David Brown

[treequip]

And the the job lot comes off the rear end? I have been told to renovate the shims from a relief valve above the pump. do you know anything about this?

 

You can't renovate shims, they are what they are, if the relief valve is ok, leave it alone

[cornish wood burner]

Hi Simon Did you buy the log splitter you were enquiring about? As I said on that thread DB hydraulics were not that good a long time ago. PTO driven pump would be better if it is not too late.

 

To prepare you, most red DBs I came across had rubbish hydraulics ( possibly treequip used to send the wornout ones down to Cornwall) The other 20% had new pumps fitted which I expect is where you will end up. They are easy go work on but IMO even with a new pump you will be way behind where you could be.

[hedgesparrow]

Not yet, i have just serviced the engine and have drained the transmission fluid. think i mite have a look at a new pump because the 1700 its knocking out isn't enough for the little splitter. I haven't looked into it much but from what i can gather the pump is located under the pto? have you messed about with 1 of these before?

 

if it was me save your pennies drain the hydraulic oil out replace the filter. and then put your splitter on it when under load bet there will be near 2000psi running as its under load and bet splitter works fine if not then new pump or have yours serviced maybe a cheaper option. and if there good at there job be like new

[cornish wood burner]

if it was me save your pennies drain the hydraulic oil out replace the filter. and then put your splitter on it when under load bet there will be near 2000psi running as its under load and bet splitter works fine if not then new pump or have yours serviced maybe a cheaper option. and if there good at there job be like new

 

The problem with those DB pumps is the aluminium body and the phosphor bronze bushes wear. Seen loads all the same. Long time logo now but I think they used to go down to 1000psi.

[treequip]

if it was me save your pennies drain the hydraulic oil out replace the filter. and then put your splitter on it when under load bet there will be near 2000psi running as its under load and bet splitter works fine if not then new pump or have yours serviced maybe a cheaper option. and if there good at there job be like new

 

They don't have hydraulic oil, the 990 uses UTO in the back end, that's why the pumps are usually down on pressure

 

You cant mend a pump with new oil and hydraulic oil is thinner than UTO so it would be even lower on pressure particularly at operating temp.

[simonm]

After speaking to an old boy who actually worked on these in their hay day, he has advised me to remove a shim on the pressure relief valve as it mite be blowing off too soon. if this doesn't work then its new pump time. the new pump should be ample for the splitter i want to operate. :thumbup1:

[simonm]

And as treequip said after seeing how the system works on matter how good the filter is it still wouldn't change the pressure.

[cornish wood burner]

After speaking to an old boy who actually worked on these in their hay day, he has advised me to remove a shim on the pressure relief valve as it mite be blowing off too soon. if this doesn't work then its new pump time. the new pump should be ample for the splitter i want to operate. :thumbup1:

 

Hi Simon I would just like to point out that a new pump will only produce about 7 gpm. Are you sure that is enough? Before you spend money I would advise you to check the splitter speed empty if you havn't done so already to make sure you are happy with it. Its speed empty will not change dramatically with a new pump.

For your comparison

Small Massey's little bit less flow but higher pressure

IH 574 double your flow with a little more pressure

Electric splitter half the flow double the pressure

[simonm]

New hydraulic pump, serviced the whole tractor filters oil etc, removed a shim, adjusted the pressure relief valve and hey presto 2000 psi and that's not on really high revs. Just need a few more bits to attach it to the link arms

[treequip]

How much money did you drop at Marsdens????