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The reverse switch is closed? It has to be closed, or the pto will not going forward.
I understand the issue. But it still has a reverse switch! Do you have owners manual that has a wiring diagram in it? What is the long model number?
Th link above is a service manual,you will have to download it. Page 1 thru 15 shows the electrical for pto. The schematic is further back in the manual.
i would start by checking the reverse switch, shown about page 10.
Stuck switch! or damaged wires.
no, that is a bypass, the switch is shown under the frame.
i see question is still open. Did you find problem?
Did you see picture in the manual of the switch?