ASV 120Forestry Keeps applying hand brake while in use

[Sophie007]

Hi, We have a 2-3 year old ASV 120F that we use with a FAE mulching head. It has started applying the hand brake while in operation. It mainly does it when reversing up slopes, once it starts doing it it keeps doing it continually to the point we can no longer use it. It shows no faults on the screen. Anyone have any ideas what could be causing this? Cheers

[Walnut Beast]

What did the dealer say

[Walnut Beast]

Did you get it new or used. Any reason your not checking with ASV service 

[kiko]

Does it have a seat safety switch? On my skid steer when I come off of the seat it applies the park brake. These have been known to malfunction.

[Walnut Beast]

Could be the lap bar not getting seated or coming up

[Walnut Beast]

Hi, We have a 2-3 year old ASV 120F that we use with a FAE mulching head. It has started applying the hand brake while in operation. It mainly does it when reversing up slopes, once it starts doing it it keeps doing it continually to the point we can no longer use it. It shows no faults on the screen. Anyone have any ideas what could be causing this? Cheers

Welcome to the Forestry Forum 

[Sophie007]

What did the dealer say

They dont seem to know too much, we only have a couple of machines in the country so I dont think they have worked on to many. Thanks

[Sophie007]

Did you get it new or used. Any reason your not checking with ASV service

Yes brought new. Have called service, as above... cheers

[Sophie007]

Does it have a seat safety switch? On my skid steer when I come off of the seat it applies the park brake. These have been known to malfunction.

Thought that initailly but not the case. Seems to get worse when its warm. Thanks

[Sophie007]

Could be the lap bar not getting seated or coming up

No not that either.... seems to get worse once its warm. thanks

[barbender]

Not ASV, but I have seen other skidloaders do this from a lap bar switch that was out of adjustment. Not the bar itself but the switch.

[Walnut Beast]

What did the dealer say

They dont seem to know too much, we only have a couple of machines in the country so I dont think they have worked on to many. Thanks

I'll check with my dealer and see if he knows anything about it

[kiko]

The park brakes are spring applied hydraulic release. There could be an issue with the brake release solonoid or the wiring to it , also the brake release piston seals could be leaking which would likely get worse as the oil get hotter/thinner.

[Walnut Beast]

Hello, what Country are you in ?  I talked to the dealer ( service)  and it could be a few things. Check the sensors on the drive motors if all wires are good. There is a hydraulic dump valve the dealer can get a gauge on. Does the machine actually stop to the point you have to hit the switch to release the brake. He said besides the other things that yes other guys have similar issues on steep slopes because the machine naturally will get put on when your off the controls so you need to be fluid when running the controls in them situations 

[kiko]

I would speculate that your machine could be lossing charge pressure. There should be a charge filter which is likely a cannister filter. I would remove the filter and look for metal flake first.  If there is pump failure , the more you run it testing it , the worse it will be.  I have dealt with catastrophic pump/motor failure on the rc100.  Ugly