iDRY Vacuum Kilns

Sponsors:

540b hydraulic issue

Started by thumper, December 27, 2015, 01:35:03 PM

Previous topic - Next topic

0 Members and 1 Guest are viewing this topic.

thumper

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

beenthere

Are you sure that the brakes are not the problem?
south central Wisconsin
It may be that my sole purpose in life is simply to serve as a warning to others

thumper

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

grassfed

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

thumper

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

grassfed

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

grassfed

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

thumper

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

dnash

Quote from: thumper 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.

Isn't the transmission supposed to be in the 185psi range?
JD 440C
JD 640D
Timberjack 205HR
JD 329E skidsteer
JD CT322 skidsteer

thumper

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.
Quote from: dnash on December 28, 2015, 06:26:59 PM
Quote from: thumper 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.

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

cutter88

I was always told 185 high idle pressure
Romans 10 vs 9 
650G lgp Deere , 640D deere, 644B deere loader, 247B cat, 4290 spit fire , home made fire wood processor, 2008 dodge diesel  and a bunch of huskys and jonsereds (IN MEMORY OF BARRY ROGERSON)

thumper

Quote from: cutter88 on December 28, 2015, 08:50:42 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

Tmg80

 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?  

mike_belben

Check for sump screen or strainer plugging up.  
Praise The Lord

Southside

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.  
Franklin buncher and skidder
JD Processor
Woodmizer LT Super 70 and LT35 sawmill, KD250 kiln, BMS 250 sharpener and setter
Riehl Edger
Woodmaster 725 and 4000 planner and moulder
Enough cows to ensure there is no spare time.
White Oak Meadows

Tmg80

So to check the sump screen and strainer where do I look? And on the priority valve where would I look?  

Southside

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
JD Processor
Woodmizer LT Super 70 and LT35 sawmill, KD250 kiln, BMS 250 sharpener and setter
Riehl Edger
Woodmaster 725 and 4000 planner and moulder
Enough cows to ensure there is no spare time.
White Oak Meadows

Tmg80

Would u happen to have a picture of it?

Tmg80

Mike where is the strainer screen at ur talkn about?

teakwood

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. 
National Stihl Timbersports Champion Costa Rica 2018

mike_belben

Quote from: Tmg80 on September 25, 2021, 09:53:07 PM
Mike where is the strainer screen at ur talkn about?
i have never even drove a skidder.  just giving generalized troubleshooting advice.  a machine that plugs up in time is often a case of debris which settles in a hydraulic sump, then is slowly drawn up and blocked by a sump screen, which cuts flow and causes a pump to start cavitating and whining, worsening as you go because more and more debris is filling the strainer holes and lowering the flow into the gears which go under vacuum and start to squeel. 


if youve got a sump screen, cross that possible fault off the list by checking.  if you dont then its likely a low pressure condition cause by a short circuit bank to tank without doing work, downstream of the pump.  this is basically an internal leak condition, not a dripping on the ground scenario.  fluid bypassing its job because of some alternative route back to tank.  priority valve internal issue would fit that description but i dont know your specific machine in any way.  just general hydraulic principles.
Praise The Lord

newoodguy78

I'm not sure on your skidder but on John Deere tractors of that vintage they are under where your feet are when sitting at the very bottom of the rearend housing and go in horizontal, plug is removed with a 1/2 ratchet I believe. I'm sure someone more knowledgeable will be along.

Tmg80

What kind of hydraulic fluid goes n a JD 540 skidder??

newoodguy78


beenthere

south central Wisconsin
It may be that my sole purpose in life is simply to serve as a warning to others

Thank You Sponsors!