07-23-2025, 12:36 PM
The Bobcat 873G is a popular skid-steer loader known for its durability and versatility in construction, agriculture, and landscaping. However, like all heavy machinery, the 873G can sometimes face issues that affect its performance. One common problem that operators encounter is excessive smoking during operation. If your Bobcat 873G is smoking, it’s essential to identify the cause and address it before it leads to more severe engine damage.
This article explores the potential causes of smoking in the Bobcat 873G, offers troubleshooting advice, and suggests solutions to help keep your machine running smoothly.
Types of Smoke and What They Indicate
The first step in troubleshooting a smoking Bobcat 873G is to identify the type of smoke coming from the exhaust. Different colors of smoke can indicate different issues, and each requires a unique approach to solve.
White Smoke
White smoke is typically caused by coolant entering the combustion chamber, which can be a result of a blown head gasket, cracked cylinder head, or leaking radiator. The coolant burns along with the fuel, creating white smoke, which is visible when the engine is running.
Blue smoke is typically a sign of oil burning. This could be caused by worn-out piston rings, valve seals, or other internal engine components that allow oil to enter the combustion chamber and burn along with the fuel.
Black smoke indicates that the engine is burning too much fuel, which is often a sign of an issue with the fuel system or the engine’s air-to-fuel ratio.
In addition to the specific issues outlined above, there are several general causes of smoking that can affect the Bobcat 873G. Here are some additional factors to consider:
Low-Quality Fuel
Using low-quality or contaminated fuel can lead to poor combustion and excess smoke. This is especially true if the fuel contains water, dirt, or other impurities.
Idling for long periods can cause carbon buildup in the engine, leading to poor combustion and smoke. This is particularly a concern for diesel engines, which are more prone to this issue.
Failing to perform routine maintenance on the Bobcat 873G can lead to various performance issues, including smoking. Regular oil changes, air filter replacements, and fuel system checks are critical for keeping the machine running efficiently.
To avoid smoking problems in the future, it’s important to implement preventive measures:
Excessive smoking in the Bobcat 873G can be caused by a variety of issues, ranging from engine problems to fuel system malfunctions. By understanding the types of smoke and their underlying causes, you can effectively troubleshoot and resolve the issue before it escalates. Regular maintenance, high-quality fuel, and careful operation are key to keeping your machine in optimal condition and preventing smoking problems from occurring.
If you encounter persistent issues, consult a qualified mechanic or technician to perform a thorough inspection and address any underlying problems that may require repair or replacement.
This article explores the potential causes of smoking in the Bobcat 873G, offers troubleshooting advice, and suggests solutions to help keep your machine running smoothly.
Types of Smoke and What They Indicate
The first step in troubleshooting a smoking Bobcat 873G is to identify the type of smoke coming from the exhaust. Different colors of smoke can indicate different issues, and each requires a unique approach to solve.
White Smoke
White smoke is typically caused by coolant entering the combustion chamber, which can be a result of a blown head gasket, cracked cylinder head, or leaking radiator. The coolant burns along with the fuel, creating white smoke, which is visible when the engine is running.
- Symptoms: Continuous white smoke, often accompanied by a loss of coolant or overheating.
- Possible Causes:
- Blown Head Gasket: A blown head gasket can allow coolant to seep into the cylinders.
- Cracked Cylinder Head: A crack in the cylinder head can cause coolant leakage into the combustion chamber.
- Faulty Radiator or Cooling System: A malfunctioning radiator or cooling system can lead to coolant leakage, causing white smoke.
- Inspect the head gasket for damage. If it is blown, it must be replaced immediately.
- Perform a pressure test on the radiator and cooling system to check for leaks.
- If the cylinder head is cracked, replacement will be necessary. Always ensure that the new cylinder head is compatible with the 873G.
- Blown Head Gasket: A blown head gasket can allow coolant to seep into the cylinders.
Blue smoke is typically a sign of oil burning. This could be caused by worn-out piston rings, valve seals, or other internal engine components that allow oil to enter the combustion chamber and burn along with the fuel.
- Symptoms: Blue smoke that persists after the engine warms up, along with excessive oil consumption.
- Possible Causes:
- Worn Piston Rings: Over time, piston rings can wear out, allowing oil to seep into the combustion chamber.
