New 885 brake pads not fitting in drum

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Kent_885
Posts: 27
Joined: Wed Aug 16, 2017 4:53 pm
Location: Kent

New 885 brake pads not fitting in drum

Post by Kent_885 » Thu Apr 05, 2018 5:02 pm

Well pretty much everything I attempt either won't come off or in this case won't go back. I bought some new pads and rivets from davidbrownparts.com and drilled out the old rivets and pads and fitted the new ones no problem. The pads are very snug to the shoes with the copper rivets nice and tight.

All seemed good until I tried to slide the final drive/hub assembly back to the mounting only to find that the new width of the pads are now too wide to fit inside the drum. I phoned davidbrownparts and double checked I had the right pads but no amount of jiggling will allow me to get the final drive back in. I have removed the shoes and it slides back in no problem at all.

In discussing it with the supplier all we could come up with is to sand down the new pads. The ones that came off had wear left in them and were about 2.5mm and the new ones are 4.7mm. The extra 4.4mm combined is enough to be too tight for the drum.

Anyone else had this issue? Any advice greatly appreciated as I am off to the DIY shop to get some course sandpaper to wear down the new pads which seems a real pain!

tomryall
Posts: 160
Joined: Sun Jun 03, 2007 4:53 am
Location: canada

Re: New 885 brake pads not fitting in drum

Post by tomryall » Thu Apr 05, 2018 5:42 pm

have you slackened off the adjuster all the way back.

ALANJ
Posts: 65
Joined: Wed Oct 11, 2017 9:13 pm
Location: Co. Durham

Re: New 885 brake pads not fitting in drum

Post by ALANJ » Thu Apr 05, 2018 5:47 pm

I ,personally,would not recommend sanding down the pads as you describe . It will be virtually impossible to obtain a truly concentric finish which is essential.Sanding would leave high spots which would prevent full pad contact and thus less braking efficiency.If this supplier cannot provide dimensionally correct parts ,then you may wish to source elsewhere.
Before going down that road however, ensure the actuator is fully parallel with the flat shoe section.A partially seized actuator may be contributing to your problem.Good luck.AJK.

Kent_885
Posts: 27
Joined: Wed Aug 16, 2017 4:53 pm
Location: Kent

Re: New 885 brake pads not fitting in drum

Post by Kent_885 » Thu Apr 05, 2018 6:58 pm

The brake arm outside the drum is completely disconnected from everything and now moves freely and have looked really closely at the actuator and flat surfaces of the shoes to make sure there is no expansion of the shoes. It really does seem that the pads are just too thick but davidbrownparts is a specialist so hard to know if I went off to Agriline and similar if their pads would be any different. No supplier states the thickness dimension - just the shoe width and mine are correct for the width. I'm in a bind in that I need to get the tractor back together as I don't get many opportunities for the time to work on it.

After 12 hours at it today will have another look tomorrow. Am working uncovered so need luck with the weather.

ALANJ
Posts: 65
Joined: Wed Oct 11, 2017 9:13 pm
Location: Co. Durham

Re: New 885 brake pads not fitting in drum

Post by ALANJ » Thu Apr 05, 2018 7:13 pm

Why not stick with the old pads? 885,s are not hard on brakes .Just a practical thought.AJK.

Kent_885
Posts: 27
Joined: Wed Aug 16, 2017 4:53 pm
Location: Kent

Re: New 885 brake pads not fitting in drum

Post by Kent_885 » Thu Apr 05, 2018 7:44 pm

Really wish I’d not touched the old ones now. It seemed to be braking poorly on that side but at least they would fit. I damaged both with drilling out of the old rivets. Live and learn.

ALANJ
Posts: 65
Joined: Wed Oct 11, 2017 9:13 pm
Location: Co. Durham

Re: New 885 brake pads not fitting in drum

Post by ALANJ » Thu Apr 05, 2018 7:54 pm

A DB breaker then.At least you would know the parts will fit.Just a thought.AJK.

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db2d
Posts: 2198
Joined: Fri Feb 24, 2012 10:01 pm
Location: Monmouthshire

Re: New 885 brake pads not fitting in drum

Post by db2d » Thu Apr 05, 2018 9:06 pm

This is the first complaint I have become aware of regarding the thickness of the brake linings. I suggest contacting DB Parts and ask for a replacement set from an alternative source.

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dbiow
Posts: 77
Joined: Sat Apr 30, 2016 4:20 pm
Location: Isle of Wight

Re: New 885 brake pads not fitting in drum

Post by dbiow » Thu Apr 05, 2018 9:12 pm

Check the drum hasn’t got a lip worn on the edge, I’ve seen that stop drums going back on on other machines before now
885 q cab and 25d on the Isle of Wight.

