CAV Injection Pump

Hello. Something different from the usual TDI talk. I'm having a serious power problem with my John Deere, a three-cylinder model from 1978, with 38 kW. It has a ROTO DIESEL CAV injection pump, supposedly with a universal speed governor. It's supposed to have around 50 horsepower, but it feels like it only has 20. When I try to go up a small hill, it feels like I'm losing power, even though I have my foot on the accelerator. I then have to downshift to get to the top.

The fuel filter (LuFi) and diesel filter (DiFi) are new. The lines from the fuel tank, via the pre-lift pump and DiFi, to the injection pump are clean. The pre-lift pump itself has been cleaned and is functioning correctly. The engine starts very well, runs smoothly, and cleanly. Therefore, the problem is likely related to the fuel supply. The engine reacts very sluggishly to sudden acceleration. It also doesn't produce any smoke, even under load.

"If only I knew how to adjust or remove the pump. There are no adjustment screws on it (other than the ones for idle and full load settings)."

Has anyone ever worked with these pumps or is familiar with them? I would appreciate any help.

Here's another picture of JD Parts:

Check the 'standard errors': Is fuel reaching all the injectors, or is it running on all cylinders? Is the fuel injection timing correct?

My personal guess/speculation: only one of the two high-pressure pistons is working, because the second one is stuck, possibly due to a broken spring or something similar, and therefore isn't retracting (they are spring-loaded, right?).

http://www.doppelkabine.de/pixx/lucas/

The high-pressure generation works in a similar way to the VP44; you can use that as a reference.

Hello.

I managed to fix everything. I found a similar, old, leaky pump and took it apart. Surprisingly, this pump is actually very simply constructed.

In short: A valve was not properly assembled in the vane pump. The loose ball became lodged inside the vane pump. Consequently, it was impossible to build up any pressure. Furthermore, the pressure regulating valve for the pump's internal pressure was incorrectly assembled.

So, it seems someone did a sloppy job. But now it's working great, and if anyone ever has a problem with a CAV Lucas Roto Diesel injection pump, feel free to contact me. I also have spare parts for it.