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1693TA

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Farmington IL
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FAA Radar Engineer, (Retired)
I'd say it's been a while since that motor ran. Good Job on the resto. That bearing was really something special.

Thanks. More of a challenge than anything else for me. Many would simply give up and get a replacement but far too much was proving good via test equipment to chitcan the whole. Though I didn't photo it five minutes in the tumble blast cabinet made the brush holder and brushes look new. The commutator segments all rang good and the poles all were even in resistance. I don't have a "growler" but do have a micro ohm meter and it's quite accurate. All poles were within .03 ohms of each other which is quite close for such a less than precise application.

I have no idea how long that lift had been out of service but he purchased a new one several years ago and had another leased unit. Last I seen this one work on a job was in the early 2000's.
 

OFF

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Alberta, Canada
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Thanks. More of a challenge than anything else for me. Many would simply give up and get a replacement but far too much was proving good via test equipment to chitcan the whole. Though I didn't photo it five minutes in the tumble blast cabinet made the brush holder and brushes look new. The commutator segments all rang good and the poles all were even in resistance. I don't have a "growler" but do have a micro ohm meter and it's quite accurate. All poles were within .03 ohms of each other which is quite close for such a less than precise application.

I have no idea how long that lift had been out of service but he purchased a new one several years ago and had another leased unit. Last I seen this one work on a job was in the early 2000's.

I have a "growler" that I haven't used in about a hundred years. You want it? :D
 

OFF

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If you have no use I would make good use of it.

Let me know postage so I can reimburse.

Thanks!

I'll weigh it. Haven't used it for so long, I forget how heavy it is. Seems like a dream now but there was a time it was common to repair starters, alternators and generators.
 

1693TA

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Farmington IL
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FAA Radar Engineer, (Retired)
I'll weigh it. Haven't used it for so long, I forget how heavy it is. Seems like a dream now but there was a time it was common to repair starters, alternators and generators.

I've rewound lots in years gone by. Never have been much of a modern "box swapper" so probably good that I'm older as I'm not going to fit in.
 

OFF

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I dug the growler out today, it's all there. I was worried I had "purged" it already.

Too bad I wasn't thinking at the time and took a picture of it.
 

1693TA

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Farmington IL
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Hey Off, we've lost touch but I'd still like to have that growler.

Got another question on my 80F now that I'm thinking of it. I've looked all over for the 4X4 enabling circuit pouring over the electrical prints and mechanical hardware extensively. Keep in mind my head is as hard and thick as the steel this lift is produced from so I don't give up easily, but I'm stuck, (or was until yesterday). You see, I ventured off into the back yard to pull the axles in and the lift literally sunk into the turf almost to the main frame. It took EVERYTHING my 12K electric winch had along with the two drive wheels spinning together to get it out. Here are a couple photos to show the dilemma I was trapped within:

1679064081087.jpeg
1679064103661.jpeg

And my grand daughter giving me instructions on how to operate the machine last fall. Guess I should have listened better as I was cautioned about the "ruts", (more like impressions to me) in the front yard:

1679064186410.jpeg

These are more like "ruts" to me but I've got to get these fixed before my wife sees them.

Now back to how do I engage the four wheel drive?????
 

OFF

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Yes, I've still got the growler and you can still have it. I'm crossing the boarder in May, I'll bring it with me and send it from there. Those 80F are heavy! I've seen a 4wd 60F, but no 80's.
How about running tracks on it and modifying the drive system to let you steer by powering either one side or the other?
 

crane operator

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Mar 27, 2009
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sw missouri
In a picture you posted of your lift, only one axle has planetaries. So I'm going to guess that the other axle isn't driven, and you don't have 4x4.

1679089566495.png
 

1693TA

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Hi and thanks. I was being facetious with the 4X4 comments as these are only 2WD and physically very heavy in construction. They readily sink in soft turf and are terrible on anything that is not firm, level, and dry. Without suspension they really lack performance in less than ideal conditions.

Now to the "Meat" of the post:

"Off" has forgotten much more than I'll ever know on these and has been instrumental in helping get this thing from a hopefully useful scrap acquisition, to something that is very reliable, and usable. The post is kind of a "tongue in cheek" way of publicly telling him "thanks" once again and maybe share some humor of my ignorance, or ineptitude. I was laughing when it sunk, and was again finding humor in the extraction. "**** Happens" as they say, and we go on.

