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Read articles →This isn't a product overview but a hands-on hydraulic-pressure experiment using a Kubota B2650/B3350 with a gauge plumbed into the grapple's third-function circuit. Essex demonstrates baseline relief pressure, then shows real psi spikes (2,400 to over 6,500) from improper grapple technique like yanking stumps and logs, plus explains check-valve protection on premium grapples. Best for owners wanting to understand hydraulic strain and avoid damaging their system, not for spec or buying research.
Posted by the Messick's Farm Equipment channel, a dealer, though this video leans educational rather than sales-focused.
Relief pressure is generally in the neighborhood of 2,600 to 2,800 psi, under 3,000 in most cases, which is what the hydraulic pump is rated to build before stopping.
Yes, yanking a log spiked pressure to 3,864 psi and pulling a stump spiked it to 5,634 psi, over 6,500 psi in testing, well above the 3,000 psi hose rating.
FFC, a Paladin company, builds a manifold with a check valve on the back of their grapples that vents fluid from the cylinders, protecting the machine from hydraulic shocks.
Closing the lid over an immovable stump or log and pulling or yanking it, or lifting off-center loads that push the grapple lid open, causes pressure spikes.
