doug72 Posted February 8, 2015 Posted February 8, 2015 (edited) Having built the 42030 Volvo Wheeled Loader and “B” model from spare parts I was not satisfied with the dump body not being able to hold anything due to the big gaps in the construction. Also disappointed with the dump body drive unit gear crunching when raising & lowering the dump body. Following the the theme on subtractor units I decided to strip the B model down and re-build as a Tracked Dump Truck using a subtracter drive unit to power it via a PF receiver. The dump body is raised and lowered by a PF switch operated by turning one of the a cab uprights. (the one with the black 12T bevel gear) The subtractor unit was made as compact as possible and it took three re-builds before I was satisfied with the chassis, track units and dump body unit. The subtractor unit has a XL motor which drive both tracks via a a two stage reduction of 4.66:1 - the steering is driven by an M motor to give slow turns when XL motor running or turns on the spot when M motor only running. Dump body is raised and lowered by an L motor via 3:1 reduction with a 24T clutch gear to protect the drive and has ample power to do this. PF Receiver / PF switch and battery box are hidden inside the engine housing next to the cab. battery switched on & off by the lever in front of drivers seat I build on a build it and see if it works / looks OK basis, if not rebuild. and try again it took several attempts before happy with the result, so no instructions. This is my first large MOC and pleased with the result. See photos on my Flicka page: https://www.flickr.c...57650692142512/ Edited February 8, 2015 by Doug72 Quote
5imon Posted February 10, 2015 Posted February 10, 2015 Intetesting work! Is it based on a real vehicle? I've never seen something like it before. Quote
Electro Posted February 10, 2015 Posted February 10, 2015 Intetesting work! Is it based on a real vehicle? I've never seen something like it before. Yes, tracked dumpers have been around for years. I own a small one myself. Quote
doug72 Posted February 10, 2015 Author Posted February 10, 2015 (edited) Its loosly based on a Hitachi CG70 tracked dump truck. I have added pphotos to my Flicka page. https://www.flickr.c...57650692142512/ Lego made a small "B" model 8294 which has a rotating body, i.e. cab and dump body rotate on the chassis togerther - manually operated. It would be a real challenge to sqeeze all the drives into a fully remote PF model. Need to order some more 5 x 11L yellow panels and connectors to make the dump body more uniform and a better shape. I made the model using parts I had available from older lego models. One problem has been matching yellow componants due "50 shades of yellow" from Lego over the years !!!! Edited February 10, 2015 by Doug72 Quote
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