the 'todays job' thread

[AHPP]

Ones of those cable grabs (like on old ish school lanyards) for a little peace of mind until it gets a service?

[AHPP]

Or hang a weight mid line to keep tension on if you have to walk away for any period of time. 
 

Aware less convenient than the thing working perfectly but helps with visual check for tension, movement etc. 
 

Does it creep faster with more tension on?

Edited November 5, 2024 by AHPP

[Mick Dempsey]

We’re a two man outfit so I trust the groundy to give it a blip every 30 seconds to keep tension on.

It is in the winch itself as the motor has been refurbished and even replaced when that didn’t cure it. Though I made them send it back and put the old one on once we established the source of the problem.

Finding a competent engineer, familiar with the workings of these things is the issue.

 

Edited November 5, 2024 by Mick Dempsey

[AHPP]

Is it a hydraulic motor and then some

planetary gears like a truck bumper winch?

[Mick Dempsey]

If I’m honest I have no idea what goes on in there.

Clearly the Hydraulic motor turns something. 
What’s happening inside the drum is unknown to me.

[sime42]

It's a Black Box operation in fact.

 

 

[Mick Dempsey]

Thinking about it, it can’t be as simple as a turning a shaft inside the drum to turn the unit (in the same way as a motor turns a feed roller on a chipper) because that couldn’t generate the force that the drum produces.

[GarethM]

Doubt it has a reduction planetary gearbox, just relying on pure low capacity hydraulic grunt from pressure at 210-300 bar.

 

There's a calculator somewhere, plus it depends if it's a standard pump or a piston type.

 

Two hoses are in & out, smaller is just case drain back to the tank.

 

You'd be surprised how simple a lift assist cylinder is on a tractor, but two of those is 3-6 ton depending on model.

[Mick Dempsey]

13 minutes ago, GarethM said:

Doubt it has a reduction planetary gearbox, just relying on pure low capacity hydraulic grunt from pressure at 210-300 bar.

 

There's a calculator somewhere, plus it depends if it's a standard pump or a piston type.

 

Two hoses are in & out, smaller is just case drain back to the tank.

 

You'd be surprised how simple a lift assist cylinder is on a tractor, but two of those is 3-6 ton depending on model.

Then why the creep if the motor is replaced?

Even if the hydraulics are disconnected. 

Edited November 5, 2024 by Mick Dempsey

[GarethM]

Just now, Mick Dempsey said:

Then why the creep if the motor is replaced?

Even if the hydraulics are disconnected. 

Case drain I guess, plus hydraulics pumps don't form a complete seal internally and does bypass ever so slightly so always expect a little movement.

 

The big boy forestry ones a think have a clutch setup to prevent that creep.