thwaites brake drum clutch

Discuss dumpers here

Topic author
poirot
Posts: 1
Joined: Thu Oct 10, 2013 5:08 pm
Real name: chris allen

thwaites brake drum clutch

Post #1 by poirot » Sat Oct 12, 2013 6:07 pm

Hi all, new bloke here with a nice little thwaites dumper that I recently discovered has a brake drum for a clutch (which after I spent some time thinking about it is quite a nifty idea) Owever, it is currently a slipping clutch, not too badly yet, will still drive just cant manage an incline with a load in the skip. I've spent a while scrolling through the various posts but cant find any clear idea as to how to go about adjusting it or stripping it down for a more in depth repair; the square adjuster nut seems to be seized so the strip down may be necessary anyway; I'd just like a few pointers so I don't get that big spring and the attached metal smacking me in the nose ( i do know enough not to put my nose in front of it) Is there any scope to just adjust the shoes up and get a few more months out of it, or do I need the whole strip down; any assistance gratefully received

Poirot.


essexpete
Posts: 4059
Joined: Fri Jul 13, 2007 12:43 am
Real name: essexpete
Has thanked: 849 times
Been thanked: 680 times

Re: thwaites brake drum clutch

Post #2 by essexpete » Sun Oct 13, 2013 11:46 am

The little Thwaites dumper (30+ yrs ago) is about the only gearbox that I have stripped completely but oddly never had to replace anything in the clutch drum. Sounds like you will have to strip it to free it up. IIRR you can pull it off as a complete unit and work on it on the bench. If the shoes are not worn but glazed you might get away with a clean/fine emery. Be careful with the dust as it might well contain asbestos.

User avatar

Tillywolves
Posts: 313
Joined: Mon Sep 30, 2013 9:48 pm
Real name: Richard
Location: Stafford
Has thanked: 17 times
Been thanked: 29 times
Flag: Great Britain

Re: thwaites brake drum clutch

Post #3 by Tillywolves » Sun Mar 30, 2014 11:14 am

Is there a service guide to this, as I need to do a strip down as well. Are the internal springs, and retaining clips, holding the shoes in place, also off the shelf Triumph Herald parts.

User avatar

Tillywolves
Posts: 313
Joined: Mon Sep 30, 2013 9:48 pm
Real name: Richard
Location: Stafford
Has thanked: 17 times
Been thanked: 29 times
Flag: Great Britain

Re: thwaites brake drum clutch

Post #4 by Tillywolves » Sun Mar 30, 2014 8:33 pm

Is your drum clutch like mine ?

Image

Image


Colinb
Posts: 1
Joined: Sat Jan 16, 2016 7:44 pm
Real name: Colin brett
Flag: Great Britain

Re: thwaites brake drum clutch

Post #5 by Colinb » Sun Feb 28, 2016 5:16 pm

I happened upon this schematic recently hope it's of use to somebody

Image


SiH
Posts: 140
Joined: Sat May 02, 2015 10:27 pm
Real name: Simon
Has thanked: 105 times
Been thanked: 5 times
Flag: France

Re: thwaites brake drum clutch

Post #6 by SiH » Fri Mar 04, 2016 2:31 pm

My thwaites dumper clutch is slipping in high gears too. It's a 4wd,artic steer,mk3, 2 tonnes apparently,( there's a pic of it on my post 'What is this?'). The clutch drum looks a lot deeper/wider on mine than the one above. Mines been stood out for over 5 or more years,so hopefully it might be rust covering that's causing it to slip. Anyone done one?


Jeremy Rowland
Moderator
Posts: 8667
Joined: Sun Aug 05, 2007 8:36 pm
Real name: Jeremy Rowland
Has thanked: 1867 times
Been thanked: 1688 times

Re: thwaites brake drum clutch

Post #7 by Jeremy Rowland » Fri Mar 04, 2016 3:07 pm

SiH wrote:My thwaites dumper clutch is slipping in high gears too. It's a 4wd,artic steer,mk3, 2 tonnes apparently,( there's a pic of it on my post 'What is this?'). The clutch drum looks a lot deeper/wider on mine than the one above. Mines been stood out for over 5 or more years,so hopefully it might be rust covering that's causing it to slip. Anyone done one?



Simon rust would not cause a clutch to slip if you look at the top photo above the square for the 'notes' I have typed 'this is the adjuster' and it is very similar to a car brake adjuster(probably square); you screw the adjuster in until the drum cannot be freely turned then back it off slowly until the drum just rotates freely, the clutch should then be adjusted correctly.
The adjusters do rust and seize so it may take some freeing off; try and adjust it and see how you get on, trial and error is probably the best way, if after adjustment the clutch slips them it may well need new linings in which case you will need to strip it and get the brake/clutch shoes repaired, there are plenty of companies around who can do this for you.

Jeremy


SiH
Posts: 140
Joined: Sat May 02, 2015 10:27 pm
Real name: Simon
Has thanked: 105 times
Been thanked: 5 times
Flag: France

Re: thwaites brake drum clutch

Post #8 by SiH » Sat Mar 05, 2016 10:08 am

Thanks for that Jeremy- I haven't even got underneath to have a look at it yet in the few weeks since I bought it. Good to hear it sounds so simple though,even if I do need to strip it all in the end. I do like these old machines for there practicality to work on. :rockon:

User avatar

FOWLER MAN
Posts: 2358
Joined: Wed Dec 09, 2009 11:28 pm
Real name: fred evans
Has thanked: 1295 times
Been thanked: 1111 times
Flag: Wales

Re: thwaites brake drum clutch

Post #9 by FOWLER MAN » Sun Mar 06, 2016 8:43 pm

Hi Simon,
When you adjust the clutch get someone to sit on the dumper and depress the pedal to fully release the clutch then hold it down.
Tighten the square on the adjuster all the way till it's tight, slack it back about two flats, (enough to free the drum), then release the pedal and hopefully all should be well.
Fred


SiH
Posts: 140
Joined: Sat May 02, 2015 10:27 pm
Real name: Simon
Has thanked: 105 times
Been thanked: 5 times
Flag: France

Re: thwaites brake drum clutch

Post #10 by SiH » Mon Mar 07, 2016 10:06 pm

Cheers Fred! That's brilliant-sounds just the job. I'll get on and do that soon. :)


Return to “Dumpers”

Who is online

Users browsing this forum: No registered users and 18 guests