Toro Wheel Horse 520xi PTO drive Belt

[eibbed 63]

Good afternoon

I am having an issue with my pto drive belt for my Toro Wheel Horse 520xi.

I bought and installed v-belt 95-4094 and now the pto will not engage.

The tension indicators are in the same place on both sides and it is still not working.

The belt is a genuine Toro Lawn Boy belt.

I am open for any and all suggestions.

Thank you

Debbie Redick

[Maxwell-8 4,275]

Hello Debbie, 

 

I don't own a 520xi, but here is the operater's manual

3319-215 1998 520xi & 522xi OM Wiring.pdf

 

Is the belt slipping or is the PTO not engaging? 

Is the belt tight or does it have some slack?

Greetings from Belgium 

Maxwell

[eibbed 63]

Hi Maxwell,

Thank you for your reply.

After the v-belt shredded last week, I replaced it with a genuine Toro belt. David and I had replaced the belt  years ago and I replaced this one according to the manual. But for whatever reason, the blades are not engaging. I tightened the tension and the tension indicators are the same on both sides. The belt is not tight nor loose. I even tried making it tighter and that didn't work so I losened it and it didn't work either. I don't know if it is the PTO switch. It worked last week and I haven't had any issues before.

Debbie

[JoeM 7,871]

40 minutes ago, eibbed said:

I don't know if it is the PTO switch. It worked last week and I haven't had any issues before

Deb to make sure you have the right belt what deck is on the machine?

 

As far as the PTO not coming on you can turn the key on and not start the engine. Engage the PTO switch and listen to hear if there is a clicking on the front of the engine. 

 

Some pics of the belt routing will help if possible. I can take a few pic of mine if that will help.

[eibbed 63]

Hi Joe,

Thank you for your reply.

The mower deck is 52" and the model #78370.

I tried the PTO switch and there is NO click.

So I guess I am going to have to replace the switch.

Last summer my brother and I replaced the PTO clutch.

Is there anything else PTO? LOL

As for the drive belt diagram. 1 pulley in the center of the deck, 2 lower pulley box pulleys in the front of the mower and 1 large PTO pulley above them. I hope that helps.

[gwest_ca-(File Mod) 11,036]

Pto clutch will have it's own diagram

 

[eibbed 63]

Thank you for the wiring guide diagram. I don't believe I have this. I will put this in my folder.

[gwest_ca-(File Mod) 11,036]

You got the 7 pages downloaded?

[Jeff-C175 7,199]

Debbie, look carefully for wiring plugs that may have become dislodged when you were changing the belt.

 

@eibbed

[JoeM 7,871]

31 minutes ago, Jeff-C175 said:

Debbie, look carefully for wiring plugs that may have become dislodged when you were changing the belt.

Yep, plus make sure the 10 amp fuse is good.

[eibbed 63]

I will check the wiring and the fuse tomorrow. Thank you!!

[eibbed 63]

Good morning Gentlemen

I gave her a good cleaning this morning since it needed it from Spring mowing.

I checked all the wiring and the connections are good. I checked all the fuses and they are also good.

If you have any other suggestions, I would appreciate it.

Thank you,

Debbie

[Maxwell-8 4,275]

If you put the PTO on, does the engines stalls when you get out of the seat? This may tell if the machine is actually turning on the PTO

 

 

[Jeff-C175 7,199]

@eibbed

 

Do you own and know how to use a multimeter?

 

How are you at reading schematic diagrams?

 

At this point I would do some checking with the multimeter to see why the PTO is not engaging.

 

Does the PTO light come on when you engage it? 

 

And, as Maxwell pointed out, you are sitting in the seat, correct?  If you try to engage the PTO without being in the seat, the engine should die, provided nobody has bypassed the safety switches.

 

If you have and know how to use a multimeter, check for 12V on the brown wire to the clutch when you engage the PTO.

 

Edited June 12, 2022 by Jeff-C175

[Snoopy11 5,714]

Hopefully nothing is shorted out... no wires have gotten chaffed. Also... pull the PTO switch out and make sure all the wires are connected to the back of the switch. Trace the wires down to the PTO and make sure they are intact.

 

Hopefully it isn't a bad PTO.

 

You can OHM test the wires to check for continuity. Set your multimeter on OHM... and put one prong on one end of a PTO wire, and the other prong on the other end of the PTO wire. If it ohms-out... the wires going to the PTO are good.

 

You should be able to ohm test the switch as well. @Jeff-C175... you may be better at leading Debbie through those tests. 

 

EDIT... sometimes when belts break, they can mess-up the PTO wires....

 

Don

Edited June 12, 2022 by Snoopy11

[Lee1977 6,649]

Grounding to the frame and engine are just as important as power to the PTO  clutch.  If it doesn't have a good ground it doesn't have a complete circuit for the electricity to flow.

