil Emulsification in Radiator (机油发白乳化/水箱串油)
   Root Cause: Corroded cylinder liner D-rings, cracked cylinder head, or ruptured oil cooler core.
   Solution: Replace damaged oil cooler core / cylinder liners or swap with a complete drop-in engine unit.
3. Fault 3: Abnormal Metallic Knocking Noise From Engine Block (引擎敲缸异响)
   Root Cause: Excessive oil clearance on connecting rod bearings or piston pin gudgeon wear.
   Solution: Replace connecting rod bearings or install a pre-tested complete SAA6D125E-3 engine assembly.
4. Fault 4: Heavy Blow-By Gas & White Smoke Blowing From Oil Filler Cap (机油盖剧烈冒烟吹气)
   Root Cause: Broken piston rings, severe cylinder wall scuffing, or stuck compression ring grooves.
   Solution: Perform a complete engine overhaul or install a new long-block power assembly.
5. Fault 5: Engine High Coolant Temperature Overheating Under Continuous Operation (高温开锅/水温过高)
   Root Cause: Clogged water pump impeller, stuck thermostat, or cracked cylinder head gasket blowing gas into cooling system.
   Solution: Check coolant circulation pump and replace head gasket or replace complete power unit.

4. Hot Machinery Replacement Parts Recommendation (5大品类热门推荐表)

Explore our factory-direct replacement components compatible with major global machinery brands:

5. Frequently Asked Questions & Technical Support (QA 问答专区)

Q1: How do I verify if this SAA6D125E-3 engine assembly fits my Komatsu PC400-7 excavator?
A: Check your original engine nameplate for OEM part number 6251-11-1001 or SAA6D125E-3 stamp. You can also send us your machine serial number for instant fitment verification.

Q2: My PC450-7 excavator emits heavy black smoke and lacks power under heavy load. Will replacing this engine solve it?
A: Yes, heavy black smoke and power loss under load indicate severe fuel system and cylinder compression wear. Installing our complete pre-tested SAA6D125E-3 engine restores 100% factory digging power.

Q3: Is this SAA6D125E-3 diesel engine dyno tested before shipment?
A: Yes, every single engine assembly undergoes a 2-hour dynamometer load bench test verifying oil pressure, coolant temperature, boost pressure, and power curve. A live test video is provided before shipping.