Ls185b hydraulic problem !

[treyfox77]

There must be a relay controlling these solenoids. It may not work ..

Mike it is an enclosed cab , but funny you asked about this because the door was damaged and not on the machine when I bought it . I will look for this sensor or switch and report back !

 

[treyfox77]

There must be a relay controlling these solenoids. It may not work ..

Which relay would be the one to check that controls the boom and arm ?

 

[walio123]

Which relay would be the one to check that controls the boom and arm ?

I do not remember, and I can not now see what it is. I think there were three relays in total .... check them all .

 

[treyfox77]

I do not remember, and I can not now see what it is. I think there were three relays in total .... check them all .

Ok I will check them ...... I also just found out that I think I am missing the door safety switch ! I can’t seem to find one on the machine or the door that came wit it ...... would you happen to know the location exactly ?

 

[walio123]

Ok I will check them ...... I also just found out that I think I am missing the door safety switch ! I can’t seem to find one on the machine or the door that came wit it ...... would you happen to know the location exactly ?

This switch is located at the top point of the door rotation. it is different for different types of doors. Somewhere around the door frame on the side of the hinges there should be wires for this swith as well as for wiper . I was not right about relays,there are at least 8. I can not find a chart, and I can not remember what it is. I think it will not be difficult to figure out what it is.Disconnect the battery, disconnect the solenoid connectors. Remove all relays and check with a circuit tester. there should be no circuit anywhere in the relay slots. Then use jumper wire to conect the wires of the one solenoid connector, and circuit must appear in one of the relay slots.this is a relay that you need to check. Dont forgot to remove jumper wire before conect batery. Sorry for my bad English.

 

[Mike10]

This switch is located at the top point of the door rotation. it is different for different types of doors. Somewhere around the door frame on the side of the hinges there should be wires for this swith as well as for wiper . I was not right about relays,there are at least 8. I can not find a chart, and I can not remember what it is. I think it will not be difficult to figure out what it is.Disconnect the battery, disconnect the solenoid connectors. Remove all relays and check with a circuit tester. there should be no circuit anywhere in the relay slots. Then use jumper wire to conect the wires of the one solenoid connector, and circuit must appear in one of the relay slots.this is a relay that you need to check. Dont forgot to remove jumper wire before conect batery. Sorry for my bad English.

While walio123 has some good suggestions, however, he has gotten the wiring mixed up with the later models. The NH models can be confusing. The LS.B models are somewhat a hybrid of the prior LS models and the later L models Most of the wiring is like the late LS loaders and the early L models......................................................................................................................................................................................................... The power to the control valve solenoids starts at the 5A fuse in the engine fuse block. That is the same fuse which sends power to the seat switch and seat belt. Since the safety start circuit is working, then power should be reaching the instrument panel if the harness is intact. With the seat switch activated first, the seat belt second, power is sent to the instrument panel and when the ignition is turned on power is sent directly from the instrument panel to the control valve solenoids. Add a door switch and then a harness is added between the door switch and the control valve solenoids. If there is a door switch the harness should be noticeable at the control valve harness connectors................. .......................................................................................................................................................................................................................................................The door switch if it has one is on the left front cab pillar in the area of the latch, not the hinge side.........................................................................................................................................................Now it is possible there is some other input missing at the instrument panel, but you need to check the easy stuff first. It is important the seat switch and seat belt have not been tampered with or bypassed since the system needs to seen things done in the correct order before it will unlock the pedals. Seat switch first, seat belt second, key on after self test................ ...............................................................................................................................................................Are you pressing the operate button on the instrument panel to engage the hyd and release the brakes?............................................................................................................................................................If you are properly sitting in the seat with the seat belt connected and the key in the on position you should have power at pins 3--from the 5A fuse in the engine fuse compartment,..........23 & 24--from the second 15A fuse in the cab fuse block.................10--from the acc position of the ignition switch...............12--from the seat switch.............13--from the seat belt..............the output terminal from the instrument panel to the control valve solenoids is pin 14.

