You love your Bobcat S590 skid-steer loader. This rugged, powerful machine helps you use the controls on construction sites to dig, lift, and dump construction materials above the base level of the machine with ease but like any piece of equipment, problems can pop up. Don’t worry, we’ve got you covered.
We’ll walk you through six Bobcat S590 problems and how to get your skid-steer back up and running so you can get back to lifting. From engine troubles to steering woes to pesky warning lights, we’ll tackle some of the most frequent headaches Bobcat S590 owners face. You’ll be back to mulching, bagging, and stripping in no time.
6 Bobcat S590 Problems With Solutions
1. Unresponsive Throttle
If the throttle on your S590 seems stuck or hard to move, first check that the cable isn’t kinked or damaged. Next, ensure the throttle linkage under the control panel is moving freely. Lubricate the linkage and cable with a spray-on lubricant to loosen things up.
Still no luck? It could be a problem with the throttle control switch. Try adjusting the switch—you may be able to clean the contacts or bend them slightly to improve contact. If that doesn’t do the trick, you’ll probably need to replace the throttle control switch.
As a last resort, the issue could lie in the Bobcat engine throttle plate or carburetor. Have a certified mechanic inspect and repair or replace these components. With some troubleshooting, you’ll get your S590’s skid steer responding in no time and running smoothly again.
2. Hydraulic Issues
Many problems with your Bobcat S590 compact track loader can be traced back to the hydraulic system.
The level of the hydraulic fluid should be checked first. It cannot work as expected if the fluid level is too high or too low. Some individuals think it will work better if they overfill it. This should never be done. To the recommended level, always fill the tank.
Once more, if the hydraulic fuel filter is blocked or full of dirt, the loader won’t have enough power. This is because the loader’s power has finally been lost. After all, the blocked filter prevents fuel from flowing.
The hydraulic pump is next. A key component of your loader is located in front of the engine. Verify that it operates according to the specifications. The engine’s power will be reduced if the belts become loose.
Leaks or improper fittings in the hydraulic lines must be inspected as well. The hydraulic system should be pressurized, and the engine and pump should be running before doing this check because pinhole leaks are visible when the fluid in the system is under pressure, so when completing this examination, put on gloves and safety glasses. Check all of the seals and fittings on the control valves before you leave. The valves should completely open and close.
3. Injection Pump Failure
The injection pump on your S590 is responsible for delivering the proper amount of fuel to the engine. If it fails, your machine may experience issues like difficulty starting, loss of power, excessive smoke, or the engine cutting out entirely.
To diagnose an injection pump problem, check for these signs:
- The skid steer loader is hard to start or won’t start at all.
- The Bobcat engine sputters or lacks power under load.
- Thick, black smoke comes from the exhaust.
- The engine stalls or cuts out, especially when the loader is under strain.
Unfortunately, injection pump repair or replacement can be expensive. Before shelling out for a new pump, try simpler fixes like replacing the fuel filter, checking for clogs in fuel lines, or draining old fuel and refueling with fresh diesel. If issues continue, it’s best to have the pump tested by a mechanic to determine if a replacement is truly needed.
Prevent injection pump failure by following good maintenance practices:
- Use only clean, high-quality diesel fuel.
- Replace the fuel filter regularly.
- Drain the fuel tank and refuel at least once a season.
- Have the injection pump serviced as recommended in your owner’s manual.
With proper care and maintenance, an injection pump should last for many years of reliable service. But if it does ultimately fail, replacement may be your only option to get your S590 skid steer loader running strong again.
4. Lagging Power
If your Bobcat S590 loader seems to be lacking power or struggling, there are a few common issues that could be the culprit.
The engine is the heart of your skid steer. Over time, carbon buildup can reduce an engine’s performance. In this case, cleaning the air filter, fuel injectors, and spark plugs is a good idea.
Replacing old fuel lines and the fuel filter can also help improve fuel flow and engine power. Performing regular engine tune-ups and maintenance will help prevent lagging power and keep your loader running strong for years to come.
5. Fuel injector refusal
If your fuel injector is refusing fuel, you likely have clogs or leaks that need attention.
Check the Fuel Filter
The fuel filter cleans debris from the fuel before it enters the engine. If clogged, it won’t allow enough fuel to pass through, starving the injectors. Replace the fuel filter—it’s an easy DIY fix that should be done annually anyway.
Once replaced, drain your fuel tank and refill it with fresh, high-quality gas. Old or dirty fuel can clog injectors over time. A fuel injector cleaner additive may also help break up any existing clogs.
If new filters and fuel don’t do the trick, it’s best to have a mechanic test the fuel injectors. They can use specialized equipment to check for leaks or other damage and perform any necessary repairs or replacements to get your loader running like new again.
6. Inlet Metering Valve Failure
The inlet metering valve controls the flow of fuel into the engine. If it fails or gets stuck, it can cause the loader to run rough, lose power, or not start at all.
To check the inlet metering valve:
- Locate the valve on the side of the carburetor. It will have two fuel lines attached to it.
- Disconnect the fuel lines from the inlet metering valve with the engine off. Check that both fuel lines have fuel flowing through them.
- Remove the inlet metering valve and inspect it for damage or debris. Clean or replace the valve as needed.
- Reinstall the inlet metering valve and reattach the fuel lines. Start the engine and check for smooth running and full power.
- If problems continue, the inlet metering valve may need replacement. Consult your dealer for a replacement part. Proper fuel flow is essential for your skid steer to operate efficiently.
Now you understand the most common Bobcat S590 problems and how to fix them. With regular maintenance and by catching issues early, you’ll be able to keep your skid steer running strong for years to come. Always be on the lookout for unusual noises, leaks, or changes in performance. And don’t forget that your local Bobcat dealer’s service department is there if you need help diagnosing or repairing a problem.
Staying on top of potential problems means you can spend more time enjoying your landscaping projects and less time pushing a broken loader!
What kind of engine powers an S590 Bobcat?
At full lift height, the Bobcat S590 vertical path skid-steer loader has a greater reach than a radius lift path loader without losing speed. It has a Tier 4 diesel engine.
How long does a Bobcat engine run for?
As a general rule, an 80-horsepower machine won’t need an engine overhaul until it has logged more than 8,000 hours; a 40-horsepower machine, on the other hand, will probably need an overhaul after around 4,000 hours.
When did Bobcat start using Doosan engines?
In 2015, Bobcat made the conversion from Tier III Kubota engines to Tier IV Doosan engines. There is a tendency for the Bobcat Doosan diesel oxidation catalyst (DOC) engine to operate hotter and consume more fuel.
What is the bobcat’s carrying capacity?
They can raise up to one-third of their weight because of their large counterweights. For instance, the well-known Bobcat S750 has an operational weight of around 6,500 pounds and a rated operating capacity (ROC) of 1,950 pounds, or roughly 30%.