| Author | Message | ||
| bernie newcomb (Newk)
Registered Member Username: Newk Post Number: 12 Registered: 9-2006 Posted From: 152.163.100.13 Rating: N/A |
does anyone know a good onan mechanic in south fla ? the dealer i talked with could not help me thanks Newk | ||
| Frank Rowe (Frankid)
Registered Member Username: Frankid Post Number: 11 Registered: 10-2006 Posted From: 63.239.248.1 Rating: N/A |
Repairing an Onan is like fixing your lawn mower. If you do not have a manual, get one soon. If ya tell the problem, maybe we can make it all better. Frank | ||
| bernie newcomb (Newk)
Registered Member Username: Newk Post Number: 13 Registered: 9-2006 Posted From: 205.188.116.13 Rating: N/A |
when a load is increased, the gen pulls down, if the load is decrased, the gen speeds up. under normal loads it will show 118 V at 60 hertz. if the ac compressor kicks off, the voltage will go to 150 volts and i have to shut it down. | ||
| John MC9 (John_mc9)
Registered Member Username: John_mc9 Post Number: 244 Registered: 7-2006 Posted From: 66.217.105.205 Rating: N/A |
Most gensets have two governor adjustments. One to set the base RPM/voltage, and the other to adjust the sensitivity. The sensitivity is usually adjusted by changing the amount of tension on the spring. The control rod (and spring) will have either an adjustable rod, or positions to move it to. The idle screw will set both the no-load power (rpm), and the power that the sensitivity control will bring it back to. You'll need a voltmeter to set both. (^%$*##~ even I can't understand that) Maybe someone else can 'splain it better..... | ||
| Jack Conrad (Jackconrad)
Registered Member Username: Jackconrad Post Number: 528 Registered: 12-2000 Posted From: 76.1.180.218 Rating: N/A |
Bernie, He is not a full time mechanic, but I believe Dave Hartley has twisted a few wrenches on Onans. You might give him a call. Jack | ||
| David Hartley (Drdave)
Registered Member Username: Drdave Post Number: 739 Registered: 5-2005 Posted From: 72.189.203.211 Rating: N/A |
The throttle return spring is either stretched or missing. The governor can exert a lot of pressure on the throttle linkage. If the return spring is weak, broken or missing the governor cannot pull back quick enough when the load is reduced suddenly. So by changing or adding a stronger return spring to close the throttle faster should solve the problem. The spring should yank the throttle butterfly close very fast and firmly so it exactly tracks the governor lever. That pull-back must be there or over-revving and overvoltage will be a big problem. ACE hardware should have an assortment of springs. You probably need a 2 to 4 lbs pull spring in about 2 inches long. Look on the governor lever and see what shape spring is on there that pulls it to the off position when the engine is not running. That is the return spring. Take that to ACE Hdwr and find one like it that is stronger. You will then need to reset the governor speed accordingly. 60 Hz on a meter. The voltage may vary a bit but the frequency should be bouncing from 58 to 63 hz but not much more of a swing. No load just at the upper edge of 60 hz with medium load it should sit at around 59/60 hz. When the load drops the freq may jump to 63 hz and then stabilize quickly. Jack, I am 3 hours away from him, But good try anyway.. Dave.... | ||
| Jim Wilke (Pd41044039)
Registered Member Username: Pd41044039 Post Number: 126 Registered: 2-2001 Posted From: 69.77.151.82 Rating: N/A |
Actually, if it's a gasoline genset, it could be nothing more than a varnished up carb. When they get that way, you can not stabilize the frequency no matter what you do. They MIGHT have a fairly sweet spot at a certain (usually max) load but as soon as the load changes, vroom, vroom, vroom. If that were it, the best fix is a NEW carb. I have rebuilt a couple and about half the time you can not get it to work right again once badly fouled by old gasoline. Jim-Bob | ||
| H3-40 (Ace)
Registered Member Username: Ace Post Number: 476 Registered: 10-2004 Posted From: 216.9.250.6 Rating: N/A |
NCBOB works on onan's and I think he is still in central florida. I've seen him in action at the rally. Looked like one of those wild animal shows where one animal devours another! If he sees an onan, the guy gets down right crazy!  Ace | ||
| Bob Wies (Ncbob)
Registered Member Username: Ncbob Post Number: 204 Registered: 2-2006 Posted From: 66.174.93.105 Rating: N/A |
Bernie...try Don Hillman Inc. in Fort Lauderdale. They've been in business since the 60's and know their stuff. How do I know them? I was Service Manager there for 9 years. NCbob | ||
| Jim Wilke (Pd41044039)
Registered Member Username: Pd41044039 Post Number: 129 Registered: 2-2001 Posted From: 69.77.151.82 Rating: N/A |
Bob's right. Don Hillman is very good! I just offered the Fort Myers guy because Bernie's profile said he's in Ft. Myers. Jim-Bob |