Boomer 4060 hydraulic screen.

[Tracy Welch]

Where is the hydraulic screen located on the Boomer 4060 EHSS. I always thought I serviced my
tractor extremely well but yesterday it just quit moving in any direction and the loader and 3 point lift became extremely jerky as if it had air in the system. Upon further inspection I discovered the hydraulic pump was cracked around the base. The service manager at my local NH dealer said it was more than likely cause by the hydraulic screen being stopped up which caused to much pressure building up and that’s what cause the pump to crack. So changing the hydraulic oil and filter regularly did not prevent this costly repair. Any help is greatly appreciated.

 

[rScotty]

Where is the hydraulic screen located on the Boomer 4060 EHSS. I always thought I serviced my
tractor extremely well but yesterday it just quit moving in any direction and the loader and 3 point lift became extremely jerky as if it had air in the system. Upon further inspection I discovered the hydraulic pump was cracked around the base. The service manager at my local NH dealer said it was more than likely cause by the hydraulic screen being stopped up which caused to much pressure building up and that’s what cause the pump to crack. So changing the hydraulic oil and filter regularly did not prevent this costly repair. Any help is greatly appreciated.

Uh.... we need some more information. Something isn't making sense. I don't have a Boomer, but do have experience with tractor hydraulics.

It is true that some compact tractors do have an owner-serviceable wire screen filter that is accessed under a flange fitting in the hydraulic sump. I don't know if yours does or not, but the owner's manual will certainly say.
However, clogged or not, that screen sees very little pressure and cannot generate any. The way the system works is that hydraulic fluid is drawn from the hydraulic sump/tank through a screen in the bottom and then it goes to your spin-on replaceable hydraulic filter....and onwards to the intake port of the hydraulic pump. All of this feed from the tank to the pump is called the "suction side" - and the fluid is moving up to the hydraulic pump only under the influence of atmospheric pressure. i.e. less than 15 psi. It may leak, but it won't break anything.

Once in the pump, it is made to flow at high rate and pressure. A blockage after the pump could certainly break the pump, but that is why filtration is never - well...I shouldn't say never, but very rarely.... in the pressure side of the system. Not on compact tractors, anyway. If it was, then yes, a blockage could theoretically break the pump. But there safeguards against that. There are several "pressure relief valves" in the system to prevent damage if something should somehow block the flow. They are very reliable.

Bottom line is I don't know what the problem is, but I doubt that it is caused by a screen in the manner you were told.
good luck,
rScotty

 

[Tracy Welch]

I’m no hydraulic guru by any means but when the service manager said the “suction screen being stopped up caused too much pressure and cracked the pump it did not make sense to me either. But that’s his job so I’m not one to argue. I just know I don’t want anymore $1400 pump disasters. I just want to make sure that screen is clean and free of obstruction to rule that out. But I have no clue where that screen is located.

 

[Harry in Ky]

Power Steering Pump & Hydraulic Pump - Ehss | New Holland Agriculture | MyCNH US Store

Find schematics, manuals, specifications and diagrams for POWER STEERING PUMP & HYDRAULIC PUMP - EHSS. Find genuine OEM parts for your needs.

www.mycnhistore.com

New CNH website is not the easiest to negotiate but I THINK this may apply to your tractor. It does show a suction screen. That said, I'd need to think for a long time to think up a reason why the suction screen would cause a pump section to split.

 

[Tracy Welch]

Power Steering Pump & Hydraulic Pump - Ehss | New Holland Agriculture | MyCNH US Store

Find schematics, manuals, specifications and diagrams for POWER STEERING PUMP & HYDRAULIC PUMP - EHSS. Find genuine OEM parts for your needs.

www.mycnhistore.com

New CNH website is not the easiest to negotiate but I THINK this may apply to your tractor. It does show a suction screen. That said, I'd need to think for a long time to think up a reason why the suction screen would cause a pump section to split.

Looking at the hydraulic schematics it shows another filter/screen that appears in-line on the pressure side of the pump. I’m thinking that must be what the service manager meant when he was talking about the screen being stopped up and causing too much pressure.

 

[rScotty]

Looking at the hydraulic schematics it shows another filter/screen that appears in-line on the pressure side of the pump. I’m thinking that must be what the service manager meant when he was talking about the screen being stopped up and causing too much pressure.

Thanks for the schematic. Lets see.... Item 36 looks like a user-cleanable screen we talked about, and #31 is the spin on replaceble filter. Both are in-line and in the suction side. Real typical design.

Are you talking about item #6? I saw that, but assume it is a misprint. For a filter/screen to be in that high pressure line it would have to be protected by a relief valve and none is shown. So either the description of #6 is wrong in calling it a "filter strainer", or there is a relief valve and parallel flow path that is not shown.

Nobody would place a screen that could potentially block the only flow path in a system with that much pressure. It would never pass a design review - simply too dangerous.

rScotty