Forum Replies Created
-
Posts
-
I could not figure out how to copy the link but it is
– old forums
-buldozer mods
-dozer blade lift cylinder mod
-posted 2009/5/25
Check Valves with close fitting pilot piston shuttle to offer dependable cylinder locking in both directions. They permit free flow from valve port to cylinder port (or to portion of circuit) through one check valve while at the same time piloting open the check valve on the other side to allow reverse flow. When pressure at the valve ports is removed both check valves close and lock against movement in either direction by preventing reverse flow.
Got it
A standard “one way” check valve is what most people are used to.I want to install a Cat.2 hydraulic toplink to use with a quick hitch. It is a pain huge pain trying to line up the top connection each time I want to change implements. (hope I have all my retrofits completed before spring)
OK, so the unit with the check valve will hold the cylinder in place. In effect, a double acting check valve? allowing flow when the control is activated in either direction but not allowing flow once set? When I think of check valve, I think of flow in one direction only.
I am working on a on a hydraulic pump retrofit for a JM604. Swapping the OEM pump (CBN314 for a CBN320) for a higher capacity pump to run the loader. One thing I have done is install a relief off the pump discharge prior to any valves or quick connects. The plan is to run it to a return line to the sump along with the return from another circut I am installing. It may not be a good idea to run the return through a remote quick connect. I do not believe it will function unless you engage the remote valve amd select the correct quick connect. It may be possible to find another point to install a return to the sump. I am installing a tee on the drain point to the hydraulic sump (there are only two points to return that I can find, the sump vent and drain). The new circut will return on one side of the tee and the drain pulg on the other.
I have a Murphy oil switchgauge on my dozer and it works well. I am going to try this set up on the tractor. The oil sensor should buzz until the oil pressure is up on start up, will proof the temp sensor prior to installing. Will see if there is a way to hook up a light. The prime motivation was cost (less $40 all in, to Canada) and think it is cheap insurance. Had the temp on the dozer go to 100 C last summer, caught it in time, but do not want a repeat and not happen to look down in time.
Also check your pressure @ the backhoe valve. When I retrofited mine with a hydraulic thumb I installed a pressure gauge on the discharge of the PTO pump
(should have also installed a relief valve before the quick connect, but that is another story) . I found that I was operating at 3200 psi. Dropped it back to 2200 psi. Much less banging around, power was still good.
You can take the chineese hoses in and have them cut (mine are one wire), they have fittings that will fit the ID & OD of the hose and install what ever type of fitting you want. The problem will come when the OEM hose fails and you have to find a fitting to connect to a pump, valve block or cylinder. They do exist and can be purchased, usually through special order from an industrial hydraulic supply shop.
Good point, will she push it? that is a lot of extra weight. The other thing I noticed, when I had the root rake on (teeth are about 8- 9″ – penetrating depth) is if you are on uneven ground you do not get yourself in a position where you get hung up and have dificulty truning or backing out. I found this out when working clearing the old orchard and building roads in the wioods. The extra blade length will limit your mobility if things are not relatively flat.
