Sheave blocks for Mk3 and Mk4

[Diana Alan]

Hi does anyone know what specification (tons) are the sheave blocks that were used with winches on the 4X4 inters?

[stephendavis]

do not know but steve d has one

[stephendavis]

the details are stamped on them

[Diana Alan]

the details are stamped on them

That's good advice when you don't have one to read.

[john.k]

I d assume they were 10ton,as the winch line pull was 9ton.I have a WW2 Westinghouse Bendix block from a GMC,which has never broken when in use.Actually,I had a dozen of the blocks,and sold the lot to a local collecter,then found another one lying in the dirt,rusty but ok,and I was using it last week when I got my Leyland bogged in the back yard.The Leyland has an ACCO winch hydraulically driven mounted in the tray,and I used the block to get some pull back into the truck chassis.It pulled the truck from axle deep with the engine idling.The hard part was dragging 50 metres of 3/4 wire down the yard to connect up to the nearest solid tree.My knees still havent recovered.Regards John.

[Diana Alan]

I was thinking it 8 ton because of the GVM of the truck, but 10 would give a good safety margin.  Thanks.

Lots of sympathy for your pain, was climbing in and out of the truck all last weekend as we had it out for its first camping weekend at Camden Park Open House.  With all the rain Sunday it needed 4WD to climb the hill to get out of the campsite loaded with the Club gear.

P.S. I don't expect you can get poly rope for that capacity winch, my Disco4 has poly and its much easier to spool out and lighter on the vehicle.

[boxy]

Try this place

http://www.sydneyrope.com.au/dyneema-sk75?gclid=CPHz7KzRoc8CFQuZvAodlwsPtw

[Diana Alan]

Thanks Boxy, but I met a bloke the other day that has a number of Army surplus sheave blocks of various capacities but he needed to know which one.  He also thought he has a full set of wheel chains for the CES. 
 
oops you were talking about the poly, my bad 

[Ravvin]

At a rough estimate, you could put 130m of the 12mm rope on and it would take up around the same space as the 16mm steel cable and have a breaking strain of 16.4t.
Or you could fit 190m of the 10mm stuff which has a breaking strain of 10.7t.

I've never used poly winch ropes. Wouldn't you have to run it all out and wind it in under full tension to stop it cutting into the layers below, then unwind it after and rewind it at normal tension for storage, like fishing line on reels? I know if you don't do that with fishing reels you risk the wet line shrinking as it dries, deforming the reels and the layers below it. I actually had an aluminium reel burst from not feeding it out and winding it back in after dragging in a heavy fish and putting it away under tension.

Not cheap at around $1900 ex gst either way, but I recently priced replacement steel cable and it was going to be $1600 for 75m of 16mm.

Greg.

[Diana Alan]

Hi Greg

I do run out my poly rope after winching and wind it back on under tension (usually something like a spare wheel) usually when I get back home. However more than steel rope it will still wedge itself between the layers below.

Similarly I re-wind the steel rope on the Perentie, but haven't done the Mk3 yet. I should probably grease it at least.

My thought on the poly was for the Leyland

[boxy]

Poly rope has to go on messy not nice and neat like SWR

We use it on our work Utes and it's great.

[john.k]

I always put the minimum length of wire rope on a winch or crane.On the Leyland ,I have about 12 metres of 5/8 non rotating.This fills the first layer on the drum.Extra length is by using slings about 10m long with eyes either end.Underbody winches are murder on cables,and if you dont unwind the whole cable,as soon a tension comes on it will wreck any other cable it crosses.If you have a drum full of cable,half will be wrecked on the first load,and it will pull down between the layers and jam on,and certainly not be removable by manual pulling out.Im amazed at the cost,i d better save all the new wire I have lying about.Ill start by picking up the length I got out last week.Wire rope is not nice when the slasher gets tangled in it,and it has happened.Regards John.

[Muzungu]

If you are using the block to increase pulling capacity I would be going double the line pull of the winch.
The reason being you may overload the snatch block if it is only rated the same as the line pull.

[john.k]

I dont know if any of you are watching "Highway Thru Hell",but its amazing at the small diameter of the sheaves in the snatch blocks they use.Of course when youre humping them and a length of 3/4 or bigger wire down a cliff,any weight saving is good.I remember that years ago,the Qld Machinery Inspectors would not allow the use of a Holmes wrecker because they would not allow the small diameter of sheaves used throughout the boom setup.Now, of course they wont allow any kind of wire lift,only hydraulic.Queensland was allways known as the hillbilly state,and nothing has changed ,only a new generation of idiots for machinery inspectors.Regards John.