There are several different symptoms and fixes with these things. Lets make sure you are fixing the right thing here.
Symptom 1: Coffee brews and pours into a mug, but makes less than expected. This gets progressively worse and can get down to a trickle.
Fix: This is most likely just water scaling from hard water. You should descale the machine first and if that does not fix it, try my fix below.
Symptom 2: Water will not draw from the tank to fill the maker.
Fix: This is again a scaling issue and the Machine should be descaled, but you will want to clean the water intake in the base of the machine with a vibrating or ultrasonic toothbrush first.
Symptom 3: Coffee was brewing normally, then suddenly stops. Water seems to draw from the tank then cycles out just as quickly but never pours any coffee.
Fix: This is most likely a clogged dispensing valve which is what I am fixing in the instructions below. This can happen from hard water build up but it is more often caused by coffee grounds getting lodged in the valve.
#1 Phillips screwdriver
#15 Torx driver
canned air
long tweezers
small cable tie
cable snips
Broken Keurig B60 Coffee Maker
Unplug it. There are heaters, pumps, sensors, etc here that are powered and could be potentially dangerous. Right under the top cover there are a few sensors and switches as well, so unplugging first is prudent. It is also important to remove any coffee packet that may be left in the machine and leave it out until the fixing and cleaning is done.
Remove the top access handle. Remove the two Torx screws at the handle pivot points. Before you lift the handle off, use it to open the top like you are going to load it. Now take the handle off.
Remove the lower cover. There are two black screws holding that in place. This just gives you room to get to the upper screw you need to remove next.
Looking up under the front of the top cover, there are two silver screw - remove them. Be careful with these as they are easy to drop and lose. It is a good idea to use long tweezers for taking these out and re-installing them as well.
You should now have 3 sets of screws - don't mix them up.
Push the hood back and lift - it should come off easily. If it gives you any resistance, you probably have it open too far, close the top slightly and push back, then lift.
At the front of the unit there is a hose that terminates into a valve that eventually injects hot water into the coffee packet. Carefully snip the cable clamp and remove the hose.
There are two silver screws holding this valve in place, remove them and the whole assembly will drop out.
Clean out the outlet side with caned air or high pressure water. Be careful, this is really sharp and is normally the part that pierces the top of the coffee packet so it can just as easily pierce your hand.
If this is the problem you will likely find bits of coffee or hard water deposits built up in here. after it is cleaned out you should be able to blow air through from the hose connected side easily.
Reassemble in the reverse direction. Attach valve, then hose and cable tie. Screw in the upper cover (may need tweezers for this), then the lower. Screw in the access handle.
Now plug it back in and run it without a coffee packet so that clean water flows through the system. You may want to also take this opportunity to descale your Keurig and if you have hard water like we do, use an electric toothbrush (the vibrating kind) to clean out the water intake.
You should now have a working coffee maker again.