1980 Case 480c Backhoe Shuttle Clutch Cutout Problem

[Chris up north]

Have a Case 480c. Clutch cutout is working perfectly when power shuttle is in reverse, but does not function at all when shuttle is in forward. Any ideas? New machine to me. Thanks in advance.
 

[the tractor vet]

Forward clutch pac is out
 

[Chris up north]

Thanks Tractor vet.
Can you explain further. I am not a mechanic. Have a little mechanical know how.
 

[AJ.]

if I understand correctly your clutch cut-out works in reverse but not in forward,secure the machine and go in under neat in front of the left back wheel with a flashlight,look up and you will see the shuttle unit,on the left back of the unit you will see what looks like a coke can on its side,that is the clutch cut-out solenoid,see that it is tight,check the wires coming off it so they are not getting caught in the F/R linkage,basically how thing works is pressure from the charge pump reaches the control valve,from there it is diverted to either the forward or reverse clutch pack,the pressure squeezes the clutch discs together and drive is engaged for the selected direction,when you press the clutch cut-out button the solenoid is energized and a plunger inside pushes a rod that opens a valve in the shuttle control allowing it to dump the fluid rather than send it to the clutch,the squeeze on the discs is released and the drive is suspended,check the solenoid is tight,if so there is an electrical problem some where else.
AJ
 

[Chris up north]

Thanks A.J.
On the opposite side of the shuttle from the solenoid, there is a small cap with two brass electrical contacts on it. What is that? The shuttle wiring harness has a fitting that slides over those contacts.
 

[AJ.]

That is the neutral start switch.
AJ
 

[VicS]

So it pulls in forward but just won"t stop when you push on the button? I wouldn"t worry about it, just use your foot throttle, it is the safest. Having the motor wide open and when your foot or finger slips off the switch is dangerous. I never use it.
 

[mite-help]

fwd clutch pak plates maybe swarmed & it feels locked in; but probly in a fight with reverse pak.--reverse always wins---
 

[AJ.]

Is the machine going forward when the F/R lever is in neutral,if so it is an entirely different problem than you first explained but it usually carries more symptoms such as bogging the engine down when reverse is selected,pointless of me explaining if the machine is normal in neutral,if not come back.
AJ
 

[Chris up north]

Hi VicS
The clutch cutout is activated when using the brake as well. It is nice to have when using the loader in a pile of dirt or gravel. Hit the brake, cutout kicks in, use the gas pedal to throttle up and the loader operates much faster.
 

[Chris up north]

Thanks mite-help
What do you mean by "swarmed".
 

[Chris up north]

Hi A.J.
machine stays stationary in neutral and has lots of pull in reverse.
As I mentioned this machine is new to me. The cutout harness was not pluged in originally. I pluged it in, cutout worked in reverse.Posted original question. Did a bunch of work with it yesterday, now cutout is not functioning at all.????? I will mess with wiring again. Do solenoids breakdown often?
Thanks
 

[AJ.]

I have not had to replace a single one,it is more than likely a wiring issue,with the engine stopped unplug the pig tail from the solenoid and connect a test lamp to the wiring,get a second person to press the brake with the key switched on,the lamp should light each time the pedal or switch is pressed,if not check that none of the circuit breakers has popped out, if they are OK the wiring may be chaffed or have a bad connection,you can test the solenoid by grounding one of the wires and touch the other with a hot 12 volts,you should hear it jump,keep the engine stopped while working on the machine esp the transmission as it can take off and run over someone.
AJ
 

[VicS]

Maybe mine works differently, I have a 480E. It has the solenoid on the forward reverse shifter. I still never use it.There is a button on the floor and another one on the hyd lever. One thing about a 480 is with the same hyd pump and engine, the hyd is really fast. If they can dig it they are faster than almost anything. Same with the loader. moving cold patch away from a blender, my little 480 will lap a 580M. Shame they don"t make them anymore. Also you can haul them legal on a 15000 lb. trailer and a single wheel pickup. They just weight 10000 lb. and Newer 580 M"s weight 16000 plus.
 

[Chris up north]

Thanks AJ
I really appreciate your help. I also got my hands on a fluid pressure test procedure for the power shuttle. I will do that once I jimmy a pressure gauge with hose together. That should give me some good info as well. I will post the results.
Thanks again!!!