Reply to rusted:
[quote="ccjersey"]
There isn't a problem with the oil pressure is there? I know some of the engines of that era won't deliver any fuel until oil pressure builds up enough to release a stop in the governor or injection pump.[/quote]
This is what I was getting at in my previous post, but being more of an operator than a mechanic I probably didn't phrase it very well. There is a mechanical restrictor of some type that prevents throttle opening much above idle until pressure..fuel or oil ( I have always thought oil) rises past a set point..this can be easily felt on a machine with a foot throttle as pedal travel is restricted to little more than cracking the governor open until the pressure rises. It's been a few years now....but as I recall the decelerator works the same way...you can crack the hand throttle open but the decel pedal will lie flat with no resistance regardless of the hand throttle position until the motor is up and running.
Would help to have a serial number of the tractor. Early numbers did not have the speed limiter.......going off the high hp statement the change in hp was at 47A3678 or 48A6883 and yes these did have the speed limiter (engine oil pressure sensing). But.....apparently the unit is making oil pressure therefor a check of rack movement is recommended.
All the speed limiter does is block the movement of the governor arm control of the rack until oil pressure is made. If there is a problem with the decelerator itself it would be a mechanical issue...most likely sticking or binding. The engine would have to be running above idle to get motion at the decelerator pedal.
Yes you can crank the throttle open but there is no direct connection to the rack without going through the governor. If the rack can't or doesn't move your just moving the governor spring.
Forgot to mention: While you have the cover off the injection pump, roll the engine over by hand and check to make sure the pump lifters are traveling up and down in their bores. They have been know to stick after long periods of rest...thus no pumping.