I did some motor home generator work since retirement but sadly have not kept up with the newer stuff.Being a flat head twin, the fuel economy isnt that good, but many of these units were made in gasoline and propane conversions, and they have given their owners years of reliable service.
Onan Model 4Bgefa261001 Wiring Manual For AThe manual for a lot of the Onans can be found on Smokstack, and I hear thats where you can find people that know these old sets inside and out.Bill Perkins says the treasure is the CCK with simple electrics, there was also one with a control board that failed in the early days.
Onan Model 4Bgefa261001 Wiring Generator Work SinceI recently looked at the brush springs and found one I didnt like the looks of. I called my local Cummins NW Dealer in Renton Washington and got hold of Mark Magner on the parts line. This old Onan purrs, and its nice to see a company carry parts for somethign they sold over 40 years ago. Hold down the relay that falls off, and see if it continues to run, then investigate what is susposed to hold it up, open relay winding Theres a Cummings Dealer (they bought Onan) in Renton WA who was very helpful in getting me new brushes for my CCK. Wiring from fields and controls has been slightly messed with. Is there any more complete wiring diagrams with wire numbers, etc on them I have the standard diagram with the manual, but it is not detailed sufficiently. Starting in the early sixties for about 15 years I made a living in the Air Force maintaining 40 or so, of these generators among a host of other assorted ground support equipment. ![]() These things literally ran thousands of hours a year and I can remember tearing down only one engine for internal problems. It was a near perfect example of a balanced engine, and though it never idled in normal use it could idle about as smooth as a Swiss watch. About the only unscheduled maintenance involved the 24 volt cranking battery that often times was castaways from the aircraft battery shop. Onan Model 4Bgefa261001 Wiring How To Adjust TheMechanics that complained about frequency control likely did not understand how to adjust the governor vacuum boost or did not replace dried out seals and diaphragm. Bad Onan mechanics were not hard to find because, like the Maytag repairman, they didnt get much practice. A few years ago I got a motor home CCK unit in my shop with a small circuit board on it that had failed. It had two large transistors and half a dozen diodes, caps and resistors. The local parts distributor only wanted 360 for a replacement board. He told me they had so much trouble with the solid state stuff that after a couple of years they went back to relays. The Continental has since been replaced with a diesel engine about which I have NO knowledge. It gave considerable trouble with oil transfer tube seals and the hot end of the turbine. It was great when it came to frequency control (400 cps or -1, every time) but it was a thirsty beast. It could blow through 90 gallons of JP-4 in less than 8 hours, and this, running half, or less, of its 175 KVA 400 Hz capacity and none of its 500Amp, 28 Volt DC capacity. The last time I saw one of the NF-2 light carts with and Onan CCK was in Alaska in 1974.
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