Warning Light - how to diagnose?

[John Roy]

Hi,
I have a JCB 3CX 2002 model, I use it for moving logs into my portable timber mill and doing dirt road repairs. I’m also new to heavy machinery. Had machine 6 months.

I was hoping one of the knowledgeable folk on this great forum could offer some advise on how to diagnose the following issue.

A warning light has been on for a while.
I believe it’s the transmission. I’ve posted a photo.
It’s on when I first start the machine and remains on. I have a manual but not for this machines year and it doesn’t have the same icon. So I’m not 100% sure what it’s telling me.

I thought it could be the sensor(read they go from time to time) as machine has been functioning fine. But, the other day there was hesitation in forward gear, like transmission slip in an automatic car but was fine going in reverse. I stopped work then next day everything was fine when I started the machine and moved it a short way but I didn’t work the machine so I don’t know if it’s a problem that is temperature related.

I would like advise on how to proceed. The best process. What to check first, second, etc.

Thank you in advance for assistance.

J

 

[marco]

I'd change the sensor, on the older 3cxs they are dirt cheap. Might be no harm do the oil and filter as well

 

[wasted years]

If the transmission temperature warning light is on from cold , it can't actually be hot so I would start as advised with the sensor and change the oil /filter.

 

[John Roy]

Thanks for the reply’s. I was hoping it was the sensor but the hesitation when hot was a concern. It was not moving forward but was in reverse.
I’ll change the sensor and the filters, oil etc.
I was hoping someone could advise me what might cause the lack of power going forward when hot.
Thanks again.

 

[wasted years]

Hesitation when hot could just be lack of oil.

 

[John Roy]

Thanks for that. I’ve checked oil after warming for 10 minutes but will try again after I’ve worked it solid for a while.

 

[John Roy]

Hi
I've attached a photo of a sensor below is this the one I'm looking for? I live away from where the machine is garaged so I've not tried to remove it yet and would like to purchase now. From previous research I believe it is situated on top of the transmission indicated by letter N in diagram from manual. Is this correct?
Also when draining the transmission oil the manual says to clean the strainer with a solvent but doesn't say what type of solvent. Can someone please advise what I should use.
Thanks for your help.
John

 

[John Roy]

Is the sensor also called the "oil pressure switch"?
The diagram above is from a later model than my 2002.
I've got the correct model workshop manual now.

 

[Koush13]

Hello
I've got a jcb 3cx eco year 2016.
Master warning light comes and goes out.
The machine is working fine.
Can anyone help me

 

[Stock]

handbrake?.................................................................

 

[Koush13]

Handbrake down..
Infact the warning keeps popping... on and off

 

[Fraserb]

Ours can do that if theres water in the fuel filter, what are you doing with the machine when it comes on

 

[Koush13]

Stop the machine.

But sometimes it goes out by its own...
Like if there is a loose connection somewhere.

 

[Fraserb]

Stop the machine.

But sometimes it goes out by its own...
Like if there is a loose connection somewhere.

Sorry what I was meaning was what job are you doing when the light comes on, is it always when working hard or when using certain functions.

 

[Koush13]

It comes anytime...
Even on light job.

 

[Fraserb]

I'd check the water seperator on the fuel filter

 

[Teddy99]

Also when draining the transmission oil the manual says to clean the strainer with a solvent but doesn't say what type of solvent. Can someone please advise what I should use.

Use petrol or kerosene or diesel to clean the mesh strainer .

Is the sensor also called the "oil pressure switch"?

Yes it's also called an oil pressure switch.

 

[Esmund Kwok]

Dear All,
My Boss just bought in 1 unit of JCB 540-170 Telehandler. It pop out an warning light. Can I know what does it mean? And what should I do?

TIA