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722DT6 stalls when try to engage mower

#1

D

dmwmbacpa

Model 722DT6 ser 5818060 943 hours
3 cyl Kubota
Just got it running. New injectors; head ; fuel pump : fixed drive pump issue (replaced shaft and gear, new seal,filter,etc)

It is (was) a beast - motor runs great, pulls great, mows great for one day

New Issue just started - a little hard to start and when I engage the motor it stalls out. Like a huge load put on mower. Just chokes it right down


#2

D

dmwmbacpa

Troubleshooting. Bypassed seat safety switch. No effect.

Turned blades by hand. They spun freely. Motor sounded like it was missing although that is hard to tell on a diesel. So...loosened fuel line on first injector and motor died. Tightened it and loosenedsecond injector...no effect...so no fuel to second injector. Loosened third injector and motor died. So diagnosis is a bad fuel pump. Ordered new pump and gasket. $110. Fingers crossed.


#3

cpurvis

cpurvis

It can get expensive to throw parts at a Kubota diesel. Do a search on here for another diesel Grasshopper that had similar problems and it turned out to be grass clippings in the fuel tank.


#4

S

SHB

dmwmbacpa said:
Troubleshooting. Bypassed seat safety switch. No effect.

Turned blades by hand. They spun freely. Motor sounded like it was missing although that is hard to tell on a diesel. So...loosened fuel line on first injector and motor died. Tightened it and loosenedsecond injector...no effect...so no fuel to second injector. Loosened third injector and motor died. So diagnosis is a bad fuel pump. Ordered new pump and gasket. $110. Fingers crossed.
Click to expand...
Did you get fuel out of the line to the 2nd injector when you loosened the fitting? If you got fuel, may be a bad injector. Could try swapping injectors to see if problem moves.


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