PMaine 31 #1 Posted February 12, 2015 I have an Onan 16 that runs great. However, when snow blowing as soon as it goes under load I lose RPM. I never had this issue before. I cleaned the carb, did an oil change, and changed the hydro drive belt While I was at it. No Change. The engine just won't keep the RPM under load like it used to. You can't hear the Onan working or under load. Thanks for any input. Share this post Link to post Share on other sites
ericj 1,579 #2 Posted February 12, 2015 check the manual and then check the governor linkage. have you checked the compression on it to make sure it's running up to snuff. the onans sometimes drop a cylinder and owners don't even know it till they put it under a load , hopefully not you problem but better check and make sure eric j Share this post Link to post Share on other sites
boovuc 1,090 #3 Posted February 12, 2015 Check the PTO. If it is slipping under load, it won't trigger the motor to grunt up the torque Check the belts and look over the blower to make sure you don't have some drag on it. (bad bearing, etc). Check the idlers to make sure they are moving freely. Share this post Link to post Share on other sites
PMaine 31 #4 Posted February 12, 2015 I have been dreading the compression test, but I just went and did it. 100 psi cold on both cylinders so I am good there. I'll check the PTO, good tip! Share this post Link to post Share on other sites
PMaine 31 #5 Posted February 12, 2015 Checked the PTO. If I grab the snowblower belt and pull with the PTO engaged it will rotate the engine over (difficult but it happened). Share this post Link to post Share on other sites
ericj 1,579 #6 Posted February 12, 2015 pull the pto bell and check for hot spot and or glazing, glad to hear it passed the compression check eric j Share this post Link to post Share on other sites
PMaine 31 #7 Posted February 12, 2015 The PTO was slippling slightly under heavy load and after I did the oil change and other work mentioned above, I tightened the PTO rod up so it would apply additional pressure. Is this something that I should not have done? Share this post Link to post Share on other sites
ericj 1,579 #8 Posted February 12, 2015 no you did right ,are you sure you tightened, just asking there's always that oh sh.. moment . but if it was slipping it might have glazed it causing it to slip now. some body on here just found this on there tractor and told how they corrected it, but i don't remember who or were maybe somebody else can post a link to it for you eric j Share this post Link to post Share on other sites
boovuc 1,090 #9 Posted February 14, 2015 (edited) If the clutch lining and the PTO plate is glazed, all that is required is to sand off the glazing. Anything to rough the surface again. Just don't get crazy. Glazing normally occurs on clutches that have been slipping over a long period of time. My 310-8 needed sanded last summer. I would have sworn that I had a bad hub or pulley the way the tractor would "hang" slightly on a hill or on a tight turn on an incline. It was glazing and my fault for not doing better maintenance on it other than oil changes and greasing it. Edited February 15, 2015 by boovuc Share this post Link to post Share on other sites
