i have a high horse 7e the decelerator doesnt have any spring tension on it i took a inspection plate off the top and checked the spring it looked fine but it doesnt put any tension on the decelerator,the motor will start on either but doesnt seem to be gettin any fuel, i took an injector line off and i can hold my finger over it and stop fuel from coming out when the motor is turning over,does anyone have any ideas or any diagrhams of the injector pump they could post any help would be great thanks

Are you getting fuel flow from the tank and what is the fuel pressure (gage) when cranking. Holding your finger over the fuel injection pump discharge is a good way to risk injecting fuel into your body with severe consequences.

sounds like it's already decelerated to me. Something stuck in the linkage or governor or the rack in the pump.

Did this happen suddenly or after sitting up for a spell?

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.

I believe it will be a problem with oil pressure somewhere if the decelerator is not getting spring tension after start.

the dozer has been setting for probably 5 to 8 years, the pressure gauge shows normal when its turning over and the oil pressure gauge goes all the way over,but im not gettin enough pressure to the injectors where i took the line lose and held my finger over,i have the throttle is wide open and i pulled the decelarator is pulled up but i pulled it up with my had,what does the decelarator work inside the pump? does anyone know a web site where you can look at a manual for free? thanks for the replies any help or suggestions wil be greatly appreciated

If its been sitting that long the rack is probably stuck. Take the side cover off the injection pump and check for rack movement.

The decelerator is a mechanical governor control device and has nothing to do with oil pressure or the injection pump.

"ccjersey" wrote:

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.

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.