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Flying Finn

Runaway Truck

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We are currently in North Georgia getting ready to head toward Orlando/Tampa......or so I thought.  Warmed up the truck (2001 770 with an Eaton auto-shift) and put the truck in reverse, feathering the clutch to gently back toward the trailer.   All the sudden the truck fully engages in reverse (I barely released the clutch).  I mashed  clutch pedal to the floor....still going.....hit the brake still moving then finally had to turn off the engine to get it stopped.   After I collected myself pulled well ahead thinking  maybe my foot wasn't on the clutch correctly.  Same thing happened.  Clutch went to the floor, truck still going in reverse had to  shut off the engine to get stopped.

No error codes or service lights went off.  Any ideas on what the heck may have happened???

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Since you have a 2001, I'm gonna say it's likely you have the same three pedal system as we.  In that case, you have a clutch issue, not a tranny problem.  As Darryl said, check the fluid level in your clutch reservoir.  It's on the engine side of the firewall, outside the steering column.

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What Mark and Rickeieio said - We have the same truck w/ 3 pedal & autoshift ....Installing a new (different) reservoir & slave is pretty easy, Bleeding it is a pain is the A$$. And despite what it looks like, don't try to adjust the linkage, per the manufacturer.

PM me if you need more info.

Paul

 

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Definitely a clutch issue, but don't just go and throw new hydraulics on it. There are many other things it could be...throwout bearing may have failed, pressure plate may have failed, hydraulics may have failed. 

 

Proper diagnosis is needed.

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What Porky69 said is true. After giving it some thought, if it were a simple matter of low fluid, your clutch brake wouldn't have worked, and the auto shift would not have gone into gear at all.

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I once had an 18speed manual do pretty much the same thing, stepped on the clutch, put into gear like normal and took off. Next time I stepped on the clutch it worked normally as I stepped on it but as I was letting it up all of the sudden the pedal dropped to the floor and the truck stalled from rapid clutch engagement in a high starting gear. Upon disassembly/diagnosis they found that the clutch was pretty much worn out but the main cause was the throwout bearing had come apart.

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Wanted to follow up and let you guys know what was wrong.  The clutch master cylinder failed and the clutch slave cylinder was close behind.  Also had a hydraulic line that was cracked but not yet leaking.  Took the tuck to Vanguard in Adairsville, GA for the repair.  Cost for the repair was $1,300.00. They replaced both cylinders, hydraulic line, refreshed the hydraulic fluid, test drove.

So far so good.  Never saw that one coming.  If you have a Gen 2 auto-shift may want to have the clutch hydraulics looked at.

Could save you a catastrophic failure like I had.

Brad

 

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