Raven dosnt move mower works

[Paul]

Raven dosnt move after 5 minutes of cutting. However engine runs good and mower runs. One of the 48 volt batteries was leaking so I replaced the 48 volt battery, bought 4 new 12v at interstate batteries. Still having same problem... thinking of replacing 12v starter battery.... the raven has less than 25 hours on it... it was sitting in a shed for about 4 years...

Other info.. I cut for 5 minutes let it sit for 20minutes and it will start moving again... if I let it run after it stops moving, and come back in 20 minutes it will not move. It has to be off for like 20 minutes... also before it finally stops after moving for 5 minutes it gets jerky. I checked the high and low gear when it dosnt move by trying to switch them dosnt matter still dosnt move...

Any ideas?

[larrys]

Replacing the starter battery will probably not do anything to resolve your issue. When you replaced the 4 batteries, do you know what amp-hour rated batteries you purchased? If not, do you have the part number of the battery. When you say it gets jerky, do you mean it moves forward a few feet, then power seems to stop , then seems to go again and repeat?

Does the unit run and drive with no issues if the deck is unplugged and disconnected?  If so, you have a deck issue most likely. 

[Paul]

Batteries should be 20ah. However will verify.. yes jerky as in it moves a few feet stops then a few feet more until it finally won’t move... just installed starter battery made it a few laps around yard cutting and did the same thing... tryed unplugging mower deck but still won’t move... have engine running now will try it again after get off the seat

[Paul]

Should tractor be hard to push when it’s off and in neutral with parking brake off

[Paul]

I just tryed plugging something into generator it works. I turned off machine, flip the generator switch to off. Started and no power to generator receptacles ... so generator switch is working... still will not drive forward or reverse

[Paul]

Interstate battery part number is FAYTX20L

[Paul]

Looked at mower blades... saw there was a bunch of grass caked up under the deck... I mean a lot.... removed as much grass as I could.. jumped on tractor and it started moving... (note tractor was off when I was cleaning under deck also make sure to unplug it, not worth losing ur hand)

However there is a storm rolling in and I had to put it in shed... so no idea if this helped or not because after sitting for 20 minutes it usually will drive again

[larrys]

Be interesting to see if that had anything to do with it. Jerky motion is usually related to a week battery pack. Wouldn't think you have one bad battery but you never know since you just replaced all 4 batteries. They are 20ah batteries according to the part number. Can you measure the voltage of the battery pack. You can do it at the red deck plug since it is easier to get to. Measure it with the unit off and while it is running in gas mode (deck not plugged in).

[Paul]

Happened again today... took some readings and they are below

Tested at battery
51.9 not running
75.2 running

Tested at mower deck with 48v battery disconnected
4.7 not running
75.1 running

Tested at mower deck with 48v battery connected
4.0 not running
63.4 running

[Paul]

I don’t know if it’s suppose to be that low at the deck when it’s not running... any ideas could this be the problem

[larrys]

So let me see if I have this correct:

You have 51.9 volts at the grey plug on the battery when it is not running, correct?

You have 63.4 volts when the unit is running and battery connected at the deck plug, correct?

With the deck not connect starting from a fresh start (cool and not running for awhile), does the unit still stop and start or seem to run fine for a longer period? The reason I am asking as it appears there might be something going on with either the deck motor or controller shorting out. This can cause the mower to not move.

If I understand you voltages correct, then the battery is good and the unit is charging fine.  I am assuming you had the key turned off when you were checking not running at the deck plug.  If so, check with the key turned on as you should have voltage at the deck plug.

[Paul]

Understood readings correct..

I rechecked deck plug with key in and engine off and it gave me 51....

After changing the 48v battery a week ago I did run it with engine on for about 2 hours driving around without mowing (to note: the deck was plugged in) with no problems.

Maybe something is shorting out due to the deck motor running.... if it is not raining tomorrow might pull deck off and take a look at wiring on the deck

[Paul]

Today I looked at wiring by the air filter... everything was tight and looks brand new..

also took a look at wiring under seat and everything looked good except one relay connecter was half out (there’s 4 relays) but unsure if it was like that or me messing around looking at everything. If you were standing at the back of the MPV7100 it was the relay all the way to the left.

[larrys]

So if it is running fine not trying to use the mower deck than the issue is in the deck. Like I said earlier you probably have a controller or motor that is shorting out.

One other thing you could try with the deck. Take the metal covers off the top. This is a small black box with two connectors coming out going to each controller. Disconnect one and see what happens (one side of the deck should not work). If it runs fine than you eliminated one side of the deck. Try it both ways and see what happens.

Post your email and I can walk you through how to test the motors and controllers.

[Paul]

Took deck off.. check connections everything looks fine except one of the motors there is a blue wire that goes from the motor to a yellow box.. right before the yellow box the blue wire is exposed and I can see the copper wire.. looks like maybe a mouse nibbled at it.. however it is only on the top So it’s not like the copper wire is hitting the deck. I’m in process of repairing it.... my email is [e-mail].. also i see the black box you are talking about and understand how to disconnect each of the motors. Furthermore, I’m opening each connection and checking them as I see them and putting dielectric silicon on them before closing and re-zip tieing them.