explain pull type clutch

[boxh34d]

Hey there.
I have done some searching on the usual google, howstuffworks, and here, but I can't find anything on how a pull type clutch is different to a normal (push) clutch. ( I am aware how a push works )

Can someone please explain how the two are different??
Thanks

[oldcorollas]

umm.. pull type as in cable?
has a lutch fork that pivots on the far side of the box.. whereas push type pivotes between the outside and centre of the box.

[joecoolmk2]

here ya go, whipped this up just then

[brett_celicacoupe]

try google searching first and second class lever systems.

the only thing that differs is the relative position of the fulcrum, load ouput and force input

in short, the pull type clutches have the load output between the fulcrum and force input. the push type, or convertional hydraulic type have the fulcrum between the load ouput and force input.

[oldcorollas]

unless....
you mean the difference between clutches where the fingers on the clutch are pulled and pushed?
like these \/\/\/

ie, from exedy site

This pull-type clutch is disengaged by pulling, which is suitable for high-power engines.This is a Large-sized version for large commerscial vehicles.

and push type

[slide86]

pull type clutches are in isuzu based 4wd. ie rodeos and jackaroos. i know this cause i have done some at work and they are an absolute c**t to put the fork in the pressure plate when trying to get the gearbox back in.

basically it pulls the centre of the clutch out (away from engine) which lifts the pressure plate area off the clutch plate.

[Vios-GT_07]

eh really? does that apply to the diesel versions as well??

would u be able to tell me why isuzu jackaroos (trooper where i'm from) have clutch problems as early as 80,000 kms.. ? talking about the diesel powered versions here..

[Norbie]

The R154 and V160 are used with pull-type clutches... and no they don't use a cable, they're hydraulic.

[boxh34d]

Sorry, I should have been more specific.
Yes, I was referring to the R154 in my supra. 2 points to Norbie for reading my mind.
So, anyone care to clarify??
Forgot, + rep to where it's needed.

[Norbie]

From what I understand it is possible to get higher clamp for a given clutch size when using a pull-style arrangement.

This diagram might help you understand the physical differences:

[EVOSTi]

what people have said is correct.

but there are two things you need to know about pull type clutches that havent been mentioned.

firstly, pull type clutches are very expensive, ATLEAST double the price of a regular clutch. i did one on christians JZX90, it was a button clutch, cost about $800-$900 from memory and i got a good price from a mate who works at exedy. regular clutch was still several hundred dollars.

second, you cannot simply split the box from the engine and remove the box. pull type clutches always have some sort of clip holding the thrust race to the diaphragm. in an R154 this is fairly easy, in some other boxes such as those in V6 magnas its a prick. theres always an access hole in the bell housing that allows you to get a screw driver to the clip to release the thrust race.

[EldarO]

beleive me, the R154 was a prick too.

the "e" slip was a pain in the ass to get on the clutch fork, i have no idea how people with fatter fingers do it, as i barely managed, and i have long, slightly chubby fingers!

im not even sure if i got it on the whole way, but fucked if i was going to put in the effort to see!

Eldar.O.

[boxh34d]

Norbie, those pics explain it perfectly, thank you.

EVOSTi, yes, I have previously found out how much more expensive pull type are when I got a new clutch with uprated pressure plate for my MA71.

Thanks once again everyone.

[LeeRoy]

So on a pull type clutch is the pressure plate actually pulled away from the motor?

If so then does the pressure plate have a pivot/fulcrum thing in it and if so where? - im referring to how this pivot/fulcrum allows a normal "push type" clutch pressure plate to come away when pushed in.

- LeeRoy

[EVOSTi]

eldaro, r154 is easy, you should try a magna. ive had to undo the pressure plate bolts with the gearbox still attatched cause i couldnt undo the clip, that wasnt a quick or easy process.

leeroy, picture a regular pressure plate but with the thrust race on the other side ie between the diaphragm and the flywheel and you get a rough idea, works similar to a regular clutch but with the diaphragm moving in the opposite direction.