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Read articles →Focuses specifically on increasing loader lift capacity on Kubota L-series tractors (L2501, L3902) by shimming the hydraulic pressure relief valve. The owner walks through checking factory PSI with a gauge kit from JailbreakYourTractor.com, calculating shim increments (1mm ≈ 40 PSI), locating and accessing the valve on an L3901, and then confirming the result by lifting until the rear tires break ground. Best for L-series owners frustrated by limited lift who want a practical, measured approach rather than theory.
An owner-operator documenting hands-on work on their own homestead property, so expect a first-person, learn-along perspective rather than professional mechanical instruction.
About 1,100 to 1,350 pounds at the pin, with less capacity the further forward of the pin you load, such as attachments like pallet forks.
Check hydraulic pressure with a gauge kit, then add shims to the pressure relief valve under the loader line block, since 1mm of shim adds about 40 PSI.
Kubota literature lists the L3901 maximum pressure as 2,346 PSI, and the tractor was originally measured at only about 2,200 PSI before shimming.
Yes, after shimming to about 2,500 PSI the rear tires broke ground while lifting at idle, something the tractor had never done before.
