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  1. Keith_J

    CUCV Throttle Vacuum Valve Adjustment

    18" Hg. If the vacuum is high all the time, shifts will be sluggish. Hard shifts are a sign of vacuum leakage or modulator fail, not regulator issues. The TH400 is designed for a gasoline engine which has high vacuum at idle and coast, medium vacuum at mid power and low vacuum at high power...
  2. Keith_J

    CUCV Throttle Vacuum Valve Adjustment

    Got the new valve installed. Adjusted it to "that looks about right" before hooking the vacuum pump and gauge to it. Pulled the vacuum and BAM!, 8" Hg on the first attempt with my home made wood block. Buttoned it up and took it for a test spin, like new shifting. This should help the PTO...
  3. Keith_J

    CUCV Throttle Vacuum Valve Adjustment

    The vacuum regulator would not adjust. I got it to move, regardless of position, vacuum out was the same as vacuum in. So I did what I always do, I tore into it. The main sealing element for the regulator is shot, causing it to leak regardless of tension on the spring. The tension is set...
  4. Keith_J

    CUCV Throttle Vacuum Valve Adjustment

    Great write-uo! I've been having soft shift issues with very sluggish downshifting at wide open throttle. I checked all vacuum lines, no leak. Vacuum pump pulls a pulsating vacuum 18-20 " Hg, vacuum at the modulator is 15" Hg and rising slowly, not responding to any throttle position. From...
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