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  1. #1

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    Nov 2012
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    Honda

    HRM215 Hydrostatic Transmission fluid change

    My mower hesitates moving when it is cold. The transmission seems to need some fluid. Already adjusted the cable and that initially helped.

    Does the hydrostatic transmisson need to be removed for this? I found a bolt to remove with the mower on its side but the fluid started coming out and I had to put it back! Fluids color was was not clear but greyish looking and has never been changed in 15 years of use (3 - 4 of them in storage).

    Thank you,

    Michael

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  3. #2

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    robert@honda's Avatar
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    Re: HRM215 Hydrostatic Transmission fluid change

    Quote Originally Posted by MichaelT1960 View Post
    My mower hesitates moving when it is cold. The transmission seems to need some fluid. Already adjusted the cable and that initially helped.

    Does the hydrostatic transmisson need to be removed for this? I found a bolt to remove with the mower on its side but the fluid started coming out and I had to put it back! Fluids color was was not clear but greyish looking and has never been changed in 15 years of use (3 - 4 of them in storage).

    Thank you,

    Michael
    Hi Michael:

    The HST fluid lasts a long, long time. Unless it's leaking, there's no need to check/change it. In fact, the shop manual says:

    HST oil will darken during use and may appear to contain fine metallic particles or residue. This is normal, and does not indicate excessive wear or an internal failure.

    Now, if you may have spilled some, so if the mower isn't performing (drive) as it used to, it's possible the fluid level is low.

    To add fluid, the entire transmission must be removed from the mower. Place the transmission on flat, level surface, and there's a large round cap held on with two bolts. Remove the cap and diaphragm. Add fluid to fill to the top of the case. Most important, only used genuine Honda HST oil. No other brand or type of oil is suitable for use in the transmission. You can get a quart (part number 08208-HST01) from any Honda dealer; here's a link:

    Honda Dealer Locater

    If you need help removing the transmission from the mower, reply back with the frame serial number (it's on the back edge of the deck, in the form of "MXXX-1234567") and I'll post a few pages from the shop manual with the full procedure.

    Finally, if the HST fluid level is very low or nearly empty, adding fresh fluid then doing a bleeding procedure is necessary. If you need it, I'll post those pages too, just ask.
    - - -
    Robert@Honda
    Caveat: I work for Honda, but the preceding was my opinion alone.

  4. #3

    Join Date
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    Re: HRM215 Hydrostatic Transmission fluid change

    Hi Robert,

    The Model number is #HRM215 3HXA
    The Serial number is #MZBB-6433105 JK

    Please post those pages of the shop manual showing me how to remove the transmission and how to do a re-fill.

    Thank you!

    Michael

  5. #4

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    Re: HRM215 Hydrostatic Transmission fluid change

    Michael, here's everything you'll need to do the service. Note the bleeding procedure is from the HRX model, but it's the same for your HRM mower. I also included the parts list and drawings, as they are sometimes helpful to have available.

    More than anything else, be sure to really clean the outside of the transmission before opening it up to service the fluid. It's vital that no dirt, debris, etc. get inside the transmission, so get it clean, and work in a clean environment. The transmission is a precision bit of kit, and won't tolerate dirt/crud down inside it.
    - - -
    Robert@Honda
    Caveat: I work for Honda, but the preceding was my opinion alone.

  6. #5

    Join Date
    Sep 2013
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    Re: HRM215 Hydrostatic Transmission fluid change

    Robert:
    You wrote a thread a couple years ago about replacing transmission in a Honda HR215. You attached a couple of files. However, I do not have a belt driven transmission, it is shaft driven (HR215HXA). I recently acquired the above 22 year old Honda mower that was stored on its front wheels for the last 20 years. After cleaning carburetor and replacing leaked out oil, it runs perfectly, but trans doesn't operate. Cables are adjusted properly, but there is little or no oil in tranny. Can I just add oil to case or do I need to remove tranny and fill and bleed on bench top? If so, can you send me the instructions for the shaft drive model?
    Thanks

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