Why do you think you need power beyond on an SMTA?
The only reason power beyond would be necessary on an SMTA is if you already have the christmas tree valve, and want to add more valves, AND use both simultaneously.
If you don't already have a two-way valve, do this:
1. Mount the spool valve in a convenient location.
2. Connect the upper pressure outlet pipe from the hydraulic reservoir under the gas tank to the IN on your spool valve.
3. Connect the OUT from the spool valve to one of the return plugs on the hydraulic reservoir. There's a 1" pipe plug on the reservoir body that the christmas tree valve normally drains into that you can use.
4. Run lines from the work ports on the spool valve to the rear of the tractor, and add quick couplers.
You will need to tie the lever on the hydraulic reservoir back to make the system work. BUT that is how it was done in the day. That is "stock" normal operation, how it was designed.
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