This New Holland T5.120 page lists more than 80 parts for the T5 series. The main groups are trailer couplings, electrics and the cab with its accessories.
With a tractor like the New Holland T5.120, replacement work is less about traditional wear items and more about sensors, hitching and equipment. This page lists more than 80 parts that fit the model, from Scharmüller, GRANIT, Walterscheid, Sauermann and MAHLE.
For the brakes there are brake linings. Always replace them on both sides of the axle together, otherwise the tractor will pull to one side under braking. In the engine bay you will find alternators and a crankshaft seal, and the cab climate system is covered by aircon compressors. When fitting a new crankshaft seal, press it in squarely with a suitable drift and check the running surface on the shaft for a groove worn by the old lip.
Sensors keep watch over the exhaust gases on the T5.120 engine, and NOx sensors and temperature sensors are available for this tractor. If the display shows an after-treatment fault, read the fault code before ordering anything. A loose plug or a chafed wire can trigger the same warning as a failed sensor. Start a new sensor by hand until it seats and only then tighten it with a spanner, so the thread does not cross.
At the rear you can choose from drawbars, top drawbars, an automatic hitch, Piton Fix couplings and adapter plates, so the T5.120 can be set up for trailers with a ring hitch as well as implements with a swinging drawbar. When switching systems, measure the rail and check which coupling pin the new hitch requires. Cylinders, a spring for the mudguard, pivot hinges and hydraulic lifting parts round off what fits this model.
Check the serial plate for T5.120, because the T5 range contains many similar models. The old part usually carries a reference number, on sensors often printed on the label attached to the cable. Hold that number next to the details listed with each part here to see whether they match. With an alternator or aircon compressor, look closely at the pulley and the plug as well, since that is where versions tend to differ.
The other T5 tractors each have their own page with the parts that fit them.
Every other model from the brand is listed under New Holland parts.