the 'todays job' thread

[openspaceman]

4 minutes ago, Mick Dempsey said:

Then why the creep if the motor is replaced?

Even if the hydraulics are disconnected. 

There will always be creep as some oil from the high pressure side seeps past the spool valve or to that drain line on the motor. On track motors a brake is applied if there is no pressure being sent to the motor.

 

If it is leaking past the spool valve you could fit a check valve in the supply to the winch.

[AHPP]

What’s the brake on a track motor? I always assumed it was a check valve. 

[Mick Dempsey]

3 minutes ago, openspaceman said:

There will always be creep as some oil from the high pressure side seeps past the spool valve or to that drain line on the motor. On track motors a brake is applied if there is no pressure being sent to the motor.

 

If it is leaking past the spool valve you could fit a check valve in the supply to the winch.

Thanks, the spool valve is out of the equation, as I said, you can disconnect the hydraulics and the creep continues till it’s ‘happy’ with the pressure.

[GarethM]

4 minutes ago, AHPP said:

What’s the brake on a track motor? I always assumed it was a check valve. 

Bit impractical as you'd need two.

 

More likely it's not got a case drain and the valve block handles both forwards and reverse, effectively acts like a isolation tap and uses the weight and tracks as the dead weight.

[AHPP]

I do appreciate the effort put into the reply, Gareth but I couldn’t safely believe you if you told me grass was green. I actually have you ignored so I can’t accidentally learn anything dangerously wrong from you.
 

Hoping to hear from Andrew. I should have quoted him. 

Edited November 5, 2024 by AHPP

[GarethM]

5 minutes ago, AHPP said:

I do appreciate the effort put into the reply, Gareth but I wouldn’t believe you if you told me grass was green. I actually have you ignored so I can’t accidentally learn anything dangerously wrong from you.

Ignore whatever you want, but I'll think you'll find I'm not far from being correct.

 

Dangerously wrong!, are you actually taking the proverbial.

[openspaceman]

1 hour ago, Mick Dempsey said:

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.

Why not? Hydraulic motors are torquey even the gear motors. What's the pull and can you get a photo of the face plate for the specification?

 

The

[Mick Dempsey]

1 minute ago, openspaceman said:

Why not? Hydraulic motors are torquey even the gear motors. What's the pull and can you get a photo of the face plate for the specification?

 

The

I’ll get a pic tomorrow in the light. 

[openspaceman]

25 minutes ago, AHPP said:

What’s the brake on a track motor? I always assumed it was a check valve. 

I don't have a lot of experience of the guts of track motors but the motor is often a swash plate piston motor driving through a set of planetary gears for the big reduction ratio. Once pressure is removed a spring loaded transmission brake is applied to the motor shaft, often a band brake.

[Doug Tait]

Connie bashing this week, and next, probably the next, there's a few to do...

Couple of skip trailers a day and a lot of timber.

Climbing, winching, felling, thanks @Tom Dfor eliminating the drag!