V8Druid
do it as well as you can,but learn to do it better
I'd be saying spring applied - hyd release from what I recall of what Mick said
Mick-the-fitter
It’s what I do!
Sprung on hydraulic off,
S
Steve Tivey
Member
Removing the brakes makes perfect sense, brill ideaSprung on hydraulic off,
Ground relatively level, I guess speed is controllable by Revs?
How do we dismantle the brakes and do we cap off the hydralics
Steve
Mick-the-fitter
It’s what I do!
Like I explained get two long bolts the same thread as the bolts holding the covers on the hubs put two nuts on them wind them against the plates front and hubs, take all the other bolts out wind the nuts off slowly, they will leak a bit of oil, take out the brake packs, put the covers back and cap the hoses, if there is still pressure issue we can loop the tow valve out to tank, let me know!
S
Steve Tivey
Member
My committee are concerned about taking off the brakes as there are often small kids about when I am working.
Is there any way of testing the tow block valve? If this was faulty would it divert oil back to the tank rather than make pressure?
When I took off the brake pipes with the engine running the hydraulics has a steady but gentle stream, cant imagine enough to operate anything certainly not high pressure.
V8Druid
do it as well as you can,but learn to do it better
like @Mick-the-fitter said ... refurb the tow valve block
Mick-the-fitter
It’s what I do!
You will get flow when the engine is running, the tow valve may have an internal leak, which means rather than make pressure at the brake hubs it will leak back to tank! Ok take a hose off the steering ram either end, join it with a tee into the two brake hoses at the tow valve/ red and green cable ties, if you can blank the tow valve, start the engine and turn the steering one way or the other, the roller will turn one way but take the brakes off in the other direction, turn the steering wheel to the brakes off and try and drive at the same time. Photos please
S
Steve Tivey
Member
Hi Mick
Having a go this weekend.
However I am confused.
If the brakes were On or Stuck On when the machine was asked to drive would the engine not pull down?
Where does the fluid from the brake release go, does it form some kind of circuit or signal to the drive
Tried in the week and with the engine on, block in Tow position when drive selected the engine was pulled down immediately
Moved Tow block to drive and tried to move engine just revved no resistance at all
Having a go this weekend.
However I am confused.
If the brakes were On or Stuck On when the machine was asked to drive would the engine not pull down?
Where does the fluid from the brake release go, does it form some kind of circuit or signal to the drive
Tried in the week and with the engine on, block in Tow position when drive selected the engine was pulled down immediately
Moved Tow block to drive and tried to move engine just revved no resistance at all
I
IvorT
Member
did you check there is no muck between drum and chassis / frame ?
S
Steve Tivey
Member
I
IvorT
Member
it would prevent the drum from turning so would act like a brake on thus pulling down the engine.
we've had both terex and bomag and the terex had less clearance than the bomag so even a small amount of muck can act like a brake.
we now have a bomag as the clearance is much greater.
we used to use a road pin to clear the s**t out that built up on use particularly on soil or damp muck or wet mot
S
Steve Tivey
Member
Hi MickYou will get flow when the engine is running, the tow valve may have an internal leak, which means rather than make pressure at the brake hubs it will leak back to tank! Ok take a hose off the steering ram either end, join it with a tee into the two brake hoses at the tow valve/ red and green cable ties, if you can blank the tow valve, start the engine and turn the steering one way or the other, the roller will turn one way but take the brakes off in the other direction, turn the steering wheel to the brakes off and try and drive at the same time. Photos please
Tried that ( see photos) no difference
Attachments
Mick-the-fitter
It’s what I do!
Ok next! On the brake hubs are large nuts in the centre, can you remove one and take photos for us!
S
Steve Tivey
Member
Attachments
Mick-the-fitter
It’s what I do!
As I remember! There is a thread inside, that when using a large washer and bolt or threaded bar M16 I think! And a nut you can thread the bolt in through the washer and wind the nut down the bolt pulling the brakes off! Do back and front, then see if you can drive the roller?
Just a question? was there an issue with before you had it refurbished?
Just a question? was there an issue with before you had it refurbished?
S
Steve Tivey
Member
S
Steve Tivey
Member
We were using the roller when suddenly we lost drive. no deterioration just no drive
When we rev the engine it does just that the engine does not pull down which would suggest stuck brakes or jammed wheels
So the bolt goes through the hole and screws into a thread in the machine, the washer rests on the outer plate, then a nut pulls something towards it releasing the brakes???
Is this with the previous steering ram instructions or should I rebuild that?
When we rev the engine it does just that the engine does not pull down which would suggest stuck brakes or jammed wheels
So the bolt goes through the hole and screws into a thread in the machine, the washer rests on the outer plate, then a nut pulls something towards it releasing the brakes???
Is this with the previous steering ram instructions or should I rebuild that?
Mick-the-fitter
It’s what I do!
Put everything back to standard, wind the brakes off like I have sudgested with the studying or long bolts and nuts and washers
S
Steve Tivey
Member
Mick the Fitter and others
Can I thanks everyone for their help and precious time.
In a pub conversation, I was introduced to one of John Deere`s top engineers.
He came and had a look and within 10 mins she was rolling.
The problem was/is the front drive pump is broken, however both drives are linked so all pressure was going back to the tank. This link was broken and the rear wheel drives.
Thrilled
We don't know why or what is broken so if you have any ideas where I might find a replacement.
Thanks again
Steve
Can I thanks everyone for their help and precious time.
In a pub conversation, I was introduced to one of John Deere`s top engineers.
He came and had a look and within 10 mins she was rolling.
The problem was/is the front drive pump is broken, however both drives are linked so all pressure was going back to the tank. This link was broken and the rear wheel drives.
Thrilled
We don't know why or what is broken so if you have any ideas where I might find a replacement.
Thanks again
Steve
Mick-the-fitter
It’s what I do!
A good result, if oil is going back to tank! The drive motors are in series so I would suggest the drive coupling is broken between motor and drum!
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