780 brake drum

The place to discuss all matters relating to David Brown Tractors. You will need to register your user name before you can post. If you have already registered could you please make sure that your location details have been completed. Go to My Account in the Main Menu on the left, and then go into "Edit Your Information" and complete your location details. Give the Country (and State/Province if you wish) if outside the U.K. County if within the U.K. Location details helps other members if you need spares, technical advice, or the nearest practical help.

DISCLAIMER -

David Brown Tractor Club Ltd
Forum/website Disclaimer

1. This [forum/website/chat room] and the advice and opinions expressed herein is not a solution for mechanical, electrical, valuations, other problems, breakdowns or issues experienced in relation to the vehicles referenced.

2. If reliance is thought to be placed on any of the information guidance or input provided such information will be expressly confirmed as appropriate to be relied upon.

3. In the absence of any such confirmation no reliance should be suggested or inferred.

4. Members must not disclose information to 3rd parties in anticipation that reliance will be given by non-members.

5. Non-members must not purport to give advice on behalf of David Brown Tractor Club.

6. If you or someone you know is experiencing difficulties or repeated breakdowns you must seek assistance for an appropriately qualified expert who holds themselves out as such.

7. Any comments are free of charge and made or posted on an ex gratia basis. No member or non-member may advertise their professional services

Any user inactive for more than 3 months will automatically be deactivated, please contact admin@dbtc.co.uk if you would like to be reactivated.

Please be aware that your user name and entered location can be seen by all members. We only store information you have entered which is your email address and username, your IP is also stored, we have no access to private passwords.

If you do not agree with your information being stored, please do not register an account, If you wish to unsubscribe at any time please email admin@dbtc.co.uk giving your username.

Amended 27/10/18

Moderators: Segrie61, admin

Post Reply
User avatar
bengentry6
Posts: 22
Joined: Sat May 13, 2017 7:18 pm
Location: essex/suffolk

780 brake drum

Post by bengentry6 » Sun May 17, 2020 11:01 am

Hi All,

After finally getting round to changing the brakes on my 780, I took the final reductions off to discover that the left hand brake pads weren't actually worn down but the oil seal had broken, allowing oil to fill the brake drum, shown in the photo.

So the next job is to remove the brake drum to replace the oil seal behind it which I understand can be a tricky task without a proper puller.

I have a rough idea of how to make a puller, but before I do that, is there anyone on here that has made one previously that might be able to lend it to me for a short period of time? Or has any tips on making one?

Thanks
Webp.net-resizeimage (2).jpg
Webp.net-resizeimage (2).jpg (238.69 KiB) Viewed 97 times

User avatar
cobbadog
Posts: 830
Joined: Tue Oct 11, 2011 6:18 am
Location: beautiful Coopernook NSW. near Taree. NSW. Australia

Re: 780 brake drum

Post by cobbadog » Sun May 17, 2020 12:49 pm

The good news is that you dont have to remove the brake drum from the axle. Buy a new set of linings so that you can start with good dry linings. Some just use brake kleen product but for the coat of new linings and 30 minutes work replace them and you will also find that the new linings are softer than the old linings and will grip far better. I made my puller/s to do this job and I was advised to buy a pair of new seals to put in place as there is room for 2 seals and will sit on a new surface for a better seal. I went one step further and bought speedi-seals for the axle surface so that it has a brand new surface to run on. The final thing you need to remove to get the old seal out is some BSF bolts, 1/4" I think from memory and wind them into that cover. The cover that is removed can stay off to allow room for the 2 seals. I also put speedi-sleeves on the half shafts in the reduction box along with new seals and then I did the other side. Now when unloading the tractor from Lorry the truck I can easily control the speed at which the tractor rolls down the ramps with these new linings.

Did you strip down the reduction box or remove the housing as a complete unit?

Also be carefull on re-assembly. One side of mine went straight back together with no issues but the other side would engage the axle into the diff centre and then slide almost all the way in then lock up. I had this side in and out at least 20 times before it finally went all the way in. Why this happened I have no idea so be patient.

User avatar
ollek
Posts: 4073
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: 780 brake drum

Post by ollek » Sun May 17, 2020 1:17 pm

Here we are again, compering an 30C with a Selectamatic. If the oil leak is from the rear axle, then you change the two seals per side in the rear axle. The seals are in seal housings. ALL Implematic and Selectamatic tractors have two seals per side in this location from the factory. The one seal system is ONLY in tractors older than Implematic. If the leak is from the wheel reduction, then you have to remove the brake drum. The following link shows the seal setup in the rear axle and the seal housing ref 38 has to be removed before the seals, ref 39 can be changed https://partstore.caseih.com/us/parts-s ... 03ar490594 and the following link is for the wheel reduction and the seal is ref 4 https://partstore.caseih.com/us/parts-s ... 03ar256244 The following link takes you to the complete workshop manual for your tractor, just select the section you need https://drive.google.com/drive/folders/ ... Dh6M2k0bVk Section K TRANSMISSION is about the wheel reduction and the rear axle seal. Important! If you remove the right hand side wheel reduction, press the diff lock pedal fully down and tighten the pedal in this position before you remove teh unite. If not done, then the diff lock sleve and spring vill drop down into the rear axle.

Post Reply

Who is online

Users browsing this forum: No registered users and 7 guests