 

[Mike10]

While walio123 has some good suggestions, however, he has gotten the wiring mixed up with the later models. The NH models can be confusing. The LS.B models are somewhat a hybrid of the prior LS models and the later L models Most of the wiring is like the late LS loaders and the early L models......................................................................................................................................................................................................... The power to the control valve solenoids starts at the 5A fuse in the engine fuse block. That is the same fuse which sends power to the seat switch and seat belt. Since the safety start circuit is working, then power should be reaching the instrument panel if the harness is intact. With the seat switch activated first, the seat belt second, power is sent to the instrument panel and when the ignition is turned on power is sent directly from the instrument panel to the control valve solenoids. Add a door switch and then a harness is added between the door switch and the control valve solenoids. If there is a door switch the harness should be noticeable at the control valve harness connectors................. .......................................................................................................................................................................................................................................................The door switch if it has one is on the left front cab pillar in the area of the latch, not the hinge side.........................................................................................................................................................Now it is possible there is some other input missing at the instrument panel, but you need to check the easy stuff first. It is important the seat switch and seat belt have not been tampered with or bypassed since the system needs to seen things done in the correct order before it will unlock the pedals. Seat switch first, seat belt second, key on after self test................ ...............................................................................................................................................................Are you pressing the operate button on the instrument panel to engage the hyd and release the brakes?............................................................................................................................................................If you are properly sitting in the seat with the seat belt connected and the key in the on position you should have power at pins 3--from the 5A fuse in the engine fuse compartment,..........23 & 24--from the second 15A fuse in the cab fuse block.................10--from the acc position of the ignition switch...............12--from the seat switch.............13--from the seat belt..............the output terminal from the instrument panel to the control valve solenoids is pin 14.

If you want a pdf of the wiring diagram relevant to the starting of the engine, which also shows the control valve solenoid, then go to haytalk.com. Choose forums from the menu bar and then choose machinery. At the top of the list of posts are some pinned posts. Choose the pinned post on NH Repair etc. The page will be a list of information I have uploaded to the site. Scroll down this list until you reach the skid loader section. In that section is a link to late LS and LS.B wiring schematics. You will have to join the forum in order to view the link, which is painless, and then you can read any of the links there. I put the pdf together by arranging four frames and then adding different colors to each of the wire circuits. Each page adds the next circuit involved in starting the engine. The solenoids are present in the right frame with which wire activates them from the instrument panel. The control valve solenoids are shown as items 31 and 32 with the power circuit coming from pin 14 hydraulic interlock out.

 

[Mike10]

If you want a pdf of the wiring diagram relevant to the starting of the engine, which also shows the control valve solenoid, then go to haytalk.com. Choose forums from the menu bar and then choose machinery. At the top of the list of posts are some pinned posts. Choose the pinned post on NH Repair etc. The page will be a list of information I have uploaded to the site. Scroll down this list until you reach the skid loader section. In that section is a link to late LS and LS.B wiring schematics. You will have to join the forum in order to view the link, which is painless, and then you can read any of the links there. I put the pdf together by arranging four frames and then adding different colors to each of the wire circuits. Each page adds the next circuit involved in starting the engine. The solenoids are present in the right frame with which wire activates them from the instrument panel. The control valve solenoids are shown as items 31 and 32 with the power circuit coming from pin 14 hydraulic interlock out.

If one of the solenoids is defective, the instrument panel will cut the power to the solenoids. On earlier models, a fault would be displayed, but on the instrument panel in that loader it will not. Unplug one solenoid and see if the other one will release when you turn the key on. If not, plug the first solenoid in and unplug the second and retry.

 

[treyfox77]

If one of the solenoids is defective, the instrument panel will cut the power to the solenoids. On earlier models, a fault would be displayed, but on the instrument panel in that loader it will not. Unplug one solenoid and see if the other one will release when you turn the key on. If not, plug the first solenoid in and unplug the second and retry.

Mike I guess I need to ask first if this machine is an enclosed cab and has a door , it would have to have a door safety switch correct . Also I did provide power to the solonoids via power probe and they were working .

