Zf6 clutch help

rjustman · Nov 30, 2015

I have the weirdest thing happening with a zf6 clutch..I can't get the truck to go,in gear with clutch depressed so I started truck with truck in gear,it started to move forward.after I got truck started I let clutch out slowly and truck STOPPED moving..so I pushed clutch back IN and the truck started moving..I can run through all the gears,all forward and reverse with clutch pedal out and truck running..but when I depress,clutch pedal the truck moves..like the clutch is backwards or something..anyone have any idea?? I just spent 800 on a south bend but this is weird..

Overdrive · Dec 2, 2015

Clutch fork installed backwards?

rjustman · Dec 2, 2015

No..it's installed correctly far as I can tell may be broken..but either way don't really explain why it would work backwards..the slave still pushes against it,not pull away from it ya know..south bend thinks I have somw,broken springs..Sunday will tell all when new clutch get a here and I pull it apart..

JSchuricht · Dec 2, 2015

Best guess is the pressure plate. Typically it pushes the clutch against the flywheel and releases when the pedal is pressed in. If it's broken or not installed right (having a hard time picturing that) then pushing the pedal in could be pushing the plate into the clutch and the pressure plate could be coming away from the clutch when your not stepping on the pedal. Your going to have to pull the trans off to see what is going.

Now that I have had a minute to think about it, I bet the pressure plate came unbolted from the flywheel or is broken where it mounts to the flywheel.

rjustman · Dec 2, 2015

I'm kinda eager to see what's going on..I'll post pics of findings...my uncle's been a mechanic for 42 years and all he did was laugh.

How often or does it really happen,do the clutch forks break or bend in these trucks..I have a 2000 was it in 99 and 2000 that they had a weaker fork then was upgraded in 2001?? Where would I get one? Dealership only??

Overdrive · Dec 3, 2015

You should be able to pull the inspection cover. Before going through and unbolting the transmission.

rjustman · Dec 3, 2015

Could find an inspection plate?? The one I did find that was t the front of the bell I took off..could not see flywheel..nothing else

mandkole · Dec 3, 2015

Can you pull the bottom inspection plate on the bellhousing, have someone work the pedal, look up in there and see what the clutch assembly does? Definitely sounds like something is assembled incorrect or broken.

Overdrive · Dec 3, 2015

Your clutch disc could be facing the wrong way
Make sure the fork is seated right
Fingers aren't bent

rjustman · Dec 3, 2015

I pulled bottom inspection plate and all I could see was engine side of flywheel..unless im not pulling right plate..

mandkole · Dec 4, 2015

they must be different than the zf5 then--I could actually see the disk lining and whole assy. Easy to see much it was worn.

rjustman · Dec 4, 2015

I couldn't see anything besides the front side of flywheel..the clutch,new fork and pivot all came in today.so hopefully Sunday I'll have an update

rjustman · Dec 6, 2015

Well parts came in and I got to the point of dropping trans and the stupid thing won't come out..anyone ever used a comealong around rear axle and pull it out..

lincolnlocker · Dec 6, 2015

rjustman said:
Well parts came in and I got to the point of dropping trans and the stupid thing won't come out..anyone ever used a comealong around rear axle and pull it out..

110% positive you have all the bolts out? it should slide back with a lil help but id say something is definitely wrong.

live life full throttle

rjustman · Dec 6, 2015

3 bolts in starter and 6 in bell housing right..2 on each side and 2 up top..4 long and 2 short

79jasper · Dec 6, 2015

Took the dust cover off?
What about the cooler lines?

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mandkole · Dec 6, 2015

If the clutch was engaged earlier with the pedal out, the disk may have moved. Sounds like its jammed between the input and clutch disk-- perhaps stick it in gear and rock the output yoke back and forth. Maybe tap the throwout lever with a soft hammer?