Diverter Valve troubleshooting

[xanadu1797]

Hi everyone,
I'm trying to get some insight into what is going wrong with my Kubota B26. I had my mechanic install diverter valves in the front and rear of the tractor to accommodate a grapple and a hydraulic thumb. Since then a couple things keep happening

In the rear the backhoe spool valves (which had been rebuilt a few years ago) started leaking and one of the outriggers operates very slowly. It's been already repaired once, and then began leaking again.

In the front- when using the diverter valve to operate the grapple the boom cylinders sort of pinch down on the left side when closing the grapple fully. Now the boom cylinder (also recently rebuilt) is leaking. I chose the boom cylinders for the diverter valve because of the regen function on the curl circuit.

Are these diverter valves blowing my seals? Could this be pointing to the relief valve not operating properly?

 

[oldnslo]

What type of diverter valves do you have and where are they plumbed in the circuit. If installed correctly a diverter should not have any effect on seals or how back hoe valve functions.

Some pictures of the valves installed might help.

 

[xanadu1797]

They're surplus center solenoid diverters. 6 gpm
Not sure if pictures will be very useful but the forward valve is mounted beneath the right floorboard and is connected to the boom circuit. When the grapple closes fully it squishes down the left side of the boom. Doesn't look right but I don't think it's hooked up incorrectly.
The rear valve is plumbed in by the three point hitch.
I checked the breather tube- that's clear.

 

[zzvyb6]

From my experience, you have 2 improper connections to trace. Similar attachment issues occur with loader, mower, and plow hose misplacements. Slow, jerky, erratic bucket and unwanted arm movements. Retrace the 'wiring' diagram.

 

[oldnslo]

They're surplus center solenoid diverters. 6 gpm
Not sure if pictures will be very useful but the forward valve is mounted beneath the right floorboard and is connected to the boom circuit. When the grapple closes fully it squishes down the left side of the boom.

Is squishing down retracting the left lift cylinder but not the right?

Doesn't look right but I don't think it's hooked up incorrectly.
The rear valve is plumbed in by the three point hitch.

You need to verify what line this diverter is connected to. I would be concerned that it might be a tank line which would cause the back hoe to leak around the spools and if pressure builds to high crack the castings.

I checked the breather tube- that's clear.

 

[kennyd]

They're surplus center solenoid diverters. 6 gpm

Can you link to the EXACT valves used? Not just the homepage???

6GPM sounds awfully small for your B26.

 

[TMGT]

Can you link to the EXACT valves used? Not just the homepage???

6GPM sounds awfully small for your B26.

Most likely this valve SAE 8 6 GPM Double Selector Valve 12 Volt DC P15544-2 | Selector Valves | Hydraulic Valves | Hydraulics | www.surpluscenter.com

The B26 is only 6.9gpm on the loader circuit so a 6gpm is fine on a diverter valve, I run the same valve for an extra rear remote on my L3240.

Would be nice to see how its hooked up, what he describes doesn't make sense to be caused by the diverter, at least the front one. Rear I'm not sure what circuit he has it hooked into.

 

[xanadu1797]

This is the exact valve used on both front and rear

SAE 8 6 GPM Double Selector Valve 12 Volt DC P15544-2 | Selector Valves | Hydraulic Valves | Hydraulics | www.surpluscenter.com

SAE 8 6 GPM Double Selector Valve 12 Volt DC P15544-2, Selector Valves, SAE 8 6 GPM DOUBLE SELECTOR VALVE 12 VDC P15544-2, SOLENOID OPERATED DOUBLESurplus Center,P15544-2 ,

www.surpluscenter.com

 

[xanadu1797]

Is squishing down retracting the left lift cylinder but not the right?

You need to verify what line this diverter is connected to. I would be concerned that it might be a tank line which would cause the back hoe to leak around the spools and if pressure builds to high crack the castings.

Correct- the loader squishes to the left when I close the grapple fully.

I’ll try and figure out what line the rear is plumbed to on the spool valve.

 

[xanadu1797]

Could someone explain why you shouldn’t plumb to the tank line and what would be the alternative configuration?