Results 1 to 10 of 10
  1. #1
    ptscon's Avatar
    Join Date
    Jul 2013
    Location
    Toronto
    Posts
    3,398
    +1
    691

    Question Grease on pump/drive shaft splines?

    Is there supposed to be some kind of grease put on the splines where the shaft meets the pump? I re-assembled it and forgot to put anything there after changing my wear ring.


  2. #2
    JT jpt7779's Avatar
    Join Date
    Jul 2008
    Location
    Pittsburg, Texas Lake Bob Sandlin
    Posts
    3,988
    +1
    767
    Very little, if any. Too much grease will cause the drive shaft to move forward and break the carbon ring seal.

    Some guys will use a small amount of anti-seize.

    Bottom line, it is not necessary.

  3. #3
    This is how I run a jetski shop in the desert nmpeter's Avatar
    Join Date
    May 2008
    Location
    Elephant Butte New Mexico
    Posts
    7,431
    +1
    1,766
    I'll politely disagree. Those splines do need lubrication and rust prevention.

    Of course if your impeller seal is 15 years old it won't matter much

    I'd bite the bullet and pull it apart to lube it.

    what is it really going to take-15 minutes?


  4. #4
    ptscon's Avatar
    Join Date
    Jul 2013
    Location
    Toronto
    Posts
    3,398
    +1
    691
    Arrrr so put some marine grease on it? I just put on a new boot since the old one had threads missing and was flying around the drive shaft. Is the boot meant to keep that area water tight?

    Some people run without that boot so always exposed to water, wouldn't any lubricant just get washed off?

    I'm in freshwater btw.

  5. #5
    This is how I run a jetski shop in the desert nmpeter's Avatar
    Join Date
    May 2008
    Location
    Elephant Butte New Mexico
    Posts
    7,431
    +1
    1,766
    yeah, just brush some marine grease on it ( don't go nuts ) I put a couple of drops of gear oil in there too)

    with a new impeller seal that grease will stay in place for a while.

    Without the boot, the pumpwash will clear the grease out quickly.

    and if you happen to run over a shallow sandbar.......

    I will say that I rarely see the driveline fail at the impeller end, it's always at the pro end.

    I tend to follow manuals when it comes to stuff like this. Saves on legal fees.

  6. #6
    Banned User
    Join Date
    Nov 2014
    Posts
    200
    +1
    13
    Yes, a coating of synthetic grease is required on the drive's splines and within the impeller's spline cavity as well. (Manual says apply synthetic grease generously) though I learned the hard way that it will cause improper fitting if to much is put in.

  7. #7
    ptscon's Avatar
    Join Date
    Jul 2013
    Location
    Toronto
    Posts
    3,398
    +1
    691
    Since there are no moving parts in there what purpose, other than assist with future removal, would grease serve?

  8. #8
    JT jpt7779's Avatar
    Join Date
    Jul 2008
    Location
    Pittsburg, Texas Lake Bob Sandlin
    Posts
    3,988
    +1
    767
    The Shop Manual DOES says put some grease on the splines.

    I ride in fresh water only and have never had rust or corrosion issues.
    I have used a small amount on the drive shaft and impeller splines and other times I didn't.
    Every time, I have removed the pump there is never any grease on either of the splines, always dry.
    That tells me the pressure in there, even with an impeller nose cone, pushes the grease out.
    Those that run without a nose cone, definitely have no grease that remans in place.

    IMO, it is used to ease the re-installation of the draft shaft and impeller. You mileage may differ……….

  9. #9
    This is how I run a jetski shop in the desert nmpeter's Avatar
    Join Date
    May 2008
    Location
    Elephant Butte New Mexico
    Posts
    7,431
    +1
    1,766
    Quote Originally Posted by ptscon View Post
    Since there are no moving parts in there what purpose, other than assist with future removal, would grease serve?
    actually, there are moving parts involved.

    note that the driveshaft splines have a slightly football type shape to them.

    as the engine is jinking around on the mounts the driveshaft plane shifts slightly.

    The ball shape allows a slight movement off the centerline to the driveshaft as this is going on. Otherwise the shafts would fail quickly.

    as the engine goes from power to coast the load on the splines change, and lubrication is vital to reduce wear.

    shafts fail at the pto end as there is the most movement there.

    best practice is seldom followed unless you are aware of the issues, or you've had an expensive driveline failure and got schooled on it.

    Not a bad idea to pull the pump every other season, inspect it, regrease the splines and reinstall.

    If your grease washes out after one season, you need to use better quality grease made for this type of application and perhaps change the impeller seal ( like all other rubber parts, they age and shrink)

  10. +1 by:


  11. #10
    3ftDeep's Avatar
    Join Date
    Mar 2014
    Location
    White Rock, BC
    Posts
    381
    +1
    112
    Check out minute 3:11 on the following video. It'll show you what you should do in the future ...

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. grease nipple on the drive shaft of 780 - 96
    By ktheake in forum Polaris Open Discussion
    Replies: 15
    Last Post: 01-24-2012, 08:35 AM
  2. thoughts on rr drive shaft seal
    By stevorxp007 in forum 4-Tec Performance
    Replies: 3
    Last Post: 09-30-2010, 10:47 PM
  3. WTB WTB--'Short' pump drive shaft and Thru-hull bearing
    By johnsonmtz in forum Polaris Classifieds
    Replies: 5
    Last Post: 07-05-2010, 10:36 PM
  4. drive shaft spline tool??
    By WAGZ102 in forum Yamaha How To & FAQs
    Replies: 1
    Last Post: 04-20-2008, 05:50 PM
  5. Extended Pump Drive Shaft Size?
    By howie099 in forum Polaris PWC Performance
    Replies: 2
    Last Post: 06-29-2007, 11:17 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •