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Subject: POTO Shaft Seal Replacement

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Charles Hudson    Posted 06-27-2021 at 12:28:06 [URL] [DELETE]        [Reply] [Email]  
  • POTO Shaft Seal Replacement
  • While cleaning the hydraulic pump I removed the PTO shaft and on Bruce's advice disassembled with the aim of replacing the seal. After removing the inner circlip I was able to drive the shaft, bearing and sleeves out the inboard end of the PTO's outer housing. I then removed the inner circlip and drove the seal(using a BF socket and a two pound sledge) out the inboard end.

    The shaft splines were in reasonably good shape; some surface rust but well-defined, not rounded or broken. The threads inside the housing, into which the PTO safety cap thread, were in worse shape, indicating water had leaked in or condensed there from operation. Using a dental pick I cleaned them and the clip grooves, which had the remnants of maybe RTV in them. No idea why.

    The bearing seems in good shape: It turns freely, not gritty or with palpable flat spots. In an ideal world I would replace it but getting the bearing and sleeves off and back on would be a sizable task. The shaft rotates at 500 RPM when the engine is rotating 2200 RPM, so I'll leave that task for later.

    The seal was in very poor shape and the sealed surface of the outboard sleeve was rusty and pitted. I cleaned it, wire-brushed it and sanded with #200 and #500 sandpaper, then cleaned it again.

    The remaining task, and the reason for the post, is the install of the new seal. Two questions: Is it better to install from the outboard end of the housing or the inboard end? Is this a job best left for a machine shop?

    Thanks for your suggestions.
    -CH-

    Pics:
    https://drive.google.com/file/d/1Al86xu100AEn_o_dbX1YKOwX1uYwA69Z/view?usp=sharing, https://drive.google.com/file/d/1MRqRXY0Qaug-7k_b9-7Jg-F3bw8X2X5R/view?usp=sharing, https://drive.google.com/file/d/1mYhnOUpjIMRm71yFBun4iv9dvHmMmycv/view?usp=sharing

    Gaspump    Posted 06-28-2021 at 09:47:00 [URL] [DELETE]        [Reply] [No Email]  
  • Re: POTO Shaft Seal Replacement
  • Whenever a seal is replaced it is best to also replace the sleeve on the PTO shaft. It is an inexpensive part, easy to install and insures against leakage from the new seal.

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