Sylvie Willis
The Bobcat 763 is a powerful piece of equipment, but like all machinery, it requires regular maintenance and the occasional repair. One such task that owners of this equipment may need to undertake is bleeding the fuel filter. This process can be a little tricky, and there are several steps involved, including priming the fuel system, checking the fuel pickup tube, and replacing the fuel filter. In this discussion, we will cover the key aspects of how to bleed the fuel filter on a Bobcat 763, addressing common issues and providing practical solutions to ensure the equipment runs smoothly.
| Characteristics | Values |
|---|---|
| Fuel filter location | On top of the fuel filter apparatus |
| Fuel filter replacement | Requires flipping the cab and locating the suction line |
| Fuel pickup tube | May need to be replaced if broken |
| Fuel filter bleeding | Turn the knurled bleeder screw counter-clockwise to open, then pump the primer bulb |
| Fuel flow | Should be directed from the mechanical pump to the inlet of the injection pump |
| Knob function | Opens a valve to allow fuel return and air bleeding |
| Injection system | May need to be checked if the problem persists |
| Fuel delivery | Ensure proper fuel delivery from the tank |
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What You'll Learn
The air bleeder on top of the fuel filter housing
If the bleeder screw vibrates off, you will be able to see the threads. To prevent this, ensure that the screw is securely fastened before operating the machine.
The air bleeder is used to remove air from the fuel system. When the knob is opened, it allows fuel to return to the tank through the injector leak-off tees. This process is known as air bleeding and is an important step in priming the fuel system.
It is worth noting that some manufacturers that use the same fuel system do not have a knob, and the small fuel return line is always open, allowing fuel to flow back to the tank at all times.
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Priming the fuel filter
To prime the fuel filter of a Bobcat 763, start by flipping the cab and getting someone to wiggle the suction line to find the right fitting. The return fitting is usually about 2 inches away. Typically, there is a bunch of crud that needs to be removed. Removing the bucket and raising the boom to put the lock on the boom can help you work from the side more easily.
The fitting goes through a grommet, and when you pull it up, you usually get both the fitting and the grommet together. If the hose is broken, you will see a small piece of it at the bottom of the fitting. The replacement hose is 9 inches long and should have a check valve at the bottom. This check valve keeps the hose hanging down and helps to keep fuel in the lines.
Next, you need to replace the pickup hose and the filtered end clunk. When reassembling, do not assemble the elbow and grommet outside the tank. Put the new pickup tube through the grommet, then attach the new filter and the elbow and attach it to the fuel line. Use some grease on a new grommet and elbow to help pop them in.
Now, to prime the system, open the fuel line knob on the injection pump (near the oil fill). Run the primer pump several times. Leave it open by a quarter turn and crank it up. If it doesn't work, open the knob, pump some more, and try again.
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Priming the injectors
To prime the injectors of your Bobcat 763, you must first locate the primer bulb in the fuel line before the fuel filter. There should also be a bleed screw on top of the filter canister, and another one where the fuel line connects to the injection pump.
Open the bleed valve on the injector pump and pump the hand primer. Fuel should then flow back into the fuel tank, and the lines should be purged of air. Ensure that you tighten the bleed screw after this step, or the engine will not run.
If you are still having issues, try the following: loosen the nuts on top of the injectors. When the motor spins, the pump will send fuel up to the injectors, and air will be expelled. When you see the fuel, start closing off the injector flare nuts. Usually, the engine will start running before all nuts are closed. Once the engine starts to kick over, stop cranking and close all nuts before starting the engine.
If you are still experiencing issues, it may be worth checking the fuel filter. If the filter is fine, check the knob above the oil fill cap. Open the fuel line knob on the injection pump and run the primer pump a few times. Leave the knob open by a quarter turn and crank it up. If it still doesn't work, open the knob, pump some more, and try again.
