Ryobi RM480E 38" riding mower won't move!

forcefed4door

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Anyone have any experience electrically with such a beast? There is 0 repair/technical service info on these mowers. Seems a lot like a golf cart chassis and has some similar parts. I have spent a few hours trouble shooting. I have unplugged almost every accessible plug to check connections. I have voltage checked in various sections as well. If I move the rocker to forward or reverse It won't move. Blades can engage though! The 48v selanoid is fine. If I turn the key on and off enough times it will suddenly work fine like nothing is wrong. But if I turn key off and on during use it will not move once again... Turning it on/off powers the selanoid each time with a common click sound. I'm really at a loss... Jumped out all possible circuits that could cause this as well such as parking brake and seat switch. Any ideas? I'm really guessing it could be the pedal sensor or the main drive control unit. This mower is only 2 years old
 
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videobruce

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The 1st question is have you contacted Ryobi??
I have three of their products and have talked to customer support more than once (for various reasons other than problems) and found they are above average to deal with.
That also depends on whom you speak to (like any place else).

Do you hear the drive motor(s) engaged (powered) by listening for any hum like noise (assuming one could/would hear something like that)?
Can you check for power going to those motors?
 

videobruce

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In the owners manual I found this;

Mower won’t move:
Start key not installed or is in OFF position.
Parking brake is set.
Direction control switch is in neutral (N).
Brake is depressed and/or accelerator pedal is not pressed.
Charger is connected to mower.

Attached is a wiring diagram if that helps thou it's not the exact model as far as I can tell. There is the possibility it could be electronic (PCB related).
 

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forcefed4door

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Thanks for the reply, and it's definitely an electronic issue. If it cooler outside 40ish degrees or below it'll move around perfectly fine and at that point I just leave the key on all day until I get home from work to mow the yard and at the point it's 60 plus degrees outside and works like a charge. But if I turn that key off and back on in that temp range it will not move, but blades will engage just fine.

And you are right about Ryobi. They were trying to force me to bring in for a repair, place was 2hours away and was gonna charge 300 for a pick up and drop off with a 2 week minimum turn around. After speaking with Ryobi I demanded and new drive motor controller, 300plus dollar part. They ended up sending me a blade motor controller. They let me keep that and have since just shipped out the correct part. I've also purchased a 12v power converter for a great price. I'm starting to stock up parts when I find them cheap so I can make any future repairs needed. Almost 3 years old and the 75ah batteries still have an excellent charge as well. Just hope I get it sorted out soon because it's very annoying.
 

forcefed4door

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Not much support here yet for these mowers I guess... But I can say in my situation, the drive motor controller was the culprit. Mower works like new once again, luckily the warrenty covered it saving me 300+ dollars. Pretty simple to replace once you cut through all the heat shrink over connections.
 
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