John Deere 1640 Strange Hydraulic Problem

[Jimbo1640]

Mentioned this gauge at the beginning of this thread so thought I would post a pic. Did this a few years ago when we first encountered problems: a pressure gauge on the hydraulic pump. Tractor needs a spring cleanup but you get the idea. This was not expensive and really paid off later when began encountering a lot of other problems that made no rhyme or reason--at least you could tell what was going on at a glance.

 

[historyan1975]

Rockshaft control valve seals/gasket kit part # is AL57974 & piston seals are part # AL33105

Hi,
I search for this # AL57974, but I only found the lift cover gasket, like in photo - not the control valve seals...

 

[historyan1975]

If memory severs me, this is what our Hydraulic Relief Valve looked like after we pulled it. Notice the O ring on the left was shot and in pieces. Cheap fix with an assorted O ring kit, although I've found it is better in the long run to order the real thing from John Deere--they last longer and aren't very expensive. It may also be called the Filter Bypass Valve-- can't remember, did a lot of valves on this tractor.

TxJIm also adviced us to check the same thing...

 

[historyan1975]

Mentioned this gauge at the beginning of this thread so thought I would post a pic. Did this a few years ago when we first encountered problems: a pressure gauge on the hydraulic pump. Tractor needs a spring cleanup but you get the idea. This was not expensive and really paid off later when began encountering a lot of other problems that made no rhyme or reason--at least you could tell what was going on at a glance.

What is should be the proper oil pressure on the gauge?

 

[Tx Jim]

Tractordata states 2466 psi(170 bar) hyd stand-by pressure. All dark outlined parts including seals are included in part # AL57974

 

[Elite605]

Hello forum, I do not want to create a new post, I noticed in the photo Flow Control Valve disassembled and there are four washers. I have a john deere 2140 with a sg2 cabin how many washers should I have?

 

[Tx Jim]

Hello forum, I do not want to create a new post, I noticed in the photo Flow Control Valve disassembled and there are four washers. I have a john deere 2140 with a sg2 cabin how many washers should I have?

Welcome to TBN
# of washers required is determined by pressure desired for priority pressure for power steering. IRRC the factory setting pressure on flow control valve was 1700-1750 psi. I notice parts catalog # 4185 lists 7 washers fir this valve.

 

[Elite605]

Yes, it is correct, according to the parts catalog, there should be 7 of them. In my tractor when I bought there were 4 of them, if it changes something I have a front loader.

 

[Tx Jim]

Correctly adjusted flow control valve helps keep power steering valve from starving for hyd pressure/flow when operating hyd control valves such as 3pt,scv & FEL. Power steering valve starving for flow while operating a hyd control valve can cause steering wheel to briefly hesitate when turning wheel.

 

[Zebrafive]

PC4179 for European 2140 to serial number 429999 shows only 4 shims.

 

[Tx Jim]

IMHO testing pressure is the only accurate method to know correct # of shims required. Parts catalogs have been known to contain incorrect information.

 

[Zebrafive]

IMHO testing pressure is the only accurate method to know correct # of shims required. Parts catalogs have been known to contain incorrect information.

Agreed
For my 2030, TM states adjust to 1700-1800psi. I have never checked mine.

 

[Elite605]

Thanks guys for your help, I'm going to the field tomorrow and let you know what and how it works

 

[Tx Jim]

Agreed
For my 2030, TM states adjust to 1700-1800psi. I have never checked mine.

Technically if operating a hyd function other than steering doesn't affect the steering wheel operation then there's no real need to check pressure at flow control valve because flow control(priority) valve is operating as designed

 

[vasil jd]

hello, I'm looking for an opinion. jd 1640 has the same problem, but there are metal particles in the oil

 

[Tx Jim]

Welcome to TBN
What is the quantity of metal particles? Most common cause for metal filings in hyd oil is failed brake pads/linings. I suggest to remove rear axle housings for a visual inspection of brakes.

 

[DLTrekkers]

And check if the brakepedals pivot shaft is not rusted and can not return ! Aswell that the brakepedals is adjusted correctly.

 

[vasil jd]

Welcome to TBN
What is the quantity of metal particles? Most common cause for metal filings in hyd oil is failed brake pads/linings. I suggest to remove rear axle housings for a visual inspection of brakes.

The amount of particles is dense, I noticed it when I cleaned the filter.

 

[vasil jd]

And check if the brakepedals pivot shaft is not rusted and can not return ! Aswell that the brakepedals is adjusted correctly.

for a brake pedal to function, you have to push it immediately in a second, and maybe that's the reason.

 

[DLTrekkers]

That is one simtone of dirt under that side brake. Replace both valves in the brakemaster. But we are seaching for the cause of dirty filter.