I have a question about a John Deere 4620 tractor. The injector pump broke down and I purchased a remanufactured part from the dealer. I understand that the timing of the tractor is basically adjusted when the injection pump is installed. Are there any special considerations to take into account when installing the remanufactured pump today.
You’re right, the pump has a key to adjust the timing on the gear, it will only go one way. Mount the pump again as close to the same position on the mounting flange as you can. This way the timing will be the same as before.
Make sure to replace the sealing washers on both sides of the banjo bolts that hold the line adapters to the injection pump, or it will leak. Bleed the system to the injection pump before starting. Leave the injection lines loose at the injectors, then turn the key and start the engine until the fuel comes out of the high-pressure tubes at each injector. Then tighten the lines and start the engine.
The pump is the fuel transfer pump, mounted on the side of the engine, it has a lever on the side of it, which is pumped manually, to prime the system up to the injection pump.