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Hydraulic Motor

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Chris12325/05/2020 22:06:05
121 forum posts

Evening, we have a hydraulic motor (the motor turns on hydraulic flow, it isn´t an electric pump).

Where is the best place to ask advice on this, I´ve posted on a different forum but haven´t had any replies.

Basically, we have a hydraulic motor that has thrown off the rings that connect the pistons together, it has happened on both sides. Can these parts be replaced? We've been informed that we need a new motor, at the cost of several thousand pounds. But I'm struggling to believe that we can't make new rings for it.

not done it yet25/05/2020 22:56:51
4630 forum posts
16 photos

I would be using google to search out a company willing and able to effect repairs or advise. Your motor may well be thousands of pounds to replace - it rather depends on unknown factors. Ask the experts - is my advice - and get more than one quotation for a repair or relacement.

Michael Gilligan26/05/2020 00:16:29
15666 forum posts
682 photos

You may get more helpful responses, Chris, if you could give us a few more details of the motor.

The size, and a description of the basic design, would be handy ... and photos of the failure would help enormously.


HOWARDT26/05/2020 07:40:12
556 forum posts
15 photos

AC Hydraulics You may get an answer from this company. Used it for years during my working life, though it has changed during recent years. Pump, as well as most hydraulic components can be rebuilt but will depend on damage susbsequently caused by the failed component.

Chris Evans 626/05/2020 09:00:17
1652 forum posts

In my working life I used a few hydraulic motors for our applications. All where made by "Danfoss". Worth a Google to see if they are still around ?

Bo'sun26/05/2020 09:26:50
136 forum posts

Hi All,

Yes, concur Danfoss. Although they were based in Denmark, they had a UK office in West London. They were an excellent company to deal with. Not sure, but they may be tied-up with Sauermann (Sauer-Danfoss). There are also a number of hydraulic component "re-manufacturers" around, and that would be one of my first ports of call.

And, as has been said, some more detailed info' would also help.

David Jupp26/05/2020 09:33:16
728 forum posts
17 photos

It should be relatively easy to get assistance for 'common & current' hydraulic motors. For old or very specialised items it may be more hit and miss.

I'm aware of one particular range of hydraulic motors where the (very old) design rights have been sold on and a small specialist supplies parts to a limited size, but critical market.

Adrian R226/05/2020 09:35:10
20 forum posts
3 photos

Hydraulic motors are common on agricultural equipment, so if you happen to live in rural parts then an ag. engineering firm may be able to help.

Ady126/05/2020 09:38:26
3681 forum posts
514 photos

They always cost an arm and a leg 'dem things

You may get lucky and find a good ex-employee/tradesman, like with roofing/plumbing etc who charges sensible prices

Maybe if you you look for "refurbished" motors

Alistair Robertson 126/05/2020 09:39:14
90 forum posts
6 photos

Hi, Chris.

There are multiple types and makes of hydraulic motor but they almost all do the same job. They take hydraullic flow and pressure and convert it in to rotary motion which does the work required. Get the make of the motor and any numbers and I am sure an equivelent can be found that will work. You mention pistons and huge cost, perhaps it is a Hagglands motor as these two things go together when mentioning them!

Ady126/05/2020 09:40:57
3681 forum posts
514 photos

Hagglunds lol

We had their hydraulic cranes on one ship, omg

Mike Poole26/05/2020 10:02:47
2572 forum posts
60 photos

As with others I am not visualising this motor, a bit more info would help. Many of the components in an hydraulic motor have tight tolerance and finish and will require grinding equipment to replicate, material spec and heat treatment are other unknowns.

Alistair Robertson 126/05/2020 12:14:33
90 forum posts
6 photos

I've just had a thought. Many years ago we got a call to look at a piston type hydraulic motor, I think it was a Dunlop/Dowty type. It consisted of I think 7 radial pistons bearing on an eccentric central shaft/cam. The guide plates at each side had broken. We managed to get or make replacements and when we looked for a cause it was a sticky valve that was restricting the return flow and creating over pressure in the system. Whatever we did must have worked as we were never called in again and the company was only a few hundred yards down the road and we did lots of other work for them.

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