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I have a 2005 jcb mini cx backhoe, it keeps leaking

Customer Question
I have a 2005...

I have a 2005 jcb mini cx backhoe , it keeps leaking hydraulic fluid out of the vent on top of the reservoir , the vent cap on jcb seems to be a check valve of some sort, I installed a new one oem from jcb and installed new hyd. filter and filled with proper fluid to level in sight glass, all hydraulics work great, just keeps pushing fluid out vent, then gets on exhaust and makes a mess and smokes like a freight train, HELP

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Submitted: 11 months ago.Category: Medium and Heavy Trucks
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Answered in 4 minutes by:
8/1/2017
Technician: Daniel Wilson,
 replied 11 months ago
Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 6,835
Experience: Owner at DJ Wilson
Verified

Hi my name is***** will be glad to help. With the oil at operating temp does it go above the sight glass? I want to be sure it is not just slightly overfull and there is air space at the top of the tank. Also what position are all your attachments when checking the level?

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Technician: Daniel Wilson,
 replied 11 months ago

Please post the full model and serial number of your machine.

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Customer reply replied 11 months ago
the owners manual says travel position loader bucket off ground 12 inches and curled back, and hoe folded up , 2005 jcb mini cx backhoe slpmbh025e1042384
Customer reply replied 11 months ago
it is in the sight glass , i have tried below and above sight glass , messin with it a couple years
Technician: Daniel Wilson,
 replied 11 months ago

I thought actually it was hoe folded up and the loader bucket and cutting edge flat on the ground. If that is right then it could be the extra oil from the cylinder when lowering the bucket to the ground position coming out of the vent.

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Customer reply replied 11 months ago
I double checked owners manual and it states as I described
Customer reply replied 11 months ago
I have made sure the cooler is clean, fan belt is tight , fluid is clean and not foamy
Technician: Daniel Wilson,
 replied 11 months ago

The oil level always rises after operating temp so the middle of the glass is best. Are there any other operational issues with this machine?

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Technician: Daniel Wilson,
 replied 11 months ago

If there is not a problem with the level and air space top of tank then the only other thing I can think of if a problem with pressure bypassing somewhere to the return side of the system.

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Customer reply replied 11 months ago
the machine operates great, just messy, the vent cap from jcb you can not blow through it , there is a spring with a rubber diaphragm in it, and pricey, a typical vent cap on other hydraulic systems, I can blow through and they in expensive, closed system?
Customer reply replied 11 months ago
if I operate machine for a while what should fluid temp be
Technician: Daniel Wilson,
 replied 11 months ago

The hydraulic system takes a while to come up to operating temp is below 180f. Anything above that will break down the oil and will start to cause problems.

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Customer reply replied 11 months ago
I did not see where it says check it cold or hot
Technician: Daniel Wilson,
 replied 11 months ago

It does not. I am speaking from experience. I always go the middle of the glass cold if hot maybe 3/4 up

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Customer reply replied 11 months ago
it seems as though the fluid is returning back to the tank violently, is there some sort of defuser
Technician: Daniel Wilson,
 replied 11 months ago

That is what I suggested earlier.

"If there is not a problem with the level and air space top of tank then the only other thing I can think of if a problem with pressure bypassing somewhere to the return side of the system."

If this is the case it is an indication of a component problem allowing pressure to the return side. further testing of return and case drain pressures would be needed to isolate this.

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