ih 354 weak 3point

i have noticed my 3point has seemed to be weak. it list a bale of hay barely with just my unroller when i was feeding during the winter. the other day i bought a 3pt high lift spear to unload them off my flat bed truck, it will not lift them off the truck at all, lift or tilt. manual says it should have 2300-2400 psi at the test port on the front cover under seat. i have outlets and checked it there and only have 1500psi at around 1600rpm. i think that should be close to same reading as where they say to check it shouldnt it?

i have done put 2 pumps on it over the last 10yrs, first was a used on off my parts tractor and a new cheaper one couple yrs ago that wasnt much better than the used one.

anyone put a front pump on one of these tractors that runs off the crank? im thinking of going that route.

before i do is there anything else i need to check first that might be the problem instead of the pump? going to check the suction filter but dont think thats the problem as i changed it couple years ago and flushed and cleaned the hyd reservoir while it was apart.
 
hooked a gauge up under the seat to where it says to and got 1750psi there. took inspection plate off and unscrewed the relief valve,spring looked fine and exactly like my parts tractor spring that i took apart. it had 4 shims in it already, i done some math and made me a shim out of a washer that i ground down to smaller diameter to fit in the housing and put it all together and was right on the money at 2350 psi. but it still doesnt lift the bale of hay with the high lift. am i just asking to much of this little tractor? im trying to lift 5x5 dry hay bales off my flatbed truck. it will tilt it fine but will only lift it couple inchs off the ground and pretty much none off the truck. i can tilt it enough to pull it off the truck and it holds the weight fine.
 

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