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Lifting and Loading Pay loaders, Fork lifts, tow motors, jacks and hoists.

Lifting and Loading

Daewoo Forklift - Lift Cylinder Repair


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  #21  
Old 03-30-2018, 11:13:32 PM
Heins Heins is offline
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Default Re: Daewoo Forklift - Lift Cylinder Repair

I was wondering if it was going to clear the chain and hoses.
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  #22  
Old 03-31-2018, 09:23:39 AM
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Default Re: Daewoo Forklift - Lift Cylinder Repair

When you had the gland nut off, did you see how much smaller the dia of the ram is than the ID of the barrel is? That is why the oil can get to the bottom end of the ram.
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  #23  
Old 03-31-2018, 10:45:49 AM
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Default Re: Daewoo Forklift - Lift Cylinder Repair

Now that everyone knows how a single acting cylinder works, it is time for a quiz.

How do you replace the seal in this cylinder? It has a wiper seal and an "0" ring to seal the oil in the cylinder.
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  #24  
Old 03-31-2018, 03:24:21 PM
dalmatiangirl61 dalmatiangirl61 is offline
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Default Re: Daewoo Forklift - Lift Cylinder Repair

Clearance between chains and cap is very close, I was not sure it was going to work until I got the chains/hoses back in place. Had a friend watch it closely as I raised/lowered it a few times, one of the chains barely touches it, but not enough to worry about. If I had to do it again, I would have left center hole in cap a little bit smaller and pressed it onto rod. Stainless started work hardening and last cut ended up a wee bit larger dia than I had planned.

There was 1/4" to 3/8" gap between cylinder and rod, and to my surprise gland nut is solid brass. All in all it was an easy fix, certainly much easier than pulling the whole cylinder. My only gripe is the backup ring for the O-ring on OD of the gland nut, why can't they make those things out of something with a bit more flexibility? I put it in hot water, carefully got it over threads, then had to get it over a lip before it would go into groove, of course it broke. Used the old backup ring, it was broken too but less deformed, so far it is not leaking.

As for the quiz, let me guess, it is welded and the only way to rebuild is to cut it apart? Second guess would be one of those wire circlip things that you have to pry one end up then pull out of the groove with some side-cutters pretty much destroying it in the process, those are lots of fun too!
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Last edited by dalmatiangirl61; 03-31-2018 at 05:15:13 PM.
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  #25  
Old 03-31-2018, 06:04:19 PM
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Default Re: Daewoo Forklift - Lift Cylinder Repair

It is a welded cylinder, but you don't have to cut it apart and no circlip. Try again.
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Old 03-31-2018, 06:29:37 PM
dalmatiangirl61 dalmatiangirl61 is offline
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Default Re: Daewoo Forklift - Lift Cylinder Repair

Pry out with a pick and try to shove them back in without tearing. If its double acting, and welded, how would you replace piston seal short of cutting it open?
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Old 03-31-2018, 09:49:12 PM
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Default Re: Daewoo Forklift - Lift Cylinder Repair

It is a single acting cylinder, the ram will come all the way out so you can replace the "O" ring and the wiper seal. It doesn't have any seals or cup on the lower end like yours.
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Old 04-01-2018, 11:56:05 AM
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Default Re: Daewoo Forklift - Lift Cylinder Repair

Here is a hint.
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  #29  
Old 04-01-2018, 12:08:56 PM
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Default Re: Daewoo Forklift - Lift Cylinder Repair

Rebuilt my pallet jack with no piston on the ram. Didn't even have a gland to remove at the top. Just pulled the ram out by hand, dug out the seals with a pick, rolled new seals in, greased them up and pushed the ram back in. Took all of about 10 minutes including cleanup.

Rebuilt my Hyster last month and wasn't quite so easy, or lightweight:

Repacked every cylinder, replaced every wear bearing and slide pad, and had to retube one lift cylinder. Good and strong with no leaks now.
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  #30  
Old 04-01-2018, 01:51:12 PM
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Default Re: Daewoo Forklift - Lift Cylinder Repair

On your pallet what kept your ram from blowing out of the barrel? It probably couldn't travel far enough.
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