I try to explain this the best I can. Looking at the pump to the left of the hand pump top there is a 13mm bolt with a screw diver slot in it, This is ware you fill and check the level of the oil in that part of the pump. Clean to the left of that bolt and you will find a slash mark with an arrow above it for the fill point, You just fill with what ever oil you use in the engine(I use a pump oil can). Just under and on the bottom is the drain plug (same 13mm as on the side for the fill) for this section of the pump.
For the back section at the bottom by the bolt head that bolts the 2 1/2s together there is a screw driver slotted screw that is the fill point for oil on that side of the pump and is filled with engine oil and the drain is a 13mm under the fill screw fill point under the pump.
These pumps are a piston style injector pump and with the low sulfer fuel the Zetor dealer said to add a pint of ATF or a bottle of 2 cycle oil to 10 gallon of fuel to help with lubrication of the pump. One of the most important things to check on the tractor is the oil level in the injector pump and keeping it full, Its a pain I know to check it but there is a cam in there that drives the pistons in the pump so it has to have oil in it. I hope this information is what you were looking for and if you need more information just give me a shout and I will try to help you out. Bandit
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