Thank you! I'd not found this site. I'll try the Repair Manual first, and if it is the real thing, later the Operator Manual. I've been stung in the past with so-called Model Specific manuals that were no more than general repair information, applicable to just about any machine.
Thumb Plumbing excavator thumb
- Thread starter JerryCPP
- Start date
- Views: 16210
ptsg
Super Member
Does this make any sense to you? If you could find a serial number, so I could make sure I'm looking at the right stuff on that Russian website.
Diagram pump to valve:
Diagram Valve to Tank:
We need to confirm if the thumb valve have the Power Beyond port and the power beyond adapter for it. If it does have that, the easiest way then, is to use the pressure line of one of the pumps to feed the thumb valve. Then the thumb valve will feed the main valve through the Power beyond port with the power beyond adapter/sleeve installed. The tank line of the thumb valve, will then Tee into the original tank line.
Another solution, is to ditch completely the thumb valve. Instead, you would use a diverter valve hooked to the swing cylinder circuit (since it's not used that frequently) and use that instead.
Either way, you'll need a secondary relief valve for the thumb cylinder, on the extend port of the cylinder.
Diagram pump to valve:
Diagram Valve to Tank:
We need to confirm if the thumb valve have the Power Beyond port and the power beyond adapter for it. If it does have that, the easiest way then, is to use the pressure line of one of the pumps to feed the thumb valve. Then the thumb valve will feed the main valve through the Power beyond port with the power beyond adapter/sleeve installed. The tank line of the thumb valve, will then Tee into the original tank line.
Another solution, is to ditch completely the thumb valve. Instead, you would use a diverter valve hooked to the swing cylinder circuit (since it's not used that frequently) and use that instead.
Either way, you'll need a secondary relief valve for the thumb cylinder, on the extend port of the cylinder.
ptsg
Super Member
I can go there easily. It does show as Insecure but still works fine. Doesn't open weird popups with dodgy stuff like some sites.
I'm just using the site to check the diagrams, I'm not buying nothing, so no, I didn't use my credit card there.
You can browse through pretty much any Komatsu machine there. You don't have to create account or put any personal stuff there, unless you want to buy the manuals.
I'm just using the site to check the diagrams, I'm not buying nothing, so no, I didn't use my credit card there.
You can browse through pretty much any Komatsu machine there. You don't have to create account or put any personal stuff there, unless you want to buy the manuals.
BertZegers
Gold Member
- Joined
- Jan 2, 2012
- Messages
- 259
- Location
- South-West Ontario
- Tractor
- Kubota L2900, Zetor 8011, Kubota KX41Excavator, John Deere 4400 Combine, Case 1816C skidsteer
A relief valve P-T-P (pressure- tank-pressure, no check valve, only relief) could be plumbed in series into either cylinder port.
On the second picture you see a connector block with plugs where the hoses connect to the pipes. I took out one of the plugs and plumbed in the relief valve. The hose on the relief valve goes to tank.
Had the block not been there, then I would have plumbed the relief valve in series where the hose connects to the pipe. It doesn't make a difference if the relief valve is in the extend or retract line, because the pressure is equal on both ports. Only the flow is opposite for extend or retract.
On the second picture you see a connector block with plugs where the hoses connect to the pipes. I took out one of the plugs and plumbed in the relief valve. The hose on the relief valve goes to tank.
Had the block not been there, then I would have plumbed the relief valve in series where the hose connects to the pipe. It doesn't make a difference if the relief valve is in the extend or retract line, because the pressure is equal on both ports. Only the flow is opposite for extend or retract.
The web page I get only allows me to order shop manual or parts manual, at $99 each, for just about any Komatsu made. How did you get to look up parts without buying the parts book?
Thank you Takman - I found the site and was able to look at some information, and decided to purchase the repair manual they showed for $99.00 U.S. I ordered, paid via PayPal, and a day later got the money credited back. Apparently they didn't have the manual. I had to sign up with an email, name, and password to order. Now, I can't even look at the site without logging in, and can no longer look at the list on the left side. The directions say I must now subscribe for $99 PER MONTH! It was good while it lasted, and I do appreciate your taking the time to help me. The PC05? With what I was able to glean before the site went pay-to-look, help from you and others on this board, and many hours on line, I have the thumb problem figured out and parts coming to get it working correctly. Some day I'll go to the library or somewhere with a different web address and see if I can peek at some of those pages again.
Takman
Bronze Member
Cool, the thumb is awesome when you need it! Not sure what's up with having to pay? I've always just gone there and used the diagrams without logging in or anything. Sorry it was like that for you.
ericm979
Super Member
- Joined
- Nov 25, 2016
- Messages
- 5,817
- Location
- Santa Cruz Mountains CA, Southern OR
- Tractor
- Branson 3725H Deere 5105
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