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I have a 520H 1996 model year. When I push the throttle all the way up I'm only getting 3300-3400 RPMs. From what I've read it should be around 3600. I think the cable just needs adjusted but I'm not sure if I have to adjust it at the lever or the carb.

Also when I have the throttle down the engine surges. I don't really have the cash to have it rebuilt and don't know how to rebuild one. I've never tried before. Any helps withe these issues would be appreciated. Thanks guys!

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I have a 520H 1996 model year. When I push the throttle all the way up I'm only getting 3300-3400 RPMs. From what I've read it should be around 3600. I think the cable just needs adjusted but I'm not sure if I have to adjust it at the lever or the carb.

Also when I have the throttle down the engine surges. I don't really have the cash to have it rebuilt and don't know how to rebuild one. I've never tried before. Any helps withe these issues would be appreciated. Thanks guys!

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Surging is caused by lean operation - the resulting lean bog creates a 2nd pole that results in oscillations in the governor loop. Clean your carb out and/or richen up the idle mix.

JayC
 

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You can download an Onan service manual from Toro
https://lookup3.toro.com/request/request.cfm
Use model number 73501 and 69123456 for a serial number.

Toro has made a mistake on some of these. You may have only 7 digits in the serial number on the tractor.

Since this engine runs try a healthy dose of Seafoam in the fuel take. That will often clean the ports and return to normal operation after you burn that up.

Garry
 

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You can download an Onan service manual from Toro
https://lookup3.toro.com/request/request.cfm
Use model number 73501 and 69123456 for a serial number.

Toro has made a mistake on some of these. You may have only 7 digits in the serial number on the tractor.

Since this engine runs try a healthy dose of Seafoam in the fuel take. That will often clean the ports and return to normal operation after you burn that up.Garry
************

I would try what Garry posted first. Empty the tank--then add a hefty dose of Seafoam, then fill w/ fresh gas. if you have a in-line fuel filter--replace that also. and if you are useing e-10 ethenol gas, and the rubberfuel lines are OEM--I'd replace them as well--from the tank all way down...

Good luck on ur fix!

glenn
 
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