L6060 Reducing RPMs

Mikec575

Member
Jun 30, 2023
60
7
8
Texas
I’m having an issue with my Kubota L6060 HST and wanted to see if anyone else has experienced this.


When mowing with a brush hog at around 2500 RPM, the tractor will suddenly idle down to about 800 RPM while I’m moving. If I let off the HST foot pedal, after a couple seconds the engine throttles itself back up to 2500 RPM and runs normally again.

A few details:
  • Fuel filter and water separator filter were both replaced about 31 hours ago
  • Stall Guard is turned on
  • There are no warning lights or codes showing other than the normal PTO and Stall Guard lights
  • From my understanding, Stall Guard should reduce travel speed/load on the HST, not actually drop engine RPM that drastically
Has anyone run into this before or have ideas on what to check next? Possible fuel issue, sensor, regen-related issue, or something with the HST/Stall Guard system?
 

SDT

Well-known member

Equipment
B1750 with MMM. Everything else sold prior to relocation.
Apr 15, 2018
3,627
1,350
113
Montana
Confused regarding symptoms.

Overloading engine?

Turn stall guard off and try again.