Rear implement drops to ground if I let go of position control - L-series

[SouthernSky]

Boxblade drops to ground unless I strap the position control lever towards the back with a bungee cord nor hold it in my hand.
No problem with raising or lowering, as long as my hand is on the lever, so it may not be a hydraulics issue.
It just won't stay in place when I let go of the position control lever and rapidly drops from the weight of the implement.

No draft control lever on this L-2650.

I checked the troubleshooting in the Workshop Manual but it really isn't clear on what to look at first.
Problem is the same whether engine is on or off (but of course won't raise when power is off).

Any suggestions? I keep breaking bungee cords ...

 

[Roadworthy]

It sounds as though the lever may be moving on its own. If that's the case look for some kind of friction adjustment at its pivot to hold it where you put it.

 

[K5lwq]

I would start by tightening the nut on the lever pivot point. Also sounds like you need to adjust the rate of fall knob under the seat.

 

[SouthernSky]

The raise and lower speed appears to be normal. And the nut on the other side of the round bar that goes across the back is rusted tight.

I’m going to put some penetrating oil on for a short period and see if I can loosen it and then retighten the nut.

I’ll post back if that works.

 

[LD1]

Yes there should be a nut/bolt where the lever pivots. Most common setup is a friction washer to hold position.

This is assuming the lever itself is lowering, which is what's causing the implement to drop

 

[SouthernSky]

I did notice I was missing the wingnut with built-in bolt on the position control lever. But I think that is just a stopper. I haven’t figured out where the tension stopper is to keep the lever from rolling forward. It stays in place when there is no implement in the back so I feel it is the weight of the implement that is the problem. Workshop Manual says it might be an O-ring issue behind the speed knob. Might check that next.

 

[K5lwq]

Could You post a picture of the position lever where it goes onto the shaft?

 

[K5lwq]

Click on the link below to the parts diagram. Find and loosen the jam nut 090. Then tighten the nut 080 some. The lever should be harder to move. Continue tightening until you have good resistance. Then tighten back up the jam nut 090. This should correct the issue. Good luck.

https://www.messicks.com/report/topdf?name=ku-85289-218540-352417&url=https%3A%2F%2Fwww.messicks.com%2Freport%2Fcc_diagram%3FVendor%3Dku%26ModelId%3D85289%26diagramId%3D352417%26sectionId%3D218540%26sectionName%3DHYDRAULIC%2520SYSTEM%26diagramName%3DT11100%2520FEED%2520BACK%2520LEVER