Merlo Parking Brake

[Extreme Optimist]

Why do they put these stupid electric parking brakes on? Cables much easier!!

Have been having issues with the parking brake not releasing when switched off for a while now. Light comes on on the dash and doesnt go out. Have been able to rectify this by switching machine on and off. Now, this won't work and the parking brake won't release! Have now also lost any drive.

The switch is working and the fuse is OK. Have found the solenoid that is supposed to release the brake and that is getting red hot when you flick the switch, so it must be the right one. Have tried swapping the solenoid valve with another one to rule out faulty valve and that won't work either.

I am presuming that the hydostatic drive is supposed to disconnect when the parking brake is applied - although ours has never worked like that.

Anyone got any ideas/solutions as it's got me beat??

 

[Farma Parma]

Why do they put these stupid electric parking brakes on? Cables much easier!!

Have been having issues with the parking brake not releasing when switched off for a while now. Light comes on on the dash and doesnt go out. Have been able to rectify this by switching machine on and off. Now, this won't work and the parking brake won't release! Have now also lost any drive.

The switch is working and the fuse is OK. Have found the solenoid that is supposed to release the brake and that is getting red hot when you flick the switch, so it must be the right one. Have tried swapping the solenoid valve with another one to rule out faulty valve and that won't work either.

I am presuming that the hydostatic drive is supposed to disconnect when the parking brake is applied - although ours has never worked like that.

Anyone got any ideas/solutions as it's got me beat??

Only advice is speak to your dealer.
14.5yrs old merlo here from new, not one single issue with its brilliant electric/hydraulic handbrake.
Now it will fail next time i use it

 

[Planttech]

Why do they put these stupid electric parking brakes on? Cables much easier!!

Have been having issues with the parking brake not releasing when switched off for a while now. Light comes on on the dash and doesnt go out. Have been able to rectify this by switching machine on and off. Now, this won't work and the parking brake won't release! Have now also lost any drive.

The switch is working and the fuse is OK. Have found the solenoid that is supposed to release the brake and that is getting red hot when you flick the switch, so it must be the right one. Have tried swapping the solenoid valve with another one to rule out faulty valve and that won't work either.

I am presuming that the hydostatic drive is supposed to disconnect when the parking brake is applied - although ours has never worked like that.

Anyone got any ideas/solutions as it's got me beat??

If you have lost drive I wouldn’t mind betting you need a new drive couple between engine and pump. As for handbrake I would suspect a couple of new contacts on the back of the switch will sort this unless you have a failed coil.

 

[Planttech]

Why do they put these stupid electric parking brakes on? Cables much easier!!

Have been having issues with the parking brake not releasing when switched off for a while now. Light comes on on the dash and doesnt go out. Have been able to rectify this by switching machine on and off. Now, this won't work and the parking brake won't release! Have now also lost any drive.

The switch is working and the fuse is OK. Have found the solenoid that is supposed to release the brake and that is getting red hot when you flick the switch, so it must be the right one. Have tried swapping the solenoid valve with another one to rule out faulty valve and that won't work either.

I am presuming that the hydostatic drive is supposed to disconnect when the parking brake is applied - although ours has never worked like that.

Anyone got any ideas/solutions as it's got me beat??

Also the handbrake should hold the machine in second gear. First gear will have enough torque to override the handbrake, BUT if used like that will cause damaged. What model do you have?

 

[Extreme Optimist]

Also the handbrake should hold the machine in second gear. First gear will have enough torque to override the handbrake, BUT if used like that will cause damaged. What model do you have?

Thanks for that. Have a 40.7 It just seems weird that it was driving fine, I stopped it and had the parking brake issue and then simultaneously lost the drive (this having previously been fine.)
You think the loss of drive and the parking brake are completely independent of each other? It just seems a hell of a coincidence.

 

[Planttech]

Thanks for that. Have a 40.7 It just seems weird that it was driving fine, I stopped it and had the parking brake issue and then simultaneously lost the drive (this having previously been fine.)
You think the loss of drive and the parking brake are completely independent of each other? It just seems a hell of a coincidence.

The handbrake is fed off of the transmissions pilot/charge system so both linked. Put a test gauge on the test port that’s on the transmission filter housing you should have 25-30 bar.

 

[Extreme Optimist]

The handbrake is fed off of the transmissions pilot/charge system so both linked. Put a test gauge on the test port that’s on the transmission filter housing you should have 25-30 bar.

Thanks will have a look at that.

 

[Farma Parma]

might be wide of the mark but a M8 bolt failed on the mine about 5 years ago that holds the gear on the shaft in the selector box under the boom
machine freewheeled to a stop. a 50p bolt cost £700 to repair. unreal

 

[asm]

If the light on the dash does not go out it could be a faulty pressure switch on the block with the solenoid valve in it

 

[Suckndiesel]

The handbrake is fed off of the transmissions pilot/charge system so both linked. Put a test gauge on the test port that’s on the transmission filter housing you should have 25-30 bar.

That happened my 32.6 about 4 months ago, lost all drive and then the handbrake locked on!

 

[Chuckie]

That happened my 32.6 about 4 months ago, lost all drive and then the handbrake locked on!

How many hours did that last?

 

[Suckndiesel]

A bit over 7000. The same thing happened on a 1994 27.7 we had, from memory it happened around similar hours.

 

[jd6820]

That happened my 32.6 about 4 months ago, lost all drive and then the handbrake locked on!

This chaps got the answer I reckon? Drive coupler has probably given up and sheared the splines. The brake pressure is fed of the charge system for the transmission.

 

[Extreme Optimist]

If the light on the dash does not go out it could be a faulty pressure switch on the block with the solenoid valve in it

You are correct. The light does not go out. It doesn't matter which position the switch is in, the light remains on.

 

[Planttech]

Why do they put these stupid electric parking brakes on? Cables much easier!!

Have been having issues with the parking brake not releasing when switched off for a while now. Light comes on on the dash and doesnt go out. Have been able to rectify this by switching machine on and off. Now, this won't work and the parking brake won't release! Have now also lost any drive.

The switch is working and the fuse is OK. Have found the solenoid that is supposed to release the brake and that is getting red hot when you flick the switch, so it must be the right one. Have tried swapping the solenoid valve with another one to rule out faulty valve and that won't work either.

I am presuming that the hydostatic drive is supposed to disconnect when the parking brake is applied - although ours has never worked like that.

Anyone got any ideas/solutions as it's got me beat??

Hi have you got to the bottom of this yet?

 

[Extreme Optimist]

Waiting for my engineer to come out to it again. I have passed all the comments on to him and he's looking in to it. He's sure it's not the drive coupling though. Suggested flywheel sensor maybe?
It's like losing your right leg being without the telehandler!!!

 

[Planttech]

Waiting for my engineer to come out to it again. I have passed all the comments on to him and he's looking in to it. He's sure it's not the drive coupling though. Suggested flywheel sensor maybe?
It's like losing your right leg being without the telehandler!!!

With engine running flywheel sensor will give error code on transmission ecu. Flashing red light

 

[Fletch Mills]

I have drive problems also on a Multifarmer 30.9 have to rev lots to move then it just stops, both gears forward and reverse,
Any ideas be very appreciated as not getting help from the local dealer

 

[asm]

@Fletch Mills when the drive stops are there any error codes on the transmission controller ?
The controller is usual behind a panel in the back of the cab

 

[Fletch Mills]

Ok thanks I’ll have a look tommorow
Last time drive stopped completely it was the drive card that box you talking about and they cant repair them cost almost $5000 for new one hope it’s not that again