LD1
Epic Contributor
Maybe. Did he replace the gland seal? I don't know?
Sorry I didn't put a ? At the end, but you never answered my question at the end of post 57. What do you think his issue was?
Hydraulic Cylinder Leak Down on Box Blade???
- Thread starter Piston
- Start date
- Views: 28356
Maybe. Did he replace the gland seal? I don't know?
Sorry I didn't put a ? At the end, but you never answered my question at the end of post 57. What do you think his issue was?
npalen
Elite Member
Something to keep in mind is that a faulty piston seal will create a pressure intensification on the rod side of the cylinder if the weight is trying to retract the cylinder. This higher pressure may cause oil to bypass a valve spool that wouldn't leak much under normal circumstances. Not saying that was the case here, just something to keep in mind.
Last edited:
LD1
Epic Contributor
Sometimes they come in a cylinder rebuild kit.
wdchyd
Elite Member
Maybe I missed something in this thread but I recall Piston said his box blade was leaking down........in his pics of the unit it shows his cyl is a pull cyl, so that to me would mean his cylinder rod is drifting out when the box blade is "leaking down" (his words)......He never said the cylinder was drifting in (IIRC)
The same setup as most bucket/tilt cylinders on FEL. If the piston seal or a check ball was not pressure tight on the piston head it would drift out like Piston said......so Yes his problem was directly the check/valve ball if it was off the seat......maybe that curl was a piece of a spring that got mashed between the hyd rod and the cyl base
The same setup as most bucket/tilt cylinders on FEL. If the piston seal or a check ball was not pressure tight on the piston head it would drift out like Piston said......so Yes his problem was directly the check/valve ball if it was off the seat......maybe that curl was a piece of a spring that got mashed between the hyd rod and the cyl base
Last edited:
LD1
Epic Contributor
I thought the same thing too when i watched the video. But post 9 and 10 clear it up better and I think Piston did say somewhere that the cylinder does indeed retract when the rippers drift down.
There is a linkage in there that makes the cylinder retract when the rippers drift down. The cylinder extends to raise the rippers. SO this would be just like loader arms drifting down.
There is a linkage in there that makes the cylinder retract when the rippers drift down. The cylinder extends to raise the rippers. SO this would be just like loader arms drifting down.
wdchyd
Elite Member
Yep, missed that pix......I was thinking it was the top cyl lifting the whole box blade
OP
Piston
Elite Member
Wd,
I did say what you wrote, but I made a mistake. When the scarifier bar would bleed down, the actual cylinder was retracting, so bleeding "in".
On this box blade, in order to raise the scarifier bar, you fully extend the cylinder. And in order to lower the scarifiers for ripping the ground, the cylinder is fully retracted.
I wasn't going to post anymore because this thread seemed to take a turn, but it seemed you were genuine in your reply. Thank you.
npalen
Elite Member
Hydraulic Cylinder Myth - Exploded!
This is some good info on what happens when the piston seal leaks. I realize that a leaking piston seal was not the culprit in this thread but thought some might be interested nonetheless.
This is some good info on what happens when the piston seal leaks. I realize that a leaking piston seal was not the culprit in this thread but thought some might be interested nonetheless.
