Zerk Fittings for Splined Drive Shafts

The "Pimp my Ride" section for Soviet bloc bikes. Everybody seems to have their own custom add-ons, modifications & accessories. Share your tips and post pictures of them here.
Forum rules
This is the place for topics concerining modifying and accessorizing your Ural or Denpr.
Post Reply
User avatar
Scott C
Hero of the Soviet Union - 2020
Hero of the Soviet Union - 2020
Posts: 253
Joined: Wed Jun 15, 2011 12:01 pm
Location: St. Paul, Minnesota

Zerk Fittings for Splined Drive Shafts

Post by Scott C » Sun Mar 22, 2015 4:37 pm

Over the winter I overhauled the final drive on my 2011 Patrol. (Thank you Billy G.) It was an obvious opportunity to add Zerk fittings for greasing the splines on my drive shafts. Pumping grease into a Zerk fitting is much easier than taking off the final drive.
FILE0080_levels_small.jpg
Put the holes for the Zerks as far into the splined shaft receiver as possible so the new grease pumped in pushes the old grease out. For the drive shaft from the transmission to the final drive, position the hole so it goes through the thick part of the spline. It will provide more threads for holding the Zerk and if centered correctly, the end of the Zerk fitting won't have to be filed down to clear the splines. It's not an issue on the sidecar drive shaft. The splined area ends well before the place the fitting is installed.
FILE0085_levels_small.jpg
A drop of thread locker helps keep the fitting in place. Use a flush fitting on the transmission to final drive shaft.

This is a good place to express appreciation to Gobium for his videos on adding a grease fitting to the drive shaft from the transmission to the final drive. He had the integrity to shoot a second video about clearance issues someone else ran into when installing a fitting. It's easy to show off a success. It takes some guts to point out problems that might be encountered. Thanks Van.

That takes care of the drive shaft from the transmission to the final drive. There is a slight detail that needs to be taken care of on the sidecar drive shaft.
FILE0092_0093_small.jpg
The sidecar driveshaft is hollow and needs to be plugged. Not only plugged but plugged well enough to withstand the 2000 - 6000 psi of pressure a hand operated grease gun can create.

I decided to plug the driveshaft with flowable silicone, specifically Permatex 81730 Flowable Silicone Windshield and Glass Sealer. Silicone sealer has a very wide operating temperature and remains flexible to absorb the pressure pulses from a splined shaft moving in and out as the Ural suspension makes a modest attempt to smooth out bumps in the road.

A 3/4" plastic plug was coated with RTV, guided with a 5/16" wooden dowel and pushed into place with a deep well socket on an extension. The plug was held in place while the RTV cured overnight.
FILE0097_levels_small.jpg
It took three 1.5 ounce tubes of flowable silicone to fill the driveshaft. Be patient and don't try to fill the shaft too quickly. Air needs to come out as silicone sealant flows into the shaft. Let the silicone cure overnight. It might be easier to plug the shaft on the sidecar side and fill from the splined side. Try it and let us know.
FILE0102_levels_small.jpg
No more final drive removal to grease the splined shafts, just a rag, a grease gun and a few minutes.
You do not have the required permissions to view the files attached to this post.
Last edited by Scott C on Sun Mar 22, 2015 10:10 pm, edited 1 time in total.
Scott C
1977 BMW R75/7 (since new)
2011 Ural Patrol   (since new)

Bad monkey! Give me those matches!

Poacher Bob
Order of Lenin
Order of Lenin
Posts: 1681
Joined: Sun Dec 18, 2011 1:02 pm
Location: White Mts. NH

Re: Zerk Fittings for Splined Drive Shafts

Post by Poacher Bob » Sun Mar 22, 2015 5:10 pm

:clap:

:bow:
1996 FLHPI/TLE
1999 KLR 650
2003 KDX 200
2002 FLHTCI
2006 Patrol
2005 KTM 950 ADV

gobium
Order of Victory
Order of Victory
Posts: 15785
Joined: Wed Sep 07, 2011 2:06 pm

