50” Sickle SMS-50? Parts Inquiry

["Manic-Mechanic" 1,326]

Picked up a functioning 50” sickle which been watching for, forever!

I couldn’t identify this unit, appears to be a “hodgepodge” of parts, but it functions and has solid yoke.

As rare as these are here best to jump on it, regardless!

(Not sure exactly what model of 50" as the rear bracket does not extend, maybe SMS-50 or 95% of one!)

(Nice Winter protect to rebuild)

 

 

 

Pedal Assembly:

I see the part numbers in the SMS-50 manual

82-3380 Ass'y Pedal Trip

85-3381 Pedal

87-3760 Clip

 

Pedal Assembly-1055 manual

79-4246

80-4239

Which I will modify part 4239 over to 3381 by drill & tap 5/16-18 hole

 

Edited October 21 by "Manic-Mechanic"
Added pictures

[ri702bill 10,074]

Note that the flat bar #82 may or may not have a "Z" bend. Pedal #80 and Pivioting latch #79 should be the same.

["Manic-Mechanic" 1,326]

Then the "Z" bend I can take care of, that's good news! There's a couple of other things not sure of like the lift rod placement. Theres the rear bracket which is easier for me to work with. On the 800 Special I may be able to drill a hole in the existing cross member, know soon enough. "Improvise, adapt and overcome"

Edited October 18 by "Manic-Mechanic"

[gwest_ca-(File Mod) 11,745]

7-1321 has a 42" bar.

This link should take you to all the 50" bars but in no particular order

https://www.wheelhorseforum.com/search/?&q="Mower Sickle Side 50in"&type=downloads_file&search_and_or=or&sortby=relevancy

["Manic-Mechanic" 1,326]

I couldn't find the one like this:SMS-50? Whatever it is I can adapt it but would like to know, the paper tag is faded so it's older for sure.

Edited October 18 by "Manic-Mechanic"

[gwest_ca-(File Mod) 11,745]

SMS-506 or newer?

["Manic-Mechanic" 1,326]

The assembly resembles the SMS-506 but has a U bracket. SMS-506 has a whole assembly that I do not.

Instead, I have this U pictured

Edited October 19 by "Manic-Mechanic"

[gwest_ca-(File Mod) 11,745]

Are you taking about item 65 near the top of the page?

["Manic-Mechanic" 1,326]

On 10/18/2025 at 7:59 PM, gwest_ca said:

Are you taking about item 65 near the top of the page?

The two sickles use the same flanged bearing within the shaft support ass'y.

SMS-50, part 1968

7-1311, part 5269

Why the numbers differ, I am not sure....

(However, it is 3/4 bore 52mm od)

 

 

Edited October 25 by "Manic-Mechanic"
corrected bearing needed

[gwest_ca-(File Mod) 11,745]

I was looking for a U-bracket.

["Manic-Mechanic" 1,326]

6 minutes ago, gwest_ca said:

I was looking for a U-bracket.

 

Not sure what this is called, not in the SMS-50 parts. Closest thing is in the 7-1311 manual

0 

 

Diagram number 66, part 7615, but it has a sliding rod

["Manic-Mechanic" 1,326]

The 800 Special frame much like the A90.

 

The rear sickle mount falls just in front of the cross member.

(Don't mind the dust this project set for over a decade on the side lines)

 

 

So, basically just below the dash tower. 

It is 19" from the rearward edge of the side plate, so a mount be will right on the cross member.

I realize this is unorthodox, apologies to the purist among you... 

 

Edited October 19 by "Manic-Mechanic"
glitches!

[gwest_ca-(File Mod) 11,745]

Will bet yours has the sliding rod also. That is why it has a set screw collar on it.

[peter lena 9,460]

@Manicmacanic  great opportunity  , to ENHANCE  / INSURE , VERIFY  EVERY  SLIDE . ROTATIONAL POINT ,  polyurea rated lube , insures smooth / easy  function , never done a sickle , but  , thought about  every stage of  issue . the  PTO LEVER SET UP  ,is often neglected , sloppy , and lacking  improvement , the  insured , drag  and engagement on that area , can and should be improved . those bearing's  probably  have a minimal  lube , incremental  rotational  , hang ups start  a  resistance to  function . looks interesting to me . improve as you go , pete     

["Manic-Mechanic" 1,326]

8 hours ago, gwest_ca said:

Will bet yours has the sliding rod also. Thatass is why it has a set screw collar on it.

