John Deere 6610 hydraulic , steering problems

[Jd68]

Steering went heavy and hydraulics stopped working checked and cleaned intake screen ,filters and oil changed. Not sure if pump is working , can you check in situ.could it be a stuck valve?cheers

 

[NZ Tech]

Hi.. what pump does this have. Newer small rexroth or massive vickers pump?.

Premium or standard?.

 

[Jd68]

Hi
Think it’s the big pump. At least 5 pipes. Premium model
Thanks

 

[daveydiesel1]

Local contractors 6920s done that in out yard. Would only drive. Wouldnt tip trailers and steering was real heavy. It was something cracked in rear end but cant remember what it was. Apparently its a common enough fault. I could ask him if u want

 

[Jd68]

That would be great if could ask him daveydiesel1 many thanks

 

[daveydiesel1]

Ok was talkin to him there. He said its likely to be some of the following.
Spool block can crack resulting in loss of pressure.
Dirt stuck in pressure relief valve also resulting in no pressure
Or could be the pump has failed but would be worth checking them other things first

 

[NZ Tech]

Remove the big hose clamped on return hose and start the tractor. If lots of oil flows from the fitting its cracked the rockshaft valve. The valve with the finned aluminum stepper motor bolted too it.

aafter that if its the vickers pump the load control valve spools can seize in the controller and pump wont go into stroke..

 

[Gerbert]

My 6610 is beginning to be never ending story. It has had a spring break in the transmission valvecover on the bottom, jammed a piece between cover and valve. Needed all new parts so kind of an expensive exercise. When drainig the oil I had some pieces coming out looking like brakepad. Deciddd I'd do that later as I needed to do a job with the tractor.
Tractor back in one piece, and upon using the hydraulic valves it gurgled like mad in the backend. Figured the lining from the brakes blocked the mesh filter so I drained the oil again, had some brake liner (or what I could make of it)in the oil but nothing much in the mesh filter, so I went on to remove the trumpets. Right side nothing to see, left side I noticed a big play in the final drive, knackered (but intact) bearings. New bearings in, put it all back together, tried the hydraulics, still gurgling.
I am kind of frustated with the thing now obviously. It seems to have nothing to do with any of the repairs but it did begin after that.
Any ideas?

 

[NZ Tech]

Gurgling.. id remove the Hydraulic filter head dr and run the engine. Sounds air locked or remove the hose that goes from the pump to priority block on one end and see if you get any oil flow from it.

 

[Gerbert]

I noticed very bubbly oil in the filter. Emptied the filter and filled it with nice new oil. Put it on again, left the tractor running for a while and checked, again bubbly oil. Mechanic suggested there might be a problem where the oilpump draws the oil. He said there was a problem with it back when these tractors where quite new and there had been a mod. So I am opening up the rear end and having a look.

 

[NZ Tech]

There wasnt any updates back in the day. It picks up oil from the suction screen to the pump thru a gallery up the diff housing. To the charge pump.

A leaking charge pump gasket maybe?..

Basically that's it

 

[Gerbert]

Alright maybe I misunderstood. I didn't really get any clear answer to be honest.
Can the pumps be easily removed without tipping the cab or is tipping a must? I don't have the storage deep behind the seat so that helps.
I dropped the oil three times now and every time I was greeted by a bit of brakelining. Must be at least 5 years ago they where replaced.
Fun times.

 

[NZ Tech]

Well lucky for you, the engineers at jd actually thought about how the machines were going to be fixed at that point. You can unbolt the whole back of the cab that is below the window. It makes life easy.

Alright maybe I misunderstood. I didn't really get any clear answer to be honest.
Can the pumps be easily removed without tipping the cab or is tipping a must? I don't have the storage deep behind the seat so that helps.
I dropped the oil three times now and every time I was greeted by a bit of brakelining. Must be at least 5 years ago they where replaced.
Fun times.

 

[NZ Tech]

Well lucky for you, the engineers at jd actually thought about how the machines were going to be fixed at that point. You can unbolt the whole back of the cab that is below the window. It makes life easy.

Alright maybe I misunderstood. I didn't really get any clear answer to be honest.
Can the pumps be easily removed without tipping the cab or is tipping a must? I don't have the storage deep behind the seat so that helps.
I dropped the oil three times now and every time I was greeted by a bit of brakelining. Must be at least 5 years ago they where replaced.
Fun times.

 

[Gerbert]

Ah alright thanks. Never knew you could take part of the cab off.
It can't be that hard to figure out what's the problem looking at the hydraulic system. Only costly...

 

[NZ Tech]

Seems odd.

Charge pump picks up oil from the backend

 

[Gerbert]

Here's hoping for good new. There was a nothing to bad looking at the chargepump, some wearmarks but hey. Called in a JD mechanic to have a look and he said the wearmarks on the chargepump where nothing serious but the amount of crap (brakelining) around the suction screen may well account for bubbly oil in the filter and therefore the gurgling, just to little clean area left on the screen to draw oil. It does seem somewhat logical to me, upon emptying the backend all the crap landed near the suction screen. A sudden chargepump failure seems odd.
I did end up tipping the cab for better acces. To bad I forgot decoupling the clutch cable...

 

[daveydiesel1]

Here's hoping for good new. There was a nothing to bad looking at the chargepump, some wearmarks but hey. Called in a JD mechanic to have a look and he said the wearmarks on the chargepump where nothing serious but the amount of crap (brakelining) around the suction screen may well account for bubbly oil in the filter and therefore the gurgling, just to little clean area left on the screen to draw oil. It does seem somewhat logical to me, upon emptying the backend all the crap landed near the suction screen. A sudden chargepump failure seems odd.
I did end up tipping the cab for better acces. To bad I forgot decoupling the clutch cable...

Is it not time u replaced brakes with these bits of brake laying at the pump

 

[Gerbert]

My bad, forgot to include that in the story, the brakes where pretty much perfect. They where replaced some years ago so the lining that has now all of a sudden come to haunt me must've been stuck in some corner. Mechanic suggested I check the pto pack just in case and those plates where perfect.

 

[kill]

Neighbour had all his hydraulics just give out on him a couple of months ago ( JD 6400) mechanic thought a shaft had gone but turned out that the clutch pack linings blocked the filter completely because somehow water had got into the backend and contaminated his oil and it had also fudged the brake linings at the same time .