Cat 924 G not enough traction

[GerryBR]

Hello!
My wheel loader lost traction, when it needs power. Before wheels were spinning on any ground, now in full accelaration, wheels do not spin anymore... What can be wrong before openning the transmition? Oil level is ok. Thanks for professional advice!

Gerry

 

[GerryBR]

???

 

[John C.]

You are providing a pretty limited description of what is happening. A serial number might help. Is the transmission overheating? What is the condition of the tires? How old and how many hours are on the machine. Have there been any repairs done to the machine recently? Are there any fault codes indicated on the monitor panel? What is the machine being used for, load and carry, loading pit run, charging a processing plant or loading trucks?

 

[DARO]

One more question.. is it blowing black smoke? Or any smoke? That gen cat has a fuel filter that dosent take much junk to plug it up.. mostly though need more info to give thoughts..

 

[ol'stonebreaker]

When I was in the trade a loader hand spinning tires would get his azz bit and if he kept it up he was down the road kickin' a horse apple.
Mike

 

[GerryBR]

hello John and Daro,
thanks for answers. Machine Id. is AAN00536. Transmission´s temperature is ok. Torque coverter oil level I checked and it is also ok, when machine is running, the oil stays between the range. Converters oil filter I also changed, but not with Caterpillar´s brand, just put a lower quality oil filter, I don´t know, if it matters anyhow? About hours I can´t say, it shows 3500 hours, but that is not real, machine has more hours. The machine I use on our farm, it does all kind of works. I noticed low traction at full accelaration, when I tried to push a tree over... I would like to know, if there is any ajustment at the torque converter´s oil pump to provide more power to the transmission with less accellaration? The engine is ok, no smoke at all.

Thanks for your replies!
Gerry

 

[Delmer]

Do you have a tachometer, and is the engine running as full speed when it the machine stops moving? or does the engine slow down?

 

[GerryBR]

hello Delmer,
the engine keeps full rpm, no slow down.

 

[John C.]

Have you checked the fuel system on the engine to make sure it is getting all the fuel it needs. No smoke can also mean not enough fuel is getting to the engine.

 

[Delmer]

hello Delmer,
the engine keeps full rpm, no slow down.

Thanks, I'm guessing John didn't see your response.

One more thing before we say the torque converter and/or transmission is slipping. Does the machine slow down more than it used to when loading something more normal, like sand or gravel? When pushing a tree, especially if you have the bucket high for leverage on the stump, the angle will put more weight on the wheels to it won't spin the tires like it would pushing at ground level.

You're probably looking at a bad torque converter or transmission, but I don't know what to tell you about those, and just wanted to get the other possibilities out of the way. As far as I know, there are no adjustments that will fix this, but there are pressure tests that should be done before taking it apart.

 

[GerryBR]

Hello,

another doubt came to my mind. Does the Caterpillar 924G, year 2000, has an intelligent power distribribution control, so that the power is directed where it is momentaneously more needed, like the boom, steering, transmission? I ask, because the hydraulic oil hose from the steering was not tight enough and the main oil reservoir behind the cabine is under level. Could that be interfering the torque converter?

Thanks for helps!
Gerry

 

[Bruno97]

olá, tenho um carregador 924G que está tirando meu sono. máquina fria, tenho pressão de bomba de 300 psi em marcha lenta. pressão p1 - p2 - p3 abaixo do especificado. após 20 minutos de trabalho, a pressão da bomba cai para 80 psi. máquina perde toda a potência na transmissão. abrimos e trocamos todos os selos e consertamos a bomba. Não sei mais o que olhar. alguma dica?

 

[Bruno97]

hello, I have a 924G loader that is taking my sleep. cold machine I have 300psi pump pressure at idle. p1 - p2 - p3 pressure below specified. after 20 minutes work, pump pressure drops to 80psi. machine loses all power in transmission. we open and change all seals and repair the pump. I don't know what else to look at. any tips?

 

[Nige]

Attached is the System Operation document for the power train of your 924G.
Have you checked the operation of the flow control valve #1 and the differential pressure relief valve #3.?

Se adjunta el documento de operación del sistema para el tren de potencia de su 924G. ¿Ha revisado el funcionamiento de la válvula de control de flujo #1 y la válvula de alivio de presión diferencial #3?

 

[Nige]

Here is the location of the Flow Control Valve.
Aquí está la ubicación de la válvula de control de flujo.

 

[Nige]

And here is the location of the differential pressure relief valve.
Y aquí está la ubicación de la válvula de alivio de presión diferencial.

 

[Bruno97]

hello nige, how are you? I disassembled the valve group to see if I saw anything strange. I have no experience. apparently no scratches or damaged parts. From the posted image, is the flow valve located on the transmission housing?

 

[Nige]

From the posted image, is the flow valve located on the transmission housing?

Yes it is. The transmission control valve has to be removed to gain access to it.

 

[Bruno97]

ok i will remove and update you on that

 

[Nige]

Before you do, what oil are you using in it.? If you are using SAE30 TO-4 then put some 50 in it. Does it change the symptoms.?