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Caterpillar Scraper Evolution

Maker:  Diecast Masters
Model No:  85563
Scale:  1:50
Review Date:  January 2021

Diecast Masters Index
Historic Equipment Index

Cranes Etc Model Rating
Packaging   (max 10) 10
Detail   (max 30) 24
Features   (max 20) 14
Quality   (max 25) 19
Price   (max 15) 11
Overall   (max 100) 78%


Caterpillar Scraper Evolution Video
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The outer sleeve.
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Excellent book.
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The No 70 scraper.
The 621K scraper.

This model set traces the history of Caterpillar Scrapers.  It includes models of the D7 Track-Type Tractor with the No 70 scraper, and the 621K Scraper.


The review set had no missing parts or defects.

A mini catalogue of the Diecast Masters range is included, and an instruction sheet for adding the operator and umbrella to the Cat D7.

The set includes a comprehensive 76 page ring-bound book.  It starts with a written history of scrapers, and there is a large photograph section.  There is also a comparison of machine specifications and it is pleasing that the book references other makers of scrapers, not just Caterpillar.  It is an excellent reference work to accompany the models.


The models are fixed to a base plate which has nice quality badges embedded.  The models are fixed by screws with stands, which are black and are visible to varying degrees. 

The D7 has nice metal tracks and the old fashioned spoked drive sprocket looks great.  At the rear there is a towing hitch and a large plastic winch arrangement. The ropes running from it to the scraper are modelled as soft plastic and it does not look so good.

The operator's area has replica levers and the operator which is in period clothing.   A plastic umbrella provides protection.

The engine block has a plastic engine which is detailed, and the exhaust pipe has a hole at the top.  At the front the radiator grille looks convincing and it has the Caterpillar name on top as well as couple of work lights.

The No 70 scraper has not be modelled before so there are some compromises presumably because of the lower volume production run. 

The wheels are good with nice tyres and the gooseneck is modelled well although the plastic riopes do not sit realistically.  Inside the bowl the apron is a plastic part and unfortunately it does not have a good colour match with the metal parts.  The Caterpillar graphics are very good.

The 621K's tyres are good and they are mounted on plastic wheels.

The tractor is detailed well, with some fine casting of textured areas.  The black grille at the front looks good and it has a Caterpillar logo.  The handrails are metal with various access ladders being plastic. 

The metal cab has good detail inside with nice controls including an offset steering wheel, and there is a Cat logo on the seat back. Small aerials and a horn are on the roof, together with a painted beacon light which does not look as good as a clear plastic version would.  There is a windscreen wiper on the front windscreen.

The connection to the bowl is very detailed with plenty of soft hoses, which all looks convincing.  The elevating mechanism for the bowl is also detailed with hydraulic hoses.  The bowl is metal with some nice graphics.

At the rear the anti-spill guard is modelled in metal, as is the robust pusher point at the back.  The handrails and laser sensor are soft plastic.


The models should be removable from the baseplate by undoing screws, but on the review set some screws were completely seized in position.  The models are fitted tight to the base so some wheels and tracks do not rotate freely.  On both models the steering appears functional although it can be moved whilst fixed. 

The D7 can be posed with or without an operator.

The No 70 scraper's apron can be raised and lowered easily, and the ejector can be moved but it is not smooth in operation.

On the 621K the apron raises and lowers and poses in any position.

The ejector can be moved forwards and backwards although it is a clunky mechanism.


The models are very good quality with nice paint and graphics, although there are some off-colour plastic parts.

The presentation of the set is excellent.


The set is reasonable value for two models and a reference book.


This set continues the Evolution Series and it provides a comprehensive history of this kind of machine.  In particular the book is a very interesting read for anyone interested in these machines.


The set first appeared in early 2022.

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Brochure reprints in the lid.
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The D7.
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The 621K..
Nice base plate presentation.