Posted by Texasmark1 on August 25, 2020 at 16:11:00 from (172.243.92.145):
1965 Ford 3000, CAV pump, tractor sits a lot and gets run half an hour or so at least once a month. Starts in a couple of seconds regardless of weather. Fuel is pristine and has PS additives. Was out yesterday, after having sat for maybe a month, fired instantly, then running 2.5 hrs at PTO RPMS, temp tad over center scale, well within white region, 2nd gear out of 8, 6' hog, pretty bumpy terrain and high summer, stemmy weeds, reason for using 2nd gear. Ran like new. Today same thing only for 3.5 hrs. All of a sudden it just eased itself to 0 rpm, slower than it takes to shut down when you pull the fuel shut off knob.
In troubleshooting back at the shop, great fuel flow all the way down to the fuel inlet on the side of the pump....cap is off the tank and in taking it off, no vacuum whishing sound. While crakking, the bleed hole on the pump will squirt clear slugs of fuel past the front tire....3'. Cracked an injector and no fuel there. Scuttlebutt has it that the fuel delivery valve inside the pump....that the governor spring helps to control, gets stuck. I disconnected the linkage to the shut off and the throttle valves, moved both back and forth trying different positions and no response when cranking.
U tube on 100 series tractors, different model of the CAV shows a pin valve that is said to stick frequently on CAV pumps, which is rotated by the throttle linkage supposedly. Said to be a problem when tractors sit a long time. Don't know what a long time is and that's where I am.
I know there is talent onhere. Make my day....grin. Thanks as usual Mark
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