 

[treyfox77]

Mike I guess I need to ask first if this machine is an enclosed cab and has a door , it would have to have a door safety switch correct . Also I did provide power to the solonoids via power probe and they were working .

Also would the switch be mounted on the door itself or on the body of the machine ?

 

[walio123]

While walio123 has some good suggestions, however, he has gotten the wiring mixed up with the later models. The NH models can be confusing. The LS.B models are somewhat a hybrid of the prior LS models and the later L models Most of the wiring is like the late LS loaders and the early L models......................................................................................................................................................................................................... The power to the control valve solenoids starts at the 5A fuse in the engine fuse block. That is the same fuse which sends power to the seat switch and seat belt. Since the safety start circuit is working, then power should be reaching the instrument panel if the harness is intact. With the seat switch activated first, the seat belt second, power is sent to the instrument panel and when the ignition is turned on power is sent directly from the instrument panel to the control valve solenoids. Add a door switch and then a harness is added between the door switch and the control valve solenoids. If there is a door switch the harness should be noticeable at the control valve harness connectors................. .......................................................................................................................................................................................................................................................The door switch if it has one is on the left front cab pillar in the area of the latch, not the hinge side.........................................................................................................................................................Now it is possible there is some other input missing at the instrument panel, but you need to check the easy stuff first. It is important the seat switch and seat belt have not been tampered with or bypassed since the system needs to seen things done in the correct order before it will unlock the pedals. Seat switch first, seat belt second, key on after self test................ ...............................................................................................................................................................Are you pressing the operate button on the instrument panel to engage the hyd and release the brakes?............................................................................................................................................................If you are properly sitting in the seat with the seat belt connected and the key in the on position you should have power at pins 3--from the 5A fuse in the engine fuse compartment,..........23 & 24--from the second 15A fuse in the cab fuse block.................10--from the acc position of the ignition switch...............12--from the seat switch.............13--from the seat belt..............the output terminal from the instrument panel to the control valve solenoids is pin 14.

Check here.https://partstore.construction.newholland.com/us/parts-search.html#epc::model_find.Find your model

 

[Mike10]

Check here.https://partstore.construction.newholland.com/us/parts-search.html#epc::model_find.Find your model

The door switch was not standard equipment initially, so you may not have a switch. If there is only one harness going to the control valve solenoids, then you do not have a door switch. The instrument panel is set up to protect itself, so if it detects a load in excess of the parameters, the instrument panel shuts off power to the solenoids. So it is possible for the solenoids to activate with the power probe and yet not with the instrument panel. I am not saying this is what is wrong, but something that should not be overlooked.

 

[treyfox77]

The door switch was not standard equipment initially, so you may not have a switch. If there is only one harness going to the control valve solenoids, then you do not have a door switch. The instrument panel is set up to protect itself, so if it detects a load in excess of the parameters, the instrument panel shuts off power to the solenoids. So it is possible for the solenoids to activate with the power probe and yet not with the instrument panel. I am not saying this is what is wrong, but something that should not be overlooked.

Mike is there a number I could reach you at to ask a couple questions ? Seems it would be faster .

 

[walio123]

Mike is there a number I could reach you at to ask a couple questions ? Seems it would be faster .

Surely nothing should be overlooked. If there is a switch at all, its wires must be close to the hinged side, as well as wiper wires. I doubt that a 5A fuse can keep a solenoid. I think it wil burn in a sec or two. There must be a relay and a fuse to be on the relay command circuit. I

 

[Mike10]

Surely nothing should be overlooked. If there is a switch at all, its wires must be close to the hinged side, as well as wiper wires. I doubt that a 5A fuse can keep a solenoid. I think it wil burn in a sec or two. There must be a relay and a fuse to be on the relay command circuit. I

For the wiring diagram just go to haytalk.com like I posted earlier. If one of the control valve solenoids shorts out bad enough, the 5A fuse is what blows. Been there done that. The solenoids are small and do not draw much current. There are no relays involved as you will see if you look at the wiring diagram. The door switch was a late comer to the game and may have not even been available at that time. I know I had to fabricate a door switch on a model around that age because none were available. It is easy to get confused about what was used cab wise on what models.. The cab on this LS185.B is basically the same as the LX models from 1995. Flat door with the windshield wiper at the top of the door. The door switch NH did eventually come with for these flat doors was mounted on the left front pillar in the area of the latch. To by pass the switch when the door was removed, you would rotate the switch 180 degrees so the button would contact and be depressed by the metal box the switch was housed in. At no time did NH have a switch on the hinge side with the flat doors. The later curved doors are a different story, but those only came into being in 2008.