Berk
Posts: 83
Joined: Wed Nov 22, 2017 5:41 pm
Location: Carmarthenshire

Re: New 885 brake pads not fitting in drum

Post by Berk » Fri Apr 06, 2018 12:49 am

I would be very, very hesitant to sand the friction material.

Often contains asbestos and the like, so would be what I'd consider a unreasonable risk.

Would suggest taking lots of photos and putting it to the hive mind, sometimes you can't see the wood for the trees in these things.

Not sure if there's specs for the brake drum thickness?possible potential to turn them to give you the needed clearance.

Kent_885
Posts: 27
Joined: Wed Aug 16, 2017 4:53 pm
Location: Kent

Re: New 885 brake pads not fitting in drum

Post by Kent_885 » Fri Apr 06, 2018 7:37 am

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I've attached photos. The old pad next to the new pad on the shoe. You can see it's a lot thicker but I was expecting that for new versus old with lots of wear. Also a close up of the pad jamming up on the drum as I try to slide the unit back. Also the unit slid back in without the shoes on - I have it sitting on a dolly I made up for the job.

Thanks for all the help. Will double, treble check everything again but pretty certain the pad thickness is the issue. Will look for a worm lip on the edge of the drum as well
Attachments
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DB780
Posts: 1641
Joined: Fri Dec 30, 2005 4:06 pm
Location: Lincolnshire

Re: New 885 brake pads not fitting in drum

Post by DB780 » Fri Apr 06, 2018 8:59 am

I am sure you will have checked this but the outer lip of the drum, where the brake shoes don't contact, can get heavily rusted over the years. This often needs to be removed before the new shoes will fit.

Kent_885
Posts: 27
Joined: Wed Aug 16, 2017 4:53 pm
Location: Kent

Re: New 885 brake pads not fitting in drum

Post by Kent_885 » Fri Apr 06, 2018 9:35 am

Had a really good look at the situation this morning and started by measuring the distance from the casing rim to the inner surface of the
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Distance of casing rim to hub inner surface
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hub (which I checked for no lip or build up of rust or dirt) and then put the shoe on with totally neural position of the actuator and the distances were pretty much identical So that means that the drum and shoes would be totally snug and if I was able to force the hub over them then I would just get total binding of the shoes in the drum. As I have a set of pads for the other side that I don't need now as they are clearly the wrong thickness I put a sanding disc on my angle grinder and sanded them down using the old pad as a guide. Sure enough with a couple of mm sanded off the unit slips back in but still has quite small movement of the brake arm to bind.
Attaching photos showing the sanded down one versus the new untouched one and can see that it's a big difference. I will need to go back to the supplier and find a set that are right - although it's hard to really know what the 'proper' dimension should be.

Thanks for all the help - if anyone has an 885 and ordered new pads recently I'd love to know how thick they are - mine were about 4.7mm which is way too thick it seems.
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Brake shoe to rim
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Sanded down shoe now fits
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Sanded shoe versus new
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Lofty
Posts: 221
Joined: Fri Dec 23, 2016 5:04 pm
Location: South Australia

Re: New 885 brake pads not fitting in drum

Post by Lofty » Fri Apr 06, 2018 12:54 pm

Would it be possible to ‘fine-tune’ the actuator to allow the shoes to retract a little more? I mean modify it slightly.

Kent_885
Posts: 27
Joined: Wed Aug 16, 2017 4:53 pm
Location: Kent

Re: New 885 brake pads not fitting in drum

Post by Kent_885 » Fri Apr 06, 2018 2:03 pm

I did briefly consider working on the actuator or shoes but didn't want to dig a deeper hole if I messed up - and it would have been altering expensive parts for the sake of some fairly cheap pads. The sanded down ones are now in place and it brakes pretty well so will do until I can get some proper replacements although it's not a simple job to just strip off all the mudguard metalwork.

A real life saver was the dolly I made for myself - turns a 3 person job (2 to hold the final drive in place and 1 to rotate the wheel hub to engage the spline. I was able to just slip the final drive in and out and never lose alignment with the dowels.

The amount of ins and outs I needed to keep seeing if the shoes would fit would have been a total nightmare without it. Even a hoist would be more difficult with the swinging around

Here's a picture. Wheels on the bottom and ran smoothly on plywood. Adjustable top shelf to fine tune. Anyone thinking of trying to get the finals drives off without a hoist and/or 2 fit mates I would highly recommend knocking one up. I can provide all the details.
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Dolly for final drive
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