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Machine has 3 pumps (not counting those inside the HST). The one on the side of the engine powers just the bh swing cylinders and an extra port with diverter valve (great for a grapple). The front-most pump is for the steering. The main pump behind the steering pump handles everything else -...

Yes, but the swing cylinders are powered by one pump and the boom functions by the other.

diagram from WSM :

Some of the L48s have a self-leveling valve for the front bucket - that has load-sensing and can be set for either open or closed-center operation. Does this machine have it? On my L48 it had been removed and the linkage from the bucket disconnected - WSM has no guidance on testing its...

I've had three of these machines (an L4150 and 2 L5450's). It would help a lot if you could post a few pics of how the hoses are routed and connected now. Normally there are 7 hoses at the valve - and the machine may or may not have provision for more hydraulics out back. There might be...

Since the OP's data points include general weakness in the front loader and the backhoe boom the main front pump's output flow seems the prime suspect. Its either being diverted somewhere or its low at the pump. Lifting the front of the tractor doesn't take much pressure with the backhoe's...

I don't think there would be a leak back there unless the clutch housing is filling with engine oil. The block has a coolant freeze plug up there but I think that would also leak into the clutch housing, not back to the engine sump.

Back to basics - are we sure the oil pressure switch is working? One way to check the actual pressure would be to hold a rubber-tipped compression gauge against the hole for the switch and have a helper turn the key. Even just the starter motor should give some oil pressure with cold oil.

With the pan cleaned out, put a gallon of diesel fuel in the pan and raise it up into position so the sump is submerged put a couple pan bolts in loose to hold it up. Take out the oil pressure switch and with the engine decompressed (head still on?) turn the engine over on the starter and see...

If the front axle and its bracket are removed, the flywheel can stay bolted to the crank flange. There is a shim plate that is clamped between the clutch housing and oil pan - its bolts and studs if any need to come out to allow the oil pan to drop down. The upper clutch housing-to-block bolts...

If your trans oil looks clean and clear (not gray or milky indicating water ingress) then I think there's no need to change it, based on the calendar. Filter changes are good - I like the idea of a shop vac at the fill plug opening to limit the gush.

The starting attempt at about 1:56 shows some spit-back from the #2 intake port. I still think taking the head off may show something with that cylinder - the chambers may have carbon buildup that's interfering with valve seating.

I'd like to compliment your dad's effective repair - pretty clear to me he has a clever and practical eye for things mechanical. Although the clutch face may have become stuck with rust, I think it is still a usable device. The bolts are likely only soft grade 2 material - and can be bent...

I agree the model 1720 loader was a too-quick answer to Kubota's need for a U.S. made loader option on this series of tractors (L305,345, 355). Its bulky and not removable - but on the good side its sub-frame adds a lot of strength to the machine. I don't mean to belabor the point but the...

or you can use a measuring tape and see that the cylinder barrel is about the length of the stroke, but because the upper pin mounting point is so far from the bucket, the retracted rod needs to project from the cylinder enough to reach to it. More modern loader designs move the upper pins down...

Probably very little extra retracting stroke is provided. The stroke of curl cylinders is fixed by how far the bucket pins move from full up to full down. But the top pin is located up at the corner of the boom. So a cylinder is used that has a barrel length long enough for the stroke - but...

Hi Evan, I'm an old L345/L305/L355 fan - always nice to see somebody getting to know one. About those loader cylinders - the 1720 was made in the US so has standard JIC fittings, hoses, etc. - widely available at car parts stores etc. or local hydraulics shops. They have nice end caps that...

If something got in there the shouldn't, it could be hammered into the soft piston and stay there. But that much noise doesn't usually fix itself - and isn't usually benign. Taking the head off is straight forward - just undo the injector pipes and unbolt it. Might be able to see what's...

This may be down the road a bit - but if a piston needs to come out, the job starts by taking away the front axle, a necessary step in removing the oil pan for access to the connecting rods. Bottom-end work on many 4wd models takes significant wrenching for access to the connecting rods. If...

I'm with Wolfman on this - if it continues to run this way it may self-destruct. Looking closer at your vids and pics, its clear this tractor was repainted - and the top of the cylinder head was missed - it still looks like a 40-yr-old Kubota engine. My guess on the hole in the exhaust...