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Stuck In Hawaii D9G Still Wont start!!! Bad Injection Pump????

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1 year 11 months ago #207428 by gvanhouten

The injector pump is 6 injector pumps it's a very simple unit, I feel you need to not waste your coins and get it back on the engine after you have given it a good inspection. tctractors


Okay I appreciate that. I will inspect it and was thinking of rebuilding it myself not sure?

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1 year 11 months ago #207430 by Old Magnet
One for tc,,,
I've been studying that Decelerator governor control again....
Being this unit has been down for some time I'm wondering if that piston that loads the governor spring is stuck in the up position which would allow the rack to be held in a minimum/low idle position. There is that balance spring above the piston but I'm not sure
if that would overcome the governor weight spring in a no oil pressure situation or if it needs to work in conjunction with oil pressure to allow the start mode. This could also determine where a stuck piston position would be.
Your thoughts????
George, what are you seeing for oil pressure when cranking?

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1 year 11 months ago #207432 by gvanhouten

One for tc,,,
I've been studying that Decelerator governor control again....
Being this unit has been down for some time I'm wondering if that piston that loads the governor spring is stuck in the up position which would allow the rack to be held in a minimum/low idle position.
Your thoughts????
George, what are you seeing for oil pressure when cranking?


The spring when looking up through the panel does not look like it is putting any tension on the spring... I thought that when it spun the weight on the bottom might apply force....

Oil pressure goes up into the white of the gauge gradually after spinning the starter for awhile. My thought was after releasing the rack that was stuck in the bindings that something must be wrong with the govenor...

Where is the piston located you are referring to? Thank you for your dedication with seeing this through.

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1 year 11 months ago #207433 by Old Magnet
If you can see it that's not the governor spring that I'm referring to. The one I'm talking about lives just under the decelerator tower. In my service manual (you said you had one) look in section 3A-10 Group 260.6 Page 11 under Decelerator Operation. Piston item #8 is what I'm referring to.

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1 year 11 months ago #207434 by gvanhouten

One for tc,,,
I've been studying that Decelerator governor control again....
Being this unit has been down for some time I'm wondering if that piston that loads the governor spring is stuck in the up position which would allow the rack to be held in a minimum/low idle position. There is that balance spring above the piston but I'm not sure
if that would overcome the governor weight spring in a no oil pressure situation or if it needs to work in conjunction with oil pressure to allow the start mode. This could also determine where a stuck piston position would be.
Your thoughts????
George, what are you seeing for oil pressure when cranking?


I believe in the service manual you are referring to the plunger? (7) It states

"When the operator moves the governor control lever to the low idle position, spring-loaded plunger(7), in lever (3) halts the movement of the lever on the plunger contacts roller (4) on a lever held in the slot of low idle adjusting guide (5).

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1 year 11 months ago #207435 by gvanhouten

If you can see it that's not the governor spring that I'm referring to. The one I'm talking about lives just under the decelerator tower. In my service manual (you said you had one) look in section 3A-10 Group 260.6 Page 11 under Decelerator Operation. Piston item #8 is what I'm referring to.


Okay I got it, Piston (8). Now in my attempt to start the machine I have pressed the pedal which I believe is connected through to the decelerator... Maybe I was wrong... The oil is deffinetley flowing through and lubrication the governor/decelerator.. I guess I need to somehow figure out how to make sure the piston is not frozen....

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1 year 11 months ago #207436 by Old Magnet
We're kind of jumping around here. There's spring loading when running and spring loading when not running and spring loading when starting. When not running main governor spring loading would be minimal. In start mode with oil pressure in combination with piston spring loading should be enough to allow starting but not high rpm. Main governor spring loading when operating would vary with load. The item I'm trying to sort out is what happens if the loading piston happens to be stuck and if it is stuck could it be in low idle mode or start mode position and not allowing enough rack movement for a good start.

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1 year 11 months ago #207438 by oldbeek

The injector pump is 6 injector pumps it's a very simple unit, I feel you need to not waste your coins and get it back on the engine after you have given it a good inspection. tctractors

I adjusted my pumps with just a dial indicator caliper and a 9/16 oe wrench and a 6" cresent. No special tools required. I would set each pump just on the wee advanced side of the specs. When I adjusted mine, all pumps were off and a little retarded. Resetting made it easier to start and overall ran better. The oil pressure retard system on that series of engines will allow enough fuel to idle and run. Just not enough fuel to damage the engine and let the operator know to look at the gauges.

Cat 12 grader, 8T6995 running and restoring, Cat 12 grader 9K3585. parts machine, Adams leaning wheel Pull grader Mod # 22, ser#438

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1 year 11 months ago #207439 by Old Magnet
If you hit the decelerator pedal and hold it there you wind up in low idle mode. The loading piston would be in the up position and governor main spring would have minimum compression (rack near off). I don't know any way of checking the piston without taking it apart but I'd like to get tc's input before tearing into it. He's the one that does this for a living, for me at this point it's just a hobby.

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1 year 11 months ago #207440 by gvanhouten

We're kind of jumping around here. There's spring loading when running and spring loading when not running and spring loading when starting. When not running main governor spring loading would be minimal. In start mode with oil pressure in combination with piston spring loading should be enough to allow starting but not high rpm. Main governor spring loading when operating would vary with load. The item I'm trying to sort out is what happens if the loading piston happens to be stuck and if it is stuck could it be in low idle mode or start mode position and not allowing enough rack movement for a good start.


Ok I understand... Do I need to take it apart to see if the piston is indeed stuck? Sorry about jumping around here... Or is there a way to release it with just the cover off from the bottom... Maybe I can use my camera otoscope to look and see what position it is in....

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