The JLG 40F Boom Lift Dilemma

[OFF]

That looks more like a controller you would find in a 60H. I only saw two 40G's in my whole life, never did see a 60G, so I'm no expert on them. Typically, the yellow wire will be supplying 12 volts when the foot switch is activated. The orange & orange/white would be the function wires going to the coils on the valve body. I would guess at the red wire being the aux control power, black being ground, green I have no guess.

I have 40H manual handy, but they use a 9 pin connector and I see your new controller is only a 6 pin.
I'll go look for a 60H manual, if I find one and it helps, I'll be back.

 

[OFF]

Here's the only PQ controller I could find my JLG stuff with 6 pins and the right colour wires.

 

[Andrew Kmetz IV]

Here's the only PQ controller I could find my JLG stuff with 6 pins and the right colour wires.

Thank you for this schematic. I will wire this in following this diagram and see if it works. I greatly appreciate your help on my project!

 

[sweetwilliam]

Hi I have a 1979 40FR jlg lift I just bought at a auction. It has a 4 cylinder Wisconsin engine. It definitely has some age and element wear on it. I'm wanting to try to bring it back to life. I have had the engine running, it has some carb issues I can handle that but the hydraulic hoses are shot in the track going to the boom,and I do believe I will have issues with the wiring. Does anyone have a hydraulic diagram and a wiring diagram if so I would greatly appreciate it.

 

[Andrew Kmetz IV]

Here's the only PQ controller I could find my JLG stuff with 6 pins and the right colour wires.

So I followed that diagram with the new controller I received. In the factory wiring going to the proportional valves I had one ground tied to one of the positive coil wires. I removed that and grounded it to the valve and ran the yellow wire to one of the drive coils and green wire to the other drive coil. The valves are operating correctly now. So the controller is definitely a little different than the original controllers I replaced with but I will order two more of the same controllers and wire the other solenoids in the same. Looking forward to seeing this thing operate again!

 

[OFF]

So I followed that diagram with the new controller I received. In the factory wiring going to the proportional valves I had one ground tied to one of the positive coil wires. I removed that and grounded it to the valve and ran the yellow wire to one of the drive coils and green wire to the other drive coil. The valves are operating correctly now. So the controller is definitely a little different than the original controllers I replaced with but I will order two more of the same controllers and wire the other solenoids in the same. Looking forward to seeing this thing operate again!

That's good to hear! I love it when a plan comes together.

 

[Rhino1961]

It's been awhile since I've needed assistance. I'm needing parts for a Moog Model 60B Proportioning Control Valve. Anyone have any or know a source?

 

[OFF]

It's been awhile since I've needed assistance. I'm needing parts for a Moog Model 60B Proportioning Control Valve. Anyone have any or know a source?

I have the Moog manual (probably shared it with you already) but I no clue where to find Moog parts anymore. Sorry.

 

[Rhino1961]

You did share the manual and it has been priceless in keeping it going. I can jump the dump valve and manually push the over ride button on the side of the valve an all works in both directions. I can apply power to the white wire going to the solenoid and it will drive in one direction. Contacting the black wire does nothing. So I'm assuming the magnetic coil is bad ( Hydraulic amplifier ).

 

[maple2]

Started my 40f today first time since last year. All went good except no boom up or down in the basket. It would work good from the ground controls. Any idea where to look first? It has bertea valves if this helps.

 

[OFF]

You did share the manual and it has been priceless in keeping it going. I can jump the dump valve and manually push the over ride button on the side of the valve an all works in both directions. I can apply power to the white wire going to the solenoid and it will drive in one direction. Contacting the black wire does nothing. So I'm assuming the magnetic coil is bad ( Hydraulic amplifier ).

I only ever worked on one (maybe 2) JLG 60 with Moog valves & controls. It was an old baby for sure, I think it was a 1973 or 1974. I have no idea who might still have Moog parts. I have nothing for them. Sorry.

Is this hydraulic amplifier just a coil of coated wire around a bobbin? Is it contained in such a way that you can't get it apart to even see the wire? I'm wondering if maybe someone who custom winds electric guitar pickups might be able to help you out?

 

[dn29626]

Hello all
My priorities shifted last year , but am ready to finish repairing.
Two cylinders need rebuilding. The cylinder that lifts the boom is my chosen starting point. The top pin is removed as are the hoses disconnected. The bottom pin moved an inch or so ,now stuck and no longer cooperating. I need suggestions on getting the pin to move the rest of the way out.

 

[D 40G]

Off has suggested in another post to leave the bottom pin in place and lean the cylinder forward if I remember correctly. You would have to have the boom raised quite high and supported well to do this. A rooftop has been suggested. Doing it this way would also hold the cylinder and make it easier to unscrew the cap if the cylinder has a screw on cap. I have rebuilt every cylinder but the lift cylinder on my 40 year old 40G.

 

[OFF]

Started my 40f today first time since last year. All went good except no boom up or down in the basket. It would work good from the ground controls. Any idea where to look first? It has bertea valves if this helps.

Hi maple2. I never had much to do with Bertea valve 40F's. But, if your boom up/down works from the ground controls, then you must have a basket controller problem. Sorry I didn't notice this sooner.

 

[kfarms1973]

Hi i have a 40 jlg and the farm front solenoid valve is leaking on the 6 way lock. Can i take the apart and is as simple to fix with new o rings or done it need a whole new soleniod? And if so where could i get its very hard to find info on these. Thanks

 

[Jhv1050]

Hi i have a 40 jlg and the farm front solenoid valve is leaking on the 6 way lock. Can i take the apart and is as simple to fix with new o rings or done it need a whole new soleniod? And if so where could i get its very hard to find info on these. Thanks

If it’s leaking between the solenoid and block O-rings should fix it. If the solenoid itself is leaking then have to replace solenoid

 

[kfarms1973]

I have the Bertea 6 way block on a 40h jlg does anyone know where I can get a replacement solenoid for?

 

[vickiejo1]

I purchased a possibly late 70s, 79 JLG 40F Boom Lift today. When you step on the safety switch in the basket, it stalls the engine. Any suggestions? Trying to find a wiring diagram any thoughts?

Thank you in advance.

 

[OFF]

I purchased a possibly late 70s, 79 JLG 40F Boom Lift today. When you step on the safety switch in the basket, it stalls the engine. Any suggestions? Trying to find a wiring diagram any thoughts?

Thank you in advance.

Problem inside the foot switch. Bad diode in there most likely. There are two switches also.
Can you get the cover off the foot switch without a cutting torch and sledge hammer?

 

[OFF]

I purchased a possibly late 70s, 79 JLG 40F Boom Lift today. When you step on the safety switch in the basket, it stalls the engine. Any suggestions? Trying to find a wiring diagram any thoughts?

Thank you in advance.

You can start by checking voltage at the ignition toggle switch in the basket. If drops off to nothing when you step on the foot switch, you'll need to get the cover off and look inside the old girl.