5 ton m816 wrecker no engine RPM

[Rick73aggie]

My m816 will not produce over 1200 rpm, it used to run just fine. I have looked at the linkage, no problem there I can see. Governor seems to be working just fine. It makes no difference where I set the remote throttle at the rear winch. I had to remove the primer pump nozzle from the intake and clean, it now works. I drained the water from fuel filter and looked at filter, seems clean. At my wits end, anybody with a idea where I need to start looking.

 

[frank8003]

Section II. Troubleshooting Procedures. . . . . . . . . . . . . . . . . 3-2
TM 9-2320-366-10-1

 

[Ferroequinologist]

Is it hard to start as well? Could be sucking air. If it is hard to start, slow to drop rpms when letting off throttle, and won't run up past a point, it is most likely air leak in the fuel system.

If it just won't run over 1200rpm but otherwise fine, sounds like a fuel restriction. Switch tanks with selector switch. If that works you have a blockage in one tank. If it doesn't work, change the filter, if that doesn't do it check filter in the IP.

 

[tie6044]

Mine does the same thing, try draining all the air out of the tanks and see if it still does it. Mine will hit high RPMs with no air in the tanks.

 

[doghead]

Sounds like the auxiliary governor is engaged.

 

[wcuhillbilly]

If you drain the air from your system and the engine is off, take a small set of pliers and push the piston on the Bimbi cylinder at the rear top of the injection Pump (IP), back into itself, then turn it a quarter turn. I should stay in. It may be out far enough to be caught on the carriage bolt that is the adjuster on the govener linkage, Mine likes to overshoot this bolt and hang up. Once it is retracted and locked, fire the engine, build air and see if you can reach higher RPMs.
I hate having to raise the hood everytime I use the crane, thus Im working on replacing the line for the aux gov and putting an air switch in the cab that I can engage and dis-engage the aux Gov from the driver seat.

 

[timntrucks]

that rear governor will not let it get much over a idle. need to check everything on the pump

 

[Floridianson]

Mine is set for 1100 rpm. Rick is your rear winch /hyd. control back in the off pisition. That is the leaver faceing the passenger side and controls Hyd. and brings in the Aux governer. Don't think it could happen but if the air cylinder is correct on the PT then check the linkage that runs from the rear control up to around the transfer case air switch then to the PT.

I corrected this post to read a little better.

 

[wcuhillbilly]

Mine is set for 1100 rpm. Rick is your rear winch /hyd. control back in the off pisition. That is the leaver on the passenger side and controls Hyd. and brings in the Aux governer. Don't think it could happen but if the air cylinder is correct on the PT then check the linkage that runs from the rear control up to around the transfer case air switch then to the PT.

HMMMMM!!!! mine doesnt have this linkage..... just the johny bar at the winch control in the bed with the throttle lever/cable.. I mean I do have the crane/winch engage/disengage levers but they are on the Driverside rear of the winch..... Im gonna have to go crawl under it again......

 

[Floridianson]

Ok yea the drivers side but there are two leavers. Faceing the rear it would be the left one or Hyd. not winch control. This is the one that brings up the hyds. and puts the aux. gov. into play. If you trace down the linkage there is a valve that opens to alow air to the Aux. Gov. So in real time if all is correct the air cylinder on the PT will not have air to it if the rear is not ingaged. The incab behind the driver seat just brings the transfer case PTO into play.

 

[wcuhillbilly]

Ok yea the drivers side but there are two leavers. Faceing the rear it would be the left one or Hyd. not winch control. This is the one that brings up the hyds. and puts the aux. gov. into play. If you trace down the linkage there is a valve that opens to alow air to the Aux. Gov. So in real time if all is correct the air cylinder on the PT will not have air to it if the rear is not ingaged. The incab behind the driver seat just brings the transfer case PTO into play.

Ok, thought i was missing something with the "passenger side" thing. Yes this is how mine is set up

 

[Rick73aggie]

thank you, all those TM can be confusing, a lot of pages with only one or two that apply to the problem but does not answer the question. thanks for narrowing this down.

 

[Rick73aggie]

switched tanks no difference. have checked filters, seem to be okay have not changed it. thanks

 

[Rick73aggie]

will look at this to see if this is the problem. thanks.

 

[tie6044]

Try draining the air tanks and see if that makes a difference.