New Holland LM 435 (Manitou derived) electro-hydraulic fault.

essexpete

Member
Location
Essex
Bit of a long shot. Has any one experience of the the New Holland/Manitou fitted with a manual joystick with the boom and 3rd service on electric buttons to pilot solenoids. The electrical part seems to have gone haywire. The boom in/out will work but carries on after button released for some time and seem more fierce than usual. The 3rd service will not work either way. The boom in/out movement will stop instantly if a 3rd service button is pressed momentarily. The third service will work in a similar way if I swap over the solenoids. It happened a couple of years ago and a local indi sorted it but he can't remember what they did.
 

ACEngineering

Member
Location
Oxon
Thanks that sounds like a plan of action. Could a poor earth/return be a problem?
if its using the 5th solenoid i mentioned on phone don't go powering that with 12volts as its a proportional one i think but the other 4 are normal 12volts on off.

send me some pics and the full long model number off the serial plate and the serial number, then i can get the parts drawing for the actual spec and see if they are using the 5th solenoid or not. I know the early yellow ones didn't but not seen a blue one to your exact spec before.
 

essexpete

Member
Location
Essex
if its using the 5th solenoid i mentioned on phone don't go powering that with 12volts as its a proportional one i think but the other 4 are normal 12volts on off.

send me some pics and the full long model number off the serial plate and the serial number, then i can get the parts drawing for the actual spec and see if they are using the 5th solenoid or not. I know the early yellow ones didn't but not seen a blue one to your exact spec before.
Thanks Ace.
 

essexpete

Member
Location
Essex
Update after someone, with more electrical knowledge than me, diagnosed a transistor blown in the PCB in the control box. Ace supplied me with a new control box and it is working properly again.
Just in case anyone else has a similar problem with this era of New Holland, the Manitou part was significantly cheaper than the New Holland price.
One of my customers subsequently looked at the blown board and reckons it can be repaired for pennies which will give me a spare.
 

glasshouse

Member
Location
lothians
Bit of a long shot. Has any one experience of the the New Holland/Manitou fitted with a manual joystick with the boom and 3rd service on electric buttons to pilot solenoids. The electrical part seems to have gone haywire. The boom in/out will work but carries on after button released for some time and seem more fierce than usual. The 3rd service will not work either way. The boom in/out movement will stop instantly if a 3rd service button is pressed momentarily. The third service will work in a similar way if I swap over the solenoids. It happened a couple of years ago and a local indi sorted it but he can't remember what they did.
Bloody dangerous that is
I nearly chopped someones legs off ehen the boom wouldnt stop going out.
I had to reverse sharpish
 

essexpete

Member
Location
Essex
Bloody dangerous that is
I nearly chopped someones legs off ehen the boom wouldnt stop going out.
I had to reverse sharpish
Indeed it is. The whole set up seems unnecessarily complicated for a machine that is, on the whole, relatively simple. The guy who came out had altered a Manitou in the past to operate the solenoids on the pilot spools with basic switching. I think/gather the reason for the rather complicated electronic control is to feather in and out the hydraulics to make the system less abrupt and more user friendly/safe in operation.
 

ACEngineering

Member
Location
Oxon
Update after someone, with more electrical knowledge than me, diagnosed a transistor blown in the PCB in the control box. Ace supplied me with a new control box and it is working properly again.
Just in case anyone else has a similar problem with this era of New Holland, the Manitou part was significantly cheaper than the New Holland price.
One of my customers subsequently looked at the blown board and reckons it can be repaired for pennies which will give me a spare.
£250 isnt bad though considering what you got, a box with board and all the wiring.

Especially compared to CNH price which was over £1000🙂
 

In conversation with a soil health pioneer

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In conversation with a soil health pioneer

Written by Janet Hughes



https://www.buzzsprout.com/1657363/8311877-janet-hughes-and-gabe-brown-the-six-principles-of-soil-health.mp3

In this month's Future Farming podcast, Janet Hughes talks to Gabe Brown.

Gabe has been named one of the twenty-five most influential agricultural leaders in the United States. He farms at...
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