John Deere 440C skidder Rattling noise at hydraulic pump

[Cedar169]

I had my hydraulic pump rebuilt in a John Deere 440C line skidder using John Deere parts a few years ago.  Everything was working well, no leaks etc.  I never used it this winter and when I went to start it recently, a rattling noise was coming from near the hydraulic pump when idling.  If I raise and lower the blade, turn side to side the noise subsides.  Oil level is at optimum level.   Anyone else experience this. 

[LeftFinger]

Sounds like air

[arojay]

You might check all of the components of the pump drive.  When the clamps are not tight or the rubber bushings are worn you can hear a rattling sound.