I am getting ready to order 3rd function kit for my L2800. Can get the kit from Summit for approx $600 on sale this weekend, but would have to source the hoses separately . Or I can order kit with my grapple from EA for $970 which would include the hoses. For those who have already done this, which choice makes the most financial sense or is it a toss up?
3rd function kit
- Thread starter STEVESC
- Start date
If you have a fair priced hydraulic shop near you, you might want to get the kit with no hoses and then measure carefully to get hoses that are routed where you want them. I didn't use the hoses that were with the kit because I chose a more protected route using a great shop in my area, of course we don't know where in the USA you live.
trikepilot
Well-known member
Equipment
B2620HSD LA364/BH65 48SQ Bush Hog LP FDR1660 LP RB1560 B2672 42in forks LP1266
try https://www.discounthydraulichose.com/
I did all the fittings and hoses for adding front and rear aux hydraulics for a fraction of the cost of either of my local shops. They are easy to work with and I got fast shipping (PA to VA) that did not slow me down on the install.
I did all the fittings and hoses for adding front and rear aux hydraulics for a fraction of the cost of either of my local shops. They are easy to work with and I got fast shipping (PA to VA) that did not slow me down on the install.
I don't know of a kit. Do you want the thumb, hydraulic valve, or both?
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Adding the hydraulics is easy and not particularly expensive - just a "third function" for the hoe. The thumb is something else.
Dan
I have the Summit kit on my LX2610SU. It's about 3 years old, and I've had to replace one of the microswitches in the control knob. (Strike 1) I've had intermittent problems with it for the past year, but no time to diagnose and fix it. Because of the failure (randomly closing the grapple) I did a little research on the switch and found out they were rated 1A NON-reactive at 30VDC. I haven't checked the current on the solenoids on the valve, but I can almost bet it's going to be higher than 1A at 12VDC. That said, the kit comes with switches that are underrated. Solenoids are VERY reactive devices and will toast a set of contacts that don't have any kind of arc suppression. I found exact replacements for the switch from Amazon and got them in 2 days, but not without some risk to my tractor. I now have 4 more replacements. I pulled up on the lever to raise the mower, and it didn't budge. Turns out the valve was stuck on and stalling the hydraulic circuits because the valve provided in the Summit kit is NOT a power beyond valve. (Strike 2). I thought I'd found the problem at one point when I found that the plastic nut that holds the bottom solenoid on had fallen off and the solenoid was nearly gone with it. I made a new nut with aluminum and solved the problem.
One more little problem with this Summit kit and I'll probably be getting a Kubota kit. I can't risk burning up the hydraulic pump in my tractor because a cheaper 3rd function option fails.
None of these kits including Kubota use a vakve with power beyond and even if they did it would still stall your mower, 3pt, rear remotes, and boom on the loader. So strike strike 2. The pressure relief valve is what protects the pump in situations like that.
Dan
There's gotta be some better plumbing design, or a better valve. The loader doesn't stall everything and the 3-point certainly doesn't stall everything. The herky jerky crap when I'm tapping the 3rd function to close the clamp and lifting at the same time is annoying. Instead of putting the 3rd function valve tank port in series with the PB from the loader, perhaps the smarter idea would be to put it in parallel so that it does not affect the loader at all. I've seen some multi-function kits that stack the banjo bolts for the tank return which makes a lot more sense than letting one valve shut down the entire hydraulic system of the tractor. The PR just protects the boom on the FEL. I read far too often about people bumping up the pressure and breaking things. I'm pretty sure what I read about the Kubota valve said it does have a relief that prevents it from stalling the FEL boom and curl functions. That could have been wishful thinking though.
Oh yeah, the PR protects the pump but does very little to protect the hydraulic oil. That's where all the heating comes from. The lines to the 3rd function valve were EXTREMELY hot by the time I figured out what was going on. That can't possibly be good for the oil. It isn't discolored or stinky, though.
I think yoi need to refresh your understanding of open center hydraulics.
- With or without PB a stalled cylinder stalls all downstream devices and that includes the loader valve
- A relief valve prevents over pressure upstream of a stalled cylinder but it doss not prevent stalling down stream devices.
- Operating any directional valve cuts off the neutral circuit supply to diwn stream valves. They are dead in the water untill the valve returns to neutral.
- Exceptions to 3 are the 3rd function valve and the boom spool on the loader. They are serial valves and pass return oil from the cylinders to neutral rather than tank. That puts the cylinders in series with the downstream device which allows them to operate in tandem but the loads are combined and if any one load stalls they all stall.
- Kubota 3rd function kits use the same D03 valves used by everybody else. NONE of them have a power beyond circuit. A very few have an inlet pressure relief that is essentially worthless given the tractor relief has priority.. And as I said in (2) a pressure relief does not prevent stalling the neutral circuit.
Dan
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