Hydraulic Problem – please help Luzhong 254

That sound is your pressure relief valve popping open, preventing the hydraulic pump from deadheading. There are no hydraulic motors on these tractors. Did this sound just start happening? It happens when the spool blocks both ports in the valve. Don’t hold the valve in that position, pass through it quickly. If there are detents then it could be a simple linkage adjustment.

Did the dealer you purchased it from perform a pre-delivery service? This issue should have been caught then. You can try adjusting the linkage but I’m not sure if that would help. I’m not that familiar with the wheeled tractors, so hopefully someone that is will chime in shortly. I’m told that there may be a valve under the seat that has something to do with the three point hitch lift.

Hahaha. You still have it wrong. Pump, not motor. No hydraulic motors on these tractors, but they do have hydraulic pumps. The fact that the relief valve is squealing is proof that it’s functioning, although it may be set too high if it tries to kill the engine (depending on engine speed). It may well kill the engine if it’s only idling.

Veggie wrote:

I imported the tractor from the manufacturer in China. This issue is part of my pre-delivery inspection being done by myself. All fluids have been changed and fasteners tightened. This hydraulic issue seems to be the last remaining issue. However, if not solved I could find myself with a cracked PUMP casing. Veggie

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This is one of the inherent problems of self-importing. Reputable dealers have the knowledge, parts, and expertise to correct these issues. It’s a small price to pay for that assurance. It’s not likely your pump will fail as long as the pressure relief valve is functioning properly, however that is like playing Russian roulette. You might have to replace that valve. If there is a part number on the valve you might contact one of the dealers that support this site or the manufacturer where you purchased it to see if they have a replacement, or can help you further. Sorry, wish I could help you more.

Video doesn’t show very well, but I will guess that the nut on the end of the rod connected to the lift lever, has to be adjusted so the lever can’t go beyond a preset position, which would stop the problem you are having. Try adjusting nut inward so that it prevents you from raising the three point too high. The inner adjustment would give you a preset level on the three point, with implement attached. I have no experience with that tractor, so proceed with caution.

you might want to consider placing a pressure gauge in the system somewhere on the high side to verify that the noise is because of the over pressure release valve is cracking open.