too much transmission mainshaft thrust?

Post Reply
vitza
Posts: 49
Joined: Fri Apr 15, 2011 10:51 am
Bikes: panhead project
Location: california

too much transmission mainshaft thrust?

#1

Post by vitza » Wed Jul 04, 2012 12:45 am

hey guys,

ive got a used 5 in a 4 revtech tranny i recently installed and on the first ride with in a couple miles it kinda ate it.

i pushed in the clutch and it dropped the kicker arm straight to the ground while making some kind of ratcheting sound. towed the bike home, took the side cover off and discovered that ive got too much mainshaft thrust/side play. if i push the mainshaft towards the clutch, the starter gears start to drag, if i push it towards the right side of the bike, the starter gears spin freely again.

i dont have a manual or parts diagram for this tranny besides a crappy blurry one i found online. anyone have any idea's or if there are thrust washers in the tranny? ive never taken one apart but dont see it being a problem.

thanks ya'all



1950Panhead
Posts: 1578
Joined: Wed Jul 07, 2010 4:28 am
Bikes: 1950Panhead
Location: USA

Re: too much transmission mainshaft thrust?

#2

Post by 1950Panhead » Wed Jul 04, 2012 1:13 am

while making some kind of ratcheting sound
Something caused the ratching gears to engage, find out why and fix it.
On an oem tranny the spring holds the kick lever up, when you kick the kicker gear allows the ratching gears to engage.
Jerry

Huck
Posts: 637
Joined: Tue Mar 15, 2011 5:35 pm
Bikes: 58 hd
91 hd
09 custom
Location: Wake Forest NC

Re: too much transmission mainshaft thrust?

#3

Post by Huck » Wed Jul 04, 2012 2:29 am

Save yourself, pull it and try to forget it. Its not worth your effort.

awander
Site sponsor
Site sponsor
Posts: 1160
Joined: Fri Sep 21, 2007 3:03 am
Bikes: '52 FL
'64 FLH

Re: too much transmission mainshaft thrust?

#4

Post by awander » Wed Jul 04, 2012 4:33 am

Vitza:

I love your avatar.

flatboy1950
Posts: 409
Joined: Wed Dec 14, 2011 7:04 am
Bikes: 1948 Pan 61
1942 sv 74 x 4
1948 sv 74 x 1
1943 42U + sidecar with 6800 miles on the clock from new.
Location: South Africa

Re: too much transmission mainshaft thrust?

#5

Post by flatboy1950 » Wed Jul 04, 2012 9:32 am

There is a large nut & lockwasher that holds the mainshaft to the ball bearing. This ball bearing is a press fit in the case & held by a retaining plate.
If the mainshaft can move from side to side .... this nut must be loose. You need to remove the 2 pc. kicker ratchet to see the nut.

Regards , Flatboy.

vitza
Posts: 49
Joined: Fri Apr 15, 2011 10:51 am
Bikes: panhead project
Location: california

Re: too much transmission mainshaft thrust?

#6

Post by vitza » Wed Jul 04, 2012 5:07 pm

flatboy1950 wrote:There is a large nut & lockwasher that holds the mainshaft to the ball bearing. This ball bearing is a press fit in the case & held by a retaining plate.
If the mainshaft can move from side to side .... this nut must be loose. You need to remove the 2 pc. kicker ratchet to see the nut.

Regards , Flatboy.
thanks flatboy!!

the kicker ratchet you're referring to is the same as the "starter gears" that are in the kick start housing or a different part? can you explain where i can find it?

flatboy1950
Posts: 409
Joined: Wed Dec 14, 2011 7:04 am
Bikes: 1948 Pan 61
1942 sv 74 x 4
1948 sv 74 x 1
1943 42U + sidecar with 6800 miles on the clock from new.
Location: South Africa

Re: too much transmission mainshaft thrust?

#7

Post by flatboy1950 » Thu Jul 05, 2012 7:09 am

With the kickstart cover removed , you will see the kicker gear & its matching ratchet on the mainshaft. Clutch pushrod & thrust bearing should pull out.
The outboard ratchet part has a nut & lock washer holding it onto a taper that also has 1 or 2 keys. It should be very tight & needs a puller to get it off the taper.
The inboard gear should slide off the mainshaft , conical spring may come with it. You should then see a large nut & lock washer that hold the mainshaft to the ball bearing. This should be as tight as a nun , locking the mainshaft & ball bearing together.

Cheers , Flatboy.

RUBONE
Moderator
Posts: 4875
Joined: Sat Nov 15, 2008 4:09 am
Bikes: Multiple H-D, Ducati, BMW, Triumph, BSA,...

Re: too much transmission mainshaft thrust?

#8

Post by RUBONE » Thu Jul 05, 2012 1:24 pm

Vitza,
Be aware that your 5speed is different than Fatboy is telling you. He is describing a standard 4 speed set-up. The 5 speed has an inner cover that the shafts are bolted to. The kickstarter gears are a bolted on extension. It may have come loose internally, but it may also be a bad bearing on the mainshaft allowing the movement you are getting. I don't believe there is any 5 speed info in the document base here. Perhaps someone has a parts or assembly blowup for your Rev Tech tranny they can post.
Robbie

vitza
Posts: 49
Joined: Fri Apr 15, 2011 10:51 am
Bikes: panhead project
Location: california

Re: too much transmission mainshaft thrust?

#9

Post by vitza » Fri Jul 06, 2012 5:19 am

heya guys, figured everything out! looks like the nut thats behind the starter gears came loose. i tightened everything back up with loctite and looks like no more shaft thrust!

thanks everyone for the replies! much appreciated

flatboy1950
Posts: 409
Joined: Wed Dec 14, 2011 7:04 am
Bikes: 1948 Pan 61
1942 sv 74 x 4
1948 sv 74 x 1
1943 42U + sidecar with 6800 miles on the clock from new.
Location: South Africa

Re: too much transmission mainshaft thrust?

#10

Post by flatboy1950 » Sat Jul 07, 2012 7:30 am

I read 5 spd crammed into 4 spd case .....

Cheers , Flatboy.

Post Reply

Return to “Transmission, Starter & Shifting”