D21- 3 point creeps up

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   I bought this tractor not running. I have been doing a complete nut and bolt restoration on it. 
Rebuilt the engine, went throught every system and part, new seals bearings ETC.
I now have the tractor running and working out any bugs or leaks before I start to paint.

The Problem I have is when the engine is running around 3/4 throttle and higher the 3-point will start to raise. It does not matter what postion I have the control lever in, it has no effect on the 3-point till I throttle the engine back down.

I have taken the hydraulic spool valve assembly, manifold and traction booster valves apart-cleaned and resealed them. Everything looks okay, I must be missing something?

I have no linkage hooked to the traction booster valve, I have even removed the Traction Booster line and had it return to the sump and the 3- point still goes up on its own above 3/4 throttle. 

I have 1000 psi at idle and 2200 psi at full throttle.

Any help would be greatly appreciated.

I have tried to adjust everything on the hydraulic system and no change to the 3-Point 

I have an I&T shop Manal but it does not give the path of flow of the hydraulic system 

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Acdiesel Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 15 Jun 2012 Location: Rochester Ohio Points: 2535	Post Options Post Reply Quote Acdiesel Report Post Thanks(0) Quote Reply Topic: D21- 3 point creeps up Posted: 01 Jul 2024 at 11:11am
	I bought this tractor not running. I have been doing a complete nut and bolt restoration on it. Rebuilt the engine, went throught every system and part, new seals bearings ETC. I now have the tractor running and working out any bugs or leaks before I start to paint. The Problem I have is when the engine is running around 3/4 throttle and higher the 3-point will start to raise. It does not matter what postion I have the control lever in, it has no effect on the 3-point till I throttle the engine back down. I have taken the hydraulic spool valve assembly, manifold and traction booster valves apart-cleaned and resealed them. Everything looks okay, I must be missing something? I have no linkage hooked to the traction booster valve, I have even removed the Traction Booster line and had it return to the sump and the 3- point still goes up on its own above 3/4 throttle. I have 1000 psi at idle and 2200 psi at full throttle. Any help would be greatly appreciated. I have tried to adjust everything on the hydraulic system and no change to the 3-Point I have an I&T shop Manal but it does not give the path of flow of the hydraulic system
	D19 diesel,D17 diesel SER.3 D14 NF,D14 WF, D15 SER.II wf D15 SER.2 DIESEL,D15 ser.II nf D12 SER.I, D10 Ser.II 2-720'S Gmc,caterpillar I'm a pharmacist (farm assist) with a PHD (post hole digger)

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DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 19759	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Posted: 01 Jul 2024 at 11:40am
	Explain 1,000 psi at an idle and 2,200 psi at full throttle. Is this measured at a remote coupler outlet and activating a remote lever ?? Pretty sure your problem is this: normal backpressure in the hydraulic system with COLD hydraulic oil. By "cold" I mean less than 140 or 150 degrees F. I just had my One-Seventy on a tractor ride over the weekend and when I ran at full throttle with warm hyd oil for 20 minutes the hitch was half-way or more up. This is a normal thing and a dirty or small hydraulic filter would make it worse. Edited by DrAllis - 01 Jul 2024 at 11:43am

Acdiesel Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 15 Jun 2012 Location: Rochester Ohio Points: 2535	Post Options Post Reply Quote Acdiesel Report Post Thanks(0) Quote Reply Posted: 01 Jul 2024 at 12:08pm
	Yes, That pressure is by activating the remote valve. with cold oil. Everything is new: New filter and quality hyd. oil I even went as far as drilling the center hole on the Hydraulic filter housing a little larger to help the oil flow better. I used air to do bench testing on this hydraulic system and did notice that the port for the 3-point will build pressure if i restricted the flow on the return to sump line, that is what lead me to disassemble the filter housing and check to make sure the filter was not the issue and make sure that i did not put the by-pass in wrong. Agco filter # 70239930 I have the NAPA interchange filter on there now #1049 Thanks, Dan
	D19 diesel,D17 diesel SER.3 D14 NF,D14 WF, D15 SER.II wf D15 SER.2 DIESEL,D15 ser.II nf D12 SER.I, D10 Ser.II 2-720'S Gmc,caterpillar I'm a pharmacist (farm assist) with a PHD (post hole digger)

DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 19759	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Posted: 01 Jul 2024 at 12:31pm
	Everything is as it should be. The hitch won't lift anything, just itself.

Acdiesel Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 15 Jun 2012 Location: Rochester Ohio Points: 2535	Post Options Post Reply Quote Acdiesel Report Post Thanks(0) Quote Reply Posted: 02 Jul 2024 at 10:55am
	Thank's for your information! Edited by Acdiesel - 02 Jul 2024 at 10:56am
	D19 diesel,D17 diesel SER.3 D14 NF,D14 WF, D15 SER.II wf D15 SER.2 DIESEL,D15 ser.II nf D12 SER.I, D10 Ser.II 2-720'S Gmc,caterpillar I'm a pharmacist (farm assist) with a PHD (post hole digger)