On 1/9/2016 12:42 PM, wrote:
> On Sunday, December 20, 2015 at 11:41:15 AM UTC-8, wrote:
>> On Sunday, March 1, 2009 at 6:23:08 PM UTC-5, Comboverfish wrote:
>>> Way back when, in one or more newsgroups, I suggested the blue 3.5 ton
>>> quick rise jack as sold by Sam's Club, to those who were looking for a
>>> cheap, functional, and strong floor jack for home use. I wanted to
>>> offer some tips I recently discovered when confronted with the problem
>>> of fixing or replacing mine due to low fluid level. It should be
>>> noted that I didn't "fix" it per se, but gave it a longer life. The
>>> seals, even if available, wouldn't be worth spending money on when
>>> this jack only leaks fluid a couple drops per year.
>>>
>>> Here's a pic I found so you know which jack I'm talking about:
>>> http://www.supermotors.net/getfile/3...e/P1010044.JPG
>>>
>>> Having topped off hydraulic jacks and other types of chambers before,
>>> this one turned out to be a bit more diffcult to fill than in past
>>> experiences.
>>>
>>> The symptom was that the jack would 'quick rise' OK, but after about
>>> 8" of loaded lifting, the functional stroke of the handle would start
>>> decreasing, and by the time it was near fully lifted, there would
>>> hardly be any stroke left.
>>>
>>> Here's how to refill it (there may be easier ways but I couldn't get
>>> it to work any other way):
>>>
>>> 1) Locate the magnetic parts bin and remove it from the jack frame.
>>> This will uncover the three threaded plugs that are used to adjust or
>>> service the jack. Look for the one "by itself"... IOW, two will be
>>> close together, and the third one will be spaced apart from them.
>>> Aquire at least one pint of new hydraulic jack oil. Don safety
>>> apparel and position the jack over some rags or something very
>>> absorbant. With the jack pad down and the handle valve released,
>>> unscrew this plug, accurately counting the turns until it is
>>> completely unthreaded. Do this slowly as fluid will come out under
>>> slight pressure; it will make a mess. If you pulled out the correct
>>> plug, it will have a small tip on the end of it that engages with a
>>> spring inside the plug hole. Be sure to remember the number of
>>> turns. Mine was threaded about 6.5 turns.
>>>
>>> 2) Kneel on the jack frame or otherwise keep it from lifting off the
>>> ground, then grab the lift pad/saddle with one hand while holding the
>>> oil bottle in the other hand. Keep in mind that as you lift the pad
>>> through it's arc, there are braces going through complex motions, so
>>> keep your fingers clear of this potentially pinchy situation. To
>>> avoid moving parts, you can grab only the pad and lift up this way,
>>> since it is made to stay in place (unlike with most jack saddles that
>>> are designed to interchange easily).
>>>
>>> 3) Very slowly lift the pad while drizzling oil into the plug hole.
>>> As you lift the pad/arm, the fluid level will lower in this hole. If
>>> you hear an "air sucking" noise, you went too fast and/or didn't add
>>> enough oil. Slower is better here.
>>>
>>> 4) Once you reach the top of the arm's range, you can push it slightly
>>> further and it will go into the "service lock" position. This will
>>> hold it up while you complete step 4. Now reinstall the plug
>>> temporarily, atleast a few turns to make sure it doesn't leak.
>>>
>>> 5) "Unlock" the arm and let it fall to the bottom under it's own
>>> weight and return spring pressure. Tighten the handle valve. Put
>>> pressure on the pad with one hand so the quick lift feature doesn't
>>> engage, and pump the jack up as high as it will go before the stroke
>>> becomes less than 100% effective.
>>>
>>> 6) Postured as you were in step 2, grab the pad with one hand and keep
>>> it in this position. Now open the handle valve with the other hand
>>> and lower the handle to the floor if it isn't there already. Remove
>>> the plug again while still holding the pad at this height. Repeat
>>> steps 3 through 6 until you find that the jack exhibits 100% strokes
>>> all the way up to full loaded position. This took me more steps than
>>> I cared to count, but probably because of all the trial and error. I
>>> would think you vould get it done in about 10 steps. It might take
>>> 1/2 hour at worst.
>>>
>>> I think the internal quick rise feature is why A) there are 3 service
>>> plugs and B) a standard reservoir fill and bleed wouldn't work for
>>> me. HTH.
>>>
>>> Toyota MDT in MO
>>
>> Or you can just pop the rubber plug at the top of the cylinder (visible with the magnetic tray removed), and add oil. I do it al the time until I rebuild it with new seals.
>
> I did this with mine and it worked fine for an hour or so, then the plug popped out. It did it twice. Why is this happening?
> Thank you!
> Jorge
>

Blocked/dirty/damaged (or in our case, improperly assembled
after rebuild) check valve.

http://www.hyjacks.com/H7.HTM

--
Andrew Muzi
<www.yellowjersey.org/>
Open every day since 1 April, 1971