JD 2955 hydraulic problems

[NHbalerman]

Workung on a JD 2955 the loader works good but the tilt cylinder raises but it will go down slowly with a load on it. Have packed the cylinders repaired the couplings with new seal kit. Swapped some hoses around ztill does it. I have never worked on the control valve on the right side under cab. Is it like the 40 series and has 4 valves pressure and returm. Is there anything in there i need to know about if you think this is where my problem is? Thanks
.

 

[Jim.ME]

Workung on a JD 2955 the loader works good but the tilt cylinder raises but it will go down slowly with a load on it. Have packed the cylinders repaired the couplings with new seal kit. Swapped some hoses around ztill does it. I have never worked on the control valve on the right side under cab. Is it like the 40 series and has 4 valves pressure and returm. Is there anything in there i need to know about if you think this is where my problem is? Thanks
.

Did you swap both boom lift hoses and the two bucket hoses at the valve, so the bucket was on the boom spool and boom on the bucket spool? Did the boom drop when you used the bucket spool to lift the boom?

If the boom drifted down and the bucket stayed put when the hoses were swapped, it could be the bucket spool isn't centering. That could be binding linkage/sticking cable or weak/broken centering spring on that spool. There could be other issues but the make and model of the loader to figure out what valve you are working with may be needed.

If the boom stayed put on the bucket spool and the bucket still dropped on the boom spool, that points to a bucket cylinder problem.

 

[NHbalerman]

The loader is a 260 jd

 

[Jim.ME]

The loader is a 260 jd

Ok.

"Swapped some hoses around". What exactly did you do?

 

[NHbalerman]

Well they said they did but im going to check that part tomorrow im talking about swapping back at the remotes changing from one lever to the other

 

[Jim.ME]

Well they said they did but im going to check that part tomorrow im talking about swapping back at the remotes changing from one lever to the other

I took it this loader has a dedicated control valve under the floor. Is that correct or do you have to use the SCVs to operate the boom and bucket? The bucket and boom hoses need to swap locations on the valve that controls them. If a SVC remote is being used to supply a stand alone loader valve, changing to another SVC remote will not diagnose a problem such as this one that is controlled by the loader valve. The SCVs are just supplying oil to the loader valve,

Stiff working cables and linkages can hold a spool slightly out of center and cause drifting. Make sure all are free and move easily.

 

[Tx Jim]

Does loader have independent joystick or scv for a control valve. If scv then yes scv has 4 poppet valves similar to rowcrop scv.

 

[NHbalerman]

It is plugged into the rear remotes not a joystick and the valve is on the right side under the cab and lt looks like the spool type

 

[Jim.ME]

It is plugged into the rear remotes not a joystick and the valve is on the right side under the cab and lt looks like the spool type

So, it uses two pair of rear remotes, one pair for the boom lift and one pair for the bucket control, correct. If so, after swapping the two functions from one pair of remote couplers to the other pair, if the problem stayed with the bucket, it is a bucket cylinder issue. If it went to the lift function it would indicate a valve issue.

 

[Tx Jim]

It is plugged into the rear remotes not a joystick and the valve is on the right side under the cab and lt looks like the spool type

JD offered either poppet style or spool type scv control valves on a 2955. https://partscatalog.deere.com/jdrc/sidebyside/equipment/2650/referrer/navigation/pgId/2885539

https://partscatalog.deere.com/jdrc/sidebyside/equipment/2650/referrer/navigation/pgId/3032596

 

[buickanddeere]

So, it uses two pair of rear remotes, one pair for the boom lift and one pair for the bucket control, correct. If so, after swapping the two functions from one pair of remote couplers to the other pair, if the problem stayed with the bucket, it is a bucket cylinder issue. If it went to the lift function it would indicate a valve issue.

Unless the SCV valves have the optional return line to a ported filter cover instead of the transmission case . The loader will be slow and noisy as the front pump cavitates . Feel free to find the person who installed the loader and kick them in the tender parts for being cheap and stupid .
Deere figured out by the end of the 20 series . That returning hydraulic oil from high flow loads to the transmission case . Starves the front pump .

