texasjohn
Super Member
I'm looking for ideas to try a fix.
I used the tractor for a couple of hours with a drag disk turning over the ground with no problems. All was working dandy until symptoms developed suddenly during this operation. Disk has been removed, symptoms remain.
symptoms:
Grand L5030 with nearly 1000 hours starts easily
idles perfectly, running smoothly
throttle lever will perfectly increase RPM's smoothly and quickly from idle to 3000 or more, no problem even when throttle is very rapidly moved from idle to high RPM'S.
HST transmission pedal will move tractor forward as long as only very slow speed is requested. This is true for L or M or H range. At an early point, if pedal is depressed much, the engine chokes down, slows, almost dies. This is true at any initial RPM "no load" speed, including 3000 RPM. However, backing off of HST quickly results in fast recovery of RPM's to the "no load" speed.
working hypothesis: seems that under load (simply moving tractor at much speed with no implements attached) insufficient fuel is being delivered to maintain RPM's thus RPMs drop rapidly
Trouble shooting completed:
Air filter checked, perfect shape, no dust, no restrictions.
fuel filter bowl cleaned and filter replaced (twice), although no problem found
gravity fuel flow into fuel bowl is sufficient/unrestricted.
Complete grease, fluids, filter service done personally about 6 hours before problem appeared. All fluids double checked and full, no change since service.
Diesel fuel all from same tank, several hours used before problem appeared.
Physical link between HST pedal and transmission is unrestricted and operates smoothly.
I have work shop manual. Assuming there a is fuel restriction, the next thing beyond the filter is the fuel pump, then the injection system. These are items for the dealer to look into and that is my next step unless someone has an idea of something else to try.
Anybody have any other ideas??
I used the tractor for a couple of hours with a drag disk turning over the ground with no problems. All was working dandy until symptoms developed suddenly during this operation. Disk has been removed, symptoms remain.
symptoms:
Grand L5030 with nearly 1000 hours starts easily
idles perfectly, running smoothly
throttle lever will perfectly increase RPM's smoothly and quickly from idle to 3000 or more, no problem even when throttle is very rapidly moved from idle to high RPM'S.
HST transmission pedal will move tractor forward as long as only very slow speed is requested. This is true for L or M or H range. At an early point, if pedal is depressed much, the engine chokes down, slows, almost dies. This is true at any initial RPM "no load" speed, including 3000 RPM. However, backing off of HST quickly results in fast recovery of RPM's to the "no load" speed.
working hypothesis: seems that under load (simply moving tractor at much speed with no implements attached) insufficient fuel is being delivered to maintain RPM's thus RPMs drop rapidly
Trouble shooting completed:
Air filter checked, perfect shape, no dust, no restrictions.
fuel filter bowl cleaned and filter replaced (twice), although no problem found
gravity fuel flow into fuel bowl is sufficient/unrestricted.
Complete grease, fluids, filter service done personally about 6 hours before problem appeared. All fluids double checked and full, no change since service.
Diesel fuel all from same tank, several hours used before problem appeared.
Physical link between HST pedal and transmission is unrestricted and operates smoothly.
I have work shop manual. Assuming there a is fuel restriction, the next thing beyond the filter is the fuel pump, then the injection system. These are items for the dealer to look into and that is my next step unless someone has an idea of something else to try.
Anybody have any other ideas??