2015 L4701 HST reduced power when moving

[Kilter Homestead]

New to forum, grateful for finding this. If there is another post with this problem please feel free to direct me to it. Have a 2015 L4701 4wd hydrostatic with backhoe and front end loader. 600 hrs. All services up to date. The other day I noticed a reduction in power when moving forward or in reverse. Motor seems to be running fine(no sputtering or stalling) and all of my hydraulics for loader and backhoe seem to be operating properly. When I step on the “go” pedal it’s takes off very sluggish and can barely get out of its own way never mind push or pull a load. Doesn’t seem to change whether I’m in 4wd or 2wd. Shifting into low gear doesn’t seem to help the problem. Filters are all new within the last 100 hours or so. All fluids are full. Seems to run a bit better when the tractor is cool and not up to full operating temp but not by much. Don’t see any leaks. HELP!

 

[BAP]

Is the parking brake on?

 

[TheOldHokie]

New to forum, grateful for finding this. If there is another post with this problem please feel free to direct me to it. Have a 2015 L4701 4wd hydrostatic with backhoe and front end loader. 600 hrs. All services up to date. The other day I noticed a reduction in power when moving forward or in reverse. Motor seems to be running fine(no sputtering or stalling) and all of my hydraulics for loader and backhoe seem to be operating properly. When I step on the “go” pedal it’s takes off very sluggish and can barely get out of its own way never mind push or pull a load. Doesn’t seem to change whether I’m in 4wd or 2wd. Shifting into low gear doesn’t seem to help the problem. Filters are all new within the last 100 hours or so. All fluids are full. Seems to run a bit better when the tractor is cool and not up to full operating temp but not by much. Don’t see any leaks. HELP!

Any warning lights or error codes showing on the display? Sounds like you might be in some limp mode.

Dan

 

[Kilter Homestead]

Is the parking brake on?

No, that’s kinda what it feels like though, only worse. Checked to make sure it wasn’t stuck.

 

[Kilter Homestead]

Any warning lights or error codes showing on the display? Sounds like you might be in some limp mode.

Dan

Nothing showing on the display. No warnings or anything.

 

[MOOTS]

Shot in the dark here.
Check linkages from treddle to transmission. Had a F mower at work acting the same, had a big ass stick shoved in there.

 

[Kilter Homestead]

Shot in the dark here.
Check linkages from treddle to transmission. Had a F mower at work acting the same, had a big ass stick shoved in there.

I will check later. Thank you!

 

[North Idaho Wolfman]

Who did the service?
Where all filters changed?
What hydraulic fluid was used?

 

[Kilter Homestead]

I will check later. Thank you!

Checked for obstruction in the linkage. Nothing there.

 

[Kilter Homestead]

Who did the service?
Where all filters changed?
What hydraulic fluid was used?

I did the services per the manual. All Kubota brand filters and fluids.

 

[North Idaho Wolfman]

I did the services per the manual. All Kubota brand filters and fluids.

OK, But what fluid, Kubota has many!

 

[PaulL]

Did the problem start after the service, or not really near the service?

Question is whether it's engine load (fueling, air etc), or transmission (fluids, pump etc).

One way to find out is to load it without transmission - so load the PTO perhaps and see if it also bogs under PTO load.

If it's the engine bogging under PTO load, then you'd be looking at fuel filters, air filters, fuel pump etc.

If the engine seems to handle load fine (via PTO), then you'd suspect the transmission as the cause. Low hydraulic fluid would be the obvious one, but you've checked that. So that leaves blockages, filters, or something more major wrong with the transmission itself.

 

[MOOTS]

Checked for obstruction in the linkage. Nothing there.

It was worth a shot!

 

[lugbolt]

brakes dragging has been something ongoing for a while on the 4701's. I don't know if they were just adjusted too tight or what. I just adjusted the linkages so that the pedal had plenty of free-travel and that seemed to have solved the majority of them.

also if there is/was ever a stage 3.5 or higher dpf soot level, it'll put the engine into lower power (de-rated hp). Usually there are flashing lights and beeping to let you know.

Air filter ok? OEM replacement? Installed the correct direction? Anything in front of the radiator that might have gotten sucked into the air filter housing? Too much oil in the crankcase?

One more thought. If you have a loader installed, does it seem to work ok? Have seen plenty of 3 point hitches with out-of-adjustment feedback linkages, and that will dead head hydrualic pressure resulting in the pump eating up a lot of engine power. Move the 3ph lever down a little and see if it makes more power. If so, adjust the feedback rod.

 

[Kurt Shaul]

New to forum, grateful for finding this. If there is another post with this problem please feel free to direct me to it. Have a 2015 L4701 4wd hydrostatic with backhoe and front end loader. 600 hrs. All services up to date. The other day I noticed a reduction in power when moving forward or in reverse. Motor seems to be running fine(no sputtering or stalling) and all of my hydraulics for loader and backhoe seem to be operating properly. When I step on the “go” pedal it’s takes off very sluggish and can barely get out of its own way never mind push or pull a load. Doesn’t seem to change whether I’m in 4wd or 2wd. Shifting into low gear doesn’t seem to help the problem. Filters are all new within the last 100 hours or so. All fluids are full. Seems to run a bit better when the tractor is cool and not up to full operating temp but not by much. Don’t see any leaks. HELP!

My previous 4701 had the exact problem you describe. Only did it when hot. It turned out to be the PCM. The PCM was falsely detecting a issue with the engine. It turned out to be a bad ground. Dealer wanted to change out the unit, but that wasnt the issue. It was a connection for ground.
Can you check codes?
Look for P0606 code
•PCM wires that are broken, corroded, and/or frayed
•PCM connectors that are broken, corroded, and/or frayed
•Faulty PCM ground circuits and/or output devices
•Faulty Controller Area Network (CAN) bus communication

 

[Kilter Homestead]

Thank you to everyone for the input. I ran through most of what everyone suggested and it didn’t fix the problem. It now won’t move at all so this morning a dragged it onto the trailer and it’s now at the dealer. We will see what they have to say. I’ll let you guys know when I find out what they suggest is wrong.