No, set collar for depth control only, no rod.

Betting this unit is a combination of sickles married.

This is ass'y bracket, but no rod

 

You can see this is solid

 

This frame is not from SMS-506

 

That and its locked tight, set on some other sickle likely in the weather a lot longer

Edited October 19 by "Manic-Mechanic"

["Manic-Mechanic" 1,326]

1 hour ago, peter lena said:

@Manicmacanic  great opportunity  , to ENHANCE  / INSURE , VERIFY  EVERY  SLIDE . ROTATIONAL POINT ,  polyurea rated lube , insures smooth / easy  function , never done a sickle , but  , thought about  every stage of  issue . the  PTO LEVER SET UP  ,is often neglected , sloppy , and lacking  improvement , the  insured , drag  and engagement on that area , can and should be improved . those bearing's  probably  have a minimal  lube , incremental  rotational  , hang ups start  a  resistance to  function . looks interesting to me . improve as you go , pete     

Yes indeed! I will dismantle it and change bearings, verify solid contact points and alignment.

Remove every bolt and polish, replace as needed.

Then while apart make accommodations on the tractor frame prior prep & paint.

Use the best grease too Pete!

[peter lena 9,460]

@Manicmacanic  regularly  suggest  detailing , found that to be the greatest  improvement  to a number of horse issues , realise that many  use the book for every / anything , which is ok , but you will never  find a suggestion , of smooth efficient operation ,  personally  look at any intended movement start , as an area to  ENHANCE . make smooth / easy  efficient usage . just a PTO LEVER START POINT , next to battery tray , is amazingly  simple / easy ,  like this  , try / test / try . experiments tried on  my  c-85  and adapted to  , 2 other horses , REPEDIVE  ISSUES  are what you want  , for a change to eliminate them . pete 

 

["Manic-Mechanic" 1,326]

8 minutes ago, peter lena said:

@Manicmacanic  regularly  suggest  detailing , found that to be the greatest  improvement  to a number of horse issues , realise that many  use the book for every / anything , which is ok , but you will never  find a suggestion , of smooth efficient operation ,  personally  look at any intended movement start , as an area to  ENHANCE . make smooth / easy  efficient usage . just a PTO LEVER START POINT , next to battery tray , is amazingly  simple / easy ,  like this  , try / test / try . experiments tried on  my  c-85  and adapted to  , 2 other horses , REPEDIVE  ISSUES  are what you want  , for a change to eliminate them . pete 

Yes, I conquer totally. I build a lot of custom PTO's. Repetition is definitely key

 

 

I built this utilizing three models of wheel horse to get the PTO & Clutch to function flawlessly

Edited October 19 by "Manic-Mechanic"

["Manic-Mechanic" 1,326]

I have question about the unit in general:

Should my hangers be set so that the sickle frame is level-5-1/2" down as is the ass'y shaft support?

["Manic-Mechanic" 1,326]

Also, the support can be set closer to the foot or back directly aligned with the drive pulley?

 

I mean the hangers would be ideal if the support is directly aligned with the drive pulley.

would require a set of holes added to the frame.

 

As seen on the earlier machines the support is off center of the drive and closer to the foot rests

Edited October 19 by "Manic-Mechanic"

["Manic-Mechanic" 1,326]

On 10/18/2025 at 3:53 PM, "Manic-Mechanic" said:

Then the "Z" bend I can take care of, that's good news! There's a couple of other things not sure of like the lift rod placement. Theres the rear bracket which is easier for me to work with. On the 800 Special I may be able to drill a hole in the existing cross member, know soon enough. "Improvise, adapt and overcome"

This is the part used on the SMS-50 for idler, diagram 87, part 3760 called a clip also.

["Manic-Mechanic" 1,326]

On 10/18/2025 at 3:49 PM, ri702bill said:

Note that the flat bar #82 may or may not have a "Z" bend. Pedal #80 and Pivioting latch #79 should be the same.

This will be getting a 5/16-18 hole drilled and tapped to accommodate 3760 and the pulley 1623, again becoming 3381

Edited October 21 by "Manic-Mechanic"