Bobcat 453 hydrostatic case pressure

Help Support SkidSteer Forum:

Lachlant54

Member
Joined
Aug 20, 2022
Messages
9
Hi guys.
I'm having a few issues with the hydrostatic pumps in my bobcat 453. The case on each pump seems to be pressuring and blowing out the top pintle cover seals. I had pulled both pumps down and found the wear plates and piston shoes to be a bit scored. So I polished everything on some 1200 grit and 2000 grit wet and dry and everything came up perfectly. But it hasn't resolved the issue. Just wondering if I should have knocked the edges off each piston port at the bottom of the rotating groups?
Also have noticed the case doesn't have a case drain directly back to the tank, they drain internally to the hydraulic gear pump. Would adding a case drain on each pump back to the reservoir help or is that a dumb idea.
Thanks guys
 
OP
OP
L

Lachlant54

Member
Joined
Aug 20, 2022
Messages
9
Fluid diagram
 

Attachments

  • 0F12812A-F915-46F9-9AF8-EAADC199B81B.jpeg
    0F12812A-F915-46F9-9AF8-EAADC199B81B.jpeg
    147.7 KB · Views: 62
  • E2579CBB-E378-414F-8B78-0D88748D3E6D.jpeg
    E2579CBB-E378-414F-8B78-0D88748D3E6D.jpeg
    135.7 KB · Views: 67
  • F3BCAFA1-E9C1-4BF1-B117-CECF6CB46740.jpeg
    F3BCAFA1-E9C1-4BF1-B117-CECF6CB46740.jpeg
    184.1 KB · Views: 56

Latest posts

Top