It has been a common chainsaw problem that the saw is not getting the proper oil to the bar and the chain. This may be a faulty oil pump, a plugged oil filter in the oil tank, or plugged boiler holes on the bar.

Replacement

Step 1: Take off and clean the bar and the chain as well as the saw itself.
Step 2: Start up the chainsaw and check if there is oil coming out of the oil hole.
If there is no oil coming out of that hole, it is not because of the plugged boiler hole on the bar.
Step 3: Take out the oil from the tank. The reason why you need to do this is to check the oil line and the filter in the tank. If they look pretty good, you need to make sure they are still attached well.
Now you have to work on the clutch side where the oil pump is.
Step 4: Take off the clutch drum. You can start by taking the little clip off. So you can take the clutch drum and the roller bearing off as well as the clutch. You may see a worn gear which turns with the clutch. The oil pump shaft or gear is also located there. Check the condition of the pump shaft, if it is worn out, you need to replace it.
Step 5: Access the pump properly. You need to start by removing the handle. You can use a flat screwdriver to gently pry the three little caps off. There are two Torx screws need to be removed as well. After that, you can remove the handle so that you can access the pump successfully.
Step 6: You need to remove the t27 screw which is a connector that connects the oil tube from the oil tank to the oil pump. You have to be extra cautious because it is made of plastic. Pull it up and make sure you have no cracks on this part, if this part is cracked, your chainsaw could be leaking oil all the time. And another reason why people may have a lot of oil leaking out of their chainsaw all the time is a little o-ring part on the connector may need to be replaced.
Step 7: Remove the oil line. You need to grab it with pliers carefully and then just bring it out.
Step 8: Remove the oil pump. You can use a long m5 metric screw and screw it into the back of the oil pump by hand as far as you can. And then use a six millimeter wrench to pry the screw and the pump is also going to come out along with the screw on it. At this point, you also want to make sure that the oil hole on this side where the bar goes is not plugged, you can put a small fuel line in there and blow. You should see the air or hear it coming out from where the pump gear or shaft is located. It is really important to make sure the hole from here to the pump is unplugged.
Step 9: Replace a new oil pump and put all things back on. And it is better for you to replace the oil line as well.

Hipa Oil Pump:

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