I'll speak a little further of the lift. "Off" provided wiring diagrams, hydraulic diagrams, and technical knowledge along with professional, and practical guidance to make the lift operational. I've never worked on one of these prior. He even explained how to spread the axels as the unit does not have outriggers for stability. I did have to install new hydraulic drive motors, and counterbalance valves to make the drive axle perform as designed. The prior owner had one counterbalance valve backed all the way off so it was the sole motive force as the other motor was worn out. Basically it was a "one wheel wonder" and wouldn't even pull itself on a gravel parking lot unless the counterweight was over this drive wheel. The original 5.95ci TRW/Ross hydraulic motors are long obsolete with no direct replacement available so went with a pair of new Char-Lynn 6.05 ci motors. I plumbed into the system adjusting the Racine proportional valve bank relief cartridge to the correct value, and this is how I found the counterbalance valves maladjusted when measuring flow/pressure to the drive motors. Being unable to adjust both equally I took them apart finding one with a broken spring from being forcefully adjusted. Ordered two new Sun Hydraulics units rated at system pressure and they work very well allowing both drive wheels to pull evenly, yet allow differential action through turning. If I would have selected a higher relief, or differential operating pressure, the wheels would act more as a "spool" rather than a differential, but I operate a lot in finished turf so didn't want to scrub more than necessary. These work very well in the application.

The wiring was/is a mess, and the hydraulic hoses are aged out from use and exposure. I have all functions working now and am going to rewire, and rehose the machine total after a good blasting and repaint. It is not new and modern, but does not have to be for me. Reliable, it must be and seemingly is now. It will start when zero degrees Fahrenheit with little trouble, and is ready to go with a few minutes warming up.

Apologies if I mislead anyone as that was not the intent, nor point. I know this lift is not 4X4 as no drive assemblies in the steer axle, and I've had the front wheels apart to repack the bearings and install new grease seals. Again, I was being facetious in the post referencing 4X4.

Going to smash on this one again as I couldn't have begun to fathom what it would take to make this lift operational had it not been for "Off" stepping up to the plate offering help.

If you got this far in the lengthy post your attention span is greater than mine, or you found it interesting? Don't forget it's about three minutes of your life you won't get back.

Thanks,
 
Last edited:

1693TA

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Farmington IL
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Go figure. I lost pilot pressure for the swing motor circuit in the Racine controls today. Manual, direct acting push buttons have nothing behind them just as if the engine and hydraulic pump were shut off. Drive, and elevation functions still work well and all three of these valves are a stacked affair sharing the same pilot oil supply. They work in parallel also meaning you can drive, elevate, and swing all at the same time. Good pilot pressure on the inlet and jumps right up to operating pressure when raising the boom so got some investigation to do.

Strange, very strange.
 

OFF

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Well, if I remember correctly......when one valve section stopped responding completely while the other sections still worked.....it was a broken spring. A little tiny spring. I circled it in this picture. labeled "pressure compensator"
 

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OFF

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I used to have a bag of them. Hopefully I didn't put them somewhere for "safe keeping". If I did, they are hopelessly lost.
 

1693TA

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Talk about karma. Was drilling down to the same area and that spring is right in the pilot oil path:


1679269124466.png

Know what you mean about "safe keeping". I've had to repurchase things because I can't find what I know I have..... This came on suddenly. worked fine yesterday, and today, dead circuit.
 

1693TA

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Farmington IL
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Looks like #57 on the diagram called a "Pressure Compensator Spring:

1679270254894.png

Does anything like to fall apart when you pull the bottom section free to replace this spring? Should the valve bank be removed from the machine and this repaired on a bench? Looks to be some standard "O" rings for seals and four socket head capscrews for access. Hate to get into those solenoid wires again.....
 

OFF

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First thing I did whenever working an F series for first time, was to attach a terminal strip in a location close to the proportional valve bank, and run all the solenoid coil wires to it. Ring connectors on both ends. Made future repairs much easier.
I always removed the whole pilot section before working on it too. The thought of you doing what you need to do while you and it are upside down, is giving me anxiety.
 

1693TA

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That is kinda like I was looking at it too. The art of contortion it looks to me. I need to rehose the machine so may just pull the valve bank complete and do it on the bench. I remember us conversing about the pressure compensation apparatus a while back and I think I'll do all three springs at the same time and keep spares. I'll get over to the JLG dealer tomorrow and see if they still have access to these as the Racine manual you gave me lists the part numbers.

I rewound all six of those solenoid coil bobbins at the kitchen table with a cordless drill using a micro ohm meter to measure length. Think I got the magnet wire and kapton tape from Digi-Key, or another online supplier but they all work well now. Thought I had the infant mortality of this lift in my tenure behind me, but forward we go.....

Wife doesn't like the lift in the yard as she seen the ruts so going to have to get something lighter to paint my two story bay window on the front of the house when the weather finally warms. This will allow me to get onto this lift for refurbishment and repairs and not be pulled off of it.
 
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