OK, If you are going to keep the ball valve on the pressure relief loop, for occasional checking, you must make sure the lift never reaches the limit and so never allow full pressure on those fittings. It should be safe to partially close the ball valve for a few seconds to check the condition of the unload valve, as long as the ball valve is re-opened quickly. Otherwise your trousers will get a bath of oil when it pops.
Also, If you are going to use the tractor with the temp fix in place, you will want to keep the ball valve handle from moving accidentally. Tie the handle to the valve or lock it some other way.
Hope your temporary setup works out for you until you can get around to repairing the lift valves.
BTW - I see green grass in your pictures. I'm very jealous. I haven't seen green grass since October.
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