How to repair your hydraulic jack

[@rudigerk.587]

As I had Oil leak at my DK20 from 2009 I was looking forward how to repair it. As I found this Video I was happy and ordered the repair kit. When I received it there was more in the kit as i needed and some things are not explained in the video but it was very helpfull and my hydraulic jack is working fine again.

[@noelmccarthy7036]

Great jack. The only suggested improvement would be to change the material of the oil hose. After about 9 years the material just completely disintegrated and hence the piston cylinder leaked everywhere.

[@ACHydraulic]

Thank you for the input, we'll pass it on to our quality department.

[@ACHydraulic]

We spoke with the quality department, and they have never seen this issue before.

[@noelmccarthy7036]

@@ACHydraulic possibly it's a problem in high temperature/high humidity environments. Anyway that's what happened.

[@steveskeoch4860]

@@ACHydraulic ​ Just happened to me. 10 years old. The hose cracked right under the hose fitting. Seems like it should be easy to replace the hose, but there is not a spare part for it online that I could find. Do you know of a suitable replacement hose or at least the specs on the fittings? I ordered a "oil hose" from HCRCnow, but got just a useless soft rubber hose with no fittings, not a hydraulic line that I was expecting.

[@MotecM]

Just had my oil hose crack too. Jack is just over 10 years old and only gets used once or twice a year…

[@pellfan]

Thanks! 👍😃

[@StuartAppleby]

My side inline hose was also brittle and caused failure of the jack. I went to Pirtek that make hydraulic line/couplings and showed him what I needed. He had some line 5/16th" or 8mm ( he wasn't sure if it would work) It fit inside the brass collar on each the ends just like the OE version (I pushed the hose a very small amount past collar so it would get pressed/pinched to fitting when tight)......so I took the risk it would perform and he ended up giving me a left over section maybe couple yards long... it was a pretty stiff tubing for its size, but not sure what it was exactly. I had ages ago bought a repair kit, and to decided do only the rings out of the kit (didn't have small magnet tip for ball removal). My jacks the 2,800lb 1,300kg long reach so was different to the way he reassembles this jack in vid as the cranking pin sits more inside the frame so harder to refit and required taking the side control arms off and partially pulling the jacking arm up and locking a piece of wood under lifting arm so I could get to refit holding the big pin I also made up of crank piston retraction lever like they had so I could drop and blocking pin like they show. I didn't need anything but grunt for the compression of the long piston spring to get the cap on.. So did the rings and filled it up and noticed after many pumps .... nothing happening...you kidding me. ..looked for a hose leak, and nothing. I kept cranking for what felt ages and then it rose up perfectly. I guess the air has to be eventually push raw oil around to the pressurised side. Would've been nice for the vid to mention this endless cranking to get the job finished.

[@ACHydraulic]

The jack is self-bleeding when you activate the handle / pump piston

[@noelmccarthy7036]

At 10:58 the piston shaft/rod is not aligned to accept the grub screw in the adapter but then shortly after at 11:03 it is. How is the piston shaft/rod rotated into the correct position?

[@ACHydraulic]

The adapter is locked in with the quill screw (red arrow), closest to the piston. You can rotate the adater until it is positioned properly. Afterward you tighten the other (yellow arrow) hex screw to the frame. See image here: i.imgur.com/azNsmQm.png

[@noelmccarthy7036]

@@ACHydraulic thanks very much for the reply. Just to clarify. It's safe to rotate the adaptor (with it locked into position by the quill screw) after reassembling the piston assembly so that the adapter aligns correctly with the other end of the piston assembly? With the air hose when I say disintegrated I literally mean that. Not just a tiny split it was broken into many, many fragments. I had the same issue with a Bendpak hoist and replaced it with a high quality hydraulic rubber hose. I'm hoping that if it fails it will just develop a small leak, whereas with plastic (polyethylene?) the leak is huge! The issue is probably worse in hot climates. Apart from that I'm really satisfied with the jack. I have some nice jack stands as well and will buy an engine hoist too. So, please pass on my thanks from an Australian customer.