 

[treyfox77]

Surely nothing should be overlooked. If there is a switch at all, its wires must be close to the hinged side, as well as wiper wires. I doubt that a 5A fuse can keep a solenoid. I think it wil burn in a sec or two. There must be a relay and a fuse to be on the relay command circuit. I

Ok guys , this machine must be an earlier model , it has no door switch , which explains why the door was damaged when I bought it . I have checked all fuses and relays and everything seems to be ok there . Valve at foot is still not releasing at all . As far as moving goes , the damn thing seems to have a mind of its own , it will move fine one minute , then shut down with no movement the next . It’s really all I can do not to light this b*tch on fire ! Lol kidding , anyways I was doing some more reading and have found there was a lot of issues with the instrument panels on these , could this be where my problems are coming from ? I mean seeing how it’s changing all the time . Is there a way to check to see if it is bad ? Thanks for everyone’s input , lord knows I’ve come miles since we started !

 

[Mike10]

Ok guys , this machine must be an earlier model , it has no door switch , which explains why the door was damaged when I bought it . I have checked all fuses and relays and everything seems to be ok there . Valve at foot is still not releasing at all . As far as moving goes , the damn thing seems to have a mind of its own , it will move fine one minute , then shut down with no movement the next . It’s really all I can do not to light this b*tch on fire ! Lol kidding , anyways I was doing some more reading and have found there was a lot of issues with the instrument panels on these , could this be where my problems are coming from ? I mean seeing how it’s changing all the time . Is there a way to check to see if it is bad ? Thanks for everyone’s input , lord knows I’ve come miles since we started !

Are you pressing the button on the instrument panel to activate the hydraulics and release the brake?

 

[treyfox77]

Are you pressing the button on the instrument panel to activate the hydraulics and release the brake?

Yes , when I press it the machine will move around for a bit then shut down ! I remembered you said that the valves at the foot get power from the instrument panel. Is that correct , seems everything points back at the panel......

 

[Mike10]

Yes , when I press it the machine will move around for a bit then shut down ! I remembered you said that the valves at the foot get power from the instrument panel. Is that correct , seems everything points back at the panel......

The next step is to make sure you have power at the terminals of the instrumen panel. Follow my wiring diagrams noting which wires have arrows pointing to the instrument panel. I am away from home for a few days so I do not have the diagrams with me. Sit in the seat, fasten the seat belt and then turn the key on. You should have power at all those terminals. You do not need to turn the key to start or check those terminals, since the system will unlock the pedals with key in the on position. If all those terminals have power and you push the button but the pedals do not unlock, then check the terminal with the wire going to the pedals. If all have power but the pedal terminal is not powered then it is likely the panel is defective. ..........when you say shut down, do you mean the hydros stop moving or do you mean the engine dies.

 

[treyfox77]

The next step is to make sure you have power at the terminals of the instrumen panel. Follow my wiring diagrams noting which wires have arrows pointing to the instrument panel. I am away from home for a few days so I do not have the diagrams with me. Sit in the seat, fasten the seat belt and then turn the key on. You should have power at all those terminals. You do not need to turn the key to start or check those terminals, since the system will unlock the pedals with key in the on position. If all those terminals have power and you push the button but the pedals do not unlock, then check the terminal with the wire going to the pedals. If all have power but the pedal terminal is not powered then it is likely the panel is defective. ..........when you say shut down, do you mean the hydros stop moving or do you mean the engine dies.

Mike the engine never dies , it will move momentarily and then shut down as in quit moving , still cranks and runs fine .