My blades won't engage on my john deere d155. I've changed the pto switch, and pto clutch. I've checked the voltage and have 12 volts all the way to the clutch.

Try the following test. For safety purposes remove spark plugs. Now with engine off and key in run position turn PTO on. You should hear the clutch engage (clunk). Grab both sides of the clutch pulley and try to rotate the pulley. If the clutch is properly engaged you will not be able to rotate the clutch pulley without turning the engine.

More thsn likely your pto clutch is bad. When it fails, test for 12 volts at the pro terminal connector.

A possible cause is an open seat switch (operator presence). Locate the switch under the seat & unplug the switch from the harness. Place a small jumper wire into the female socket leads to the wire harness. If the PTO engages without engine shutting down, replace the seat switch.

Check to see if the mower deck is plugged or a piece of wood/debris is wedged between the deck and a blade, or some wire/rope is wrapped around a spindle. If the blades don't turn by hand, it'll stall your engine when the electric PTO clutch is energized.

Lastly, a discharged battery will cause an engine shut down if there's not enough reserve when the PTO is engaged. Measure the battery voltage with a meter. If the voltage is below 11.5 volts, you may have to replace the battery.

I believe this one has an electric clutch. Check to see that the switch is operating properly, that the wiring is good to the clutch, and that the clutch is good. Use a volt meter to check that there is voltage to the clutch when the switch is operated.

Turn the key switch to the on position. Pull the blade engagement switch on.Look under the engine and find the electric clutch. Disconnect the wire connection there and while using an ohm meter, check and see if there is 12 volts on one of the wires. If so, then the clutch may be your problem. If not, then you need to trace back the wire from the clutch connection and find out why there is no voltage

Probably the pto switch. Find the 2 wire 'T' plug from the PTO clutch and disconnect. With a voltmeter across the the 2 spades on the tractor side of the plug you should get 12 volts DC with the PTO switch on ( you may need to sit in the seat ). If you get 12 volts at the plug its probably the PTO clutch. If no power then its a fuse or the PTO switch

check the wires just as they go into the clutch i have had them break there and have been able to repair the wire

look at the fuses there maybe a blown one

check for power at the clutch if no power check the safety switches and the switch itself

I own a similiar John Deere model (L130, 23HP with a 48" deck). I would check the electric clutch (called a PTO). To do this check the wires to this clutch and look for something disconnected. These wires (to this PTO clutch) should have twelve volts with the key on and the blades engaged.