Merlo 34.7 not releasing handbrake

[hubbahubba]

As above i thought the handbrake switch was on its way out but when the handbrake switch is on you cant push the plunger thing down at back of cab. Turn the handbrake switch off and it doesnt release but i can then push the plunger down and the handbrake goes off.

Ive tried swapping solenoids over with the difflock one but makes no difference, it still wont release on the switch.

Any ideas?

 

[Planttech]

As above i thought the handbrake switch was on its way out but when the handbrake switch is on you cant push the plunger thing down at back of cab. Turn the handbrake switch off and it doesnt release but i can then push the plunger down and the handbrake goes off.

Ive tried swapping solenoids over with the difflock one but makes no difference, it still wont release on the switch.

Any ideas?

Have you removed the square panel and looked at the contacts on the back of the switch? They are prone to failure

 

[hubbahubba]

Turned out it was low hydraulic presure. We have adjusted pressure up to 30 bar. Now any ideas what this light is for? It comes on and wont go forward till u go in reverse then forward again. Neither of the 2 forward buttons will work wonce its on.

 

[Planttech]

Turned out it was low hydraulic presure. We have adjusted pressure up to 3 bar. Now any ideas what this light is for? It comes on and wont go forward till u go in reverse then forward again. Neither of the 2 forward buttons will work wonce its on.

3 bar? The circuit should operate at between 25/30 bar. Not seen that symbol before, possibly have a button sticking or wiring fault??

 

[Planttech]

Turned out it was low hydraulic presure. We have adjusted pressure up to 3 bar. Now any ideas what this light is for? It comes on and wont go forward till u go in reverse then forward again. Neither of the 2 forward buttons will work wonce its on.

@asm

 

[hubbahubba]

3 bar? The circuit should operate at between 25/30 bar. Not seen that symbol before, possibly have a button sticking or wiring fault??

Sorry miss typed yeh 30 bar and as soon as we adjusted the pressure up the handbrake worked fine. Just dont know why it droped to 20 bar...?

That light came on once before the presure was adjusted. As soon as u go in reverse then it will go forward, second time of asking.

 

[asm]

@asm

Try just using the buttons on the side of the dash and not on the joystick.
I would say you have a joystick button sticking,

 

[hubbahubba]

Try just using the buttons on the side of the dash and not on the joystick.
I would say you have a joystick button sticking,

When the warning symbol comes on i attached above neither of the 2 forward buttons work but both reverse buttons. It doesnt do it often but pretty frustrating.

 

[asm]

I would think the button is sticking we have replaced quite a few now