5 Common Problems With Bobcat Tier 4 Engine (+Troubleshooting)

Bobcat machines such as S750, S850, T750, etc., are powerful and versatile track loaders. These machines are equipped with a Tier 4-compliant, Bobcat 3.4-liter diesel engine. Despite having tough construction, they are familiar with problems. However, problems arise after an extended period of use. Wondering what are the common Bobcat tier 4 engine problems.

Most owners encounter starter and battery problems. While some reported that they experienced the overheating issue. Also, cooling system errors, poor performance from the engine, and oil leaks were found in the Tier-4 engine. Diagnosing and solving these complications is vital as it can lead to complete engine failure. 

In this blog post, I discussed the causes and solutions of these issues.

Which Bobcat Model has a Tier 4 Engine?

Bobcat has released a few models with tier-4 engines. This engine delivers high-performing torque throughout a wide span of engine RPM. The below skid-steer loaders feature tier-4 engines.

• Bobcat S750
• Bobcat S770
• Bobcat S850
• Bobcat T750
• Bobcat T770
• Bobcat T870
• Bobcat A770
• Bobcat S450

Bobcat uses tier-4 engines in these models mentioned above for the below benefits.

• The significant fuel efficiency of up to 18%
• Lowers fuel consumption by a maximum of 14%
• Maintains 95% overall productivity
• Improves uptime
• Minimizes maintenance time

What are the Bobcat Tier-4 Engine Problems?

Bobcat tier-4 engine has innovative features, making tasks effortless and comfortable. This engine type lets you carry heavy loads regardless of the terrain type.

As mentioned, this engine has a few problems, including,

1. Starter and battery problem
2. Overheating
3. Cooling system issue
4. Poor performance
5. Oil leaks

How to Fix Bobcat Tier 4 Engine Problems?

Bobcat machines are built tough. Following the guidance in this section, you can troubleshoot and fix the problems on your own. Moreover, if you are unsure about handling the problems, leave the job in the professional’s hands.

#01- Starter and Battery Problem: Jumpstart or Change the Battery

Starting issue is a common problem in Bobcat tier-4 engines. It happens due to a dead or weak battery, a damaged starter motor, or complications with the electrical system.

Here are the steps for fixing a weak or dead battery.

For a weak battery,

• Step 01: This process requires a portable jump starter. Turn the track loader off.

• Step 02: Find out the positive and negative terminals of the battery.

• Step 03: Locate the negative and positive clamps of the portable jump starter. Ensure the jump starter is turned off.

• Step 04: Connect the battery and clamps.

• Step 05: Turn on the portable jump starter and track loader.

For a dead battery,

• Step 01: Park the track loader on an even surface. Locate the battery. Then, disconnect the negative (black-colored) and positive (white-colored) cables.

• Step 02: Uninstall the old battery.

• Step 03: Terminal connectors can be corroded over time. A thorough cleaning is necessary before installing the new battery. Use a wire brush and battery cleaner to clean the tray and connector.

• Step 04: Install the new battery and connect the terminals.

• Step 05: Close the hood and turn the engine on.

Bobcat dead battery replacement cost ranges from $45-$250 based on the engine power. The labor cost is roughly $50. On the other hand, for a jump start, the cost is anywhere from $50-$100.

#02- Overheating: Clean the Clogged Air Filter

Another common complication with the tier-4 engine is overheating when using the track loader for heavy loads. The culprit for this issue is a blocked air filter, a defective radiator, and other problems in the cooling system.

Let’s look at the fixation process of the tier-4 engine overheating problem. However, it would be best to read the owner’s manual of your track loader before proceeding.

• Step 01: Find out the air filter location and remove it. If the filter has any housing, remove it first.

• Step 02: Buy an all-purpose cleaner and spray on the filter. Next, let the filter soak.

• Step 03: Thoroughly rinse the filters from both sides using a garden hose or a faucet. Don’t stretch or wring the filter this way; it can get torn. Rinse the filter several times until the water runs clear.

• Step 04: Complete drying is important before installing the air filter. So, leave the filter to air dry.

• Step 05: Saturate the entire filter with fresh filter oil. Avoid over oiling as it can affect the exposed wires. Then re-install the air filter.

Cleaning an air filter is about $45-$85 on average. While the replacement cost for a damaged air filter is $80-$100.

#03- Cooling System Issue: Replace the Cylinder Head Gasket

Is your Bobcat tier-4 engine water pump creating unusual noise? The loss of liquid coolant may be happening due to external leaks. There is no other option except to change the faulty head gasket of the cylinder head.

So, how to fix the faulty head gasket? Here is the step-by-step process.

• Step 01: Remove the engine valve cover by unfastening the bolts. Also, disconnect all the cables, electrical wires, and hoses connected to the valve cover.

• Step 02: Peel the defective head gasket. Clean oil and grease using a clean rag and brake cleaner.

• Step 03: After cleaning, install the new gasket. Make sure to install it on a dry surface. Moreover, the gasket should be compatible with the engine model. If a sealant is required, apply it.

• Step 04: Then, snug all the bolts of the valve cover. Fasten the bolts following the right torque.

• Step 05: Reconnect the cables, hoses, and wires correctly. Finally, Turn the engine on and check whether everything is perfect.

The cylinder head gasket replacement cost is high. The average cost is $1000-$2000. It is a time-consuming task where the estimated labor cost is more than $1200.

#04- Poor Performance: Ensure Regular Maintenance

The Bobcat tier-4 engine offers poor performance for many reasons, like rusted components or a lack of maintenance. If you experience decreased efficiency and reduced power, be sure that the engine is delivering poor performance.

Follow the below points regarding how to maintain Bobcat tier-4 engines.

• Check and clean the air filter periodically.
• The engine oil needs to be changed regularly with the manufacturer’s recommended fluid.
• Check the cooling system and pour the right coolant into the system.
• Inspect the engine lines for oil leaks. Seal the leak.
• If unusual squeal noise comes from under the hood, check for cracks, wear, and tear in the rubber belts. Replace the belts if necessary.
• Diagnose the condition of spark plugs. If they are damaged, replace them without fail when changing the oil.

Maintenance costs for a Bobcat track loader range from $100 to $2500, depending on the problem.

#05- Oil Leaks: Change the Leaky Oil Filter

Have you faced a low engine oil warning shortly after topping up? Check for oil leak stains on the ground where your Bobcat was parked. If you find oil leaks, change the leaky oil filter without fail. Otherwise, it can do massive damage to your engine.

Here is how to change the leaky oil filter.

• Step 01: Elevate your track loader on a flat level. Then use a jack stand to raise the Bobcat.

• Step 02: Find out the drain plug. Place an oil drain pan below it. Then use a socket wrench to loosen the plug.

• Step 03: Drain the old oil. Once the oil is drained completely, remove the oil filter.

• Step 04: Screw the new oil filter up.

• Step 05: Now, refill the engine with fresh oil. Avoid overfilling.

• Step 06: Check the engine oil level using a dipstick. Turn the vehicle on and check if the Bobcat is running smoothly. Also, inspect for any leaks near the oil filter.

Generally, an oil and oil filter change with conventional oil costs $35-$75. Whereas, if you use synthetic oil, the expected cost will be $65-$125.

Bobcat Tier 4 Engine related (FAQs)

Final Words

In conclusion, Bobcat machines are the most versatile, compact power-track loaders. The manufacturer used Tier 4 engines in several models.

Bobcat tier 4 engine problems must be addressed and solved promptly if you want long-term service from your track loader. Also, ensuring handling guidelines and following the correct maintenance process is the key to smoother operation.

Resources

https://www.bobcatplus.com/tier4.htm