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Finding the drain plug for the chain drive oil
The Bobcat 763 is a powerful machine, but finding the drain plug for the chain drive oil can be a challenge. Here are some detailed instructions to guide you through the process:
Locate the Drain Plug
The drain plug for the chain drive oil on the Bobcat 763 is located at the bottom of the chaincase. It is described as looking like a rubber plug or a "cork stuck in the case". It may be difficult to spot, so take your time and ensure you have adequate lighting to inspect the underside of the machine.
Prepare for Oil Drainage
Before removing the drain plug, it is crucial to prepare for the oil drainage. Place a large pan or container underneath the drain plug to catch the oil. The chaincase holds approximately nine gallons of oil, so ensure your container has sufficient capacity. Alternatively, you can tip the machine forward by placing blocks under the back wheels, allowing the oil to drain from the front fill plug.
Remove the Drain Plug
Once you have located the drain plug, it is time to remove it. Some sources suggest that you can simply pull the plug out with pliers. There is a slight ridge on the backside of the plug, so you may need to work at it to dislodge it. Be cautious, as the oil will start draining once the plug is removed.
Alternative Method: Pumping from the Top
If you cannot locate the drain plug or find it challenging to access, there is an alternative method to drain the oil. You can remove the top case cover, which is located right in front of the seat, and use a pump to extract the oil. This method is easier and avoids the need to get underneath the machine with a large pan.
Refill and Replace the Plug
After successfully draining the oil, it is essential to refill the chaincase with fresh oil. You can use Bobcat chain oil, regular 10W-30, or 10W-40 motor oil. Additionally, consider replacing the drain plug with a new one, ensuring a proper seal to prevent leaks.
Remember to refer to your Bobcat 763 manual for further guidance and always take the necessary safety precautions when performing any maintenance or repairs.
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Troubleshooting a rough idle and lack of power
Firstly, it is important to check for the presence of diesel fuel in the tank. This may seem obvious, but it is a necessary step to ensure that the issue is not simply due to a lack of fuel. If there is fuel in the tank, move on to the next step.
Next, verify that the bleed valve at the spin-on filter is closed and not sucking air. This is an important step, as an open bleed valve can affect the engine's performance. Additionally, ensure that the bleed valve at the injection pump return line is also closed.
Now, let's focus on the fuel delivery system. Check the fuel pickup tube for any signs of damage or blockage. A common issue with Bobcat machines is a clogged strainer on the end of the pickup tube, which can cause the engine to run poorly. If the strainer is clear, move on to the next step.
To further isolate the issue, obtain a clean can of fuel and a rubber fuel hose. Connect the hose to the lift pump, and then place the other end of the hose into the fuel can. Start the engine and observe its performance. If the engine runs smoothly, it indicates an issue with fuel delivery from the tank. If it still runs poorly, the injection system may be the culprit.
If the problem persists, consider checking the fuel pump for any signs of malfunction. A faulty fuel pump can cause the engine to shut down unexpectedly. If the fuel pump checks out fine, the issue may lie with the carburetor, which may need to be cleaned or adjusted.
Finally, refer to your Bobcat 763 troubleshooting guidebook for further guidance. Additionally, there are Bobcat 763 troubleshooting software programs available that can provide step-by-step instructions for resolving various issues with your machine.
Remember to exercise caution when performing any maintenance or repairs, and always refer to the manufacturer's guidelines for specific instructions pertaining to your Bobcat 763 model.
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Frequently asked questions
The brass fitting on top of the fuel filter housing is an air bleeder. To bleed the fuel filter, turn the knurled bleeder screw counter-clockwise to open the bleeder, then pump the primer bulb in the fuel line. Once the filter is full of fuel, it will squirt out of the small hole in the bleeder fitting. Then, turn the bleeder screw clockwise to close it.
First, eliminate any possible problems in the tank. Get a clean can of fuel, drop a rubber fuel hose in it, and connect the hose to the lift pump. Start and run the engine. If the problem persists, the issue is likely with the injection system.
Try priming the fuel system to get it to run.