[@noelmccarthy7036]

Hi again. All solved by following your instructions.

[@ACHydraulic]

The adapter can be rotated and fixed freely on the rod to fit the frame. I relation to the oil hose that has disintegrated, is not something we have seen before.

[@yannickdanger7416]

Bonjour excusez-moi de vous déranger j'ai fait l'entretien de mon cric est malheureusement il reste bloqué en position haute pouvez-vous me donner la cause cordialement Yannick

[@ACHydraulic]

Hi Yannick, please write to [e-mail] - we've made an e-mail ready with images and guideance. She speaks French.

[@frunp]

Hello! I have a DK20 from around 2000. It does not have the filling plug on the side of the cylinder, but on the face of the gland nut. How do I fill the proper amout of oil on this model?

[@ACHydraulic]

Hi. Please contact sales team for the correct manual according to serial number. You can find our contact information on our webpage.

[@dntlss]

I was wondering, I have a little floor jack that I really like and it has this problem where it goes up then down a bit, then up and done a bit while you pump it, what would cause that? It had a little air in it but I got it out but the valve where you pump the handle looks like it's leaking a tiny bit, could that be it?

[@ACHydraulic]

In relation to the question, I still think there is some air in the system. Please replace the sealing for pump piston and check the oil level is correct. Loosen no. 11 a little bit, to get the last air out of the system. I can't post an image here, but please find the manual here: www.achydraulic.com/support-media/manuals/ The assembly drawing will guide you to "item 11".

[@CorMars-u1k]

How can a best replace THE NUT and HANDLE ? TO THE CYLINDER How can I upload pictures to explain.

[@pavelyan1350]

Good afternoon, tell us what lubricant the wizard is using to assemble

[@ACHydraulic]

Hi Pavel, any good hydraulic oil of viscosity ISO VG 15 can be used. Never use brake fluid! You can find the manual on our website: www.ac-hydraulic.dk/pdf/manuals/dk13-20.pdf

[@Retaile23]

I just rebuilt my DK20 and I noticed that in the video the ram was fully retracted after being rebuilt but when being installed it was back at 1/3 extension. How did the ram get extended?

[@ACHydraulic]

By activation the pump piston, it´s only for making the mounting of cylinder easier.

[@LAWMotorsportsdotnet]

I've had a DK13HLQ for almost 20 issue free years. Last week, I needed the high lift jack to affix a bumper on a 4x4 truck and I could lift the bumper into position, but the jack wouldn't hold the position. It would drop as if I turned the handle to lower. It did the same thing with or without loading. I saw nothing that would indicate the release was stuck or locked. Any suggestions?

[@ACHydraulic]

Lowering with or without load indicates that the release valve is not closing properly. Please - again - verify that the release bracket is loose (with play) in all handle positions, and also that the release spindle retracts fully after release (does it change anything to push/tap on the end of the release spindle?).

[@dennisrogova3769]

Hej where can i buy parts for it ?

[@ACHydraulic]

You should be able to find a dealer from our website: www.achydraulic.com/locate-dealer/ If not let us know on [e-mail]

[@markosmarkos4621]

Good afternoon from Athens. Thank you very mutch for demostration repair of jack and Congratulation . My question. From wich i will spare parts O Rings and seals for DK 13HLQ 1,3 CAPACITY. ?????? Thanks again.

[@jangudiksen]

markos markos if you send an email to [e-mail] with information on your jack and where you live, they will guide 👍

[@techlab4066]

Where can I purchase a new oil hose? The service representation in Hong Kong is not helpful. DK13HLQ, purchased new in 2016. Sn 591510.

[@ACHydraulic]

For any sales or service related questions, please write [e-mail] - you'll get a fast reply. Thanks

[@techlab4066]

@@ACHydraulic I've sent an email to this address. Still awaiting a reply. The Hong Kong distributor has quoted me the equivalent of US$200. for the oil line. That seems egregious, greedy, unreasonable.

