Make sure you take pictures along the way. Lots of them.
Remove springs and their rods/washers. Take out the collar that I’m holding here, and then remove the plunger shaft which is still installed.
Here is the cam plate. Reach in with a magnet and pull it out.
Here is the cam plate.
Remove the rollers and their beveled washers. Note that the beveled washers are placed toward the outside of the rollers.
Rollers removed. At the 3 o’clock position there is a black clip snapped over a pin.
Remove the clip carefully with a flat bladed screw driver and a magnet or it will fly across the room as soon as you pry on it!!!
Remove the pin with a magnet that was covered by the clip.
The pin has a head on it.
Pull the large pin sideways as far as it will go.
The magnet is used to then pull this drive assembly up some.
Then the driven assembly can be removed. Don’t let the large pin fall on the floor.
Make 2 marks on the nose of the pump where your key is located. That way it will match the location of the key way on the gear back on the engine. Remove the large woodruff key.
I have used fine tiped dikes for years. They allow you to grab the key. They also provide nice leverage to remove the key. Note that genuine Cummins woodruff keys have dimple on the side of the key that makes the key fit tight so it won’t fall of the shaft when re-installing the pump onto the motor.
Take the magnet and pull up on the pump shaft. It will slide right out only if the woodruff key is out. Notice the large thrust washer and a small key.
Keep the pump shaft clean and safe. There was a slight varnish buildup where the seal rides on my pump shaft. I used my finger nails with a paper towel in between to remove the varnish. The sealing surface has to stay polished. Do not scratch or file it.
All that is left are the pump vanes. In front of them is the shaft seal. I didn’t remove the pump vanes since the inside of the pump was sterile when I took it apart.