I just got me tractor back from having the 50 hr checkup(L3800), I mentioned to the service foreman with my forks on my tractor would just barely lift 990 lb pallet off a truck. I told him I had read here about adjusting the hydraulics for increase lift capacity ? He said what I read was shimming the pump to increase the presser there for increasing the lift capacity. He checked the PSI was at 2400. Factory spec was 2280-2410 PSI. He installed .3mm of shim . Rechecked the PSI it was at 2515 PSI. A gain of 115 PSI. I'll have to see if I notice any difference moving logs this coming weekend.