What size hydraulic lines ie (1/2 inch) and style fittings ( SAE) do they use on a PC50 or dose it depend on what line its going to. Thanks
Are you talking about a Komatsu PC50? I can't say for sure, but many Komatsu machine use JIS (Japanese Industrial Standard), 30 degree tapered fittings on hoses. They look similar to JIC, 37 degree tapered fittings, but that's where the similarity ends. Thread and taper are completely different. Here's a link for the JIS 30 degree fitting. http://www.parker.com/portal/site/P...E TO JIS B203 (BSPT)- STEEL&vgnextfmt=default
Yes it is a komatsu, im tring to find a "T" valve, some adapters and hoses.
A Tee valve? Can you give a little more description?
so i can switch between my off set boom and the thumb, that way i dont need to run other hyd lines or switch, just extend the lines
Not a bad idea! If you have Komatsu JIS fittings on you machine now, you should be able to get JIS to standard pipe thread fittings at your local hose supplier to adapt to standard pipe valves. There is a tee valve out there that would do what you want. It's normally used to change a single acting aux circuit to double acting. Let me make a phone call tommorow about this valve and I'll get back with you tommorow evening.
Thank you very much, i think it will be alot cheaper and quicker this way. I just got this machine, any info you can tell me is greatly appreciated. Thanks
Maybe cheaper than a complete auxiliary kit for your machine, but not necessarily cheap. These are not your typical plumbing type valves, and don't attempt to use standard plumbing valves, they can't handle high hyd pressure. I didn't get a chance to contact HKX today, but I did talk to Hyd Circuit Technology. The cost of a manual selector valve was around 400 bucks, and you would have to use two of them to rig your thumb. Locking handle high pressure ball valves are a little cheaper, around 130 bucks each, you would have to use 4 of them. Here's a pic (the one on the right) of the manual selector valve I'm referring to. This is from the HKX website. Give HKX a call and find out what this valve cost from them, also check the price of their locking handle ball valves. Here's their website. http://www.hkx.com/cms/index.php?option=com_frontpage&Itemid=1 If you rig your machine the way you described, using the boom offset cicuit to divert to a thumb, you need to keep one thing in mind; the circuit relief pressures for the offset boom cylinder will probably be fairly high, that's a big cylinder. When you divert the circuit to a thumb, you may be connecting a much weaker cylinder to the circuit, so you could damage the thumb cylinder if you roll the bucket into it, by clamping a load with the bucket, and the reliefs not pop open.
Best bet would be to fit an oversize/strength ram which could resist the pressure applied by the bucket cylinder and the pressure in the offset circuit so you don't bend the thumb ram when rolling the bucket towards it (as described above) or when closing the thumb against an object in the bucket.
What you might also see with that much flow to the thumb would be an overly fast acting thumb which makes grabbing objects delicately very difficult.
Your right, it could result in a fast acting thumb. That's easy to resolve with Parker adjustable needle valves in the thumb circuit.
I was thinking of using this thumb, yeah i'll need to check the difference in size to see if i need to use that adj valve.
Well i found out the flows of my machine, its like 6.5 GPM for the hydraulics, and only about 10GPM fore each track
Are you still going to tap into the offset boom lines to operate thumb? I think it's an excellent idea.
thats what my plan is, but with only 6.5 gpm i don't know what all i can run.
6.5 gpm is going to be plenty to operate a thumb cylinder.
6.5 GPM will run a small breaker so it should easily run your thumb cylinder especially when you consider that you are only likely to be slightly running one other function e.g. boom or bucket whilst closing the thumb so it should get a vast majority of the available flow rate.
Yeah, the thumb circuit is almost the same as the bucket flow. I'm just thinking what attachments i could run with the new circuit, do you guys know what is near 6.5 gpm flow? Thanks