Komatsu WA470-5H hydraulic oil in transmission

[kemark]

Hello,

I have a komatsu WA470-5H machine. I have a problem with hydraulic oil that gets into the transmission. After starting the machine, oil comes in in a few minutes. Please help. what to check first?

 

[grf_1000]

More than likely you have a pump seal is blown out. Very common with Komatsu loaders.

 

[John C.]

I don't know the vintage of your machine but Komatsu used plenty of aluminum bodied gear pumps on wheel loaders and the bodies were only good for a maximum of 5,000 hours before they swelled and put oil out the drive shafts into the tranny.

 

[kemark]

Thank you for the information. There is actually a gear pump with an aluminum housing. He will dismantle the pumps and check. I will let you know what I found.

 

[syed adii]

we are facing same issue hydraulic oil mix in transmission oil. we change 2 pumps but after couple of hours pump seal again . during this behavior one thing we notice the machine main hydraulic pump outlet pipe oring leak again and again then leak the pump seal.
we have komatsu wa-470

 

[jurick40]

we are facing same issue hydraulic oil mix in transmission oil. we change 2 pumps but after couple of hours pump seal again . during this behavior one thing we notice the machine main hydraulic pump outlet pipe oring leak again and again then leak the pump seal.
we have komatsu wa-470

Did you solve the problem sir?