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Caterpillar 797F Tier 4 Mining Truck

Maker:  Diecast Masters
Model No:  85655
Scale:  1:50
Review Date:  September 2020

Diecast Masters Index
Mining Equipment Index

Cranes Etc Model Rating
Packaging   (max 10) 9
Detail   (max 30) 27
Features   (max 20) 16
Quality   (max 25) 21
Price   (max 15) 9
Overall   (max 100) 82%


Caterpillar 797F Tier 4 Mining Truck Video  [Youku video]
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Large Caterpillar branded tin.
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Chassis is detailed.
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Steering angle is moderate,
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Rear axle detail is excellent.
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Two stage hoist rams.
Excellent tipping angle.
Being loaded by a Caterpillar 994..

The Caterpillar 797F Tier 4 Mining Truck has a payload of 400 US tons.  It is used for large quarry operations.


The model comes in the usual exemplary packaging.  There is an outer shipping carton which contains a tin which is protected by expanded polystyrene trays.  The tin is high quality and includes pictures and details about the real machine.

The review model had no defects or missing parts. 

A 2019 mini brochure of the Diecast Masters range is included.


This is a large heavy model weighing around 3.5kg.

The chassis construction is heavy with some nice detailing.  The drive train is replicated and there are various cables and pipes modelled. The steering cylinders are also replicated Some of the detailed modelling is in plastic, including the engine block, but the colour match is very good. 

The large wheels are detailed with tiny nut details.  The tyres are particularly nice with a realistic matt finish and a detailed tread pattern. 

The front of the truck has a plastic radiator grille and the access stairs and ladders are plastic, but the handrails are metal and realistically thin.  There are two towing points and wheel chocks.  Many smaller details such as lights enhance the appearance.

The cab deck is fully textured to resemble a non-slip walking route and there is a detailed exhaust treatment system.  The cab is metal with grab rails, and lifting eyes on the roof.  Inside, the seats and controls are visible, and an operator is permanently installed.  There is a load indicator on the side of the cab showing '400' to represent 400 US tons. Large mirrors on each side of the truck are plastic.

Between the wheels are large boxes and tanks which are modelled in plastic but with an excellent colour match.  Highlighting improves the detailing.  Below the dump body the top of the chassis also has many details with various tanks and pipes modelled, including some connectors.  Two large two-stage hydraulic pistons lift the dump body, with the centre stage being grey plastic.

The dump body is a large metal casting with some plastic elements but the colour match is very good so it hardly notices.  Sharp graphics are along the edges.

At the rear end a couple of bars hang down between the rear pairs of tyres to clear out trapped material and a pair of safety cables which are used to hold the dump body upright during servicing are modelled.  The detailing at the back is excellent including detailed graphics on the suspension cylinders and intricate highlighting of the rear axle.


The front wheels steer although the range of movement is less than the real truck achieves. 

The rear axle suspension works.

The dump body tilts well to an excellent angle which may even exceeds the real truck, and the cylinders are stiff enough to hold the body at any angle.

At the front the access stairs at the bottom fold down to enable an operator to board the truck. 

On the cab deck two access flaps can be opened to enable the engine to be seen. The engine has more highlighted detailing.


It is a very good quality model with a high metal content.

The paint is very good and the graphics are sharp.


It is a very large model which is fully priced.


It has been many years for an upgraded 797 to appear, and this model has had a focus on improved detailing.  It is very impressive model which is excellently packaged.


The model was announced at the Nuremberg Toy Fair in 2020 and was released in August 2020.

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Impressive detailed front.
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Access stair can be lowered.
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Detail equipment box.
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Nice matt finish on the tyres.
Profile view.
Opening engine covers.
In the mine.
Poses well with other models.