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post #1 of 5 Old 06-13-2010, 11:53 PM Thread Starter
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wheel horse 520-hc

Hi guys, I have been messing with garden tractors for a while , not really brand specific. I bought two 520's this past week . A 1988 520-hc and a 1991 Toro 520-h. I have a couple of questions about the 520-hc i hope yall can help with.
The carb needs some minor adjusting and the low speed adj. screw is well hidden behind the muffler. Whats the best way to get to it? Appears to still have the factory plastic cap on it.
I don't recall seeing many HC's (commercial)around in the past. How bout yall?

thanks , Mike

Oh , I posted some extra attachments i got in the deal in the for sale section.
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post #2 of 5 Old 06-14-2010, 03:32 PM
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Re: wheel horse 520-hc

My experience with the Onan carb is that it is best to take it off, tear it down, soak it clean, blow out all of the passages and put it back together. (I have a friend who doesn't soak his, he just takes it apart and blows all of the passages out with carb cleaner) If you do this, pull the plastic cap off of the low speed needle valve and count the turns until you can gently seat it so you will know the nominal setting when you reassemble it. If I remember right the manual calls for 1.5 turns out and then replace the plastic cap which only alows a 1/4 turn in or out. I haven't had much luck with the idle adustment, typically my problems have always been gummy passages or a vacuum leak. If you do want to try adjusting the idle valve, there is a hole in the bracket under the muffler. You can reach the needle valve through the hole with a long screw driver.

I haven't seen many HC's either. They were made in 88 & 89 for the commercial guys that didn't want all of the chrome, guages and fancy stuff. They were no longer available when the 1990's and later models came out.

Have fun with your 520's. As an OBTW, if you do decide to take your carb off, the best way is to pull the muffler and intake manifold. When I go that far, I always pull the covers on the valves and check the clearances. The last two engines I checked had burnt valves because the clearances were too tight.
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post #3 of 5 Old 06-14-2010, 04:58 PM
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Re: wheel horse 520-hc

Quote:
Originally Posted by 300zx View Post
My experience with the Onan carb is that it is best to take it off, tear it down, soak it clean, blow out all of the passages and put it back together. (I have a friend who doesn't soak his, he just takes it apart and blows all of the passages out with carb cleaner) If you do this, pull the plastic cap off of the low speed needle valve and count the turns until you can gently seat it so you will know the nominal setting when you reassemble it. If I remember right the manual calls for 1.5 turns out and then replace the plastic cap which only alows a 1/4 turn in or out. I haven't had much luck with the idle adustment, typically my problems have always been gummy passages or a vacuum leak. If you do want to try adjusting the idle valve, there is a hole in the bracket under the muffler. You can reach the needle valve through the hole with a long screw driver.

I haven't seen many HC's either. They were made in 88 & 89 for the commercial guys that didn't want all of the chrome, guages and fancy stuff. They were no longer available when the 1990's and later models came out.

Have fun with your 520's. As an OBTW, if you do decide to take your carb off, the best way is to pull the muffler and intake manifold. When I go that far, I always pull the covers on the valves and check the clearances. The last two engines I checked had burnt valves because the clearances were too tight.
Assuming no vacuum leaks, if there is much wear in the throttle shaft bushings the manual recommendation may be too lean and you will need to screw the needle out until the engine runs smoothly at idle. Most of the plastic caps have long since broken off so in the majority of cases it easy enough to get to anyway.
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post #4 of 5 Old 06-14-2010, 10:55 PM Thread Starter
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Re: wheel horse 520-hc

Thanks for the replies. Pulling the carb and going thru it isn't a problem. I've done them before. I figured i would try to adjust the carb first and see if that helped. However there is no access hole in the muffler bracket. I may have to make my own access. LOL

, Mike
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post #5 of 5 Old 06-14-2010, 11:39 PM
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Re: wheel horse 520-hc

Mike, I see what you mean about the access hole. I just checked my 1989 520 and it doesn't have the hole. My 1990 does. I stand corrected. LOL! Drill the hole, it makes it much easier.
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