Bobcat S650 Issues with Code M0721 and M0921and park brake

[tom_b]

I'm new to the forum but have used it for a resource from time to time. I have a 2014 Bobcat S650 with a few issues I cant seem to resolve but think they may be related.
The two codes I have showing are M0721 according the the book is hydraulic oil out of range high and M0921 fuel level out of range high.
I started with the M0721 code by replacing the hydraulic temp sensor. But that made no difference. I checked the Ohm's on the sensor I pulled out and it appeared to be functioning. I also changed the fluid and filters on the hydraulic system.
I have a new fuel sending unit for the M0921 code but after replacing the hydraulic temp sensor and no change I'm thinking that I may have something else going on since it seems that these two are on the same circuit.
Also the other issue I have is that the parking brake does not engage. When I flip the switch the light comes on but seems Dim but the machine will still move with the hand controls and if i'm on a hill the machine will role. I'm not sure if all of these items are related but looking to see if anyone has some guidance. Thanks for your help.

 

[brdgbldr]

I'm new to the forum but have used it for a resource from time to time. I have a 2014 Bobcat S650 with a few issues I cant seem to resolve but think they may be related.
The two codes I have showing are M0721 according the the book is hydraulic oil out of range high and M0921 fuel level out of range high.
I started with the M0721 code by replacing the hydraulic temp sensor. But that made no difference. I checked the Ohm's on the sensor I pulled out and it appeared to be functioning. I also changed the fluid and filters on the hydraulic system.
I have a new fuel sending unit for the M0921 code but after replacing the hydraulic temp sensor and no change I'm thinking that I may have something else going on since it seems that these two are on the same circuit.
Also the other issue I have is that the parking brake does not engage. When I flip the switch the light comes on but seems Dim but the machine will still move with the hand controls and if i'm on a hill the machine will role. I'm not sure if all of these items are related but looking to see if anyone has some guidance. Thanks for your help.

Could be a short in the wire harness. Not fun to try and find unless it is an obvious rub through.

Also check all of your grounding points, clean and tighten them including the battery. Check fuse and relay contacts.

 

[ZekeSkyree]

I second checking for bad grounds. If you have the wiring diagram, see if there is a common ground for the two items. Might be an easy fix. Best of luck!

 

[tom_b]

Could be a short in the wire harness. Not fun to try and find unless it is an obvious rub through.

Also check all of your grounding points, clean and tighten them including the battery. Check fuse and relay contacts.

I appreciate the feedback. I did previously clean all the grounds at the battery and the main ground to the frame but will start looking for other ground points.

 

[tom_b]

I second checking for bad grounds. If you have the wiring diagram, see if there is a common ground for the two items. Might be an easy fix. Best of luck!

I appreciate the feedback. I did previously clean all the grounds at the battery and the main ground to the frame but will start looking for other ground points.