Beatrice Lang
Bobcat is a well-known manufacturer of skid-steer loaders, compact track loaders, mini-excavators, and compact wheel loaders. While Bobcat machines are generally reliable, they may occasionally encounter issues with shutting down. This can be due to various reasons, such as electrical contact problems, a faulty fuel shutoff solenoid, or a stuck relay. In some cases, the machine may continue running even with the key removed. To address these issues, users can refer to service manuals, seek assistance from authorised dealers, or explore online forums for troubleshooting advice. Additionally, Bobcat has introduced a Remote Engine Disable/Enable feature, allowing operators in Europe to remotely shut down their machines through the Owner Portal or Machine IQ app.
| Characteristics | Values |
|---|---|
| Issue | Electrical contact issue within the ignition switch or the fuel shutoff solenoid is stuck |
| Solution | Remove the air filter cover, cover the opening to starve the engine of air, then remove the negative battery cable |
| Other Solutions | Unplug the solenoid on the injection pump, switch the relay around |
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What You'll Learn
Bobcat MT100 skid steer won't shut off
If your Bobcat MT100 skid steer won't turn off, even with the key out of the ignition, this could be due to a problem with the fuel shutoff solenoid.
First, check the fuel levels in your Bobcat MT100 to ensure there is enough fuel for the engine to start. Next, inspect the dashboard for any warning lights or indicators that might be illuminated. Finally, consider whether you have had any previous issues with the electrical system in your Bobcat MT100 before this problem occurred. If you have experienced electrical issues, the problem may be with the wiring between the key switch and the fuel shutoff solenoid.
If the above steps do not identify the problem, you may need to consult a mechanic or a Bobcat dealer. To prevent future issues, it is important to regularly check the coolant, fuel, oil, and hydraulic fluid levels of your Bobcat MT100, as well as perform basic maintenance tasks such as greasing the rollers.
If you are able to access the back of the machine, you can try opening the back door, starting the machine, and then unplugging the fuel shutoff solenoid. If the machine shuts off, the issue is likely mechanical rather than electrical. If it is electrical, the problem could be bad wiring between the key switch, fuel shutoff solenoid, and timer, or a sticky relay. In this case, you may need to consult a professional for further diagnosis and repair.
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Bobcat 773 won't turn off
If your Bobcat 773 won't turn off, there could be a few potential causes. Firstly, it could be a mechanical or electrical issue. If it's mechanical, opening the back door, starting the machine, and unplugging the fuel shutoff solenoid may help. If it's a mechanically sound machine, the linkage will spring over to stop it from running.
However, if it's an electrical issue, it might take longer to diagnose and resolve. For example, if you have a G-series Bobcat, you should receive some kind of code in addition to the fault. This could indicate a problem with the start circuit or another component. On the other hand, if you have an F-series machine, there could be bad wiring between the keyswitch, fuel shutoff solenoid, and timer, or a sticky relay, causing the power to the solenoid to remain on even when you turn the key off.
In some cases, the issue could be related to the battery or the alternator. If you're experiencing battery problems, such as a low battery or difficulty cranking the machine, it could be related to the machine not turning off. Additionally, a bad diode inside the alternator can cause voltage current to be sent to the ignition circuit while the alternator is turning, keeping the shutdown solenoid powered and the engine running even after turning the key off.
Another possible cause could be a faulty ignition switch or wiring harness. Checking the ignition switch, wiring harness, and fuel shut-off solenoid relay is a good idea to ensure they are functioning properly.
If the problem persists, consulting a professional technician or referring to the service manual for your specific Bobcat model may be necessary to identify and resolve the issue.
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Bobcat 753 won't shut off
If your Bobcat 753 won't shut off, there could be a few potential causes. Firstly, check for any mechanical or electrical issues. If it's a mechanical problem, opening the back door, starting the machine, and unplugging the fuel shut-off solenoid will help identify the issue. If the machine is mechanically sound, the linkage will spring back to the stop position and the machine will shut off.
If the problem is electrical, it may take a bit more time to diagnose. For a Bobcat 753, potential electrical issues could include faulty fuses, relays, or corrosion in connectors. A bad ground on the negative battery cable could also be the culprit. Check if there is power at the ignition switch by testing the negative cable to an engine ground connection. If there is no power, start checking the fuses and relays using the diagrams provided in the 753 book of your machine manual.
