I never had a problem with hoses bolowing out of my 7140 that wasn't my fault to begin with.  Those couplers can be very frustrating, but every time I had problems blowing out the hoses, eventually I found it was my fault.

To solve the problem for me when it happened, I cleaned the couplers very well with high pressure hot washer.  Not just a casual wash, but almost a surgical one. Then I greased the zerk on the couplers until I found grease running out between the moving parts, and physically moved the coupler parts to be assured there was no dirt trapped anywhere.  Then, when the hoses had been purged to make sure there was no pressure (sounds nice, usually was hitting the balls on the hitch or tapping the balls with a hammer, resulting in a hydraulic bath), I reconnected carefully to make sure the connections were correct.  I several times thought I had the hoses in correctly, only to find I had held them at a slight angle and they did not lock fast.  When you finally get it right, there is a satisfying feeling that lets you know they will not blow out.

I usually only had trouble when I was under severe time pressure to change implements, during planting time or when it was about to rain and I had a field to finish.  When I had lots of time, I seldom had a problem.

To make the above story short, wash coupler well, wash hose connections, and lubricate the zerk on the coupler well, and your problem should go away or at least get better.

Some aftermarket makes a lever that puts pressure on the back side of the coupler housing where it moves in an out, I never bought those.  If you hold the back until the hose is stuck in correctly, then push against your hand with the hose going into the coupler, it is easier to line up and make the connection correctly. 

There is a trick to make the connection, but you will have to use the above suggestions to start yourself on the path to making the things work correctly.  Main thing is to get all the back pressure off that you can, which includes shutting off the tractor and working the hydraulic levers back and forth to remove that pressure.\

When I learned to make sure there was no hose presssure when disconnecting, it solved a lot of my problems.

My flow controls stuck after a few years, but that had no effect on the hoses popping out.  I never saw much need for moving the flow control, usually caused more problems that they were worth, left them at full flow all the time.  I could see if you had something like a hydraulic anhydrous ammonia shut-off with a very small cylinder, they might help, or if you were trying to time the raise time of an implement with a different sized cylinder they might be necessary, but I never experienced that need for control.