Troubleshooting Engine Problems on the 1972 Hough 90E Loader

[MikePhua]

The 1972 Hough 90E is a vintage piece of equipment, but it remains a significant player in many construction and mining operations, especially when refurbished and well-maintained. This heavy-duty wheel loader is designed to handle demanding tasks like digging, lifting, and loading, but as with any machinery of its age, engine issues are bound to arise. Identifying and resolving engine problems in older machines like the Hough 90E can often be a challenge for mechanics, especially with the unique parts and systems that were designed decades ago.
In this article, we will explore common engine problems that owners of the 1972 Hough 90E may face, along with practical troubleshooting tips and potential solutions to get this powerhouse back up and running.
Overview of the 1972 Hough 90E Loader
The Hough 90E loader, produced in the early '70s, was part of the Hough Equipment brand that later became part of the Case Corporation. Powered by a Cummins NTA-885 engine, the loader was designed for tough jobs, particularly in construction and materials handling. Over the years, its durability and reliability earned it a place in many fleets, even though its mechanical systems are now outdated compared to modern machines.
When dealing with an older loader like the Hough 90E, it’s essential to recognize the age of the parts and the fact that finding replacements or skilled mechanics familiar with the machine may be more difficult than it was for newer models. However, many owners and operators of the Hough 90E find that with a bit of care and the right troubleshooting approach, their machines can continue to serve them well.
Common Engine Problems and Solutions
1. Engine Cranking but Not Starting
One of the most common engine issues with the Hough 90E is that the engine cranks but fails to start. This issue is usually related to problems with fuel delivery, ignition, or air intake systems. Some common causes of this problem include:

• Fuel System Blockages: Over time, fuel lines can become clogged with dirt, rust, or debris. This reduces fuel flow to the engine, preventing it from starting.
  
• Faulty Fuel Injectors: The fuel injectors are responsible for atomizing the fuel into the combustion chamber. If they become clogged or malfunction, the engine may not receive the right fuel mixture to start.
  
• Ignition System Issues: If the ignition system, including spark plugs or the ignition coil, is malfunctioning, the engine won’t start.
  
• Air Filter Clogging: A clogged air filter can starve the engine of the necessary air, preventing it from starting properly.
  

Solution: Start by inspecting the fuel system. Check the fuel lines for blockages and replace any damaged or corroded components. Clean or replace the fuel injectors if necessary. Inspect the ignition system and replace any faulty spark plugs or coils. Finally, check and clean the air filter to ensure proper air intake.
2. Low Power and Poor Performance
Another common issue with the Hough 90E is a lack of engine power or poor performance during operation. This can manifest as sluggish acceleration, difficulty in lifting loads, or a general loss of efficiency. Some common causes for this problem include:

• Clogged Fuel Filter: A clogged fuel filter can restrict the flow of fuel to the engine, resulting in lower performance.
  
• Fuel Quality Issues: Contaminated or poor-quality fuel can cause the engine to misfire or run inefficiently.
  
• Dirty Air Filters: Like fuel, the engine also requires clean air for combustion. A clogged or dirty air filter can prevent the engine from performing at its best.
  
• Turbocharger Problems: The Hough 90E's engine is turbocharged, and if the turbocharger is malfunctioning or its components are worn, it can lead to significant power loss.
  

Solution: Start by inspecting the fuel filter and replacing it if it is clogged. Ensure that the fuel quality is up to standard and that there is no water or debris present. Clean or replace the air filter to ensure a proper air-fuel mixture. If the problem persists, have the turbocharger inspected by a professional to ensure it's functioning properly.
3. Engine Overheating
Overheating is a serious problem that can severely damage an engine if not addressed quickly. With older equipment like the Hough 90E, the cooling system may become less efficient due to wear and tear. Common causes of overheating include:

• Radiator Clogging: Over time, debris can accumulate in the radiator, restricting airflow and causing the engine to overheat.
  
• Low Coolant Levels: Insufficient coolant can cause the engine to run hot. This could be due to a leak or evaporation over time.
  
• Faulty Water Pump: The water pump circulates coolant through the engine. If it fails, the engine won’t cool down properly, leading to overheating.
  
• Worn Thermostat: The thermostat regulates the engine temperature by controlling the flow of coolant. If it malfunctions, it can cause the engine to overheat.
  

Solution: Start by checking the coolant levels and topping them up if necessary. Inspect the radiator for debris and clean it out if it’s clogged. Check for any leaks in the cooling system, including hoses and connections. If the water pump or thermostat is worn, replace them promptly.
4. Excessive Engine Smoke
Excessive smoke from the engine can be a sign of a serious problem. The color and smell of the smoke can provide clues about the issue. Some common causes of engine smoke on the Hough 90E include:

• Blue Smoke: Blue smoke typically indicates that the engine is burning oil. This could be due to worn piston rings, valve seals, or other internal engine components.
  
• Black Smoke: Black smoke generally indicates that the engine is burning too much fuel, often caused by an overly rich fuel mixture or a malfunctioning fuel injector.
  
• White Smoke: White smoke is often the result of coolant entering the combustion chamber, usually due to a blown head gasket or a cracked engine block.
  

Solution: If the smoke is blue, it may be necessary to perform a compression test to determine if the piston rings or valve seals are worn. For black smoke, check the fuel injectors and air filter to ensure proper combustion. If white smoke is present, have the engine block and head gasket checked for leaks or cracks.
5. Engine Knocking or Strange Noises
Unusual engine noises, such as knocking, ticking, or grinding, are common indicators of engine trouble. These noises can often be attributed to:

• Low Oil Pressure: If the oil pressure is too low, the engine’s moving parts may not be properly lubricated, causing them to make noise.
  
• Worn Bearings or Pistons: Over time, bearings and pistons can wear down, causing a knocking sound as they move within the engine.
  
• Loose or Damaged Components: Loose parts, such as bolts, exhaust components, or intake manifolds, can also lead to abnormal sounds.
  

Solution: Check the oil pressure and replace the oil and filter if they are low. Inspect the bearings and pistons for signs of wear and replace them if necessary. Tighten any loose components and replace damaged parts to eliminate the noise.
Preventive Maintenance for the Hough 90E
The key to prolonging the life of your Hough 90E and minimizing engine problems is routine maintenance. Here are some tips to keep your machine in top condition:

• Regular Oil Changes: Change the engine oil regularly to keep the components lubricated and prevent unnecessary wear.
  
• Clean Air and Fuel Filters: Regularly clean and replace the air and fuel filters to ensure proper airflow and fuel delivery.
  
• Monitor Engine Temperature: Keep an eye on the engine temperature during operation to avoid overheating.
  
• Check for Leaks: Regularly inspect for leaks in the fuel, oil, and coolant systems to prevent potential problems.
  

Conclusion
While the 1972 Hough 90E loader may be an older piece of equipment, with the right care and attention, it can still perform effectively. Engine issues such as poor starting, overheating, low power, and unusual noises can usually be traced back to common causes like fuel system blockages, dirty filters, or worn components. By following a solid maintenance routine and addressing issues early on, you can keep your Hough 90E running smoothly for years to come, making it a reliable asset on the job site.