Cat 312 not throttling up

[312digger]

does anyone have a clue where to start to look, no throttle response,it just idles

[woberlin]

The first thing that I would check would be the throttle linkage. It sounds as though it may have come apart somewhere. God luck!

[312digger]

I checked the cables and they will work by hand,but I get no response when I turn the throttle knob on the inside.It must be something in the governor motor.Does anyone have a 312 service manual?

[dayexco]

if they're set up at all like deere......check and see if you have a loose connection from your battery to your computer, we've also had the sensor that runs off the flywheel go bad, not sending signal to the computer. is your machine set up where you can manually override the computer? can you do a self diagnostics on it? the deeres have a flashing light diagnostic that flash a code at you to tell you where to look?

[DR RPM]

Try the right hand stick, push the button on top, this is the idle down control, this has happened to our 307C alot. :bash

[Monrad]

Also there is a circuit breaker in the box that controls that stuff, have a gander at your fuses

[mikef87]

My 320 had a problem like this. It was the electric box that the throttle cables run to. I can't remember the fancy name for it. But that where the problem was.

[bobin35]

I have seen the fuses test ok on the panel but id change the fuse for the controller just to be sure.I have seen the fine fuse wire in between the blades break.

[John C.]

The throttle is controlled by the computer but there is a bypass switch on the function. I believe it is on the back of the one of the arm rests. There is a plastic panel you can open and two toggle switches inside. One puts the system in bypass and the other controls the throttle motor manually.

If the throttle works in bypass the throttle control motor is good. If not you have a wiring or computer problem.

Good Luck!

[bosco0104]

i am having similar problems with my 311. It will run fine when moving the joysticks but when i am walking the AEC will kick in and not power up for walking. If i move the sticks then it will throttle up for a few then back to AEC throttle down. Any ideas on this one?

[Vantage_TeS]

The throttle is controlled by the computer but there is a bypass switch on the function. I believe it is on the back of the one of the arm rests. There is a plastic panel you can open and two toggle switches inside. One puts the system in bypass and the other controls the throttle motor manually.

If the throttle works in bypass the throttle control motor is good. If not you have a wiring or computer problem.

Good Luck!

That's exactly what I was going to write. It's on the right armrest behind the seat and its a silver toggle switch. I hit that one with my backpack and it took me a good 5 minutes to figure out what the heck happened. Same deal, you lose your throttle control completely.

[WhyWhyZed]

i am having similar problems with my 311. It will run fine when moving the joysticks but when i am walking the AEC will kick in and not power up for walking. If i move the sticks then it will throttle up for a few then back to AEC throttle down. Any ideas on this one?
I'm guessing your travel alarm quit at the same time...
On some 300 series, the pilot pressure switch or switches were under the cab. On other 300 series, a travel pilot pressure switch on the main valve closed. Switch or wiring would be first to check- the switch closes to ground the wire to signal the ECM. If the switch or wiring not the problem, could be an issue with the pilot logic network in the main valve.

[WhyWhyZed]

throttle backup switches are behind the RH console on B series. On A series, they are under the plastic sliding covers of each armrest (pump control one side, throttle the other). Throwing the governor actuator backup switch to "0" position and then moving the momentary rabbit/turtle toggle switch will test the governor actuator motor. If the motor functions in backup but not in regular position, the speed dial switch, wiring or ECU could be faulty. Try it with the AEC off. If machine is a B series, you could also be in user mode 3 with max speed programmed to "1"