2840 Hydraulic system

[Anonymous-0]

I have a 2840 having hydraulic problems there is a noise like vibration in the hydraulic lines seems to have excessive pressure has recently blowed a couple of lines and expanded the filter. All this started after clutch went out had clutch replaced shortly after that seal on front hydraulic pump started leaking replaced front pump and worked fine for another short period now has blown out two lines and has vibration in lines changed filter and noticed filter looked like it had been blown out by extreme pressure. Any information would help lots just dont wont to tear anything else up!

 

[Tx Jim]

R&R of traction clutch should have no effect on hyd system. First thing I'd suggest is checking hyd pressures of trans and main pumps. 2840's were plagued with hyd problems when new. Some started very hard after a few 100 hrs use from excessive hyd load on starter motor.

When I worked for a JD dealer I remember one 2840 that I sold new that the pto clutch came apart and ruined the trans case.

 

[yallardeere]

Jim If they got lines crossed on lower pressure, could that have caused part of his problems..one could have check valve in it.. just asking, trans pump would have no place to return after going to front pump..trans pump bypass could have failed and swelled filter...just throwing this out...

 

[Tx Jim]

(quoted from post at 09:40:35 11/17/11) Jim If they got lines crossed on lower pressure, could that have caused part of his problems.

I not going to state it would be impossible to switch lines but after viewing parts schematics I think it would be very unlikely.
AL28075 OIL LINE 1 FRONT PRESSURE
AL25015 OIL LINE

On your point about possible stuck hyd filter relief valve that's why I suggested to check trans hyd psi.

 

[LJD]

Sounds like somebody lost a check valve when they split the tractor for the clutch job? Check the Deere manual. As I recall, there's a check-valve assembly that will fall out of one of the steel lines when you split the tractor. I've seen them drop into pails and get lost.

I'm going by memory which isn't always perfect, so check the book.

 

[pjbrown]

I have an 2840 that will blow out an internal o ring by the transmission. Then it will start dripping oil out the bellhousing when it's shut off. It will last about an year or two. I have a 2030 and 2755 and have never had this problem. I have had the 2840 spilt in two 3 times since i had it just to replace a simple little o ring. Last time i had the hi/low clutches rebuilt and the pto clutches replaced when they replaced the oring.

 

[Anonymous-0]

Well have had this tractor for 10 plus years knock on wood havnt had many problems and I didn't know if when it was split for the clutch if that could have affected anything it was probably 100 hours after clutch front pump started leaking replaced pump myself worked great for prolly another 100 hours noticed the noise from hydraulic lines first then it busted a metal line on right side of tractor didn't think much about it due to age of tractor replaced line then another line busted that's when I noticed the filter so just replaced that line and have not even started the tractor its just been sitting cuz I don't even know where to begin checking stuff. Other than the noise and lines breaking everything works fine.

 

[Tx Jim]

(quoted from post at 12:54:58 11/17/11) I don't even know where to begin checking stuff. /quote]

As I previously stated: first thing I'd do is check trans pump pressure(should be 165-175 psi) and check stand-by pressure(should be 2250 psi). I did not see a check valve that could fall out from a split when I looked at the parts schematic. Both hyd lines I listed the part #s were JIC flare fittings not the clamp in type similar to other JD utility tractors with the check valve.

 

[buickanddeere]

Could be dirt in the system.Or a chunk of shop rag that had been jammed into a line to stop dripping.

 

[yallardeere]

the 2 I work are clamp type and both had check valves

 

[Tx Jim]

(quoted from post at 16:50:33 11/17/11) Could be dirt in the system.Or a chunk of shop rag that had been jammed into a line to stop dripping.

I doubt it's a shop rag causing the problem as the lines aren't very large diameter. This part # is a JIC fitting that joins 2 lines together.

Part Number: R27266
Description: CONNECTOR,UNION
Specification
Weight 0.37 LBS 0.17 Kg
Tube Outside Diameter 0.750 IN
Thread Size 1.062 IN
Length 2.161 IN
Length 0.00 IN
Length 0.862 IN
Finish B

 

[yallardeere]

did they reinstall the line retainers....

 

[Tx Jim]

(quoted from post at 17:19:33 11/17/11) the 2 I work are clamp type and both had check valves

yallerdeere
I viewed the parts schematic again and I hate to admit it but you're correct as I looked at the schematic incorrectly. Here's the number of the check valve.
T23203 VALVE SEAT 1

SORRY!!!!!!!!!!!!!

 

[yallardeere]

That's OK Jim We are still alive...lol The person that don't make a mistake has dirt covering him..lol

 

[BigCountry]

Are there ports specifically for pressure checking or do you have to hook into a line somwhere? Are there kits available with fittings and pressure gauge?

 

[buickanddeere]

Tx Jim. I'll forgive you even if the rest of them
won't.

 

[Tx Jim]

(quoted from post at 07:52:47 11/18/11) Tx Jim. I'll forgive you even if the rest of them
won't.

Thanks Glen.
I forgive you when you make mistakes also. But one of the differences between you & me is I'll admit to my mistakes and you won't admit yours. I welcome for someone to correct my mistakes and you dislike it when some catches your mistake. :roll:

 

[yallardeere]

what?????????????? Man you need to get your facts right...................

 

[yallardeere]

sorry Jim My name is Glenn also

 

[Tx Jim]

(quoted from post at 18:04:16 11/18/11) sorry Jim My name is Glenn also

No problem I was replying to a quote of buickanddeere aka Glen with one"N"