softmachine72
Member
I have checked PRV solenoid seem to be ok. idle is rough but smooths out at higher rpm. have checked speed sensor screen.
the engine had its 10,000 hr rebuild about 50 hrs ago new crank piston sleeves, the full meal deal. also brand new turbo.
Is the governor is that box that the throttle cable attaches to contol throttle? If so is is brand new. also the plungers and injectors are new cat pars and the diesel pump has been rebuilt . It was not doing this after the rebuild. I am not a diesel tech but I am mechanically inclined.I used to work on the line rebuild in engines at the VW dealership. could you go into more detail about the thrust washers for the flyweights ? Is the set point on the governor? how could this problem make it track slow on the lft side? fuel filters are new and screens are clean. what would cause the main pump pressure to be 4600 psi rather than the 4950 psi.
the boom does not hesitate it is just slow. everything is slow, swinging , tracking the left is just slower. would the slow return check being bad cause everything to be slow?
Thanks for you help. do you have a copy of the page from a manual so I can recognize which one it is? so that could be causing the 4600 psi main pressure? we are talking about the slow return?It depends how far it has backed out, It can cause slow operation to very slow jerkey operation. It restricts return flow to cooler and tank. This causes the NFC pressure to be unable to drop and alow the pumps to open up to max for working.
Later Bob
Thanks for you help. do you have a copy of the page from a manual so I can recognize which one it is? so that could be causing the 4600 psi main pressure? we are talking about the slow return?
The big give away for the slow return check that came apart is in the boom circuit. At a lower idle, lift the boom. if it pauses and then jerks up i bet the slow return check is bad.
a slow track in one direction sounds like the crossover line relief, easy to check by swapping top to bottom.