The design is almost ergonomically perfect. The execution is good but a lot of sensor parts are marginal and it is obvious that it was not tested in the field enough. The most basic problem is that you have to rely 100% on your local dealer since there is ZERO contact possible with the parent company. I tried and even my pleading Email came back to me through the local dealer that has no trained mechanic or ANY capability to connect to the computer to interrogate codes or update the software.
My main problem has been sensors especially hydraulic pressure. But there is a sinking feeling when that red STOP ENGINE light comes on. I have even had it come on RED when a suction pressure on the hydraulic prefilter is too low. The manual indicates that this should be only a YELLOW WARNING but the tractor gets parked in the field for a couple of days again until I can deal with it. Forget the dealer, I have to get a local genius has learned almost all makes of tractors on his own. The mismatch between the operator manual and the real tractor reaction to trouble codes has caused unnecessary downtime and losses that I can not forgive. I have tried to get the software updated but I virtually have to flatbed it 500 miles. One chronic sensor I solved myself. I finally realized that AC condenser water was falling right on the sensor and giving false readings so I silicone the non-waterproof connector. I look at the Internet and find there is a new waterproof connector on the NEWER TS135A's but there is no bulletin available to inform me. And these bulletins can only come through the local dealer who does not have the time so I learn the hard way.
Now I have a problem where the power randomly goes to 30% and gives no codes. This happened fall 2009. The dealer can not handle it and the owner has no access to the computer innards. The software tool is proprietary so I am out of luck unless a code gets thrown or flatbed it 500 miles. I am staying a mile away from any diesel that has common rail injection with a computer and no means to interrogate or troubleshoot it. It is like being blind when troubleshooting.
It is a great tractor when it works but you need lots of support to keep it running. The loader is also frustrating in that it was to be self-leveling. It is not like it should be and I am sure that is one reason NH went to the Quicke loader 3 years ago. Must have assigned the loader design to junior engineer that reinvented something that was perfected 25 years ago.
I have a brand new Kubota M125X for two years with no breakdowns but I know the axles are only half the capacity of the NH. Kubota is strictly a haying tractor for me and no cultivation unless you use a very narrow implement.