Cropmaster 30C brake job

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cobbadog
Posts: 299
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Location: beautiful Coopernook NSW. near Taree. NSW. Australia

Re: Cropmaster 30C brake job

Post by cobbadog » Tue Feb 06, 2018 5:09 am

Brake linings arrived today but the rivets only suit the short holes. So I have done the run about on the phone with no results for brake lining rivets locally but one bloke offered an idea that will work. Buy some aluminium rod and make my own solid rivets. So tomorrow when I head into town I will pick up some aluminium rod and start making. Apparently solid aluminium rivets will do the job quite well and are safe going by the brake man. For what ever reason the bag of rivets supplied with these linings sent enough to do a fleet of tractors so I will be right the next time I need to do some brake shoes. :lol: :roll:
While in town I will pick up the extra oil seals for the opposite side and just maybe the speedi-sleeves might be in as well.
To throw a spanner in the works and progress of the tractor a new replacement mower base has arrived as well and this is very high on the lists of things that MUST be done ASAP as it will be a mower for Rallies and will be bright pink in colour for my wife.

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cobbadog
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Re: Cropmaster 30C brake job

Post by cobbadog » Sat Feb 17, 2018 5:39 am

Finally I had time to make the aluminium rivets for the shoes and I made them 25mm (1") long. I used the standard copper rivets in the middle holes and I actually drilled the extra holes to have 8 rivets hold the lining on each shoe. I did a trial run with the made rivet and when you compress the shank by hammering down while the head sat on a mandrel it really did pull up tight, so I am very happy with the result. Next stage is start reassembly on this side and fit the speedi-sleeves to the main axle and finish off this side and then start on the other.
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cobbadog
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Re: Cropmaster 30C brake job

Post by cobbadog » Thu Feb 22, 2018 5:03 am

Got the first side all back together again and have done a rough brake adjustment until I get both sides finished. When I pulled the stub axle out this is what I found, a metal ring with a chamfer on it. No wonder this side leaked oil from the reduction box. At least I do have a proeper oil seal to replace it with.

Any clues as to what it is suppose to be ?
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cobbadog
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Re: Cropmaster 30C brake job

Post by cobbadog » Sun Mar 04, 2018 5:03 am

Separated the reduction box from the diff today and found that the drain hole on this side was also blocked and it was holding water as well. I have now idea where the water has come from but it is what it is. I have a lot of cleaning up to do before doing the linings and re assembly.
Does anyone know what that round metal part is that was behind the stub axle which has the wheel flange? It has a bevel on it that was facing outwards and sat against the stub axle bearing.

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db2d
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Re: Cropmaster 30C brake job

Post by db2d » Sun Mar 04, 2018 9:34 am

I believe the part is the collar that the final drive shaft oil seal contacts with.
A felt seal can be fitted in the chamfered section that will be compressed when the ring nut is tightened.
The collar often leaks oil and becomes loose if the ring nut is not tightened using the correct ‘C’ spanner.

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cobbadog
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Re: Cropmaster 30C brake job

Post by cobbadog » Mon Mar 05, 2018 3:28 am

Thanks db2d. That is what it looks like it is. Its just it didn't separate on the opposite side and so this was a surprise when it showed up. Below is the mess I found when I finally dropped the reduction box off. I never knew about the drain holes at the bottom of the brake housing area. I certainly do know and the same as the grease nipple on the stub axle housing. That one was well hidden.
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cobbadog
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Re: Cropmaster 30C brake job

Post by cobbadog » Mon Mar 05, 2018 3:33 am

Linings are muddy but no oil leaks.
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cobbadog
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Re: Cropmaster 30C brake job

Post by cobbadog » Tue Mar 27, 2018 6:52 am

Made a small amount of progress again yesterday. 2 seals fitted for the main axle, a speedi sleeve fitted on that axle and newlinings fitted and shoes in place.
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cobbadog
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Re: Cropmaster 30C brake job

Post by cobbadog » Tue Mar 27, 2018 6:57 am

Had to really compress this pic a lot more for some reason so detail may be lost. Maybe tomorrow I can then lift the reduction box back into position and bolt it up and start re-assembly of the reduction gear and fit the new seal in place on the stub axle.
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cobbadog
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Re: Cropmaster 30C brake job

Post by cobbadog » Fri Mar 30, 2018 5:47 am

Here we go with a mystery.
I relined the shoes the same way as the other side. Assembled the shoes to the diff and the cam is at rest meaning that the shoes are as close together as they can be and at the moment there is no rod on the arm to adjust the brakes up or down so the shoes are backed off as far as they can be.
I lift the reduction box into place and feed it over the brake drum and I can use a lever to turn the pinion gear on the end of the main axle. But as I continue to push the reduction box towards the diff the axle locks up. When I get the housing to about 1/2" away from being against the diff this is where it gets tight to turn the pinion. I slip the housing off and see a mark on the brake shoe so I use a smooth file and take a small amount of lining off at that point and push the housing back in and the same thing happens. Even as the housing gets to that 1/2" gap I can get an old brake shoe adjusting tool inside and rock the shoes so it seems that they are not touching the drum.

Any thoughts?

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cobbadog
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Re: Cropmaster 30C brake job

Post by cobbadog » Sun Apr 01, 2018 12:27 am

Here are 2 photos of the issue.
In the top photo you can see the 2 suds at the top of the housing are just protruding through the holes. At this point the axle cannot be turned using my 3' long pry bar on the pinion gear inside the reduction box.
In the bottom photo I can turn the pinion gear with the pry bar and I also can use the old car brake adjusting tool to wobble the brake shoes top and bottom. There is less than a 1/4" difference in the position of the housing as can be seen looking at the 2 studs again and the gap in the housings.

What can it be binding up on to cause the problem?
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locked up
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db2d
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Re: Cropmaster 30C brake job

Post by db2d » Sun Apr 01, 2018 7:55 am

Does the axle seal housing pass over the spur pinion shaft after the fitting of sleeves ?

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cobbadog
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Re: Cropmaster 30C brake job

Post by cobbadog » Mon Apr 02, 2018 12:19 am

Yes the speedi sleeve fits past the seals easily as it did on the opposite side. I am not sure but today I will check that the brake drum has not moved and needs to be seated towards the outside edge. Although I did not remove the brake drum on this side as it did not do anything to help me other than explore what is behind it so I left this side in place. The opposite side took a LOT of struggling to get the drum off and I just would not think that this side would have moved. Will find out later today.

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cobbadog
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Re: Cropmaster 30C brake job

Post by cobbadog » Wed Apr 04, 2018 5:52 am

REJOYCE !

Today it went back together and the pinion is turning as it should. I tried putting a dab of grease on the pivot and cam of the brakes and fitted the housing until it locked the pinion then removed the housing and no transfer of grease so that is not the problem. I once again looked inside to see if any gears had dropped out of place causing it to lock up but all was clear. Lastly I had another go at pulling the housing in with the bolts. My first try was to the point that I thought I would strip the threads it was that tight and it was not pulling up at all. Today however it locked up as usual and then I just kept doing up the bolts again and waiting for it to get tight again and it didn't happen until both housings were touching.
Tomorrow I will assemble the bull gear, spacer, lock tab and nut then fit the rear cover and fill with oil and put the rear wheel back in place.

Y I P P E E ! :lol:

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Lofty
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Re: Cropmaster 30C brake job

Post by Lofty » Wed Apr 04, 2018 8:43 am

Well done Cobba.

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