kpinnc 15,165 #26 Posted yesterday at 12:33 AM 2 minutes ago, Krice58 said: Looks like the tachometer and gas gauge don’t work. Voltmeter and vacuum gauge do work. If the 520-H has a weak spot (you know, after 35 years ), it would be the electrical system. They had more guages and wiring than any other model. If the engine and transmission are good, you've got a solid and powerful machine! 2 Share this post Link to post Share on other sites
lynnmor 8,009 #27 Posted yesterday at 01:45 AM 1 hour ago, kpinnc said: If the 520-H has a weak spot (you know, after 35 years ), it would be the electrical system. They had more guages and wiring than any other model. If the engine and transmission are good, you've got a solid and powerful machine! If all of the gauges burned out you would be left with an ordinary Wheel Horse. 2 Share this post Link to post Share on other sites
953 nut 61,320 #28 Posted yesterday at 11:33 AM 22 hours ago, Krice58 said: no belt. The deck number is 058SC01 (1988). found a manual but no parts list for that model Download this chart and save it for future reference. 1 Share this post Link to post Share on other sites
Ed Kennell 42,700 #29 Posted yesterday at 11:34 AM The 520 wiring problems are well known. There are many posts here on the overheating of the molex connectors. The overheating of the rear cylinder that causes the exhaust valve seat to loosen is also a concern in the Onans. The missing seal around the oil filter contributes to the overheating problem. I have also found failure of the gasket between the oil filter base plate and the block that causes a very small oil leak. The small amount of oil is blown across the rear cooling fins causing the grass to collect and clog the fins. 1 Share this post Link to post Share on other sites
Krice58 77 #31 Posted yesterday at 07:26 PM Looks decent to me. Not the prettiest but runs nice. 3 Share this post Link to post Share on other sites
Krice58 77 #32 Posted 22 hours ago What’s the correct oil filter for this? The number on parts tree crossed to a Wix 51374 but I pulled a 51762 off of it. Share this post Link to post Share on other sites
Handy Don 14,414 #33 Posted 21 hours ago 1 hour ago, Krice58 said: What’s the correct oil filter for this? The number on parts tree crossed to a Wix 51374 but I pulled a 51762 off of it. This is what I have in my notes for the engine: Oil filter Onan 122-0800 NAPA Gold 1762 (1764 had the wrench end) Fleetguard LF3339 • ⁃ Wix 51762 (4.5”) For the transmission: Wix 51410 or Napa 1410 because it does not have a by-pass valve 3 Share this post Link to post Share on other sites
Krice58 77 #34 Posted 20 hours ago 59 minutes ago, Handy Don said: This is what I have in my notes for the engine: Oil filter Onan 122-0800 NAPA Gold 1762 (1764 had the wrench end) Fleetguard LF3339 • ⁃ Wix 51762 (4.5”) For the transmission: Wix 51410 or Napa 1410 because it does not have a by-pass valve I put a 51410 on the transmission, from what I’ve read I believe either will work but I think the 51762 is just the longer version of the 51374. Share this post Link to post Share on other sites
kpinnc 15,165 #35 Posted 18 hours ago 1 hour ago, Krice58 said: I’ve read I believe either will work but I think the 51762 is just the longer version of the 51374. You're gonna want the longer filter. Besides making it easier to remove later, it works better with the big gasket that you absolutely should use for proper airflow on that rear cylinder. 2 Share this post Link to post Share on other sites
Krice58 77 #36 Posted 4 hours ago 13 hours ago, kpinnc said: You're gonna want the longer filter. Besides making it easier to remove later, it works better with the big gasket that you absolutely should use for proper airflow on that rear cylinder. Thanks for the info! Share this post Link to post Share on other sites
Krice58 77 #37 Posted 43 minutes ago Cut some grass with it today, surged quite a bit. I know it sat prior to my getting it, so I’m guessing dirty carb? Maybe a vacuum leak? Share this post Link to post Share on other sites
