The work control valve on my D37P-5 is leaking from the bottom of the case. I have attached a picture of where it is leaking from for reference. Looking at the schematic, which is also attached, it seems that once the snap ring and plate are removed, there is a plug (#25) there. Does that plug go bad or possibly loosen itself causing oil to leak down and past that plate? It's a pretty significant leak and will cause a decent loss of hydro oil during a full workday. Looking to see if anyone has some insight on if that plug could be the issue with the valve leaking or could be something else, like o-rings farther up on the case body. I want to get the parts ordered before we go and tear it all apart to fix it up, so I can keep downtime minimal. Any help would be appreciated!
https://en.av-gk.ru/catalog/komatsu/d37a-5r/420070/ I had a stab at your serial number and found the closest looking main valve , is the oil leaking from the part 27 off your part sheet , or is it leaking from between part 1 and 2 off the part list from my link ? There are so many places it could leak from , its a wonder it used to hold oil .
Its leaking past part number 28. We can see the oil pool up on the frame and subsequently drip onto the track. When you look and stick your finger up there, you can feel and see its leaking around that plate (#28) and dripping straight down. There is no oil on the case (#27) at all. Serial number is 3827
You need to remove spool and replace o rings in body
Every o-ring starting from the plate # 31 , rings listed as # 32 . There is a part listed as "spacer " , # 34 , if its copper it should be replaced as well . Looks a cheap enough job .