Author Topic: Let's rebuild an old import Porta-Power ram -  (Read 283 times)

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Offline goodfellow

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Let's rebuild an old import Porta-Power ram -
« on: June 03, 2017, 08:55:19 PM »
While working on my Highlander I noticed that my almost 40 year old Taiwanese 4-ton Porta-Power was starting to leak at the end of the ram. I managed to baby it to get it to work, but the leak definitely got worse. Unlike traditional US made Porta-Powers, these Taiwanese import clones didn't have standardized parts; hence you can't readily find parts for these old units, but you can improvise and rebuild them.





First loosen the ram locking collar. I don't have the specialty socket to loosen it, so I just set a small punch into one of the socket grooves on the collar and use a hammer to rotate it counterclockwise and loosen. Once loose I found that a pair of body clip pliers will get enough bite to help turn it all the way out.



You don't have to remove the pressed on extension mount on top of the ram to get the collar off, but I just wanted to disassemble it totally, so I used a bearing puller to remove the top mount.



Next remove the hydraulic hose fitting



Once the fitting is removed, there is a hex head screw inside the hole which holds the return spring for the ram --





Now the ram can be pulled out





This is what the business end with the seals looks like -- notice the metal loop on the end? That's the return spring loop through which the hex head bolt gets screwed to hold the spring in tension.



This is what the spring looks like -- It doesn't have to be removed.



There is a C clip in the end of the ram to act as stop for the extended ram -- but it doesn't have to be removed;except mine was all gummed up and it didn't float at all. It was stuck in the groove.



The ram is easy to disassemble. Clamp the end-nut in a vise and use a small pipe wrench on the knurled top to loosen it -- not very tight.



This is the seal, spacer, and washer assembly.



Basically four interlocking pieces (a brass wiper, plastic wiper, second plastic wiper, and a phenolic material seal.





The phenolic seal is toast -- most of it is stuck to the shaft



The entire ram disassembled --



The phenolic seal is falling apart and making the ram leak





After some cleaning, the shaft itself is flawless



Realizing that I probably won't find a replacement phenolic seal, I improvised and decided to use a large "O" ring -- along with the old Phenolic seal. The deteriorated phenolic material was removed, and what remained was a brass base. I will use that brass base to squeeze the "O" ring against the lower plastic wiper to make it expand a tad past the plastic wiper. By tightening the nut just enough it will make the "O" ring expand and squeeze out to act as a seal .



This is the new seal package. Notice the old brass base on the far right which held the deteriorated phenolic material. I used it to put pressure on the "O" ring to make it act like a seal.



I lubed the ram and inserted it back in the receiver tube, and used a small screw driver to pull the spring end loop down far enough to reinsert the hex hold-down screw.



The hydraulic fitting was next - but I also added an ounce of hydraulic jack oil into that cavity to prime it. Basically to avoid draining the pump of hydraulic fluid before the ram is at full extension.



Finally the locking collar was screwed back in and tightened with a punch and hammer



Lastly I hooked up the pump and gave it a shot -- VoilĂ  --- it works like new. Pumps up nice and steady and no leaks.





This old unit and I have many years behind us and it was a great piece of equipment. I fixed a lot of cars with it, and wanted to give it another chance at life. It was purchased at a time when Taiwanese tools and equipment were just entering the US market. The unit was bought from an independent tool truck that sold a lot of Taiwanese tools back in the day.

« Last Edit: June 04, 2017, 09:33:49 AM by goodfellow »

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Let's rebuild an old import Porta-Power ram -
« on: June 03, 2017, 08:55:19 PM »

Offline fflintstone

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Re: Let's rebuild an old import Porta-Power ram -
« Reply #1 on: June 09, 2017, 01:16:40 PM »
 :worship: I was looking for a simple thumbs up. but this will have to do  :worship:
THE KING OF PARSIMONY WHEN BUYING TOOLS

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Offline goodfellow

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Re: Let's rebuild an old import Porta-Power ram -
« Reply #2 on: June 10, 2017, 03:17:54 PM »
Thanks Bill -- just wanted the old kit to last a few more years.

Offline Chase100

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Re: Let's rebuild an old import Porta-Power ram -
« Reply #3 on: June 13, 2017, 08:32:04 AM »
Nice work Goodfellow

That's one powerful looking jack!

Offline goodfellow

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Re: Let's rebuild an old import Porta-Power ram -
« Reply #4 on: June 13, 2017, 09:16:50 AM »
thank you! .. and welcome to the TAG site