[@jangudiksen]

​@@techlab4066 the sales support team has received your email, you will hear from them soon

[@steveskeoch4860]

@@techlab4066 I agree $200 is too much for a hose that is only a few inches long. Hoping I can use a standard hydraulic line ordered from Amazon. Were you able to get a replacement part. I have the exact same jack: Model: DK13HLQ. Ser no. 512310, Built 2013/01

[@hksoundpro]

@@steveskeoch4860 I found a local Hong Kong company that makes custom lines for a wide variety of high pressure applications. Air Conditioning, hydraulics etc. They made up a perfect replacement which far exceeds the quality of the original line. Cost the equivalent of $13.00 USD. 👍

[@RJ330i]

What kind of grease is he using?

[@ACHydraulic]

Renolit greaseway CAH 92. The product is highly adhesive, penetrating, water resistant and can withstand heavy loads. Recommended for lubrication of sliding surfaces where it is practical to apply as a spray, such as bolts, chains and chassis surfaces. Classifications and approvals: ISO 6743:L-XC(F)CIB2 and DIN 51502: KP2K-30

[@b.m.9909]

@@ACHydraulic Is this grease safe for the O-rings and other seals? Looking for something equivalent as it appears this grease is not available in North America. I am finding Renolit greaseway CAH 92 (anhydrous, calcium thickened grease). Is this a mineral based oil? Is it compatible with polyurethane and other rubber seals? Thanks

[@b.m.9909]

@@ACHydraulic Is it okay if the grease migrates and mixes with the hydraulic fluid?

[@ACHydraulic]

@@b.m.9909Yes, it will happen on a smaller scale.

[@manuelavellaneda1698]

@@ACHydraulic DIN 51502: KP2K-30. (for example Liqui Moly 3347 )

[@subseawellhead]

Bought a repair kit but Oil transfer tube rotten. Can not find any tubing that will fit your compression fittings so jack still inoperable

[@ACHydraulic]

No. 31 is the part you need, it is not incl. in the repair kit. Item number can be found in the manual. Correct model must be chosen, due to the length of hose. Please find the manual on our website, or write your model+year og serial number here or by mail.

[@b.m.9909]

@@ACHydraulic But where can we get the tubing?

[@ACHydraulic]

@@b.m.9909 From your local dealer, found at www.achydraulic.com/locate-dealer/

[@b.m.9909]

@@ACHydraulic Thank you for the reply. My local dealer does not carry the tubing. I have sent a message to a dealer from your site and will see if they carry it. Update: I was able to locate the oil tubing from a local dealer that I accessed through the a AC website.

[@katolight]

My DK20 will raise but not release or go down. I’ve checked the release for proper adjustment, seems fine. The original problem was that the jack sometimes would hold a load and sometime wouldn’t Jack up at all. Found the air tube broken due to age I guess. Replaced the tube now the new problem. Will jack up and hold load but won’t release. I suspect it’s in the pump unit. Any ideas?

[@ACHydraulic]

Please verify the oil level as mentioned in the manual: up to the filling plug with horizontal unit and the ram fully in. Also - please check the release adjustment again.

[@katolight]

AC Hydraulic yep done that. Watched the videos and confirmed what you suggested.

[@patofdubois1]

@@katolight Hello Mr. Jones! Can you please contact me directly? My email is: [e-mail]

[@vipecrx]

Nice Video until you realise that the repair kit they sell you, eventually, doesn't come with enough seals for your jack.

[@ACHydraulic]

Is it an original gasket kit you bought? Either something was missing, or you have to elaborate on what it is that is missing? It's not a problem I've heard of before.

[@Goethetractor]

Ich habe gemacht: kzbin.info/www/bejne/oZfIaGWvrpaCf8U

[@songzhou]

I think I’ll just buy a new one