Kubota B9200 HST Loses Power

wildcatman119 · May 16, 2010

Unit runs fine cutting grass for a about a half hour then loses power, almost unable to move.

After a "rest" the unit works again and the cycle repeats.

Any Ideas???

TripleR · May 16, 2010

Is it missing out, RPM's dropping?

wildcatman119 · May 16, 2010

Yes RPM dropping.

RobertN · May 16, 2010

I noticed that on my old B8200. They are pretty much same tractor, but B9200 has a litle bigger motor.

I'm thinking it is getting warm...

With mine, I would mow for about an hour, take a break, and clean the radiator screen. Then clean off the hydro oil cooler, and make sure the grill is cleaned of chafe. I also emptied the air filter dust cap frequently.

Before and after mowing, I used compressed air to blow dust ect out of the radiator fins and the hydro cooler fins.

Becuase of this, I also kept the radiator coolant changed yearly.

GREAT tractors, but I do not think they had the best cooling and dust handling for the motors.

TripleR · May 16, 2010

In addition to that mentioned by RobertN, I would clean/replace fuel filters.

wildcatman119 · May 16, 2010

Where is the Hydro oil cooler screen?

kuboman · May 16, 2010

TripleR said:
In addition to that mentioned by RobertN, I would clean/replace fuel filters.

Change the fuel filter(s). Heat should not make it loose power.

RobertN · May 17, 2010

Mine had a screen in front of the radiator/hydro cooler. The hydro cooler was a small hydraulic fluid radiator right in fron of the regular radiator.

Mine was the B8200; yours may be a little different.

wildcatman119 said:
Where is the Hydro oil cooler screen?

Skyboi01 · Sep 11, 2017

wildcatman119 said:
Unit runs fine cutting grass for a about a half hour then loses power, almost unable to move.

After a "rest" the unit works again and the cycle repeats.

Any Ideas???

After going through the many "fixes" on this forum (pulled and cleaned fuel tank, drain fuel lines and replace rubber tubing, check injectors, check fuel pumps, replace fuel filter) my B9200 continued to surge after about 20' running and lose power. I finally drained the tank and fuel lines again and added new deisel fuel. The engine immediately ran perfectly and has been fine ever since. Don't overlook the easy fixes first. I could have saved myself many hours of work if I had just replaced the fuel first. I still don't understand why it took 20' of running before the loss of power occurred. Bad fuel is bad fuel and should have caused the power loss as soon as the engine was started. However, contaminated diesel fuel was what my problem was.