zf 5 problems - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 10 (permalink) Old 11-07-2012, 03:22 AM Thread Starter
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Post zf 5 problems

ok im new to the forum and i hope for some help i have a 94.5 f350 7.3 dit zf 5 bw 1356 87 and change original miles and my problem is that the truck grinds when going into reverse i have replaced the master and the slave and has been gravity bled a few times i have also redone the pin on the pushrod this truck has sat for a year before i got it and with snow coming i need reverse to plow driveways the only way i am able to go into reverse is to shut the truck off or already be rolling backwards all help will be very appericated thank you
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post #2 of 10 (permalink) Old 11-07-2012, 03:30 AM
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Re: zf 5 problems

You need to check the plastic bushing where the rod from master cylinder connects to the clutch pedal.

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post #3 of 10 (permalink) Old 11-07-2012, 03:37 AM Thread Starter
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Re: zf 5 problems

took that pin out seeing as how half of it was worn and ready to break so now a 1/2 in piece of round stock in there no movement at all at the push rod
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post #4 of 10 (permalink) Old 11-07-2012, 03:39 AM
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welcome sounds like your clutch is not fully disengaging
have you checked the bushings in the clutch box, the master cyl rod end and the lever where it connects to the shaft that goes threw the clutch box it don't take much slack in any of these to lose enough throw to not fully disengage the clutch

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post #5 of 10 (permalink) Old 11-07-2012, 03:43 AM Thread Starter
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Re: zf 5 problems

everything inside the cab is nice and tight
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post #6 of 10 (permalink) Old 11-07-2012, 07:22 AM
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Re: zf 5 problems

First, you need to fix your period and shift keys.

Next, you need to determine whether it's the hydraulics or the clutch itself that are inop. Get an assistant to work the pedal, and slide under the cab and measure how far the end of the fork moves as they work the pedal. It should be 1/2" - 9/16". If it's at least that, then the problem is "downstream" of that point - bent/damaged fork, pressure plate fingers, etc. If it's less, then the problem is upstream - bushings, etc. in the cab, or hydraulics. The hydraulics are a b!+c# to bleed; generally if you're going for a new master and slave, it's cheaper and more reliable to install a complete pre-built pre-bled master-line-slave assembly.
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post #7 of 10 (permalink) Old 11-07-2012, 09:14 AM
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Re: zf 5 problems

Only grinds into reverse? Not hard to get into any other gears?

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post #8 of 10 (permalink) Old 11-07-2012, 09:45 AM
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Re: zf 5 problems

If just gringing into reverse, synco is bad. Typical on a snowplow truck that is CONSTANTLY going forward and backward

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post #9 of 10 (permalink) Old 11-07-2012, 10:53 AM
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Re: zf 5 problems

put it in second to stop the transmission from spinning then go into reverse. that's what i do on my 4 speeds.

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post #10 of 10 (permalink) Old 11-08-2012, 03:41 AM
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Re: zf 5 problems

I'd say the syncro for reverse is bad if it shifts through the other gears fine

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