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Author Topic: 540b hydraulic issue  (Read 4536 times)

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Offline thumper

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540b hydraulic issue
« on: December 27, 2015, 01:35:03 PM »
guys ive been running this 540b for about 4 mos with no problems other than the blade speed was slower than my 440a. now it sounds like the hydraulics are labored. like its low on fluids but it isnt. when i start off it is barely noticeable but by the 3rd trip it has slowed everything..  i have changed all the fluid with hygard and new filters again, checked the high and low pressures on the pump and they both test great.  i have noticed the brake pedal doesnt have much change once the engine starts.. any ideas guys???
Jonsered 2150 2152 2156 2165  Husqvarna 262xps Worn 1970 JD440a 06 GMC 3500 DURAMAX

Offline beenthere

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Re: 540b hydraulic issue
« Reply #1 on: December 27, 2015, 01:50:14 PM »
Are you sure that the brakes are not the problem?
south central Wisconsin
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Offline thumper

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Re: 540b hydraulic issue
« Reply #2 on: December 27, 2015, 01:55:32 PM »
no, not sure. the brakes still stop the machine.  i just cant remember if the pedal got easier to push once it starts (before issue). and the brake valve isnt getting warm..
Jonsered 2150 2152 2156 2165  Husqvarna 262xps Worn 1970 JD440a 06 GMC 3500 DURAMAX

Offline grassfed

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Re: 540b hydraulic issue
« Reply #3 on: December 27, 2015, 04:57:49 PM »
When you changed the filters did you clean the transmission pump intake strainer screen? Could the transmission pump be going out ? I don't know much about 540B s, they have much more complicated hydraulics but on the 440B the trans pump sends oil to the main hydraulic pump.

Or maybe a relief valve is failing?   
Mike

Offline thumper

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Re: 540b hydraulic issue
« Reply #4 on: December 27, 2015, 07:52:14 PM »
yes, intake screen is spotless. i checked the transmission charge pump and it has 70lbs idling and 100lbs hi idle.. well on hi side of deere specs.
Jonsered 2150 2152 2156 2165  Husqvarna 262xps Worn 1970 JD440a 06 GMC 3500 DURAMAX

Offline grassfed

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Re: 540b hydraulic issue
« Reply #5 on: December 28, 2015, 09:45:59 AM »
Hmmm if the pressure is on the high side of specs check the fluid temp after it has been running hard and you are experiencing the symptoms. Maybe the pump is adjusted wrong and it is overheating the fluid...just a thought but it would explain your symptoms. 
Mike

Offline grassfed

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Re: 540b hydraulic issue
« Reply #6 on: December 28, 2015, 09:49:36 AM »
If it is running hot here is a link that talks about a pump being out of adjustment and causing heat.  http://crossfluidpower.com/blog/3-common-causes-hydraulic-overheating
Mike

Offline thumper

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Re: 540b hydraulic issue
« Reply #7 on: December 28, 2015, 06:19:26 PM »
the pump and cooler will warm up, im guessing to maybe 100 degrees (8-30 degrees out) and the oil on the dipstick is cold or very cool. brake and diff valve cold. im thinknig a bypass valve or relief valve?  i have learned alot about this machine and still alot i dont know! haha
Jonsered 2150 2152 2156 2165  Husqvarna 262xps Worn 1970 JD440a 06 GMC 3500 DURAMAX

Offline dnash

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Re: 540b hydraulic issue
« Reply #8 on: December 28, 2015, 06:26:59 PM »
yes, intake screen is spotless. i checked the transmission charge pump and it has 70lbs idling and 100lbs hi idle.. well on hi side of deere specs.

Isn't the transmission supposed to be in the 185psi range?
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Offline thumper

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Re: 540b hydraulic issue
« Reply #9 on: December 28, 2015, 07:12:27 PM »
perhaps the trans is 185.. but the jd book here says pump inlet pressure 5-25 low idle and 80-115 hi idle  and 2300-2400 on hi side.
yes, intake screen is spotless. i checked the transmission charge pump and it has 70lbs idling and 100lbs hi idle.. well on hi side of deere specs.

Isn't the transmission supposed to be in the 185psi range?
Jonsered 2150 2152 2156 2165  Husqvarna 262xps Worn 1970 JD440a 06 GMC 3500 DURAMAX

Offline cutter88

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Re: 540b hydraulic issue
« Reply #10 on: December 28, 2015, 08:50:42 PM »
I was always told 185 high idle pressure
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Offline thumper

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Re: 540b hydraulic issue
« Reply #11 on: January 02, 2016, 01:13:54 PM »
I was always told 185 high idle pressure
Transmission pressure and pump inlet pressure are two different things and two different specs.
Jonsered 2150 2152 2156 2165  Husqvarna 262xps Worn 1970 JD440a 06 GMC 3500 DURAMAX

Offline Tmg80

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Re: 540b hydraulic issue
« Reply #12 on: September 21, 2021, 08:24:57 PM »
 I hav a John Deere 540B that I recently bought. Seems to run fine at first but seems lik when the hydraulics warm up the blade and grappler all slow down. And the steering gets hard to turn. And ideals?  

Online mike_belben

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Re: 540b hydraulic issue
« Reply #13 on: September 21, 2021, 09:09:17 PM »
Check for sump screen or strainer plugging up.  
Isaiah 63:10

Offline Southside

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Re: 540b hydraulic issue
« Reply #14 on: September 21, 2021, 10:49:28 PM »
Priority valve is sticking is my guess.  Had the same issue on my 440, internal springs were all to spec but the body was worn and the gland would stick. Gutted it and the machine ran fine.  
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Offline Tmg80

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Re: 540b hydraulic issue
« Reply #15 on: September 21, 2021, 11:13:16 PM »
So to check the sump screen and strainer where do I look? And on the priority valve where would I look?  

Offline Southside

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Re: 540b hydraulic issue
« Reply #16 on: September 21, 2021, 11:58:18 PM »
The priority valve was pretty much right behind the steering wheel on mine.  Lines went to the brake, turn, and blade along with feed and case drain. 
Franklin buncher and skidder
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Woodmizer LT Super 70 and LT35 sawmill, KD250 kiln, BMS 250 sharpener and setter
Riehl Edger
Woodmaster 725 and 4000 planner and moulder
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Offline Tmg80

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Re: 540b hydraulic issue
« Reply #17 on: September 25, 2021, 09:51:40 PM »
Would u happen to have a picture of it?

Offline Tmg80

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Re: 540b hydraulic issue
« Reply #18 on: September 25, 2021, 09:53:07 PM »
Mike where is the strainer screen at ur talkn about?

Offline teakwood

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Re: 540b hydraulic issue
« Reply #19 on: September 26, 2021, 08:53:21 AM »
I have a 540A and there is a screen inside a tube (a flange with two 9/16 bolts) next to the right of the transmission hyd oil filter. you should get the books for your machine, they have helped me a tremendous amount. 
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