Kelly 1,029 #1 Posted October 11, 2011 Ok with 5 520s here I need to get a service manual for them, but they are all diff. years any way what is the little switch besides the batt. that has a vacuum hose attached to it and 2 wires ? 3 of mine the vac. hose nipple is broke off, is it a Toro item, and anyone ever buy one? cost? if I know what it is I may be able to substitute another switch. Share this post Link to post Share on other sites
Raider12 13 #2 Posted October 11, 2011 Kelly, you bring up a good question. I have 2 1990's, 1 1991 and a 1997 520. I know all of them have this same whatch-macall it. But Im not sure about the 1997. I do have a hand full of manuals as well. I'll look this evening and see if there is any discription somewhere. Share this post Link to post Share on other sites
littleredrider 409 #3 Posted October 11, 2011 Get a pic of that thingy, I might have it kickin' around somewhere... Share this post Link to post Share on other sites
zieg72 209 #4 Posted October 11, 2011 Ok with 5 520s here I need to get a service manual for them, but they are all diff. years any way what is the little switch besides the batt. that has a vacuum hose attached to it and 2 wires ? 3 of mine the vac. hose nipple is broke off, is it a Toro item, and anyone ever buy one? cost? if I know what it is I may be able to substitute another switch. Every 520 i've had had that broken. Mine was the switch that sensed a clogged air filter to turn on the indicator light. Share this post Link to post Share on other sites
SAM58 30 #5 Posted October 11, 2011 Ok with 5 520s here I need to get a service manual for them, but they are all diff. years any way what is the little switch besides the batt. that has a vacuum hose attached to it and 2 wires ? 3 of mine the vac. hose nipple is broke off, is it a Toro item, and anyone ever buy one? cost? if I know what it is I may be able to substitute another switch. I believe it is the Air Filter Monitor, when the air filter starts to get stopped up it creates more vacuum and closes the switch. the switch triggers the warning light on the panel for the air filter.... Anyone that checks their Air filter a a regular basis will have no worry. someone correct me if I am wrong? :banghead: Share this post Link to post Share on other sites
HorseFixer 2,012 #6 Posted October 11, 2011 Ok with 5 520s here I need to get a service manual for them, but they are all diff. years any way what is the little switch besides the batt. that has a vacuum hose attached to it and 2 wires ? 3 of mine the vac. hose nipple is broke off, is it a Toro item, and anyone ever buy one? cost? if I know what it is I may be able to substitute another switch. Every 520 i've had had that broken. Mine was the switch that sensed a clogged air filter to turn on the indicator light. Yep, thats exactly what it is... Mine is the same way! Since I allready JB Welded the fuel pump shut and got it fixed why not JB Weld the nipple back on the gauge? If I recall correctly it looked like a little copper tube that was still on the vac hose end? If the back of the gauge is brass or copper I may be able to solder it back on with a good hot gun which I have. make sure you replace the vac hose as it is prolly stiff and brittle which is why the port on the gauge broke off in the first place. <_< ~Duke Share this post Link to post Share on other sites
Raider12 13 #7 Posted October 11, 2011 Yep, your all correct, it is a sensor for the Air Breather, it's part no. 114270, this little part at the dealer list for a sum of $86.24. Here is a pic of the it circiled in red below. Share this post Link to post Share on other sites
Raider12 13 #8 Posted October 11, 2011 Kelly, if you follow the link below, you can type in the model and then print all of the Operators, parts and service manuals for your specific model. https://lookup3.toro.com/request/request.cfm Share this post Link to post Share on other sites
sorekiwi 761 #9 Posted October 11, 2011 There was a thread about that switch a long time ago, I'll look for it now. Share this post Link to post Share on other sites
Kelly 1,029 #10 Posted October 12, 2011 Thanks guys now that I think about after you all said air filter, I do remember it is hooked to the bottom of the filter housing, I guess I will just plug the hose till I pull the filter housing and then just put a vac. plug on the fitting. Thanks for the manual link I will be printing them in a bit, nothing better to do, I have a cold that is kicking my a$$. Share this post Link to post Share on other sites
sorekiwi 761 #11 Posted October 12, 2011 Some reading: http://www.wheelhorseforum.com/index.php?...topic=11994&hl= I'm not sure if its the thread I was thinking about or not, but at least it gives a little info. BTW, mine is broken too, bith the nipple and the contacts. Share this post Link to post Share on other sites
