• Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!

zx225usr-3 no swing problem

auy_tong2

Well-Known Member
Joined
Dec 1, 2010
Messages
86
Location
Hongkong
check control pressure on pump 2 is ok no pressure going to the swing motor, pilot pressure left and right is ok to signal control valve and to the control valve...left travel is working but slow
 

auy_tong2

Well-Known Member
Joined
Dec 1, 2010
Messages
86
Location
Hongkong
the pressure of pump 2 is only .7mpa... but when i tried blocking the swing motor supply the pressure is ok it reached relieft pressure...so its on the swing motor...my question is why its low pressure...opened the swing relief makeup valve...seems ok....also the check parking brake is ok... and valve plate and piston is ok...
 

auy_tong2

Well-Known Member
Joined
Dec 1, 2010
Messages
86
Location
Hongkong
also before first start of the excavator no swing...have to wait 1 to 2 minutes...moving arm bucket and boom before swing will work, right swing is ok..left swing littlr weak...now. it wont work waiting few minutes
 

auy_tong2

Well-Known Member
Joined
Dec 1, 2010
Messages
86
Location
Hongkong
also before first start needs to boom down jack up before swing will work.... is this in the control valve?? maybe a check valve...
 

LACHAU

Senior Member
Joined
Aug 11, 2009
Messages
976
Location
Saigon, Vietnam
I suggest you try to check the status of the SB port when performing swing on your machine.
You can check at 02 positions: at main pump regulator or at signal control valve


ScreenShot_20230322182401.png
ScreenShot_20230322185325.png
ScreenShot_20230322185008.png
 
Last edited:

auy_tong2

Well-Known Member
Joined
Dec 1, 2010
Messages
86
Location
Hongkong
I suggest you try to check the status of the SB port when performing swing on your machine.
You can check at 02 positions: at main pump regulator or at signal control valve


View attachment 282252
View attachment 282254
View attachment 282255
I suggest you try to check the status of the SB port when performing swing on your machine.
You can check at 02 positions: at main pump regulator or at signal control valve


View attachment 282252
View attachment 282254
View attachment 282255
4mpa checking on the monitor... same with left travel that is control pressure..but i will still review tomorroe the sb pressure on the regulator with a gauge...thanks.
 
Last edited:

auy_tong2

Well-Known Member
Joined
Dec 1, 2010
Messages
86
Location
Hongkong
im suspecting again the swing relief valves... this relief is different design from other excavators... it has few orings inside.. and there is orifice in the middle that will pressurize the back of the relief...
 

auy_tong2

Well-Known Member
Joined
Dec 1, 2010
Messages
86
Location
Hongkong
connected gauge today....control pressure is ok
 

Attachments

  • IMG20230323085406.jpg
    IMG20230323085406.jpg
    3.9 MB · Views: 6
  • IMG20230323085321.jpg
    IMG20230323085321.jpg
    3.4 MB · Views: 6
Top