What is the white crystal-like or foam at the top of the fill tube?
Oil & Fuel GC1715 Blowing hydraulic fluid
- Thread starter Coyote1
- Start date
What is the white crystal-like or foam at the top of the fill tube?
hube2
Veteran Member
Those are air bubbles. When the fluid enters the return area pressure is released. This depressurization of the fluid can cause small air bubbles to form. Especially if the fluid is cold
DMW
Platinum Member
Wow, pictures explain your issue better than any description. An inspection camera down the fill tube might help out here. Something might have gotten dropped in during the fluid change. Don't be afraid of removing the tube for better access. I'm sure someone can provide insights.
hube2
Veteran Member
Just want to make sure that you didn't miss Oil & Fuel - GC1715 Blowing hydraulic fluid back on page 4. If it were me I'd definitely be getting and inspection camera like @DMW suggested above.
DMW
Platinum Member
I can understand your frustration. This is not a typical problem. As hube2 says, the issue seem to be a blockage not allowing the oil to drain back into the sump. The return line from the FEL drains back into the hydraulic lift cover. If it cannot drain, it will continue to fill until it starts coming out of the fill tube, which is actually a good thing as it stops any pressure build up that could blow out seals. The fill tube is only attached by a bolt on its side, and an o-ring in the base. If you remove it, it may allow the drain hole to be visible. Just going by the pictures, my GC2300 is very similar, but not identical.
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Robin Veerman
Platinum Member
Psst. Is it possible that the lever to the rear remotes has been switched on, and if no hydraulic implements are hooked up, the hydraulics are now dead-heading or flowing through a relief valve?
DMW
Platinum Member
Doesn't explain the pics posted by the OP with a visible level on the gauge for the oil sump, yet fluid coming out of the fill tube at a higher location.