Kelly 1,029 #12 Posted October 12, 2011 Ok I'm a idiot, or something, i went to the Toro site link above, entered my model no, and serial no and it comes back invalid serial no. I tried numbers close, with no better results, it's a 1995 520, I want to be sure I get the right manual as I need to do some wiring work, numbers are very easy to read, so no mistakes model no 73501, serial no. 5903477 any help would be great. Share this post Link to post Share on other sites
Raider12 13 #13 Posted October 12, 2011 Ok I'm a idiot, or something, i went to the Toro site link above, entered my model no, and serial no and it comes back invalid serial no. I tried numbers close, with no better results, it's a 1995 520, I want to be sure I get the right manual as I need to do some wiring work, numbers are very easy to read, so no mistakes model no 73501, serial no. 5903477 any help would be great. Kelly, I copied and pasted your model number and came up with nothing. BUT! If I type it in, it worked perfectly. Go figure. If have to make sure there no blank spaces in front of the first number. Hope you feel better soon Model Number: 73501 Serial Number: 59002947 Product Name: 520-H Garden Tractor Share this post Link to post Share on other sites
sorekiwi 761 #14 Posted October 12, 2011 Kelly, the "Demystification Manual" has the wiring diagrams for all the 520's in it. Kinda handy to be able to turn the page and compare to the next years model. It also has some good troubleshooting tips in it. Share this post Link to post Share on other sites
tiggercl 28 #15 Posted October 12, 2011 Ok with 5 520s here I need to get a service manual for them, but they are all diff. years any way what is the little switch besides the batt. that has a vacuum hose attached to it and 2 wires ? 3 of mine the vac. hose nipple is broke off, is it a Toro item, and anyone ever buy one? cost? if I know what it is I may be able to substitute another switch. I believe it is the Air Filter Monitor, when the air filter starts to get stopped up it creates more vacuum and closes the switch. the switch triggers the warning light on the panel for the air filter.... Anyone that checks their Air filter a a regular basis will have no worry. someone correct me if I am wrong? That's correct. The genuine Toro part costs around US$60.... PN# 114270 SENSOR AIR CLEANER Our Price: $68.28 Paul Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,032 #16 Posted October 12, 2011 Ok I'm a idiot, or something, i went to the Toro site link above, entered my model no, and serial no and it comes back invalid serial no. I tried numbers close, with no better results, it's a 1995 520, I want to be sure I get the right manual as I need to do some wiring work, numbers are very easy to read, so no mistakes model no 73501, serial no. 5903477 any help would be great. For some reason Toro thinks your tractor has an 8-digit serial number so enter it as 59003477. When in doubt check the Master Parts Viewer where they list the serial numbers expected but not always correct. https://lookup3.toro.com/partdex/index.cfm?xCaller=Toro This is not the only model number with this problem. Garry Share this post Link to post Share on other sites
woodchuckfarmer 333 #17 Posted October 12, 2011 Im in the same boat, mines broke too. The 520 and the 518 are both broken. :thumbs2: Share this post Link to post Share on other sites
Raider12 13 #18 Posted October 12, 2011 Im in the same boat, mines broke too. The 520 and the 518 are both broken. I have a feeling that there a lot of these little critters broken out there. Thank goodness we don't have to pass any kind of emission inspection with our tractors. :thumbs2: Share this post Link to post Share on other sites
wheelhorsevt 0 #19 Posted October 13, 2011 i can put a new one in the mail for 50.00 plus postageif its any help :thumbs2: Share this post Link to post Share on other sites
SgtBob 27 #20 Posted March 20, 2012 In searching for answers I found this old post. I just discovered the "air cleaner sensor" on my 520H as referred to in this post is also broken. My questions is for the members that posted on this topic. If I dont replace it, is there anything I need to do ? Share this post Link to post Share on other sites
Shuboxlover 478 #21 Posted March 20, 2012 Guess what I'll be checking tomorrow :eusa-think: Share this post Link to post Share on other sites
Kelly 1,029 #22 Posted March 20, 2012 I pluged the end of the vacuum hose. 1 Share this post Link to post Share on other sites
546cowboy 301 #23 Posted March 20, 2012 If you look where that hose hooks to the air cleaner, there is no vacuum there so you wouldn't have a leak. I don't know how the thing is supposed to work and have never seen one that wasn't broken and never really worried about it. You should be checking your air filter regularly. You wouldn't believe how fast they plug up in this sand around here. Share this post Link to post Share on other sites
tgranthamfd 29 #24 Posted March 20, 2012 Are those only on the Onan's? Share this post Link to post Share on other sites