Another potential issue could be a stuck relay in the fuse panel. This can be diagnosed by unplugging the solenoid on the injection pump. If the machine turns off, then the issue is likely a stuck relay. A stuck relay will continue to feed power to the shut-off solenoid even when the key is turned off, which will drain your battery.
Additionally, some machines have a diode in the alternator or wiring harness that, if faulty, can feed the kill solenoid and cause the machine not to shut off. This can also drain the battery.
If you're experiencing battery problems, it may be worth checking the battery itself and ensuring it's functioning properly and holding a charge.
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Bobcat 743 skid steer won't start
If your Bobcat 743 skid steer won't start, there could be a few potential issues at play. Firstly, it is important to check if the machine is receiving fuel. If there is fuel in the injectors, the issue may lie elsewhere. However, if there is no fuel reaching the injectors, the most common problem is a broken fuel pickup tube inside the fuel tank.
To diagnose this issue, you can remove the outlet line from the lift pump and crank the engine. If you observe a steady stream of fuel coming from the lift pump with each stroke, then the fuel pickup tube is likely functioning properly. On the other hand, if the fuel is spitting and spurting, it is possible that the pickup tube has broken inside the tank.
Another potential issue could be related to the glow plugs. Even on a hot summer day, these engines often require the use of glow plugs for a cold start. To troubleshoot this, you can use a test light or voltmeter to verify if the glow plugs are receiving power when activated. If they are indeed powered, the next step is to test them with an ohm meter, which requires disconnecting the power wire connected to the jumper strip at the glow plugs and then removing the jumper strip to test each glow plug individually.
Additionally, it is worth checking the fuel shut-off solenoid, as it can sometimes stick and cause issues. This is a small magnetic actuator that controls the fuel shut-off function. If it is not opening or only partially opening, you can use a wire to hold it open until a replacement is sourced.
It is also important to inspect the starter gear and engine gear. Ensure that the starter gear is engaging properly with the engine gear. If there are issues with the starter, replacing it may be necessary, but be sure to check that the replacement is an exact match and properly shimmed to align with the flywheel.
Finally, wiring issues could be the culprit. Ensure that the wires to the starter and solenoid are connected correctly and are free of corrosion or damage.
If the problem persists, consulting a Bobcat dealer or a qualified mechanic is recommended to identify and resolve the issue.
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Bobcat electrical issues
Bobcat machines are prone to a variety of electrical issues. One common problem is a machine that won't turn off when the key is turned off. This could be due to a stuck relay in the fuse panel, or a faulty switch that continues to feed power to the shut-off solenoid. This issue can cause the battery to drain. Another potential cause is a diode in the alternator or wiring harness that feeds the kill solenoid when it fails, also draining the battery.
Some Bobcat models, such as the T300, have experienced electrical problems with the door switch. Removing the door on this model does not seem to affect the sensor, but it can cause the hydraulics to cut out while driving, preventing the loader frame from lifting. This may be related to the lap bar sensor or a problem with the BICS circuit.
The Bobcat 863 model has also experienced electrical issues preventing auxiliary (aux) usage. In this case, the aux system would not engage, and revving the engine to full throttle and pushing the button was required to enable the system. This issue may be related to pressure relief or an electrical fault.
For the Bobcat 773, a machine that won't turn off could be due to bad wiring between the key switch, fuel shut-off solenoid, and timer, or a sticky relay. For G-series models, a fault code should be displayed, while F-series models may have bad wiring.
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Frequently asked questions
This could be due to an electrical contact issue within the ignition switch or a stuck fuel shutoff solenoid. Try removing the air filter cover and covering the opening to starve the engine of air. Once the engine has died, remove the negative battery cable. If this doesn't work, you may need to purchase a service manual to help diagnose the issue.
If your Bobcat Model 753 is not shutting off, it could be due to an electrical issue. Check for any error codes that might be displayed, such as the ECL-1 error code, and refer to the electrical diagram for the machine to identify the problem.
This issue could be caused by a faulty ignition switch or a stuck fuel shutoff solenoid. Try covering the air filter opening to restrict airflow and cause the engine to die. Once it stops, disconnect the negative battery cable.
