Orange part numbers are Amazon affiliate links (we may earn a commission at no cost to you). Specs, intervals and part numbers come from Kubota’s manual and parts catalogs.

Our source is the BX1880/BX2380/BX2680 Operator’s Manual, code K2871-7131-1 (2016), the 2017 brochure and Kubota USA’s BX2680 detailed specifications. Earlier versions of this page said 3.3–3.5 qt of engine oil every 50 hours and a 300-hour transmission interval; the manual gives the figures above. The manual’s CJ-4 prohibition conflicts with Kubota USA’s general lubricant page, which lists CJ-4 for non-EGR engines, so we show both and follow the manual. See our engine oil cross reference.

• Hydraulic oil seeping at the front loader quick-connect couplers
• Loader drifts down or curl feels weak
• Oily residue around the coupler block
• Fluid level dropping between uses

• Clean both coupler faces and reseat the couplers fully
• Inspect O-rings for nicks, cracking or deformation
• Check the fluid level (shared with the transmission, 11.3 L)
• Replace the transmission filter if the hydraulic system was opened (every 200 hours per the manual)

If seepage continues after cleaning, reseating and new O-rings, have a dealer inspect the coupler block. See our quick coupler maintenance guide. Earlier versions quoted repair costs we could not source.

• 4WD lever hard to move or stuck
• Lever will not travel to a detent
• Resistance when shifting

• Follow the manual’s instructions for using front-wheel drive
• Many owners report that creeping forward and then slightly back relieves driveline bind (owner-reported, not a Kubota statement)
• Lubricate the lever pivots and check linkage travel

Front axle oil is a 400-hour service. The manual lists 3.6 L in its table and 4.7 L in the procedure; fill to the dipstick’s upper notch and recheck after ten minutes. We found no Kubota statement on the shifting technique described above.

• Tractor rolls backward after the pedal is released on a slope
• Will not hold on a grade without the parking brake

The manual lists the transmission as hydrostatic with High/Low range. Check the fluid level first, then have the neutral return linkage adjusted per the workshop manual. Replace the transmission filter every 200 hours and the fluid every 400. See our HST transmission guide. The manual also describes an operator-presence test: standing from the seat with the pedal depressed should stop the engine after about one second (p. 81).

• Hitch pops out of float or drops erratically
• Hitch will not hold height under load
• Mid-mount deck height dial will not reach its top position

Start with the rate-of-drop knob (owner-reported fix), then lubricate and check the linkage. Exceeding the lift figures above can bend linkage, so match the implement to the numbers. See our 3-point hitch guide. For towing limits (hitch load 250 kg, trailer load 800 kg, total trailer 1,100 kg per the manual) see our BX2680 weight and towing page.

• PTO lever pops out under load while mowing or tilling
• Delay before the mid-mount deck drives
• Intermittent engagement

The manual lists rear PTO at 540 rpm and mid PTO at 2,500 rpm, with a start interlock that requires the PTO clutch lever off. Adjust the linkage so the lever fully strokes the valve and check the cable for binding. If the lever still will not stay engaged, a dealer should inspect the PTO valve. Earlier versions mentioned an internal Kubota bulletin; we found no such bulletin and removed it. See our PTO problems guide.

• Throttle or 4WD knob works loose or falls off
• Deck lift lever loose
• Knobs wobble before they detach

Remove the knob, clean the shaft, apply medium-strength thread-locker and reinstall. Replace any knob that is cracked. This is an owner-reported pattern; if the tractor is under warranty, ask the dealer to replace the knob.

• Hazard lights stuck on
• Turn signals click but no light flashes
• Intermittent lighting

Spray electrical contact cleaner into a sticking switch and work it. Check bulbs first, then the flasher relay by substitution, then the connectors; apply dielectric grease after cleaning. See our lighting problems guide and electrical gremlins guide. Earlier versions named a Group 51R, 560 CCA battery; we could not source it, so check your manual for battery size.

The manual says “the initial 50 hours should not be a replacement (changing) cycle,” and the first-service symbols could not be read completely, so we do not state a break-in change. Fuel and air filter intervals were not verified.

We found no complete serial split, so confirm by serial at Kubota’s parts lookup or on our parts diagrams page. Earlier versions listed a glow plug and a battery; neither was verified, so they are not shown.

• Any statement in the manual that the BX2680 has or lacks a DPF or DEF; the manual places it under “except external EGR.” We make no “DPF-free” claim.
• Why the manual and brochure disagree on horsepower (25.5 vs 24.8) and kilograms (690 vs 670).
• Which front axle capacity (3.6 vs 4.7 L) is correct.
• Assembled tractor-plus-loader or mower weight.
• Whether this manual governs every later BX2680-1 or D-1 serial number.
• Owner-reported patterns, costs and bulletins from earlier versions, which we removed.