5 Common Bobcat S590 Problems – Causes and Solutions

If you’re using the well-known Bobcat S590 skid steer, surely you are enjoying the perks of the Doosan engine. However, several users have reported that this skid steer loader has revealed a few problems, some of which are simple to resolve and some of which are a bit costly.

Some of the common problems found in the Bobcat S590 are Lagging power, the throttle being late to respond, and the failure of the injection pump, the Inlet metering valve, and the fuel injector due to fuel contamination.

We’ve concentrated on resolving all of the skid steers’s most frequent issues. As a result, you’ll have a good idea of how to fix these on your own. Let’s get started!

Bobcat S590 Problems and Remedies At A Glance:

Lagging powerCheck the fluid levels
Unresponsive throttleLet the engine heat up
Injection pump failureMonitor the desired call
Inlet metering valve failureChange the IMV
Fuel injector refusalCheck if they respond to any signal

1. The machine is lagging power

The Bobcat air filter gets plugged sometimes. These new engines are so thirsty for air that when the air purifier is clogged, the oil would be forced out of the motor.


  1. Clean the air filter.
  2. Follow up by replacing the fuel filter.
  3. Check the fluid level and you should find no engine oil in the stick.
  4. Refill properly and the machine should work properly now.

2. The Throttle does not respond

It is common problem with these machines. In the cold weather, the throttle can get clogged up and become slower. It takes some time to respond.


  1. After starting the engine, wait for a while.
  2. Looking for a “Cold” message in the LH display.
  3. If you can see the message, allow the engine to warm up.
  4. During the cold weather, try to keep the machine in a heated place at night.
  5. You should not face the problem anymore.

3. The injection pump is failing

These engine technology injection pumps are hyper delicate to fuel contamination. This same motor may well not start and perhaps run at all if the infusion compressor is going to fail or has failed.


  1. Connecting a sensor to the injector nozzle and monitoring desired vs real rail compression is a short check you can perform.
  2. If the injection system failed, it will have a hard time maintaining the preferred motor rail pressure.
  3. If this is the case, troubleshoot for fuel contamination.

4. The Inlet metering valve is not working.

On the Bobcat D24 as well as D34 propulsion systems, the inlet metering piston is in charge of metering rail compression. If the piston fails, the engine will be unable to respond to commands to increase or decrease rail compression.


  1. Stick your thumb on the Inlet metering valve (IMV) & start the engine in the machinery for a brief search.
  2. When the Inlet metering valve is pumped up, you must feel a slight resonance.
  3. If you don’t, your Inlet metering Valve could be defective or the power cord to the Inlet metering valve could be faulty.
  4. You can change the wire at first, if that does not solve the problem, then you need to change the Inlet metering valve itself.

5. Fuel contamination is the fuel injector.

Delphi’s slightly elevated pressure common rail diesel plugs are used in the Bobcat Doosan D24 as well as D34 motors. Fuel contamination is by far the most common cause of failure in such injection systems. These plugs have very small diesel control valves, and any particles in the nozzle can get embedded in the pressure regulator and cause difficulties.


The fuel injection also can leak rail compression, as we discussed earlier with the injection compressor and rail compression. You can use a sensor to compare desired and actual rail strain to see whether the motor has enough rail strain.

The plugs may bleed rail strain through the fuel exchange, or a nozzle may be stuck exposed. The plugs are tested in the Bobcat equipment application to see if they react to a pulse.

If it does not respond, you may need to change the fuel injector.


When did Bobcat go to Doosan engines?

Bobcat was using Kubota engines until 2015 when it switched to Tier IV Doosan motors. The Doosan fuel oxidation motivating force (DOC) engine runs hotter and consumes more fuel than other engines.

What is the lifting capacity of a Bobcat S590?

The S590 from Bobcat has a high lift path that allows for more load capacity and forward ascend at full elevator height. 2,100 lbs. of reviewed operating capacity

How much is a Bobcat skid steer?

These types of machinery typically have 60-70 horsepower and a cargo capacity of fewer than 2,200 lbs. A fresh Bobcat inside this diameter range costs between $45,000 and $60,000, and a delayed version medium-frame skid steer costs around $30,000.

Can you use any hydraulic oil in a bobcat?

Yes, you can, but bobcat suggests that you use its own all-season hydraulic or hydrostatic fuel.


We’ve looked into most of the most popular Bobcat S590 problems and found the best answers for you. Luckily, there aren’t many flaws with this lovely skid steer loader. The most important problems, on the other hand, are not critical to solving.

If you are having trouble repairing it, please feel free to contact the Bobcat dealers or Bobcat Tractor Corporate entity for help. The majority of these cases are easy to fix, so follow our directions and get the skid steer back in working order!

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