7810 pto

[gbsmith]

pto was working on the bush hog 1000 rpm , switched to 540 for the baler, now it won't run but about 5 seconds shuts off throws a no speed code,
placed a quarter between the shaft and engagement pin, also checked to make sure the reluctor ring was still in place it was, replaced the speed sensor same problem. switched it back to 1000 no change, where is the seat switch located hopefully that is the problem? also is there some way to access the error code to see if i can determine what quit working.

 

[used red MN]

also is there some way to access the error code to see if i can determine what quit working.

From google AI
To check Diagnostic Trouble Codes (DTC) on a John Deere 7810, you can use the tractor's built-in diagnostic mode without needing a service computer. [1, 2]


Here is the step-by-step process to access and read the codes:

1. Locate the Diagnostic Port: Open the fuse panel and find the empty fuse slot labeled DIA (or F10). [1, 2]
2. Insert the Fuse: Place a spare fuse into this empty diagnostic slot. [1]
3. Turn the Key: Turn the tractor's ignition key to the RUN (or ON) position. The digital dashboard display should now read DIA. [1]
4. Access the Controllers: Using your turn signal switch, click it as if you are making a right-hand turn, then return it to the middle position. Repeat this until you see the APC controller (or the specific controller you want to check) displayed on the dash.[1]
5. View the Codes: Pull the turn signal stalk toward you (into the "flash-to-pass" position) to select the controller. Your dash should now flash the 3-digit fault codesand their corresponding letters. [1]
6. Scroll Through Addresses: Tap the turn signal lever right to cycle through different controller addresses (e.g., Address 001 contains the stored codes). [1]

Clearing Codes


Once you have written down the codes, you can clear the inactive trouble codes. To do this, simply toggle the tractor's red hazard warning lamp switch on and off while the word END is displayed on the screen. [1]


If you are seeing codes related to 03, 04, 05, or 06, they typically indicate underlying wiring faults (like shorts or opens) rather than immediate sensor failures. [1]