Vagabondrobb 14 Posted April 2, 2021 Hi everyone, So my 2015 420 has lost 4WD to the front wheels. Local ATV mechanic reckons its the splines at the engine end of the front shaft. I'm guessing the shaft needs replacing, along with the joint that it connects to engine block with? Also, anyone know the best place to order parts from... in the UK? Cheers! Robb Share this post Link to post Share on other sites
Melatv 797 Posted April 2, 2021 Haven't seen that happen on 420 -- especial a 2015 -- take better look at it. 2 Share this post Link to post Share on other sites
Vagabondrobb 14 Posted April 3, 2021 So I put her up on sticks again and stripped the side off to get a closer look. To me it does seem to be worn splines, but perhaps there’s something I’m not taking into account? I uploaded a video showing the problem/inspection below, maybe a more experienced eye can confirm or shed some more light on the problem! cheers! Share this post Link to post Share on other sites
Melatv 797 Posted April 3, 2021 Hi: Is the lever connected to 4WD shift cable moving when you put it into 4WD? See red dot 2 Share this post Link to post Share on other sites
Vagabondrobb 14 Posted April 3, 2021 Hey, yes it moves with the lever. I did think it could be loose (it doesn’t move a great distance) so used some grips to twist it all the way but it didn’t make any difference... 1 Share this post Link to post Share on other sites
Fishfiles 20,147 Posted April 3, 2021 I would change #6 , it comes as an assembly , you might get by with just the collar #7 as that is the part the wears out , you can bet the shaft which is not sold separately is wore also 6 SHAFT ASSY., FR. PROPELLER 40400-HR3-A20 Ships in 2 to 3 days 2 Share this post Link to post Share on other sites
Melatv 797 Posted April 3, 2021 2 hours ago, Vagabondrobb said: Hey, yes it moves with the lever. I did think it could be loose (it doesn’t move a great distance) so used some grips to twist it all the way but it didn’t make any difference... Hi: That propeller shaft that is not turning is push into the shaft joint on the engine (spring loaded) -- when you put it in 4WD -- the picture in the post with red has to move far enough to operate the clutch fork to push the propeller shaft towards the engine -- it could be out of adjustment or something bent out of place or the front final clutch has a problem 3 Share this post Link to post Share on other sites
Vagabondrobb 14 Posted April 4, 2021 (edited) So should I see the shaft physical shift back towards the engine? This doesn’t happen. But shifting the pushing the 4WD lever does turn the arm (where the red dot is)... Edited April 4, 2021 by Vagabondrobb Share this post Link to post Share on other sites
Fishfiles 20,147 Posted April 4, 2021 I don't know how that set engages 4wd for sure , from looking at the print , the arm with the red dot moves the dog to make #8 and #9 mate for 4wd , so I would say the drive shaft doesn't move much if at all when shifted and it is stripped at the collar --- my 450 has that same collar and splines on the drive shaft , I have stripped it out before , front and back 1 Share this post Link to post Share on other sites
Vagabondrobb 14 Posted April 4, 2021 I guess the only way to tell for sure is to take it out and take it look! Share this post Link to post Share on other sites
Vagabondrobb 14 Posted April 5, 2021 21 hours ago, Fishfiles said: I don't know how that set engages 4wd for sure , from looking at the print , the arm with the red dot moves the dog to make #8 and #9 mate for 4wd , so I would say the drive shaft doesn't move much if at all when shifted and it is stripped at the collar --- my 450 has that same collar and splines on the drive shaft , I have stripped it out before , front and back Had another fiddle this morning and noticed that if 4WD is engaged then the shaft locks and will not turn (with the wheels are on the ground), but I can rotate it in 2WD. I guess this indicates that it is indeed the splines on the engine side that are stripped. Will bite the bullet and order a new shaft and joint... Thankyou both for the help! Robb 1 Share this post Link to post Share on other sites
Melatv 797 Posted April 5, 2021 Take it apart first -- do you have a service manual? 3 Share this post Link to post Share on other sites
Vagabondrobb 14 Posted April 5, 2021 Ok will do. I don’t have a service manual, can it be downloaded somewhere? ATV mechanic told me shaft can be removed by unbolting the diff and pulling it back a few inches. What could go wrong? 1 Share this post Link to post Share on other sites
Melatv 797 Posted April 6, 2021 Service manual for you https://drive.google.com/drive/folders/12hzs10L_Gwu0aVyp8vhmEXNdf2N2P7tk 3 Share this post Link to post Share on other sites
Vagabondrobb 14 Posted April 6, 2021 7 hours ago, Melatv said: Service manual for you https://drive.google.com/drive/folders/12hzs10L_Gwu0aVyp8vhmEXNdf2N2P7tk Amazing, thanks mate. Share this post Link to post Share on other sites
