763 grapple / hydraulic problem

[Big Bri]

I loaned my 763 to a friend to do some dirt work, when I got it back I put my grapple on it to move some logs. Now The grapple won't stay up. If I open it it slams down with tremendous force. Any idea where to look to fix this problem, or am I missing something simple?
Thanks for the help

 

[SSdoxie]

Make sure you do not have the front trigger clicked ON (auxiliary in detent, full flow mode). if trigger is in detent flow out to grapple is same direction as thumb button moved to Left, this is normally grapple closed. Moving the thumb to Right temporarily reverses the flow to open grapple but when button release flow goes back to full flow the opposite direction.

 

[Big Bri]

Thank Dennis, I will try that tomorrow afternoon, I have to get a new hose, I kept playing with it and I guess I built up too much pressure and it split a hose.