Aux hyd. On 247b won’t stay running

[Jerome Madson]

Cat 247b how to lock the aux hydraulic to stay running
Jerome Madson

 

[Nige]

How are you trying to engage the Aux Hydraulics now and what is the machine Serial Number.?

 

[Jerome Madson]

Rotate the switch and hit the top right button on left joystick

 

[Jerome Madson]

It’s a 2010 247b

 

[Nige]

It’s a 2010 247b

Sorry machinery doesn't work like vehicles with model years. We're going to need a Serial Number, MTL-something I would imagine.

The title says "Aux hyd. on 247b won't stay running". By that do you mean the Aux Hydraulics actually start up but then stop again when you release the thumbwheel roller/push button switch.?

Have you tested anything yet.?

 

[Jerome Madson]

Sorry machinery doesn't work like vehicles with model years. We're going to need a Serial Number, MTL-something I would imagine.

The title says "Aux hyd. on 247b won't stay running". By that do you mean the Aux Hydraulics actually start up but then stop again when you release the thumbwheel roller/push button switch.?

Have you tested anything yet.?

 

[Jerome Madson]

Yes it starts when I roll it forward and stops when I release it. Can’t get it to stay running

 

[Nige]

Yes it starts when I roll it forward and stops when I release it. Can’t get it to stay running

That's weird.

Do the aux hydraulics also stop if you release the button on the LH joystick while still holding the thumbwheel rolled forward or back.?

 

[Jerome Madson]

I’m not sure where to start checking

 

[Jerome Madson]

As long as I hold the roller it runs

 

[Nige]

As long as I hold the roller it runs

This is how I think it works. I'm not 100% sure, maybe someone else can confirm.
The roller signal tells the ECM to energize the auxiliary hydraulics. When pressed, the button on the LH joystick provides a "latching signal" to continuously engage the aux hydraulics.

I would suggest to find the 12-pin wiring harness connector underneath the LH joystick. Unplug it and use a multimeter to check the continuity between Pins 5 & 6, you should find it is open circuit. Press the front RH button and you should have continuity. Do the same test for the rear RH button between Pins 5 & 8. Post back with what you find.

 

[Jerome Madson]

Ok I won’t be home till next week and I’ll check this out thank you

 

[Nige]

Meantime I'm trying to confirm that is definitely how the system works. If I find anything different to the above I'll post it up.

 

[Brou7501]

i cant get my continuous flow switch to work either. Im just looking for some ideas does this have a fuse or relay that can go bad. I don’t have the operation manual and doesn’t tell me which each fuse is for. Any info would be great. Thanks advance

 

[Nige]

This is how I think it works. I'm not 100% sure, maybe someone else can confirm.

Confirming what I posted above. This is definitely how it works. The thumb roller turns on the system, the press-button on the LH joystick provides the latching signal.

i cant get my continuous flow switch to work either.

First need a Serial Number to identify the correct electrical schematic for your particular machine. I can send that to you once we've identified the correct one. I'll post up the fuse layout as well once we have a S/N.

Does your Continuous Flow not turn on at all, or it turns on but won't stay on.?

 

[Brou7501]

247b Mtl01923. The aux. Hydraulic run with the rocker switch but when i hit the continuous flow button ( on the left joystick, lower left button as far as my schematic shows) and release everything they wont stay running. I am the new owner of this machine and don’t know if they previously worked.

 

[Nige]

I’ll send you a schematic but the snip above will work. First thing you need to check is that the push-button switches marked C1 & C2 are working correctly.

 

[Brou7501]

am i just checking to see if there is power there. From the line digram it looks like those have nothing to do with the continuous flow switch?

 

[Nige]

All you’re checking for at this point is that the switch contacts close when pressed and open when released. So open the 12-pin connector and check for continuity between pins 5&6 and 5&8.

 

[Nige]

am i just checking to see if there is power there. From the line digram it looks like those have nothing to do with the continuous flow switch?

Effectively continuous flow depends on two signals. You have the first one from the roller switch, but it appears as though the "latching signal" from the LH joystick push button is missing. The LH joystick C1 push button sends a voltage to pull in the C1 continuous flow relay. The C2 button sends voltage to pull in the C2 relay.

I sent you an electrical schematic. Check your messages.