Re: Zerk Fittings for Splined Drive Shafts

Post by gobium » Sun Mar 22, 2015 5:26 pm

:clap: :cheers:

silverdog
Comrade Colonel
Comrade Colonel
Posts: 399
Joined: Sun Oct 28, 2012 12:44 pm
Location: Eastern oregon

Re: Zerk Fittings for Splined Drive Shafts

Post by silverdog » Sun Mar 22, 2015 8:29 pm

Good work.
2012 gobi

AZer
Comrade
Comrade
Posts: 86
Joined: Thu Mar 03, 2016 11:07 pm
Location: SE PHX Area, AZ

Re: Zerk Fittings for Splined Drive Shafts

Post by AZer » Tue Apr 26, 2016 12:33 am

Very nice. After 1+ year and I'm assuming at least one use of the zerk fittings, any feed back about this mod?

Thanks
Mike
:o
2015 Gear-Up
2013 KLR
2011 Concours
1971 CL350

keetmanaa
Comrade Colonel
Comrade Colonel
Posts: 350
Joined: Tue Jun 02, 2015 1:27 pm
Location: north Georgia

Re: Zerk Fittings for Splined Drive Shafts

Post by keetmanaa » Tue Apr 26, 2016 9:44 am

I'm also interested
2015 Gear Up
2010 Yamaha WR250R
2004 DL650 V Strom

User avatar
markhas
Order of Lenin
Order of Lenin
Posts: 1379
Joined: Tue Nov 20, 2007 10:25 am
Location: Whiskysconsin

Re: Zerk Fittings for Splined Drive Shafts

Post by markhas » Tue Apr 26, 2016 5:55 pm

This is not new. I did this mod several years ago following a post here on SS.
markhas
AMA member
ABATE Wisconsin
06' Tourist 41167/over 75,000Km, 91" 750 Honda Nighthawk sold to my buddy Ernie, we keep in touch.

AZer
Comrade
Comrade
Posts: 86
Joined: Thu Mar 03, 2016 11:07 pm
Location: SE PHX Area, AZ

Re: Zerk Fittings for Splined Drive Shafts

Post by AZer » Tue Apr 26, 2016 8:53 pm

I knew that it was not new, that's why I asked how it has worked out for you.:-)

I think it was Scott C that posted his accomplishing this mod that I responded to if that matters....

Thx
Mike
:o
2015 Gear-Up
2013 KLR
2011 Concours
1971 CL350

User avatar
Scott C
Hero of the Soviet Union - 2020
Hero of the Soviet Union - 2020
Posts: 253
Joined: Wed Jun 15, 2011 12:01 pm
Location: St. Paul, Minnesota

Re: Zerk Fittings for Splined Drive Shafts

Post by Scott C » Tue Apr 26, 2016 10:52 pm

The zerk fittings are working fine. They get a couple of shots of grease with every oil change.
Scott C
1977 BMW R75/7 (since new)
2011 Ural Patrol   (since new)

Bad monkey! Give me those matches!

AZer
Comrade
Comrade
Posts: 86
Joined: Thu Mar 03, 2016 11:07 pm
Location: SE PHX Area, AZ

Re: Zerk Fittings for Splined Drive Shafts

Post by AZer » Tue Apr 26, 2016 11:07 pm

Thanks Scott! The pics you posted show that you did a nice job with that mod!
Mike
:o
2015 Gear-Up
2013 KLR
2011 Concours
1971 CL350

User avatar
Wildhorse Cafe
Hero of the Soviet Union - 2020
Hero of the Soviet Union - 2020
Posts: 2244
Joined: Mon Sep 08, 2014 5:28 pm
Location: King City, California

Re: Zerk Fittings for Splined Drive Shafts

Post by Wildhorse Cafe » Wed Apr 07, 2021 11:37 pm

2011 Patrol, The Higgs Bison Super Collider, formally known as, the Orange and Silver Pumpkin Coach.

2013 Black Retro, Chernaya Krasota, formally known as, my name is nobody.

When you set out on your journey to Ithaca
pray the road is long , full of adventure, full of knowledge
not expecting that Ithaca will offer you riches
Ithaca has given you the beautiful voyage

C.P. Cavafy

Post Reply