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656D

M

Montana Rancher

Member
Well it was time to fire up the 656D after it sat all winter. The
tractor started right up however after doing some light field work
the engine started acting sluggish and slow to respond to the
governor. Went back to the shop and put in two new fuel filters and
still the same sluggish response. I am thinking it may be time to
overhaul the fuel injection pump. Am I thinking correctly? The
engine kinda of boggs down then speeds past the initial rpm
setting before it settles back down. Is there something else I
should be looking at?
 
I would agree with fuel flow from tank, if that is good, check it at hose going into pump as those hoses deteriorate and collapse, if that all checks good, you may have fuel return restriction caused by govenor flex coupling failure. Couple ways to check for this, take timing cover off side of pump very cautiously and observe any small little black pieces of plastic. Or, take out all fittings on fuel return on top of pump and see if it runs ok then. Pump shop will talk you into a complete overhaul of pump and injectors of course. Normally just a few high rate wear parts are needed and new gaskets and seals.
 
Check for junk in the tank. My 1256 and 1066 both have somthing in the tank that gets stuck in the shut off valve at the bottom of the tank. Causes them to bog down and because the pump is causing a vacume it revs up when the fuel goes through. I use a blow gun to blow air up through the tank and it fixes it right up.
 
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