 

[Jim.ME]

Unless the SCV valves have the optional return line to a ported filter cover instead of the transmission case . The loader will be slow and noisy as the front pump cavitates . Feel free to find the person who installed the loader and kick them in the tender parts for being cheap and stupid .
Deere figured out by the end of the 20 series . That returning hydraulic oil from high flow loads to the transmission case . Starves the front pump .

If supply and return plumbing is the cause of the tilt cylinder slowly going down with a load on it, why don't the lift cylinders go down as well?

 

[NHbalerman]

JD offered either poppet style or spool type scv control valves on a 2955. https://partscatalog.deere.com/jdrc/sidebyside/equipment/2650/referrer/navigation/pgId/2885539

https://partscatalog.deere.com/jdrc/sidebyside/equipment/2650/referrer/navigation/pgId/3032596

Yeah that is what it has. I havent been back over there yet to swap those hoses yet but i do think cylinder but i packed em but maybe the barrel is bad because the seals went in just fine may just have to replace them

 

[Fixingfarmer]

well there's a couple ways to test a few things. Go find a different implement to hook to the back. Assuming that works next unhook both cylinders from the pins on the bucket and test them without a load see if one acts goofy if somethings jamming in the cylinder you would think one only would do it. They should both smoothly extend. One side might go first but smooth all the way in all the way out is the key. If both act goofy really slow. take the line off at the rod end of each cylinder and remove the SCV coupler at the other end of the hose and blow compressed air through (into a bucket) see if somethings stuck. There might be a manual lock safety valve but I think that's in the lift side. Last put a new male scv coupler on that end you took off assuming everything else flows good.

Theres an adjustment valve under the seat of some 55 series that won't let hydraulics work right I think its return not entirely sure how it works since ive never had to take one apart and done even really know what its for but if the 3 point on the 2555 doesn't work I turn that knob. I don't know that its ever caused an issue with the hydraulics but its always raise the 3 point then go play around here so that is step 1.

 

[Fixingfarmer]

well there's a couple ways to test a few things. Go find a different implement to hook to the back. Assuming that works next unhook both cylinders from the pins on the bucket and test them without a load see if one acts goofy if somethings jamming in the cylinder you would think one only would do it. They should both smoothly extend. One side might go first but smooth all the way in all the way out is the key. If both act goofy really slow. take the line off at the rod end of each cylinder and remove the SCV coupler at the other end of the hose and blow compressed air through (into a bucket) see if somethings stuck. There might be a manual lock safety valve but I think that's in the lift side. Last put a new male scv coupler on that end you took off assuming everything else flows good.

Theres an adjustment valve under the seat of some 55 series that won't let hydraulics work right I think its return not entirely sure how it works since ive never had to take one apart and done even really know what its for but if the 3 point on the 2555 doesn't work I turn that knob. I don't know that its ever caused an issue with the hydraulics but its always raise the 3 point then go play around here so that is step 1.

CONSISTANTLY SLOW and smooth should not be a cylinder problem in return with a load, pressure, and not in float position. Not holding or leaking down would be seal and/or piston barrel problem. or seeing a bunch of metal.

 

[Tx Jim]

IMHO simplest hydraulic test is installing a ISO male hyd tip on a 5000 psi gauge then plug fitting in each breakaway coupler, operate control lever & view/record pressures on the gauge

 

[Jim.ME]

I agree with Tx Jim on the pressure test being simple, and quick. Always a good first step to check hydraulics.

For NHbalerman's issue. Swapping the two pair of loader hoses on the remotes and seeing if the issue stays with the bucket or moves to the boom will point to a cylinder or valve issue. No need to find something else to hook onto for this loader issue that I can see.

 

[EX Deere Farmer]

If you have a valve on the right hand side that a cable controlled joystick operates, that is were you need to switch the hoses. Where it is fed at the rear SVC is just a supply and return. If that supply was the issue both bucket and lift cylinders would be effected the same