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Cat385 Hydr & Elec1

On this page you can see the build of the hydraulics and electronics in the Cat 385 C LREBecause I don't have much experiance with hydraulics,I will buy the cylinders,and pumps from Benjamin Modelbouw Ede.Link:

02 April 2013:Today I got the cylinders from Benjamin Modelbouw Ede.

Above the cylinders,2 for the boom,1 for the stick,and 1 for the bucket.20 June 2012:To make it possible that the upper part of the excavator can swing continuesly,there has to be a feed-trough of the power lines that drives the motors for the tracks.Underneath you can see my solution and the way I made it.

Left you see the centre tube off brass,wich gives strength to the plastic isolation part.Right you see the rings ready,on the inside there is going to be the cable soldered,in the little pocket that you can see,and the isolation rings that comes between the brass rings.

Left you see the center spill placed on the chassis.Right you see the screws covered with a isolation ring,this also give the first brass ring a little hight.

Left you see that the rings are locked with a nut with Mf 8 thread on it.Right you see that in the nut is placed an axle,on wich the roller bearings will come for the rotating part.

Left you see the cables soldered to the rings.Right you see the assembly of the ring to the spill.

Left you can see the rotating part,in the transparent plastic are coming the brushes which are going to push against the brass rings to make the contact.In front you can see one of the brushes.

Left you can see the wiring of the rotating part with copper wire,isolated with shrink tube.Right you can see the pockets that are made in the rotating part,inside the pockets there are made little holes,where the springs are glued in.

Left you can see the size of the feed-trough unit,comparing to the sigaret lighter.Right you see a close-up of the unit.

Left you see the brushes soldered to the copper wires.Right you see the rotating part assembled to the spill,and the working is tested while rotating the rotating part.

Left you can see the unit sitting inside of the swing bearing,and clearly is that there is not much space left.Right you can see the little gears inside the toothed ring,they are going to drive the upper carriage with two electro motors.12 September 2013:

16 Oktober 2013:

Left you can see a little hour counter,bought at,wich is going to be placed in the excavator,so the working hours of the machine can be recorded,and I now when the hydraulic oil needs to be changed.

03 Oktober 2013:

Today I got the fittings for the hydraulic hoses.They where also made by Benjamin Modelbouw.On the side of the nut comes the hose,on the other side comes the brass tube,which can be soldered on to the fitting.

Left you can see the parts ready,and mounted on the cover between the A- frames.Right you can see the tubes that are connected to the front,they run under the cover to the back,where the pumps and valves are going to be placed.13 December 2013:After the tracks,again a little serial work:

Left you can see on the background a picture of the real machine,where the hoses of the boom lift cylinders come together on a "rail like" system,so the cylinders can be operated simultaneously.Of course I like to make it in the same way on my model,on the picture you can see the parts that I made for it,ready to be soldered togther,on the end of the tubes there is also made thread on it,Metric fine 4 mm.

Left you can see the clamps and studs that are going to support the hydraulic tubes on the boom.Right you can see the M2 bolts in place,and they are to long,so have to be cut of a bit.

Left you can see the studs and clamps mounted,in the middle of the stud is a countersunk M2 bolt,that can't be seen anymore after bolting the clamp.Right you can see the clamps on the boom.

Left you can see the start of making some 90 degree elbows,in one side there is thread to assemble the hose connector,on the other side a hole is drilled, to solder the tube in place.Right you can see the elbow after turning the flat surfaces round.

Left you can see the making of the dummy tube connectors.

Left you can see the elbows after final grinding and filing.Right you can see how the hydraulics look on the real machine.

Left you can see the elbows and the tube connectors soldered in place.Right you can see that the elbows are on a angle with the boom,just like on the real machine.


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