About three weeks ago I had a belt problem. Machine would kick to high idle and belt would chirp. Removed the hood, tensioned the belt and found out that the bearings in the pump were worn. Fan would wiggle a bit. Figured it would last a week. Put machine back together and checked belt chirp. Flipped switch to high idle and no chirp. Turned switch back to Auto and it idled down. Tried one more time, high idle, no chirp back to Auto.....uhhmmm, back to auto?...idle?? Hello?? Idle?? Ran it for three weeks at high idle while I would troubleshoot on Sundays when I got back home. Thanks to John at Stumpf's for the info!!
I tested here, tested there, tested it everywhere!! Found my reed switch broken and while checking one of the wires off the pc board the terminal pulled off of the board. Well, there's some simple troubleshooting!! Ordered new board, new reed switch and wire. Meanwhile I replace upper and lower hoses for radiator, coolant, water pump, plugs, wires, gas cap seal. Installed my Murphy gauges and so on. Today I pulled the hood, doors(really getting annoying) and installed the new reed switch, new board and found one of the electronics burnt on the back side of the board. Thought, hmmm, maybe?? Started it up and it went to high idle......and stayed there. Back to the schematic and checking with the meter. Low and behold after a few minutes I find I have no voltage and my high idle/Auto switch. Chase down the circuit and find it is fed from the back of the alternator thru the oil pressure switch. Voltage on the input side of the oil pressure switch, nothing out the other. Took a jumper wire and jumped the switch. Started and went to idle immediately. Struck and arc, went to high idle then went back down after a few moments.
So, not wanting to burn massive amounts of fuel while I wait for the part and me to get back home this weekend I had to rig up some farmer wiring. Took a toggle switch, one wire to the power side of the oil pressure switch, then the other to the other side. Turn off the switch and it will pull to full fuel while I crank to start then run up to high idle. Then I can turn on my temporary toggle and it will perform as normal! So glad to have low idle back! Bit of a backwoods solution but I can't use my backup welder while I wait to repair this one as I am using both.
Glad it's a nice simpleton welder!! Not some complicated computer controlled thing!!