I believe a skilled operator should understand there machine and all its adjustments.
This is a BK95 by this time the screws were hydraulic but still a skilled job (just less physical)
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widget wrote:Hello all,
Here are some more diagrams to mull over which might interest some of you.
The last diagram shows a built up fixed screed which I think would have measured 24ft.
You can see the the various types of extension boxes available which are bolted together, the larger 2ft ones could also have burners on if required. (Note the burners on this screed are fueled by diesel) I could be asked to change the width of the screed several times a day on some jobs if cut off shoes were not practical.(This was a very laborious task sometimes, a loader and lifting chains were used if available).
The diagram shows various components, the drive motors, drive shafts, carrier bearings and V belts for the tampers etc. Some of these parts needed greasing or oiling at regular intervals during the day, you would constantly be checking fuel and hydraulic pipes for leaks and fireboxes for cracks and loose bolts. This was time consuming but better than a failure with a thousand tons in front of you!.( I used to get an extra 2 hours pay per day for this task, that showed the importance i think!)
All the various turnbuckles are shown (but not the shims in between the boxes) which would be used to set the screed up in conjunction with a good straightedge to lay the perfect mat, they're not just for support when in the raised position.
When the day was finished you would switch off the the burners but leave the fans running to keep a constant air flow whilst the screed was cooling down, you were best to leave the tampers running with screed in the raised position for a while( usually whilst you where cleaning the rest of the machine down) so the bitumen that had got in between the tampers and the tampershields would drip out and then you would wash it down with diesel.
Care had to be taken on how you supported the screed when you parked the machine up after the shift because of distortion whilst it was cooling down, so you would use blocks at intervals along the sole plates (like shown in the diagram) , you would never rest it straight onto the ground.
Most Pavor drivers didn't get much spare time, if you weren't laying, you would be maintaining to minimize breakdowns etc, we could get very possessive of our machines because of the work we put into them
Hutch wrote:still have nightmares about fitting those 3/4 metre extension boxes.those prop shafts connecting to the main screed were a right pain to fit either you had to sand the shaft to get it to slide on or the key would drop out as you slide it on.Even though the tamper frame had holes in it for bolts you never bolted the 3/4 extension to the main screed, one gang done this and snapped the bearing housing on the extension tamper and after this fitting 3/4 boxes became a fitters job.When we done a screed overhaul my old boss would try to have us shim the extensions to the nearest thou and weld packers to the top bolt holes to force the extensions down as the screed frame had distorted. In his mind near enough was never good enough.The extensions would then have the machine number and fitting order welded to them.Building up a wide screed could take a day as once you had fitted the extensions you then had all the auger extensions, baffles and bracing to fit.Even extending screeds still need boxes fitting on wider jobs having fitted two 250mm ones to a Vogele screed last night and still seem fiddly with bolts in akward places and cams to set the sole plate to the main screed.
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