755 Low power: John Deere Review  -- John Deere Tractors Discussion Forum and Review 755 Low power: John Deere Review -- John Deere Tractors Discussion Forum

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 01-05-2004, 07:53 Post: 73088
John N
2004-01-05 07:53:41
Post: 73088
 755 Low power

755 with 341 hours. It bogs down going up even a slight hill using the mower to the point of stalling without a hint of smoke. Downhill runs fine. I thought it might not be getting full fuel flow. Changed fuel filter. Supply pump OK. Good flow to the injection pump. Injection pump and injectors tested at diesel shop. All excellent. Governor appears fine. Spins up to proper speed, no surging. I have both engine and chassis manuals, everything appears to be at spec. One question is the fuel controller on the back of the governor. There is nothing in either manual that says how to adjust it. Anyone know? Could it be a hydraulic flow problem? Seems like low hours for that. Any input to this puzzler is welcome.






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 01-05-2004, 13:34 Post: 73128
Chief



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 755 Low power

Have you checked the fuel pickup inside the fuel tank for contamination restriction?






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 01-05-2004, 13:35 Post: 73129
Chief



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 755 Low power

Where did you get the fuel you are burning in it now and how old is it?






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 01-05-2004, 15:08 Post: 73136
Johnln



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 755 Low power

Fuel is auto diesel with a little additive for lubrication. Tank is clean. Flow to the inlet of the injection pump is good.






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 01-05-2004, 15:38 Post: 73141
yooperpete
2004-01-05 00:00:00
Post: 73141
 755 Low power

Were you at one time able to do what you are now attempting? Are you in low range running 540 PTO rpm?






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 01-05-2004, 16:13 Post: 73149
Art White



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 755 Low power

How's the hydro working? anything different there? It does worry me as to the fact youaren't getting any smoke out the exhaust as they normally will a little when working hard. You did eliminate that as a sourse of problem by having it checked out.






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 01-05-2004, 16:22 Post: 73151
Chief



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 755 Low power

Does the engine pick up the load if you put the hydraulics into bypass? (i.e. can you here it lug down and smoke more due to the load?) It almost sounds as if the govenor is not properly compensating for engine load. If the engine stalls out under a heavy load you would get tons of smoke if it was. If it was a hydro problem, sounds like the suction filter & screen is restricted but that would not necessarily kill the engine in the manor you are saying.






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 01-06-2004, 05:24 Post: 73204
Johnln



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 755 Low power

This one is strange isn't it? Yes, it used to run up hill, down hill, sideways with no problem. I have not checked anything in the hydraulics as yet. It runs strong downhill and flat, but even the slightest incline bogs it down. But you would still think it would smoke under heavy load unless it was at the power limit of the machine. That's why I'm still leaning toward fuel control. I think the governor is calling for fuel, but a control limiter or something is throttling it. There is that fuel controller on the back of the governor that is mysterious to me. I cannot figure out what it does. Nothing in the manual says what to do about it other than point it out on a diagram. Also, the mower deck does turn freely and easily by hand at the shaft - no binding.






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 01-06-2004, 07:43 Post: 73212
Chief



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 755 Low power

I think the problem may between the pump or governor. Have you run these symptoms by you local John Deere dealer Service Tech? I would do that before I removed anything but I believe both would have to go to a diesel pump shop for repair if there is a problem. The fact that the engine bogs down upon encounter a load without showing signs of fuel enrichment is an indicator of a problem with the pump and or govenor.






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 01-06-2004, 07:51 Post: 73213
wallac



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 755 Low power

yOU HAVE SAID THAT IT DOES IT WHEN YOU ARE RUNNING THE MOWER, HOW DOES IT RUN IF YOU ARE NOT RUNNING THE MOWER?






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Discussion Boards > Active Subjects > Messages as Posted > John Deere Review Forum

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Art White 2 | Chief 4 | John N 1 | Johnln 3 | kwschumm 1 | TomG 1 | wallac 1 | yooperpete 1 |




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