Keeping a Hanomag R 12 running takes the right spares. This page lists more than 50 vintage tractor parts that fit this model, so you can skip the guesswork.
Keeping a Hanomag R 12 running usually comes down to two jobs: a water pump that stays dry and gaskets that hold. This page brings together more than 50 new replacement parts that fit this tractor, from makers such as GRANIT, METARO and HELLA. They cover the work an old tractor really needs, from curing leaks to sorting out the cooling and renewing bearings that have worn loose.
You can fit a complete water pump or rebuild the one already on the engine. For a rebuild there is the bearing, the pump shaft, the impeller with its cap nut, a round rubber seal, a Nilos ring, a shim washer and a circlip. A rebuild makes sense when the housing is sound and the only trouble is play in the shaft or a drip from the weep hole.
One piece of workshop advice: always renew the bearing and the seal together, even if only one of them looks tired. A fresh bearing behind an old seal will not last, because escaping coolant washes the grease out. When you press the impeller on, keep enough clearance to the pump housing and tighten the cap nut with feel rather than force. Check the coolant drain valve at the same time. It often sits untouched for years and no longer closes properly once it has been opened, and a replacement is on this page too.
The second theme on the R 12 is sealing the engine. There is a cylinder head gasket set for anyone lifting the head, an oil sump gasket and individual gaskets, for example for the gap-type oil filter. Thrust washers on the crankshaft take up the end float. If the sump is off anyway, inspect them, because excessive end float tends to go unnoticed until the wear is well advanced.
A tractor of this age has often had something swapped or modified over the decades. Start with the type plate to confirm it really is an R 12, then compare the number stamped or cast into the old part with the details shown for the product. With gaskets, lay the old one next to the new one before you apply any sealant. If you are unsure, send us the number from the old part and we will check it with you.
If another Hanomag shares the yard, the rest of the range for this make is under Hanomag parts.