- Worn Valve Seals: Valve seals that are worn out may also allow oil to leak into the cylinders.
- Oil Overfill: Overfilling the oil reservoir can cause excess oil to enter the combustion chamber.
- Perform a compression test to check the condition of the piston rings. If compression is low, the piston rings or cylinders may need to be replaced.
- Inspect the valve seals for wear. If they are worn, replacing the valve seals should resolve the issue.
- Ensure that the engine oil is at the proper level and not overfilled.
- Worn Piston Rings: Over time, piston rings can wear out, allowing oil to seep into the combustion chamber.
Black smoke indicates that the engine is burning too much fuel, which is often a sign of an issue with the fuel system or the engine’s air-to-fuel ratio.
- Symptoms: Black smoke, especially when the machine is under load, and poor fuel efficiency.
- Possible Causes:
- Clogged Air Filter: A clogged air filter restricts airflow, causing an imbalance in the air-fuel mixture.
- Faulty Fuel Injectors: Damaged or clogged fuel injectors can cause too much fuel to enter the combustion chamber.
- Fuel Pump Issues: A malfunctioning fuel pump can deliver an incorrect fuel supply to the engine.
- Check and replace the air filter if it is clogged or dirty. A clean air filter ensures proper airflow and a balanced air-fuel mixture.
- Inspect the fuel injectors for clogs or damage. Clean or replace them as necessary to restore proper fuel flow.
- Have the fuel pump tested to ensure it is delivering the correct amount of fuel. If the pump is faulty, it may need to be repaired or replaced.
- Clogged Air Filter: A clogged air filter restricts airflow, causing an imbalance in the air-fuel mixture.
In addition to the specific issues outlined above, there are several general causes of smoking that can affect the Bobcat 873G. Here are some additional factors to consider:
Low-Quality Fuel
Using low-quality or contaminated fuel can lead to poor combustion and excess smoke. This is especially true if the fuel contains water, dirt, or other impurities.
- Symptoms: Smoke may appear as the engine starts, with the exhaust smelling unusual.
- Solutions: Always use high-quality, clean fuel and store it properly to prevent contamination. If you suspect the fuel is contaminated, drain the tank and replace the fuel.
Idling for long periods can cause carbon buildup in the engine, leading to poor combustion and smoke. This is particularly a concern for diesel engines, which are more prone to this issue.
- Symptoms: Smoke may appear during or after long periods of idling.
- Solutions: Avoid excessive idling, and ensure that the engine is regularly driven under load to prevent carbon buildup.
Failing to perform routine maintenance on the Bobcat 873G can lead to various performance issues, including smoking. Regular oil changes, air filter replacements, and fuel system checks are critical for keeping the machine running efficiently.
- Symptoms: Smoke may appear suddenly, often accompanied by other signs of neglect such as poor performance or unusual sounds.
- Solutions: Follow the manufacturer’s recommended maintenance schedule to ensure that the machine is operating optimally. Regular maintenance will help prevent issues like smoking, poor fuel efficiency, and engine damage.
To avoid smoking problems in the future, it’s important to implement preventive measures:
- Use High-Quality Fuel: Always fill your Bobcat 873G with clean, high-quality fuel from a reputable source. Avoid filling up at questionable stations or using old fuel.
- Perform Regular Maintenance: Regularly check the oil level, replace the air filter, and clean the fuel injectors. Staying on top of routine maintenance will help prevent many common issues that lead to smoking.
- Monitor Engine Temperature: Overheating can cause serious engine damage. Ensure the cooling system is functioning properly to avoid overheating and excessive smoke.
- Keep the Machine Clean: Regularly clean the engine and exhaust system to ensure that debris does not cause blockages or damage.
- Proper Engine Load: Avoid excessive idling and ensure that the telehandler is operated under load to burn off excess carbon.
Excessive smoking in the Bobcat 873G can be caused by a variety of issues, ranging from engine problems to fuel system malfunctions. By understanding the types of smoke and their underlying causes, you can effectively troubleshoot and resolve the issue before it escalates. Regular maintenance, high-quality fuel, and careful operation are key to keeping your machine in optimal condition and preventing smoking problems from occurring.
If you encounter persistent issues, consult a qualified mechanic or technician to perform a thorough inspection and address any underlying problems that may require repair or replacement.
