the 'todays job' thread

[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 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!

 

 

 

 

 

 

[AHPP]

That looks like a lovely job. Conifers smell fabulous.

[openspaceman]

 

 

1 hour ago, openspaceman said:

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.

I used to have an Hinowa manual with track mot0r diagrams, the  final drive were an italian firm with a name like Bernouli but...

 

I found this (forgive the chinglish):

The swash plate motor and axial pistons circled blue provide the rotational power. The disc brake is applied by the springs and released when pressure is sent to the motor , a shuttle valve then allows pressure from either the forward or reverse lines to operate the brake piston to release the brake via a shuttle valve. The shuttle moves from the pressure side to block off the line to the other side.

[openspaceman]

1 hour ago, Mick Dempsey said:

I’ll get a pic tomorrow in the light. 

In the meanwhile; small Riko A frame pto winches had both a friction brake and a crude ratchet sprag clutch  which applied directly to "teeth" cut into one side of the cable drum. I never liked it  because if you winched in so far that the hook touched the fairlead when you left the pawl down inadvertently everything jammed up.

 

You could try something like this spring loaded one way wire rope clutch to hold tension, it is a beefy mechanical prussic like device.