Connecting 3'rd function hydraulics on M59

[mikester]

Hi guys,
I have a grapple on the M59 that uses skid steer flat-face hydraulic couplers. I've tried shutting the tractor off and operating the solenoid switch on the joy stick to equalize pressure in the grapple circuit but nothing seems to help. It's much worse if the grapple is setting in the sun and the oil expands. Is there some way to relieve a bit of pressure on the couplers so they can be hooked up? Ive even thought of plumbing in a small bleed valve but this would be messy. Thanks
Scott

I have a similar problem with my grapple. I have two work arounds:

1. I installed a toggle switch so I can lock the hydraulic valve in the open position. I turn off the machine, turn the key to the on position, toggle both valves to relieve the pressure, then I get out and uncouple the hydraulics.

2. If reconnection is causing problems, I tilt the bucket until the clam shell hydraulic cylinder is unloaded position (i.e. I can move it by hand easily). At that point the couplers engage easily. Usually I can get one of the couplers to connect first. Again I use the hydraulic valve locked in the open position with the machine off but the key in start position.

Rarely do I have to crack a fitting to relieve the pressure. Moving the implement into the shade of a cool barn helps too.

 

[Smokeydog]

Couple of photos showing flat face coupler clamp. Since making this a few years ago have not had to loosen a fitting to relive pressure build up of an attachment. Doesn’t take much force. Once started they self align with a little wiggle.

 

[Hersheyfarm]

When you shut the tractor off you do turn the key back on so the electric valve will operate don稚 you? I have used a pressure gauge on my front hydraulics and that痴 how I relieved pressure.

 

[Smokeydog]

Don’t have trouble on the tractor side with cycling the valves to relieve the pressure. It’s the attachment side when stored builds up pressure.