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vertical shaft engines can have a drain plug underneath, in the side under the filler tube or on the other side opposite the filler tube
or you can drain the fuel out , then tip it on its side and drain the oil out of the filler tube
use an oil evacuation / filler pump to suck the oil out
horizontal shaft --plugs are near the filler tube , use the pump ,or tip it on its side
The engine is designed to cut out after a few seconds without oil pressure.
So you need to establish if it's a faulty signal, or really is low oil pressure.. Low oil pressure could be down to catastrophically low oil level - top it up to the upper mark IN STAGES, 1/2Litre at a time. Choked oil filter, jammed bypass valve, blocked strainer, can also all cause the problem - lack of maintenance? Have you recently used a flushing oil in an old engine?
Also using very thin oils e.g. 0W30, in a very worn engine, will not allow the pressure to build up.
First check for loose bolts, broken gaskets and spacers, then check to see that the choke is operating correctly, if all this checks out, the issue is going to be a bad jet in the carb, try cleaning the carb by soaking it in chemclean or other part soak cleaning solution, just soak the entire carb for about 30 min to an hour and then blow it out and off with compressed air
have you checked the engine oil. most models have an oil motion pick up. they are fitted to most lawn mowers as well when the oil gets week it does not lift and engine will just cut out. replace oil with 20/50 oil.
You have to drop the oil pan . Since it's 4wd you won't need to jack it up. The pump has 2 bolts. The shaft has a slot in it that engages the distributor so when going back with the new one be sure you line up the shaft before tightening the bolts.
are the wheel / axle keys in the shafts ? make sure they are in the shafts with the wheels
provided you have correct tension on drive belt and belt is good and pulleys are all good , and spline on top of gear box input shaft is good not stipped ( as well as the pulley spline )check splines on shaft and pulley carefully
you should have movement of the variable displacement pump in the trans if all is good here ?
sounds like you may have a stuck bypass actuator in the box or the oil level has got low
and needs refilling and bleeding of air
make sure the lever is actually moving the swash plate for the transmission
if trans has a stuck or broken bypass - trans will ned opening up
let your local dealer take a look gearbox job on hydro units are not exactly easy
to fix unless you know what you are doing night pay to let local dealer repair it for you !!!!!!
If it is a vertical shaft engine then it is most likely the crankshaft seal. That requires removing the engine from the frame and removing the pump from the motor to replace the seal. If it is a horizontal shaft engine then it could be either the shaft seal or the side cover gasket. Both require removal of the pump.