handymantim
Member
Can someone with a shim please post a picture of it and also measure the diameter and post that? Do the shims have a hole in the center (like a washer)? If so, what is that diameter? Thanks.
Bump up lift capacity of L3400/LA463 Loader
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LD1
Epic Contributor
Most just use a #10 machine screw washer. Looks just like any other washer.
Put a gauge on it first. And make sure you dont over do it.
Put a gauge on it first. And make sure you dont over do it.
houser52
Gold Member
I've had my L3600 with a LA680 loader for about 20 years and have always felt like the loader should perform a little better than it does. Everything operates just fine but it never has felt like it lifts as much as it's capable of lifting.
I read through this thread last night and there's lots of good info. I have decided to find a gauge, check the pressure and see what it actually is. My loader manual says that the max pressure is 2490#.
When I check it, if the pressure is low and if I wanted to increase the pressure to safely gain some lift capacity, what would you all recommend setting the pressure at?
I read through this thread last night and there's lots of good info. I have decided to find a gauge, check the pressure and see what it actually is. My loader manual says that the max pressure is 2490#.
When I check it, if the pressure is low and if I wanted to increase the pressure to safely gain some lift capacity, what would you all recommend setting the pressure at?
bumperm
Veteran Member
As a general rule, it is probably best to not set the pressure relief valve to more than the high side of what the factory recommends. But, some would say that there is a safety margin designed into the equipment (we are talking metal structure, pivots, cylinders etc. and that this safety margin should be at least 10% or more. So going a bit over max. is "probably" safe . . . but arguably not as safe as sticking with the factory specs. For sure they want to advertise as much capacity as they reasonably can, but they also don't want a bunch of warranty failures and bad press. So factory specs are usually pretty good on balance.
As to washers and sizes. Guess that depends on the tractor, but for Kubotas, as LD1 says, #10 machine screw washer works. The OD and thickness is what counts, OD to fit, thickness to change spring pressure. ID hole size doesn't matter, the shim could be a round blank as the washer only serves to further compress a spring against a ball or similar valve. I just gathered up a selection of washers, trying to get varying thicknesses from my washer collection.
As to washers and sizes. Guess that depends on the tractor, but for Kubotas, as LD1 says, #10 machine screw washer works. The OD and thickness is what counts, OD to fit, thickness to change spring pressure. ID hole size doesn't matter, the shim could be a round blank as the washer only serves to further compress a spring against a ball or similar valve. I just gathered up a selection of washers, trying to get varying thicknesses from my washer collection.
houser52
Gold Member
I've done a little more digging since my last post. Now I don't know if the pressure can even be adjusted with shims on my particular loader. I don't even see a fitting/nut on the bottom of my valve that looks like it houses a spring or anything.
LD1
Epic Contributor
Probably not on your valve. Most arent. They are on the main manifold where the filter is located.
houser52
Gold Member
You are right the manifold is what I meant to say. I don't think there are shims at the manifold. I read where pressure is determined in the tractors main hydraulics and is not adjustable at the manifold.
Maybe someone can join in who has a tractor/loader like mine.
handymantim
Member
For the others like myself who don't know the size of a #10 washer, here you go.....
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mike69440
Elite Member
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- Jun 2, 2005
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- Tractor
- 2005 L39 Kubota, 2020 Polaris 570 Sportsman, 2006 RTV 900, 2019 RTV1100C, 1997 Komatsu PC75UU2E w/ Thumb & Blade, 2013 Mahindra Max28XL Shuttle plus many attachments
2600 Psig max, If you add a cushion Accumulator to soften surges, 2750-2800 Psig. Add Weight to rear.
ritschner
Silver Member
On the basic L-series it is adjusted under the right floorboard where the loader hoses enter the main hydraulic circuit. The relief valve is on the bottom side of block. As far as washers for shims, I prefer stainless steel as they are slightly thinner. I have also been running 2700psi on mine since 2008 with no issues, spec is 2347psi for my particular tractor. Never exceed 3000psi.