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Bobcat T320 won't go into fast mode

amcphee

Active Member
Joined
Apr 11, 2023
Messages
27
Location
Augusta Georgia
Hello guys. My first post. I have a 2008 T320 that wont go into fast mode. No codes, Bobcat did not fix. Wondering two things? What could it be? I went through and disconnedted all connectors, cleaned them with Deoxit Gold. Have not tried it yet because I am cleaning up under the bab. Second thing, where can I get a shop manual for this unit. It has joysticks, not levers. G series
 

Mbar

Senior Member
Joined
Dec 15, 2018
Messages
263
Location
North Carolina
Local bobcat should print you off schematic page. That’s really all you need. Follow hoses out of drive motor to block with selonoid in it. One will be brake one will be two speed. Check for 12 volts when two speed is engaged. Controller is by your left foot. Use schematic to check input from joystick to controller and out put from controller to solenoid
 

amcphee

Active Member
Joined
Apr 11, 2023
Messages
27
Location
Augusta Georgia
Thank you Mbar for quick respons. They want to sell me the manuals and wont print off schematic page. I guess I will have to just ohm them out to see if I can find a bad solinoid. Are you saying there is one solinoid for fast and one for slow speed or there is a seperate line only for fast speed to the motors? My 331 mini x has the seperate high speed line actuated by a solinoid. Attachine the parts exploded view of the block. Do you happen to know which is which?
 

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Mbar

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Dec 15, 2018
Messages
263
Location
North Carolina
The block you are seeing there is the main control you need to trace your lines coming out of the motors and it will lead you straight to it. And no you only have one solenoid for high speed the other is for brake. If your are doing repairs yourself and not familiar with the working on these machines a shop manual is money well spent
 

amcphee

Active Member
Joined
Apr 11, 2023
Messages
27
Location
Augusta Georgia
Thank you sir. I am an electrical engineer and familiar with hydraulics, pneumatics and controls. I did purchase the full shop manuel, and it is definetly money well spent. The solinoid coils should be aournd 10.5 ohms. I am restoring the unit, and will check them out this weekend, weather permitting and let you know what I find.
 

Mbar

Senior Member
Joined
Dec 15, 2018
Messages
263
Location
North Carolina
As a side note bobcat controllers are notorious for loosing a single function. If you have to replace the controller it will have to be programmed once on the machine.
 

amcphee

Active Member
Joined
Apr 11, 2023
Messages
27
Location
Augusta Georgia
I tested the solinoids they were all areound 10 ohms, so likely not a bad coil. The machine is new to me and I bought it with the fast mode not working. The bobcat shop had the unit and they said they changed the controllers out and it made no difference. Still no fast mode. However, my experiance with the depth of knowledge of the technicians iat this bobcat place is that they are rgood procedure readers and parts changers, but not really good technically. Bobatak, have a procedure on how to enable fast mode? That may help.
 

bobatack

Well-Known Member
Joined
Feb 20, 2012
Messages
87
Location
Ontario, Canada
bobcat-deluxe-instrumentation-panel-close-hero_hs_low.jpg

if you have this type of display then the following should help
 

Mbar

Senior Member
Joined
Dec 15, 2018
Messages
263
Location
North Carolina
You need verify that you have 12 volts going to the coil when high speed is activated. Also changing a controller will not answer this question unless two speed is turned on on the new controller. If you know your controller has two speed activated and you have a wiring schematic and a meter this is about a 20 minute job to find the problem
 

amcphee

Active Member
Joined
Apr 11, 2023
Messages
27
Location
Augusta Georgia
More info. The codes that are thrown are both swash plates are out of range. Traced wiring and disconnected conectors, cleaned with Deoxit Gold and reconnected. Ohmed out wiring from swash plate sensor and servo valve connnections to computer.. No issues. Drew up the pin out to computer for later refrence.

Could his error cause it to not go into high speed.?

Going to check 12v to HS coil by doing as you said and tracing the motors to the right switching valve. Will let ya konw
 

amcphee

Active Member
Joined
Apr 11, 2023
Messages
27
Location
Augusta Georgia
Checked all the coils, they are all around 10 ohms. No issues. Wiring traced back to controller. All ok. Followed the motor hoses to a different than the one I showed above. It does have a solinoid on it and the solinoid checks 10 ohms.

Two codes thrown up that are left. Swashplate left and swashplate right out of range. Highly unlinkely both having issues, could it be it needs to be calibrated?

Will stry high speed test to see if I get 12 v and let you knoow
 

amcphee

Active Member
Joined
Apr 11, 2023
Messages
27
Location
Augusta Georgia
Disconeeced the coil on the smalll lines that come from the motor. Well, thats the Parking brake. It had 5 volts on it all the time. Reconnected it and the Parking light quit flashing.

As for the speed, hitting the rabbit increases up to 49 and wont go higher. The swash plates sill show out of range
 

amcphee

Active Member
Joined
Apr 11, 2023
Messages
27
Location
Augusta Georgia
Also, since this is a new machine to me I dont know the operator or master code. Is there a default one I can use to get into the machine? Do I need it to calibrate?
 

ozarkag

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Joined
Apr 25, 2018
Messages
233
Location
ozarks
Two codes thrown up that are left. Swashplate left and swashplate right out of range. Highly unlinkely both having issues, could it be it needs to be calibrated?
Worth a try to calibrate, if nothing else the failure code might shed some light. Although might not be able to calibrate with swashplate codes.
With your speed limited to 49% its possible its speed limited due to swash plate codes?

You don't need master code to calibrate. Only way to get is to take your serial number and proof of ownership to a dealer.
 

amcphee

Active Member
Joined
Apr 11, 2023
Messages
27
Location
Augusta Georgia
Attached are the drawings. I do not see any solinoid for high speed speed as you said MBAR.

The SN is A7wp12266 with the sjc option.
 

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amcphee

Active Member
Joined
Apr 11, 2023
Messages
27
Location
Augusta Georgia
I rean the hydrostatic pump calibration. During calibarion everything worked and the tracks ramped up to fast in both directions and ramped back down and stopped as the procedure said. However at the end of the calibration, the last step is to press the left joystick in the reverse positon till you hear beebs then reverse calibration is complete. Then "There will be an audible beep and the PRESS TO OPERATE LOADER and TRACTION lights will go out and the SEAT BAR and LIFT AND TILT lighst will remain on" I got the audible beep but the lghst did not go out.

75-39 and 75-41 swash plate sensor out of range high still in error. No fast speed.

HELP>>>>>>PLEASE
 
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