Mahindra doesn't use a DPF (diesel particulate filter) to meet Tier IV emissions, they spent $30 million to redesign the engine so it meets the requirements. No DPF means no regen or emissions related issues down the road.
Regarding tractor size, how much PTO HP do you need?
TractorNH, Which Mahindra dealership do you own?
Old thread, but just reading through it now.
I find it very interesting how Mahindra markets their "mCRD technology" like it's at the forefront of emission control, when actually it's just a cheaper way to meet Tier IV Final. Mahindra implies the competition (namely Kubota and JD) don't use high pressure common rail fuel injection, but of course they do. In fact, "mCRD" simply stands for Mahindra Common-Rail Diesel. All tractors that use a DPF like Kubota and Deere also use high pressure common-rail fuel injection like Mahindra.
Mahindra uses a stand-alone diesel oxidation catalyst (DOC) to control CO, HC, and PM. A DOC is basically a catalytic converter specific to diesel engines. The DOC has limitations - it does not start working efficiently until it has reached about 400 degrees F, and after 750F the catalytic reaction includes the production of harmful sulfuric acid which is released to the atmosphere. DOC's attempt to oxidize particulate matter (PM) and at peak efficiency can burn off 70-80% of PM.
Now competitors like JD or Kubota that use a DPF are indeed also using a DOC. However, the DOC is configured a bit differently since oxidizing PM is no longer a primary function. Rather, the DOC still converts CO and HC but is used to generate heat to support the DPF. During a DPF regeneration cycle, raw diesel fuel is combusted inside the DOC in order to oxidize soot in the DPF.
What Mahindra says about a DPF requiring much more complexity as far as pressure and heat sensors, operator involvement, and possibility of failure or simply scheduled replacement is generally true. However, what they fail to point out is that the DPF system is much more effective...greater than 95% of all PM is captured compared to the 70-80% of a DOC only. Furthermore, a DPF is fully effective at capturing soot immediately upon engine startup when EGTs are cold, unlike a DOC-only system. So while their DOC-only system does meet EPA Tier IV final standards, it does so "just barely" while the DPF-equipped tractors well exceed the minimum requirements.
Mahindra tries to tout their "$30m investment into new clean engines" while "competitors just bolted on a DPF" as if they did something wonderful. The truth is that Mahindra's then-current engines were mostly old, mechanical indirect injection engines that could never meet the new EPA standards while the competition was in some cases already using common rail, or at the very least, mechanical direct injection. Mahindra invested in their engines because they had to, but elected to take the cheapest and least efficient path to gaining T4F certification.
One last point - if DOC was such a better solution, why does Mahindra suppose Kubota, Deere, Kioti, and the rest have not tried it? Especially considering they are running much more expensive and complex emissions systems, yet already have all the hardware needed for DOC only? And why do they suppose the on-road diesel cars and trucks universally run DPFs in addition to DOC (and SCR)? The answer is because DOC-only cannot meet the more stringent on-road emissions standards, and off-highway equipment manufacturers like Kubota and Deere are simply future-proofing their product. In the process, they are also making cleaner machines for the environment and for the operator.