Skidsteer attachment with 3 hydraulic couplers

[oil barron]

I’ve bought a whacker plate for a skidsteer and it has 3 hydraulic hoses. The normal two for a skidsteer attachment and a third smaller female one. The normal two are the supply and return for the hydraulic motor and the third looks like a case drain? It has a sticker saying to fill with hydraulic oil there. Should I just plug it into a spool then fill?

 

[Nearly]

@Mr Happy
@TripleSix

 

[e3120]

I wouldn't be putting any pressure on the case drain. It normally wants a minimal back pressure free return.

 

[oil barron]

I wouldn't be putting any pressure on the case drain. It normally wants a minimal back pressure free return.

Yeah, I’m coming to the conclusion it is just a case drain. Next question, I’m not plumbed for a case drain - is it ok to tie it in to the hydraulic return line with a check valve so that you can’t pressure it up by mistake or does it need a complete separate line back to the tank?

 

[e3120]

Yeah, I’m coming to the conclusion it is just a case drain. Next question, I’m not plumbed for a case drain - is it ok to tie it in to the hydraulic return line with a check valve so that you can’t pressure it up by mistake or does it need a complete separate line back to the tank?

By the book would be a separate line, but I have done what you suggest in the past with no ill effects. The motor wasn't in constant use (bedder spout rotation) unlike yours. Do whatever @Mr Happy says!

 

[goldeneagle]

Find a return line to the tank and tee in there, some motors are very sensitive and will blow seals at the slightest back pressure, plus if you buy a flail etc all the plumbing is there.

Would also consider putting an inline filter in the hose run incase the motor does grenade some day.

Ikron HF705 - HTL Website - HTL (Formerly BYPY)

Supplier of hydraulic and transmission components for over 40 years UK distributor for Walvoil Casappa Eaton Miselli

www.htluk.co.uk

 

[oil barron]

Find a return line to the tank and tee in there, some motors are very sensitive and will blow seals at the slightest back pressure, plus if you buy a flail etc all the plumbing is there.

Would also consider putting an inline filter in the hose run incase the motor does grenade some day.

Ikron HF705 - HTL Website - HTL (Formerly BYPY)

Supplier of hydraulic and transmission components for over 40 years UK distributor for Walvoil Casappa Eaton Miselli

www.htluk.co.uk

Good idea. Thanks.

 

[oil barron]

Do you need to fill the case drain side of the motor with oil before using or is it ok to be dry until you get some seepage past the seal?

 

[Blue.]

Shouldn’t need a filter because the tank has an intake filter.

After constant trouble with supposedly pressure free returns on tractors I find direct into the tank the best way.

 

[oil barron]

Shouldn’t need a filter because the tank has an intake filter.

After constant trouble with supposedly pressure free returns on tractors I find direct into the tank the best way.

It’s not actually going on a skidsteer, it’s going on a tractor loader, so I’m thinking the filter would be a good idea.

 

[Blue.]

It’s not actually going on a skidsteer, it’s going on a tractor loader, so I’m thinking the filter would be a good idea.

A tractor will still have a filter ,so wasted really.

 

[goldeneagle]

A tractor will still have a filter ,so wasted really.

A case drain should be straight back to tank not through a spool return to avoid back pressure, normal practice is to pipe straight into lift cover plate or modify filler cap.

If you can prevent contamination by stopping it going in why not? Hydraulic motors are known to fail some gradual others catastrophic so preventing hydraulic system contamination is not wasted given a transmission flush and subsequent series of filter changes could be into thousands.

 

[Blue.]

A case drain should be straight back to tank not through a spool return to avoid back pressure, normal practice is to pipe straight into lift cover plate or modify filler cap.

If you can prevent contamination by stopping it going in why not? Hydraulic motors are known to fail some gradual others catastrophic so preventing hydraulic system contamination is not wasted given a transmission flush and subsequent series of filter changes could be into thousands.

because the filter will cause restriction in the line.

 

[goldeneagle]

because the filter will cause restriction in the line.

Restriction is not the issue for this purpose. A case drain shouldn't see flow as such that the filter restriction would cause issue unless there is a defect with the motor, but yes there is always going to be a Dp with any filter.

 

[Blue.]

I've had a huge amount of hydraulic motors on machines over the years,had lots fail but never contaminated the oil they usually blow the shaft seal or just stop.

 

[goldeneagle]

I've had a huge amount of hydraulic motors on machines over the years,had lots fail but never contaminated the oil they usually blow the shaft seal or just stop.

I came across these filters on the arb forums when i was considering putting a case drain onto the excavator and thought they were a good idea. These guys are working flails, saws etc which may have a harder life and suffer catastrophic failure. In essence they are an economic version of an excavator breaker line return filter which for longevity of the breaker needs to see very little back pressure among other things.