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Vwcountry 
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Joined: 15 Oct 2025
Location: Ga.
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 Topic: Ac d17 series 3 lift arms down speed
Posted: 07 Nov 2025 at 4:36pm |
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The lift arms work just fine but when you let them down you can’t do it slowly it comes down like a hammer. Is this normal thanks
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DrAllis
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Joined: 12 Sep 2009
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Posted: 07 Nov 2025 at 5:52pm |
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I guess, yes. What exactly are you doing that causes you to complain?? A "rate-of-drop" valve could be installed in-line to adjust oil return to the sump while not affecting raise speed.
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Clay
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Joined: 11 Sep 2009
Location: Udall, Kansas
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Posted: 07 Nov 2025 at 6:07pm |
On the left hand side sheet is a one inch hole for the lowering adjustment. This is the LIFT_LOWER Lever Linkage adjustment knob. Turning the knob to the to the right increases the lowering adjustment. Turning it to the left slows the lowering adjustment. I have a series II D-17. Not sure if it applies to other series.
Edited by Clay - 07 Nov 2025 at 6:10pm
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DrAllis
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Posted: 07 Nov 2025 at 6:16pm |
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That adjustment screw only works when using the Traction Booster system, like on a mounted plow. If you've ever plowed, the plow still drops like a brick at the end of the field. That speed drop adjustment screw keeps the hand lever at the top of the bottom window and meters the return oil when the TBoost system is releasing the lift pressure. Early model D-17's did not have this, and the performance of the weight transfer system was lacking. So,this feature had to be created and works well if it is adjusted correctly. EDIT: I've never tried this but maybe it could work. If you screw that speed adjustment screw "in" (clockwise) as far as it will go, maybe the lift/lower lever stroke would be altered enough to where the hold valve plunger releases up higher into the mid-range of the levers stroke. Then, your hand could better control drop speed. Try it.
Edited by DrAllis - 07 Nov 2025 at 8:21pm
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Clay
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Posted: 07 Nov 2025 at 9:05pm |
I pulled out my operators manual and Dr Allis is right. It works with the traction booster.
Page 37 in my OPERATING INSTRUCTIONS. ADJUSTMENT(LIFT-LOWER Lever Linkage)
Effective on tractors D17 - 17846 and up, with the 1" hole in the left hand side sheet. 1. Place the TRACTION BOOSTER hand lever at bottom of quadrant. 2. With engine running, move the LIFT-LOWER lever to the lift position and unload pump. At this time pressure will be indicated on the TRACTION BOOSTER gauge. 3. Carefully lower the LIFT-LOWER lever until you feel the lever contact with the hold position valve plunger. Without releasing the pressure indicated on the TRACTION BOOSTER gauge, turn the lowering control adjusting nut (located through hole in left hand side sheet below fuel tank) counterclockwise until the LIFT-LOWER lever latches in the lower window on quadrant. Now turn the adjusting nut clockwise until the gauge pressure drops.
Edited by Clay - 07 Nov 2025 at 9:09pm
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HudCo
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Posted: Yesterday at 4:36pm |
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so how well will it work when their is 1/8 of an inch of slop in every conection from the snap coupler bell to the pump and quadrant wich equals about a third of the quadrat before the tail end of it reacts
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DrAllis
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Posted: Yesterday at 5:14pm |
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Probably not as good as if there weren't any sloppiness in the linkage. From the snap-coupler bell area not a problem but from the hand lever down inside the torque housing would cause some issues, yes.
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Vwcountry
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Posted: 9 hours 29 minutes ago at 9:07am |
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After further investigation, I’ve noticed this only happens if the lift is raised all the way up. Anything less than all the way up you can raise it slow. You can let it down slow but once you go all the way up then it is much harder to get it to release to go down then it drops like a concrete block.
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DrAllis
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Posted: 7 hours 37 minutes ago at 10:59am |
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You didn't say what you are doing when you experience this. When raising anything, once the lift arms or implements are fully up/raised, you are supposed to place the Lift/Lower lever out of the raise window and into the middle of the quadrant. If you leave the Lift/Lower lever locked in the raise window, the hydraulic pump is hammering itself to maximum pressure of 3400-3700 psi. Now, in order to get the load to lower, you have to open the hold valve ball off its seat with 3400-3700 psi of pressure against it. Placing the Lift/Lower lever in the middle of the quadrant first, will slowly allow the lift pressure to slowly dissipate and then the hold valve ball is much easier to open for easier lowering control. Again, what task are you performing ???????
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Vwcountry
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Posted: 30 minutes ago at 6:06pm |
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All I am doing is maintenance that was neglected. I purchased the tractor about a month ago. I you asked what I was doing actually nothing just changing all fluids greasing all joints rebuild carb then I noticed even with nothing on lift arms if you raise all the way up max it seems to put the hydraulic under severe pressure and you have to really pull hard to get it to release. I am not leaving the lift control in raised position it just happens if it goes all the way up. Sorry if I didn’t explain it very well.
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