John Deere 310 A hydraulics quit!

[Johnpaul]

Everything was working great... was backing up after dumping the front loader bucket, and the tractor stopped as if I pushed in the clutch. All the hydraulics stopped working, no deterioration of any kind just.....nuthin...hmmmm

 

[DT86]

I am willing to bet you have sheared the coupling that drives the pump. It runs off the front of the crank shaft.

 

[pjbci]

Its either that or problems with the charge pump inside the front transmission case since it works the forward neutral and reverse system plus supplys oil to the main front pump. Im thinking the tractor should drive itself without the front pump since the fnr system works from the low pressure charge pump. Please let us know what you find out. I have a 310a that i use everyday loading gravel and would like to know the reason if mine ever does this.

 

[Tx Jim]

I agree on checking frt hyd pump coupler. Also could have stripped the hub out of the engine disconnect clutch.

 

[Johnpaul]

So, if it might be the low pressure charge pump, what would it have done to suddenly stop working? The tractor does not move. How could I check the charge pump, and is it the block mounted bottom right side of tranny where the forward/reverse linkage comes in?

 

[Johnpaul]

So, if it might be the low pressure charge pump, what would it have done to suddenly stop working? The tractor does not move. How could I check the charge pump, and is it the block mounted bottom right side of tranny where the forward/reverse linkage comes in?

 

[Johnpaul]

Where is the engine disconnect clutch?

 

[DT86]

Where is the engine disconnect clutch?

If I am thinking straight....it is in the pump. There should be a single electric connector on the top of the pump.

 

[pjbci]

I think tx jim may be on the momey. The hub on the engine clutch may have sheared off the rivets causing the transmission input shaft to quit turning. Thus stopping the charge pump. I had a IH 986 do this once.

 

[DT86]

I was thinking he meant the pump/engine disconnect.

 

[Tx Jim]

Where is the engine disconnect clutch?

Engine disconnect clutch is located right behind the flywheel. The frt hyd pump has nothing to do with tractor moving/not moving. It is possible one of the gears in the trans pump(charge) broke(2nd photo). Block on RH side is the reverser control valve(3rd photo). Does tractor have a pto?

 

[J_J]

Did you mean that all hyd quit, including the implement pump for the loader and 3pt?

Maybe you mean the hyd drive train.

Does your engine still run?

 

[Johnpaul]

I was thinking he meant the pump/engine disconnect.

Well, I put new filters on and cleaned the pickup screen, which did not appear very plugged at all.. No change in the issue...no hydraulics or forward/reverse what so ever. Hard to know if the input shaft to the hydraulic pump is actually ok or not. The fact that no forward/reverse is still the question that the pump is even the question. How do I check the low pressure supply from the tranny area?

 

[Johnpaul]

To determine a broken gear requires the tractor to be split in 2 and exposed. Not sure that would be in the budget or the under taking. Any other tests of determining whether the low pressure supply is reaching the hydraulic pump?

 

[DT86]

To determine a broken gear requires the tractor to be split in 2 and exposed. Not sure that would be in the budget or the under taking. Any other tests of determining whether the low pressure supply is reaching the hydraulic pump?

You can put a gauge on the low pressure supply to the big pump. I had to do that on my 2355 once. I don't know what the pressure should be however.

 

[Tx Jim]

Trans pump pressure should be 165 psi. Pressure can be checked on shift valve that's located on RH side in my 3rd photo from previous post.To check condition of drive clutch I suppose one could remove the clutch housing cover,VERY CAREFULLY bump engine over and see if input shaft is moving.

DOES your tractor happen to have a PTO??

I have limited experience diagnosing JD industrial tractor failures but a lot of experience on JD agriculture tractors which however have a few differences

 

[medic0648]

The 301 and 310 are based on the jd 1020 ag tractor and share most of the test procedures and psi ranges.

 

[Johnpaul]

No pto , it has a permanent backhoe

 

[medic0648]

I have a 301a and lost all hydraulics when the loader valve failed internally. Might be worth checking the return to make sure it isn't flowing with no controls engaged. The tractor has a closed center main system that can suck all available fluid from the oc charge pump.

 

[Gale Hawkins]

I have a 301a and lost all hydraulics when the loader valve failed internally. Might be worth checking the return to make sure it isn't flowing with no controls engaged. The tractor has a closed center main system that can suck all available fluid from the oc charge pump.

Since FEL use was last action before failure your experience could apply in this case too.