Congrats on the tractor. Lets see... if it is a side mount it is late 50 or later. The serial number is on the left side of the block kinda to the right of the oil canister, and above the starter. You can check the number against a list here, on the left side. Also, you might want to get a I&T FO-4 manual.. get them here, or many online dealers.. or even New holland dealer,, or even TSC stores. Most of us use a sae 30wt oil for the engine.. but there is a good amount that also use multi vis oils.. like 15/40. The mc1-134d oil is the new NH spec for the tranny/rearend/hyds.. though some of us still use the original spec 90wt gl-1 mineral oil... get it at TSC, etc. The clutch that you heard of is commonly called an over running coupler.. etc... it is a one way ratchet.. lets the pto power the impliment.. but when the impliment speed is higher than the tractor, it freewheels.. so you can actually use your clutch and break to stop.. otherwise that inertial power is fed back thru the pto to the final drives.. etc. Road gear ( 4th gear )..is well.. pretty fast.. I'm guessing 14 - 16 mph at full throttle... just be carefull, and don't make sharp turns. or expect to stop on a dime... remember it is an old tractor.. no rops or seatbelt.. and marginal brakes. I mow in 1st gear. Ther eis some discussion that 2nd gear is a weak gear, due to being used for plowing, etc... I don't know the 'real story' .. I just use 1st for mowing.. besides.. the 3-4 mph is fine.. lets the tractor cut it without grunting too much. As for fuel.. if the tractor is in good condition.. I would guess around 8 hours.. maybee more maybee less.. depends on the specific work, etc. If you have the original fuel sediment bowl, there is usually a 1 gallon reserve that you get too by opening the fuel knob a few more turns. Tips... well... be carefull The brakes usually arent the best... don't pull heavy loads that are attatched to anything higher than the th elow point of the rear axle .. the tractor will/could flip and kill you. Change your oil inthe air cleaner every day, and service the old girl regularly.. remember to hit some grease in the zerks once in a while.. manual says every 10 hours.. but I imagine you can extend that a little. Remember to put a drop of oil in the side oiler cup on the distribuitor, and the generator endplat oil cup. ( The distribuitor has a wick for the oil.. if yours hasn't been oiled, hit it with some pb bnlaster or wd40 to get it soaked.. then oil as normal. ) Change your oil every 100 hours or once a year.. get a good filter.. a phram c3 or c3p is a good number to cross to / from.. and use the new oil can gasket that comes with it.. even if your old one looks ok. Other stuff is just basic love and care.. etc. Also, lube your steering gears and top bearing onthe steering shaft. There may be a screw on the steerring shaft to drip some oil in for the top bearing, and on the right side, there will be a bolt that may go through the battery box, on the upper right side of the steering box... pump some 80w90 or 140 weight ger oil in there... if it leaks out the sector arms.. your bushings and seals are old.. keep an eye on it. If you are lucky, you might have a late model with some easy adjustment for backlash on the steering sectors.. if so, you will see a slotted headed stud on either side of the steering box.. that is used to adjust play out of the steering. Good luck. If ya got more questions, ask away! Soundguy
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