pajibson
Senior Member
This engine is in a square shooter SS636. Put a genuine john deere reman engine in with new injectors and i get zero throttle response. But if you grab the joystick & put a load on the engine the injection pump will rev it up to keep the idle rpm.
Pinned the engine @ tdc and verified pump timing. Installed new lift pump. Had the injection pump rebuilt at a reputable shop and same problem. I have 3.5psi coming out of the lift pump. Took the pump & injectors back out and took them back to pump shop. I watched them run it through the test procedures on bosch test machine.
So at this point I'm wondering what else could be causing this. Anybody have any ideas?
Pinned the engine @ tdc and verified pump timing. Installed new lift pump. Had the injection pump rebuilt at a reputable shop and same problem. I have 3.5psi coming out of the lift pump. Took the pump & injectors back out and took them back to pump shop. I watched them run it through the test procedures on bosch test machine.
So at this point I'm wondering what else could be causing this. Anybody have any ideas?