Does anyone have a Bobcat 753 That could take a picture of wiring for me

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stevelil

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Yes, I do have the BOSS system.
ok i just uploaded the one of the shop manuals. it looks like your SN predates the schematics in the manual i just uploaded. but the schematic should be close
 

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stevelil

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it looks like your serial number predates the schematics in the manual i just uploaded, but it should be close to what you have. attached is a screenshot of the drawing legend / title block.
 

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theboss

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ok i just uploaded the one of the shop manuals. it looks like your SN predates the schematics in the manual i just uploaded. but the schematic should be close
So, looking thru that manual i am following the hydraulic flow and they all show a diverter valve which I don't see anywhere. By this chart the 2 solenoids I have on top should my auxiliary solenoids. This picture is actually upside down from what i have. #11 would be at 7 o'clock position.
1674910442757.png
 

stevelil

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I just read through your original post. are you having a problem, or are you just concerned about a disconnected cable? I ask because many of these machines use a universal harness, and some functions are optional, based on how the customer ordered the new machine. My 753 has multiple connectors hanging loose and not connected to anything
 
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theboss

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I just read through your original post. are you having a problem, or are you just concerned about a disconnected cable? I ask because many of these machines use a universal harness, and some functions are optional, based on how the customer ordered the new machine. My 753 has multiple connectors hanging loose and not connected to anything
So, I discovered my auxiliaries weren't working when I connected my plow for the first time. So, I lifted the cab and the wires coming out of the lever tube from the switches were just lying there no connectors or anything just strait cut wires. So, I can't figure out where the connection from the switch is supposed to go. the left and right switch have 3 wires coming out. the trigger has 2. The solenoids I have on top are 2 wire solenoids. I purchased the new updated auxiliary switch because my original was so corroded it didn't work. Now with the new switch the light lights up so all I have left is figuring out where these wires connect to and hopefully, I can angle my plow. I don't know there is a problem yet.
 

little_fellow

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508611787

From what I can tell I believe it is a 1990. I can't find any diverter valve which is what all the schematics I find have.
I believe the diverter valve is right there in your own picture where you are showing the loose wires. the loose wires are from 2 solenoids and the solenoids are mounted on the diverter valve. I'm not a mechanic so I'm not 100% sure.
 
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theboss

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I believe the diverter valve is right there in your own picture where you are showing the loose wires. the loose wires are from 2 solenoids and the solenoids are mounted on the diverter valve. I'm not a mechanic so I'm not 100% sure.
From what I can find online the diverter valve would be an aluminum brick but they were optional and I believe only used if you have rear auxiliary which I do not but I have no idea. This hydraulic setup is all new to me. My last one used clutches and only had a pump for the rams my problem I believe is none of the books cover my serial and I can't get any info from bobcat on this to find out where to start tomorrow I will be diving back into this and hooking everything back up and manually going to trigger the solenoids and see what happenes
 

stevelil

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So, I discovered my auxiliaries weren't working when I connected my plow for the first time. So, I lifted the cab and the wires coming out of the lever tube from the switches were just lying there no connectors or anything just strait cut wires. So, I can't figure out where the connection from the switch is supposed to go. the left and right switch have 3 wires coming out. the trigger has 2. The solenoids I have on top are 2 wire solenoids. I purchased the new updated auxiliary switch because my original was so corroded it didn't work. Now with the new switch the light lights up so all I have left is figuring out where these wires connect to and hopefully, I can angle my plow. I don't know there is a problem yet.
I also had to replace my right side handle due to a corroded switch. New one shown in this photo.
Now that I'm looking at my machine to take these photos for you, I remember that the old one that I removed had loose wires Also. Are you loose wires simply cut or do they have weatherpack terminals crimped onto them?
 

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stevelil

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Here is an electrical schematic for 753 with BOSS option. However it starts with SN 512716001 and was printed in October 2000 so it may not match your machine perfectly
 

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theboss

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So did some work on this. Manually powered the solenoids on top of the valve assembly and they both click. So I decide to start it and turn the auxiliary on and power a solenoid and no movement
 

little_fellow

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So did some work on this. Manually powered the solenoids on top of the valve assembly and they both click. So I decide to start it and turn the auxiliary on and power a solenoid and no movement
It could be the control module is defective. I've had that problem before. Everything was working except the auxiliary part. Took me a long time to replace it because there is no way to diagnose the control module .unless you can switch it with one that is working. I checked everything I could before finally replacing the module with a new one. They are kind of pricy. This was back in 2017 and after I posted my progress on this forum, there was a forum member by the name of mmsllc claimed he had a parts machine that would probably have that exact part on it. Hope this helps. Good luck.
 
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theboss

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It could be the control module is defective. I've had that problem before. Everything was working except the auxiliary part. Took me a long time to replace it because there is no way to diagnose the control module .unless you can switch it with one that is working. I checked everything I could before finally replacing the module with a new one. They are kind of pricy. This was back in 2017 and after I posted my progress on this forum, there was a forum member by the name of mmsllc claimed he had a parts machine that would probably have that exact part on it. Hope this helps. Good luck.
Not entirely sure but I think since I powered the solenoid manually that would rule out everything to the valve block. But I only could power 1 solenoid at a time. I'm not sure how this system works because this is like a non existent 753 maybe both solenoids need power
Who knows.
In the manual when I look at the hydraulic flow operation the only time the auxiliary solenoids are mentioned is in the "optional diverter valve" section and I don't have a diverter valve
 

little_fellow

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Not entirely sure but I think since I powered the solenoid manually that would rule out everything to the valve block. But I only could power 1 solenoid at a time. I'm not sure how this system works because this is like a non existent 753 maybe both solenoids need power
Who knows.
In the manual when I look at the hydraulic flow operation the only time the auxiliary solenoids are mentioned is in the "optional diverter valve" section and I don't have a diverter valve
I did a google search for 753 bobcat diverter valve and it's showing the valve where the 2 solenoids are mounted on.
 
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theboss

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I did a google search for 753 bobcat diverter valve and it's showing the valve where the 2 solenoids are mounted on.
Everything I found is an aluminum brick mounted right in front of the valve assembly above the right front wheel motor
 

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little_fellow

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Everything I found is an aluminum brick mounted right in front of the valve assembly above the right front wheel motor
What I am trying to say is that the valve assembly is your diverter valve. I'm not sure what the aluminum one is, I don't have that on my 773 . You could be right . That looks like a Hydraulic pressure relief valve. Must be handy for when you need to relief pressure out of the system.
 
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