look for the engage switch that has a picture of blades
The STX-38 should have an electric clutch for the mower deck. The switch to engage it is on the right rear fender. It is a toggle switch. You will have to pull up on the switch and forward to engage the blades.
The manual pto is the switch used to engage the mower deck.
The safety switch to start the motor on a Ranchking riding mower is located in the ignition. If the clutch needs to be depressed several times before the mower will start, there might be a problem with the adjustment of the clutch.
There's a yellow switch in the upper right hand portion of the dash. It's the PTO drive. Engage your clutch, pull up on the switch and move it forward, and that should start the blades spinning. If it fails to engage, it could be a bad switch or a bad battery.
why does my rider cut off when i engage the blades
That's not much info to work with. But, assuming that you are talking about a riding mower which quits when you engage the blades, I would tell you to check out the seat safety switch. For some readon the mower doesn't think there is anyone on the seat. It will not run with the blades engaged with no one on the seat. Somewhere attached to the seat you will find a small switch with two wires going to it. It may have come unplugged or it could just be a bad switch.
If the mower has a shift knob control for "Start" "Run" and 'Stop', the kill switch will be on the end of the cable that leads to the throttle bracket. If the mower has the safety handle that shuts off the mower when it is not depressed, the kill switch will be at the end of the cable that leads from the handle to the engine. If the mower is operated with an on-off ignition switch, the kill switch wire will be spliced to the switch "off" wire some where between the throttle cable and the switch.
transmission won't engage when you push the button on john deer 155c automatic
There's a safety switch under the seat. It will shut the tractor off if you get off the machine while the blades are engaged. It's not sensing your weight thinking you have fallen off the tractor.
For test purposes, unplug the switch, and push down on the center of the black plug at the end of the wire. You can use a zip tie to hold it down.
If you are saying that the mower shuts off when you engage the blades (or put the lever for the blades in the up position) then the most common problem is a bad seat safety switch. This is located under the seat. It has two wires going to it.