Recent content by TheOldHokie

I cant speak to that specific tractor but many HST models (e.g L3901) do not have a clutch interlock. The HST interlock provides that function. Dan

No. The load check operates on the pressure out port. Example: When the loader is in a raised position pressure in the lift work circuit is held by the glands on the spool. They block both ports. If the spool is shifted to further extend the cylinder the glands are repositioned to divert pump...

I know this seems like a possibility but its a reverse flow check on the pressure out port. Your tests show that port is working fine. I can not visualize how the load check could block the return port. Dan

Yes, I looked at that yesterday. As I suggested remove and inspect it. Its just a one way poppet. Unfortunately, if its damaged replacements are NLA. I know in the past components (poppet??) from other valves have been successfully swapped in. Dan

I dont know what you guys are doing but when I asked Google "what happened on 9/11" I got this "AI" response and a long list of detailed references describing the event AI Overview On September 11, 2001, 19 terrorists associated with the extremist group al-Qaeda hijacked four commercial...

Indeed. My guess is they will simply throw a new loader valve at it. Dan

Yes - that thought did cross my mind but I cant formulate a failure. Thats the load check valve that holds the load side pressure untill pump side pressure rises to match. Its easy to examine.

In regen both ports get connected to full pump pressure and each other. The force diifferential across the piston displaces the rod causing oil to loop back to the base end so yes there is reverse flow between the ports but its all internal to the valve. In standard dump rod end return flow...

My bad again!! Yes both ports get pressure in regen. I should have realized that. This isnt making much sense. In regen there is no return oil. In standard dump return oil goes to tank. if the rod end coupker is working both directions I cant see how regen (posution 1) can't work. That's...

Forget that - curl works Repeat the dump test as I described and make sure you dont move to curl. Dan

So what does that tell you? It tells me there is a problem with the return side circuit. What could it pissibly be? My first thought is the coupler. Reconnect everything and curl the bucket. Put the bucket on the ground and this time disconnect the male quick coupler on the valve and leave the...

I should have guven you better instructions. Reconnect everything and fully curl the bucket. Now put the bucket on the ground so it doesn't dump of its own weight when you disconnect the rid end hose. Now repeat the test without raising the boom. You cannot curl the bucket with that hose...

OK - lets get our terminology clear. The bucket has two dump positions separated by a detent. Position 1 is fast dump or regen. In this position return oil from the cylinder is combined with pressureized oil from the pump to increase cylinder speed but at reduced dump force Position 2 is...

Lets start with a clean description of the bucket behavior. Does the bucket curl correctly? What does the bucket do when the joystick is moved to the first dump position? What does the bucket do when the joystick is moved to the second dump position? Dan

Number 1 - you cannot reverse the dump and curl connections. Number 2 - flow rate not pressure controls cylinder speed. Now put boom and bucket back as it was and lets start with some real diagnosis. Dan