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giffenfarms 
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Joined: 31 Dec 2015
Location: Minesing
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 Topic: 840 payloader brakes
Posted: 23 Nov 2017 at 9:15pm |
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Hey guys, we have an 840 payloader with no brakes, this is our 3rd loader, with the same brake issues as the last 2 had.
What are people doing for brakes and where to find parts, we fixed the brakes last winter but are back to where we were, these aren't that popular of a loader around here and not too many people know how to work on them.
Any help in any direction would be appreciated.
Cheers,
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Coke-in-MN
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Joined: 12 Sep 2009
Location: Afton MN
Points: 41184
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Posted: 24 Nov 2017 at 10:34am |
Sounds like they are vacuum over hydraulic operation so the first thing to look at is vacuum booster in the system . Might look at changing it over the hydraulic booster like used on some diesel pickups has a old Pettybone 2 yard loader and chased brake problems on that - booster was the problem each time - it used a small vacuum pump that was belt driven and a small tank to help if and when you lost engine power to pump . Doing a search it seems 840 chatter is on the vacuum booster being at center of problems and finding a working unit is hard
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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Brad in WA
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Joined: 29 Sep 2009
Location: Lynden,WA
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Posted: 25 Nov 2017 at 12:40am |
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840's have a hydraulic booster, it gets oil from the power steering pump. I put a disc brake on mine, machined a plate and mounted it just ahead of the parking brake. Used a Chevy pickup caliper. Works great.
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giffenfarms
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Posted: 21 Dec 2017 at 5:31pm |
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Pulled everything apart, everything is in working order, puzzled, shoes are ok for being original, brake cylinder and booster both work
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DMiller
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Joined: 14 Sep 2009
Location: Hermann, Mo
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Posted: 21 Dec 2017 at 5:36pm |
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Air in system?
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giffenfarms
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Posted: 21 Dec 2017 at 6:36pm |
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giffenfarms
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Posted: 21 Dec 2017 at 6:45pm |
She's getting a complete check over, next on the list once we figure out the brake problem is to replace the center pivot pins, lots of movement 
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JohnCO
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Joined: 11 Sep 2009
Location: Niwot Colo
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Posted: 21 Dec 2017 at 9:13pm |
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What a beautiful shop you have! Sorry about that red tractor with the hood up...lol
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"If at first you don't succeed, get a bigger hammer"
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Coke-in-MN
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Posted: 21 Dec 2017 at 10:05pm |
Might look at using a hydraulic booster and master cylinder from a Chev Diesel pickup as they used power steering pump pressure - many machines use a accumulator to store hyd pressure to allow brakes to work if engine kills .
So could be you hyd pressure or the fact the booster isnt working
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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jerbob
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Joined: 07 Aug 2017
Location: Michigan
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Posted: 22 Dec 2017 at 11:02am |
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Can only see the floor and the lighting but that looks like a great shop.
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Adam Stratton
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Joined: 11 Sep 2009
Location: SW MO
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Posted: 30 Dec 2017 at 8:50am |
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I am impressed too! Can you give me some insight into what has to happen to pull the drums on that machine? I have an 840 that has leaking cylinders on the wheels. Does the drum come off simply after removing the wheel or do you have to take the big "hub" off too? Thanks in advance!
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giffenfarms
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Posted: 30 Dec 2017 at 12:08pm |
 Coke-in-MN wrote:
Might look at using a hydraulic booster and master cylinder from a Chev Diesel pickup as they used power steering pump pressure - many machines use a accumulator to store hyd pressure to allow brakes to work if engine kills .
So could be you hyd pressure or the fact the booster isnt working |
There is a booster on the pump, everything works when we pulled the drums off, which is the confusing part.
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giffenfarms
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Posted: 30 Dec 2017 at 12:22pm |
Adam Stratton wrote:
I am impressed too! Can you give me some insight into what has to happen to pull the drums on that machine? I have an 840 that has leaking cylinders on the wheels. Does the drum come off simply after removing the wheel or do you have to take the big "hub" off too? Thanks in advance! |
I'm doing a complete service on it and to check the cylinders and shoes, the drums come off by removing the 10 of 12 bolts on the hub, the pull out axle, there is a big nut that has to be removed with hammer/chisel, pull the bearing then the drum should come off, it's pretty straight forward. We're have the rear axle shoes sent away to be re-shoed, pop the rivers out and put new pads on.
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DMiller
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Joined: 14 Sep 2009
Location: Hermann, Mo
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Posted: 30 Dec 2017 at 1:01pm |
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Probably should check to see the booster is actually making 'Boost'. Could be internally gummed up or trashed out.
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