John Deere 5125ML to 6155M specifications

Low-profile ML equipment and early 6R choices

The 5125ML serves a different clearance problem from the cab tractors in this comparison. Deere’s February 2019 order book describes an isolated open platform, inboard controls, a low-profile seat and steering wheel, and a folding two-post ROPS. Its steering is hydrostatic power steering.

An earlier “manual” entry therefore does not describe that documented configuration.

Transmission choice also changes the ML’s hydraulic requirements. The listed PowrQuad packages require pressure-and-flow-compensated hydraulics, electronic hitch controls and the three-speed rear PTO. A creeper package and the regular PowrQuad are separate selections.

An orchard buyer comparing used machines should identify the installed transmission and hydraulic controls together; the ML suffix alone does not settle attachment compatibility. Deere specifies DOC/SCR aftertreatment for this Final Tier 4 engine. That description belongs to this edition, not automatically to every older Deere diesel.

Why a 6115R or 6125R needs its original option list

The early European 6R brochure places the 6115R and 6125R on the compact chassis with four-cylinder engines. It distinguishes ordinary rated output, maximum output, and output with Intelligent Power Management. A boosted rating cannot replace the ordinary rating without its condition.

That brochure’s transmission matrix matters more than a general description of the 6R range. It offers PowrQuad Plus, AutoQuad Plus and AutoPowr on these two models, but its DirectDrive cells are blank. The double-clutch transmission discussed elsewhere in the brochure is not evidence that either compact model has it.

AutoQuad supplies automatic gear changes; PowrQuad still requires the operator’s gear selection.

Cab suspension also affects the published fuel-tank specification. Deere gives different capacities with and without HCS Plus. Compare a seller’s tank claim with the suspension package before treating the difference as an error.

The early Stage IIIB specification identifies DOC/DPF filtration; it should remain separate from the later ML’s DOC/SCR description.

Reading the 6155M test without mixing power conditions

Nebraska Summary 1112 covers a twenty-speed PowrQuad Plus 6155M tested in Germany. Its maximum PTO result is 146.7 hp at 1800 engine rpm; the rated-engine-speed result is 131.8 hp at 2100 rpm. Those are different points on the same test, not competing engine specifications.

The reported 119.5 hp drawbar figure belongs to the rated-engine-speed test in seventh gear. The separate selected-gear results reach 132.9 hp in eleventh. Calling 119.5 the maximum across that entire report would hide the test condition.

Keep both results and their labels when judging a tractor for a draft job.