[Snoopy11 5,714]

2 minutes ago, Lee1977 said:

Grounding to the frame and engine are just as important as power to the PTO  clutch.  If it doesn't have a good ground it doesn't have a complete circuit for the electricity to flow.

I was looking at another thread about this tractor, and it looks like maybe the PTO itself was replaced in June of last year... BUT... it was replaced with one from Ebay, to my understanding.

 

Hopefully you did not get a POS, Debbie.

 

Don

[eibbed 63]

Maxwell-8  Yes, the engine stalls when off the seat.

 

Jeff-C175   Yes, I do have a multimeter but I have never used one. My neighbor had one and always helped David if he had issues with wiring on his Wheel Horses.

Yes, the PTO light comes on when engaged. Yes, I am sitting on the seat. There is a safety switch.

 

Snoopy11   I checked the PTO switch and all the wires are connected on the back of the switch. I did find more pieces of the old belt this morning. And yes, the PTO clutch was replaced last June. It was new and the same clutch I could have bought from my local lawn dealer, except $150.00 cheaper. It really does pay to shop around. LOL

 

Lee1977  Yes, it is properly grounded.

 

I was checking online and I can buy a new TORO PTO switch for $36.00.  I think it might be worth investing in a new switch.  Yes or No?

 

[Snoopy11 5,714]

2 minutes ago, eibbed said:

I think it might be worth investing in a new switch.  Yes or No?

I think so, but that's just my opinion. It's a good thing to have on hand anyway, in my opinion.

 

Some other guys on the forum may be more apt at aiding you in testing your existing switch for proper operation. You should be able to ohm-out the switch to test. It's hard for me to tell from Jeff's diagram... what pins on the switch to test...

 

Don

[Maxwell-8 4,275]

6 minutes ago, eibbed said:

I think it might be worth investing in a new switch.  Yes or No?

I think the switch is working, giving the engine stalls when out of the seat, pto light comes on, ...

Since you don't hear the pto "klick", it seems to me the connection to the PTO is interrupted .

The connector at the PTO underneath the tractor seems to not make a solid connection.

[Maxwell-8 4,275]

3 minutes ago, Snoopy11 said:

Some other guys on the forum may be more apt at aiding you in testing your existing switch for proper operation. You should be able to ohm-out the switch to test. It's hard for me to tell from Jeff's diagram... what pins on the switch to test...

number 6 should give power when engaged.

[Snoopy11 5,714]

16 minutes ago, Maxwell-8 said:

number 6 should give power when engaged.

Correct, but what pin does +power go into on the switch... pin 1 / pink?

 

I'm thinking... ohm testing input and output positive power pins when the switch is "engaged" may tell the condition of the switch itself... ohm-wise anyway...

 

Don

Edited June 12, 2022 by Snoopy11

[Snoopy11 5,714]

9 minutes ago, Maxwell-8 said:

I think the switch is working, giving the engine stalls when out of the seat

I'm not entirely sure how this machine is wired... I'll leave that to 520xi experts.

 

But I question... in my past experiences with this genre of machine... the engine will stall if the parking brake mechanism is not set... and the operator attempts to exit the tractor, regardless if the PTO is engaged or not.

 

Excuse my ignorance if I am wrong in this, but I am open to correction if I am wrong, and am certainly open to learning.

 

@Maxwell-8... what do you think? Am I off base?

 

Regards,

Don

[Maxwell-8 4,275]

27 minutes ago, Snoopy11 said:

 

Excuse my ignorance if I am wrong in this, but I am open to correction if I am wrong, and am certainly open to learning.

 

@Maxwell-8... what do you think? Am I off base?

That could very well be. I tend to end up with Horses that need complete rewires and I live all the safety switch out 

[doc724 925]

I had a 520xi for 7 years.  More than once I had bedeviling problems with things not turning on or turning off mysteriously.  In EVERY case it was operator error-mine.  Here are the things to look for

1.  Yes, you have to have the parking brake set every time you get off the machine or the engine will shut down.  If the brake is not set, I don't think it will start either

2.  You have to be sitting on the seat (squarely) or the seat switch will shut the engine down or not let it start.  If you sit on one side (and I cannot remember which one), the machine will not start. 

3.  There is a key switch under the seat (look between your legs when you are sitting on it).  This is a momentary switch only and if you start the PTO and while sitting on the seat, turn the momentary switch on, it will keep the PTO running so you can cut grass and and keep the snow blower running when backing up.  If you do not have this turned on, the moment you back up, the PTO will cut out.

4.  The only switch I had to replace was the ignition switch and I cannot remember why.  What I do remember was I had to buy it directly from Toro for about $45 and that was 5-6 years ago!

4.  This machine is extremely complicated.  I see that Gerry sent you the demystification guide, which shows each sub system separately.  Even with this, sometimes things are not that easy.

I sold my machine 4 years ago when I moved to Florida.  However I still have a full set of manuals (electronically).  PM me and I will be happy to send them to you.

 

Doc