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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JD410 TLB Hydraulic question- please help!

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Dave Newman

02-17-2005 15:29:48




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I HAVE A NICE RUNNING jd410 TRACTOR lOADER BACKHOE, APPROX 1972, HAS HYDRAULIC REVERSER

THE FRONT BUCKET WILL NOT WORK CONSISTENTLY. SOMETIMES IT DOES AND SOMETIMES IT DOESN'T

THE BACKHOE ALWAYS WORKS, EVEN WHEN THE LOADER DOES NOT, WE HAVE CHANGED THE FILTERS ON THE TRANS/HAYDRAULIC AND WE HAVE THE SYSTEM FULL OF OIL

SOMETIMES IT SEEMS WHEN YOU HAVE IT IN A CERTAIN RANGE/GEAR IT WILL WORK, BUT NOT ALL THE TIME

PLEASE HELP

THANKS
DAVE

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Jonathan In MA

02-17-2005 17:31:56




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 Re: JD410 TLB Hydraulic question- please help! in reply to Dave Newman, 02-17-2005 15:29:48  
The loader valve on that machine gets its oil after it passes thru the "pressure control valve" which is another term for a priority valve. Its located on the right side of the transmission case. Its purpose is to give the steering system the priority over the loader operation for obvious safety issues . The backhoe is supplied oil thru this valve , but it is not affected by steering operation , as you would have to be one hell of an operator to run the backhoe and need steering at the same time. If the pump pressure drops below I believe 1400 psi or there about, then a valve spool shifts in this pressure control valve , and gives preferance to the steering, either slowing the loader down or stopping it completely. If the pessure is above that , then both the loader and steering work. If you have a pump pressure problem , then what you explained will happen. should probably get a pressure guage and install it into the test port on the front pump. Top port on the right side of the "stroke control valve" (front cover) of the hydraulic pump. At an idle, the stand-by pressure should be about 2300 psi. Numerous possibilities of where the problem might be. Maybe get a pressure reading , and then plan an attack.

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Roy Suomi

02-18-2005 22:20:25




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 Re: JD410 TLB Hydraulic question- please help! in reply to Jonathan In MA, 02-17-2005 17:31:56  
Inside that pressure control valve that Jonathan stated earlier, there is a valve spool . Inside that valve spool is an oriface with shim washers behind it. In order to remove that spool for inspection, you need to drain the oil, remove hoses and steel line from valve assembly, remove valve housing, remove pin from back side, push spool out. You might have to drive out that oriface because of flattened out shims. Clean up oriface where it slides inside of bore , get new shims [ same amount as before ].Reassemble using new o-rings [ I get mine from Deere, it's tough to find the larger poly ring anywhere else].Torque the bolts evenly to 35 ft. lbs. Hook up the lines and try it. Should work OK....

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Dave Newman

02-17-2005 17:48:38




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 Re: JD410 TLB Hydraulic question- please help! in reply to Jonathan In MA, 02-17-2005 17:31:56  
Thanks for the info

we will check that tomorrow

Dave
www.easternsurplus.net



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