hydraulic valve problem?

[dig-dug-dan]

Nope, oil from only one part of the pump

[openspaceman]

Nope, oil from only one part of the pump

 

I must have inferred something wrong from what Breezeblock had found then.

 

I thought top high speed was with both pump outputs controlled by a pressure operated diverter valve.

[Breezeblock]

I must have inferred something wrong from what Breezeblock had found then.

 

I thought top high speed was with both pump outputs controlled by a pressure operated diverter valve.

 

it is according to the diagram but the pressure gets limited to 120bar the 2 speed part is controlled by a solenoid

did you get a gauge on it yet until you do its just guesswork

ps excuse my poor English I am **** at explains things

Edited January 10, 2017 by Breezeblock

[CallumA]

As breeze block says get a gauge on the pump both the 3 cc rev and the 8cc rev pumps remember you will have to have a service being used on the pump circuit otherwise you'll just measure the back pressure on the return to tank. Does any other service supplied by the small 3 cc pump work??

[dig-dug-dan]

mmmm. 3cc being a smaller pipe diameter from the pump i take it? if so, it just runs the conveyor

When i track it in high speed, the conveyor still runs ok.

Someone suggested the two speed solenoid is not returning to its proper position and could be allowing some oil to flow, but not enough.

i need to go an buy a tester . will try and do that tomorrow!

[cornish wood burner]

Assuming you have a dedicated relief valve in the tracking circuit it might be worth checking that is not jammed partially open by a piece of debris.

Just to be clear this will not be the main relief valve which I believe you have already checked.

You haven't mentioned checking it so I will explain the theory behind the suggestion.

The fault remained even when you put the original valve back so it is likely the fault is caused by something you have disturbed with the work. Likely either a wire / connection or a piece of debris such as a seal fragment.

The debris could have lodged somewhere, such as in a small pilot hole driving a shuttle or relief valve, possibly under the relief valve seat or preventing its movement in some way.

You said the tracks turn on slow speed when jacked up but not under load so the oil is getting there but not with any pressure. The larger flow would overcome the leakage through the open relief valve and generate sufficient pressure in the tracking circuit to run the tracks.

If this machine came into my workshop I too would check pressures and feed things direct but this is a suggestion to work with what you have.

Edited January 10, 2017 by cornish wood burner

[dig-dug-dan]

Just to be clear this will not be the main relief valve which I believe you have already checked.

You haven't mentioned checking it so I will explain the theory behind the suggestion.

The fault remained even when you put the original valve back so it is likely the fault is caused by something you have disturbed with the work. Likely either a wire / connection or a piece of debris such as a seal fragment.

The debris could have lodged somewhere, such as in a small pilot hole driving a shuttle or relief valve, possibly under the relief valve seat or preventing its movement in some way.

You said the tracks turn on slow speed when jacked up but not under load so the oil is getting there but not with any pressure. The larger flow would overcome the leakage through the open relief valve and generate sufficient pressure in the tracking circuit to run the tracks.

If this machine came into my workshop I too would check pressures and feed things direct but this is a suggestion to work with what you have.

 

I am starting to suspect some kind of debris lodged somewhere too I have removed three pressure relief valves now, and cleaned them with an airline, so starting to suspect the block where the oil comes into before the valves operate the tracks is the fault.

[Breezeblock]

I am starting to suspect some kind of debris lodged somewhere too I have removed three pressure relief valves now, and cleaned them with an airline, so starting to suspect the block where the oil comes into before the valves operate the tracks is the fault.

 

stop farting about and stick a guage on it until you do its a total guess

[dig-dug-dan]

stop farting about and stick a guage on it until you do its a total guess

 

Actually having trouble getting a gauge! might have to order one online.

[Breezeblock]

eBay no 310559663893

test hose and gauge