Bobcat 873

[Snowies]

Hello to everyone.
I have a Bobcat 873. Despite it's age it hasn't done that much work and is in pretty good condition.
Recovering from a shoulder replacement, the Bobcat sat unused for 5 or 6 months. It started straight away after this time, but the lift and tilt are unresponsive.
When I push the pedals the revs drop and it makes a noise as if the arms have already reached the end of their travel, but nothing moves. Oddly, the Aux ( that opens and closes the bucket) still works when I press the button on the right pillar, so I don't think the problem lies with the pump. The Boss screen displays no error messages.
The hydraulic fluid level is correct and there are no big leaks anywhere. It seems a bit weird that something can break when it is not being used.
Before I start looking at complicated solutions does the switch on the left pillar - activated by pulling the bar down - shut off the main hydraulics?
It would be great if it was something simple like that because the nearest workshop is 140Kms away and they won't do "house calls" meaning an expensive float just for a diagnosis.
Any suggestions would be greatly appreciated.

 

[SSdoxie]

The Boss system does not interface/monitor the safety interlock system so no code will show. The inline hydraulic locks for lift and tilt are not opening. These lock valves are activated by electric solenoid on the control valve. There is a control box bolted to back of the ROPS on Right Hand side of seat for the safety interlock system. Each circuit of the system has an indicator light, when working correctly all indicator lights will be on steady. If a circuit has not received a signal to the control box light will be off, if signal is received and there is some type of voltage interruption the light will flash.
The original design used a seat switch, the sequence was #1-Key ON to power the controller box (green light comes on), #2-Seat bar down (switch on the seat bar signals controller and green light is ON) #3-controller sends power through seat switch to verify operator in seat (seat light comes ON). #1 & 2 have to be working for #3 to work.
Most frequent problem of this system was debris getting under the seat preventing the seat switch making contact, so an updated version came out that changed the "Traction Lock" button if upper left front panel to an Override button that would override the seat switch.
Look at the front upper left panel, if the button is labeled "Push To Override" push it to see if loader starts working. Use the indicator lights on the controller to troubleshoot the system.

 

[Snowies]

SSdoxie,
Thank you for your advice. Please forgive the delay in getting back to you; I have been away on-site on a job for a few weeks and have not had the opportunity to respond.
The interlock control system lights show Power (solid green light) Seat (solid green light) but seat bar, valve and traction lights do not come on.
As you have indicated, this a sequential system where the seat bar switch must be activated before the others will work, so I'll find a new switch for the bar and see how this goes. Thanks again for your help.

 

[Snowies]

Well a new seat bar position sensor has been installed with no change to the issue.
The seat light remains on whether I am seated or not and a search has revealed ...there isn't a seat switch. So it comes back to the next step - the bar switch, but with no result.
Discussing this with the Bobcat dealer I was asked if it was installed correctly (?) which didn't exactly fill me with confidence in their advice because there is only one way to put it in.
P.S. The traction override has no effect.