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.