no BH down pressure

[Bever22]

I have lost all down pressure on my 1570 BH which is mounted to my 1528. I push the boom joystick forward and the boom goes down, I push all the way forward and the boom will coast or float down with no force like the front end loader when it is on float. There is plenty of hyrdo fluid and all other functions on the BH and tractor work fine. with the left joystick pushed all the way forward it should drive the boom right into the ground but it does nothing. Anyone else have this problem? It is at the dealer now and they are trying to fix it.

 

[jeepcj7]

Its designed that way. You should be able to feel a detent before you push the lever that far. Original reason was for old three point mounted backhoes. If the top link broke the operators tendency would be to push the lever forward which would result in a nasty mess. Althought the reason may be obsolete, tha current standard, SAE J1518 MAY2003, still requires a float positon in the boom control:

4.2.1 CONTROL FUNCTIONAL REQUIREMENTS-On machines designed after the publication of this document, the boom control shall have four positions as follows:

Position A Moving towards the operator from neutral shall raise the boom.

Position B Neutral shall hold the boom's vertical position blocking both ports of the boom cylinder valve.

Position C Moving the control away from the operator shall cause the boom to lower.

Position D Moving the control further away from the operator beyond Position "C" shall enter a "float" position, or some other means shall be provided so that pressure is relieved from the end of the boom cylinder which forces the boom down. The valve control shall return automatically from Position "D" to neutral when released.

Not all manufactures follow this anymore, but they assume the liability if they don't.

 

[ray66v]

I never knew my GC2310 had this float bypass, until I tried to dig a hole at maximum depth once. I noticed it would go into float when I pushed it to dig at the limit.

 

[Bever22]

Thanks for the info, now I feel better

 

[ragkar]

On my JD46 BH, I don't have the forwards detent. I'll have to wait till the BH is attached to see if I have float however.

 

[Airic]

I was the same, took me a while till I realized I had a float on my BH. Its great for trench work and maintaining a specific depth.