M1083 Grove Crane Issues

I hope I am getting this in the right place!

I am working on a M1083 with a Grove crane on the back for a customer of mine.

Model: FMTV-C
Grove America: 12361
MFR Part No: 1-195-0-00512
Serial No:83513

Built the year after I was born I just realized. 1992 Haha

I have been following the troubleshooting procedures in the tech manuals, but keep ending up at Contact DS Maintenance without a conclusion to what my problem is. Have done many searches on here and haven't found much directly pertaining to crane operation issues.

Everything works if the main power box is turned off and I hit the manual override switch.

If the main power box is turned on I hear a click and the bottom three controls work, LH outrigger, RH outrigger, and mast up/down. None of the four upper controls will work with main power box turned on even if I hit manual override switch.

It's got to be an electrical issue, pretty sure I am not getting any power to the top four valve solenoid if I checked them correctly.

Really could use an actual wiring diagram instead of the troubleshooting guide if anyone knows where to get one!

Thanks!

The 4 upper controls wont work until the outriggers are on the ground

The truck is a 1084

Going to go test it out! Man I'm going to feel like an idiot if it works!

you are too late, all the idiot positions are filled I am the head idiot.

That is the only way to override the lock for the boom is to have the outriggers down. The manual override is for if a hydraulic line is busted and you need to manually lift or retract something as it will release the check valve so that the outriggers or boom can be moved with other equipment.Or in the matter of a circuit failure in the power box. The manual override can not override the power switch safety while the power to it is on.

Thanks for the info simp5782, I've started my own mobile repair business after turning wrenches for John Deere dealerships for 6 years. One of my customers has six of these trucks, and nobody else wants to touch them. Been interesting figuring out the various systems, but this place has been a great resource!

Fireball, sure there isn't an idiot apprenticeship available? Haha Oh wait, that's called life and the school of hard knocks, I'm already enrolled in classes!

Check out my youtube page for some repair tips on them. Member suprman will be your parts source along with the Quick reference parts spreadsheet located in the stickies of the LMTV/FMTV forum.

Awesome!

Alright, was able to make it out to the truck again and test the controls with both outriggers all the way down. Still no response from my upper four controls. Is this circuit activated by the hydraulic controls lockout relay looking thing in the main power box?

Mine is also not working due to a bad solenoid on safety over ride.

I made a bracket to hold bypass button in and everything works.
This does bypass safety so don't be picking any thing you seem to heavy for crane.

Not a bad idea Coffey! Were it my personal machine I would probably do that. However, being a customer's machine and they have a multitude of different people that might be running it my guess is they'll probably want it to work properly to avoid liability issues. Not to mention it might come back one me unless I have them sign some sort of form I reckon.

Check solenoid on by pass.
I have not found one yet.

Will do, thanks Coffey!

Is the proximity sensor plugged in or taken any damage during operation? There is one on top of each jack and one on the winch.

Come to think of it seems like one of them on the outrigger was smashed if memory serves me right. Can those be bypassed for testing purposes?

Yes. It is simply a pressure switch that when pressure is applied to the switch from the outrigger it allows power to go thru it and return to the control box releasing the safety lock.

Crane is working! Thanks for the help guys! Figured out I wasn’t getting enough pressure put down by the outriggers to activate the proximity sensors.

One of them was missing the pad and wasn’t able to put down enough pressure. Put a block of wood under it and everything works!