The Komatsu 4D95 Engine Family: A Complete Guide
The Komatsu 4D95 engine is a diesel engine that Komatsu built for its own machines. It powers many types of heavy equipment around the world. People know it for being tough and lasting a long time. This guide explains the different versions of this engine, the machines they go into, and how to take care of them.
What Is the Komatsu 4D95 Engine?
The 4D95 is a four-cylinder diesel engine. Komatsu designed it to work in construction and industrial machines. It uses direct fuel injection. This means fuel goes straight into the cylinders. The design helps the engine burn fuel cleanly and start well in cold weather.
The engine family has many versions. Each version has different power levels and features.
The Different Versions of the 4D95 Engine
Komatsu made several versions of the 4D95. Here are the main ones you will find.
4D95-1
This is one of the earliest versions. It has a mechanical fuel system. That means it uses simple parts to control fuel. It puts out about 117 horsepower. You can find it in older Komatsu PC60 and PC70 excavators.
4D95E
The 4D95E makes about 130 horsepower. It uses a mix of mechanical and electronic parts to control fuel. This helps the engine run smoother and quieter. It also uses timing belts instead of gears. This version often goes into Komatsu WA70, WA80, and WA100 wheel loaders.
4D95L
This engine makes about 127 horsepower. It is a versatile engine. It works in both excavators and loaders. You can find it in PC80, PC95, and PC120 excavators. It also powers WA120, WA150, and WA170 wheel loaders.
4D95S
The 4D95S is the most powerful version in the basic line. It makes about 137 horsepower. It is built for heavy work. You can find it in GD85A and GD105A bulldozers. It also powers industrial generator sets .
4D95LE and SAA4D95LE Variants
The “LE” in the name stands for something important. It means the engine has a turbocharger and an intercooler. These parts help the engine make more power without getting bigger.
The SAA4D95LE-5 is a common version. It has 4 cylinders. Each cylinder has a bore of 95 millimeters and a stroke of 115 millimeters. The piston displacement is 3.26 liters. It makes about 92 to 99 horsepower, depending on the machine. You can find it in PC60-8 excavators and WA150-6 wheel loaders.
The SAA4D95LE-6 is a newer version. It meets Tier 4 Interim emission standards. It uses advanced engine control to manage air and fuel. This engine does not need a diesel particulate filter. It uses a simpler catalyst system instead.
Another variant is the 4D95LE-3. It powers machines like the WA90-5 wheel loader made between 2005 and 2008.
Which Machines Use the 4D95 Engine?
Many Komatsu machines use this engine family. Here are the main ones.
Excavators
The 4D95 engine powers several Komatsu excavators.
- PC60 Series: This includes the PC60-8. It uses the SAA4D95LE-5 engine. The machine weighs about 6,180 kilograms. The engine makes 55 horsepower at 1,950 rpm .
- PC120 Series: The PC120 excavator uses the 4D95L engine.
- PC138 Series: The PC138USLC-10 uses the SAA4D95LE-6 engine. It makes about 93.5 horsepower. This machine has a short tail swing. It works well in tight spaces .
Wheel Loaders
The 4D95 engine powers many Komatsu loaders.
- WA70, WA80, WA100: These loaders use the 4D95E engine.
- WA120, WA150, WA170: These loaders use the 4D95L engine.
- WA150-6: This loader uses the SAA4D95LE-5 engine. It makes about 98 horsepower. The machine has a hydrostatic transmission. This helps it use less fuel .
Bulldozers
The 4D95S engine powers Komatsu bulldozers like the GD85A and GD105A. These machines need the extra power for pushing heavy loads.
Forklifts and Material Handlers
The 4D95 engine also powers Komatsu forklifts. The FH Series forklifts use the SAA4D95LE-5 engine. These forklifts can lift 9,000 to 11,000 pounds. They use a hydrostatic drive system. This system helps save fuel, especially in jobs with many start-stop cycles.
The engine also powers the VHD50A container handler. This machine works in ports, moving shipping containers.
Other Equipment
You can also find the 4D95 engine in other machines.
- Generator sets: The engine powers diesel generators for backup power.
- Agricultural equipment: Some tractors and harvesters use this engine.
- Industrial equipment: This includes air compressors, concrete mixers, and pumps.
- Dump trucks: Some small dump trucks use the 4D95 engine.
How to Take Care of the 4D95 Engine
Taking care of this engine is important. Good maintenance helps it last longer.
Follow the Service Schedule
Komatsu has a service schedule for each machine. You should follow it. The schedule tells you when to change oil, filters, and other parts.
Use Genuine Parts
Always use genuine Komatsu parts. This includes filters and lubricants. Non-OEM parts can cause problems. They might not fit right or work as well. This can lead to engine wear and failure.
Check the Air Filter
The 4D95 engine often works in dusty places. Check the air filter often. A dirty air filter lets dust into the engine. This wears out the cylinders and piston rings. Replace the filter when it gets dirty.
Check the Oil
Check the engine oil every day. Look at the dipstick. Make sure the oil is at the right level. Also, look at the oil color. Clean oil is important. Change the oil at the right time .
Watch for Leaks
Look under the machine for leaks. Oil, fuel, or coolant leaks are bad. They can lead to bigger problems. Fix leaks when you find them.
Listen to the Engine
Pay attention to how the engine sounds. If you hear new noises, something might be wrong. A knocking sound could mean worn bearings. A hissing sound could mean an air leak.
Use the Right Fluids
Use the fluids that Komatsu recommends. This includes engine oil, coolant, and hydraulic fluid. The right fluids help the engine run well and last longer.
Buying a Used 4D95 Engine
If you need to buy used 4D95 engine, here are some things to think about.
Check the Hours
Ask how many hours the engine has run. Lower hours are usually better. But you need to verify this. Look at the machine’s service records.
Ask for Videos
Ask the seller for videos of the engine running. Ask for a cold start video. This shows how the engine starts when it is cold. Also, ask for a video of it running under load.
Check the Maintenance Records
Look at the maintenance history. A good history means the engine was taken care of. Look for records of oil changes and filter changes.
Inspect the Engine
If you can, look at the engine in person. Check for leaks, rust, and damage. Look at the oil on the dipstick. If it looks milky, water is getting in the oil. That is bad.
Know the Variant
Make sure you get the right engine variant. Check the model number. Different variants have different power levels and features. The right one must match your machine.
Final Thoughts
The Komatsu 4D95 is a solid engine family. It powers many different machines. From small excavators to forklifts to bulldozers, this engine does the job. It has many variants. Each one is built for certain machines and tasks.
If you take care of this engine, it will last a long time. Follow the service schedule. Use genuine parts. Check things regularly. This keeps the engine running well.
At Yutian Machinery, we know these engines well. We can help you find the right one for your machine. We check each engine before it leaves. We also help with shipping. If you have questions, please contact us.
