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Caterpillar 798 AC Mining Truck

Maker:  Diecast Masters
Model No:  85671
Scale:  1:50
Review Date:  January 2022

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 798 AC Mining Truck Video
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Large Caterpillar branded tin.
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Steering angle is less than the real truck.
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Very detailed chassis.
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Detailed wheels are plastic.
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Stairs and ladder lowered.
Opening doors on both sides.
Excellent mesh grille.  Weigh load inidcator.
Two stage rams.
Being loaded.

The Caterpillar 798 AC Mining Truck has a payload of 372 Metric tonnes.  It is used for large quarry operations.


The model comes in high quality 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 2021 mini brochure of the Diecast Masters range is included, as is an instruction sheet for installing the operator.


This is a large heavy model weighing around 3.4kg.

The chassis construction is heavy with very good detailing.  There are some plastic parts with an excellent colour match.  Many cables and pipes are modelled and they replicate the complexity of a real machine.  Also modelled is a ladder inside one of the front wheels.

The large wheels are plastic and detailed and the tyres have a realistic matt finish with a tread pattern. 

The front of the truck has an impressive radiator grille and the access stairs and ladders are plastic, but the handrails are metal and realistically thin.  There are two separate wheel chocks.  The level of detail throughout is high.

The cab deck is textured with a non-slip surface and there is an impressive cabinet with highlighted grilles and handles.  The radial grid on the right hand side has very nice metal mesh.  There are digital load indicators on both sides.  The cab is metal and the seats and controls are visible, and an operator can be installed.  The Cat logo is printed on the seat backs.  Large mirrors on each side of the truck are plastic.

Between the wheels are large tanks which are modelled in plastic with enhanced detail, and with an excellent colour match.  Below the dump body the top of the chassis also has many details with various tanks and pipes modelled.  Two large two-stage hydraulic pistons lift the dump body, with the middle stage being light grey plastic which does not look so good.  Large soft mud flaps look good.

The dump body is a large metal casting.  Sharp graphics are applied and lifting eyes are formed.

At the rear end a couple of bars hang down between the rear pairs of tyres to clear out trapped material and a safety cable is 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 limited compared to the real machine. 

The rear axle suspension works well.

At the front the access stairs at the bottom fold down to enable an operator to board the truck.  A ladder on the opposite can be folded down.

There are three opening gates at the top of the ladder and stairs.

The dump body tilts well to a decent angle and the cylinders are stiff enough to hold the body at any angle.

On the cab deck an access flap can be opened to enable the engine to be seen. The cab has opening doors on each side. 

The operator can be installed, or left out.


It is a high quality model with significant metal content and appropriate use of plastic.

The paint is very good and the graphics are sharp.


It is a very large model which is relatively pricey.


This is a very impressive model of a large Caterpillar mining truck.  It is robustly made with very nice details and most of the functionality is to a high stanadard too.


The model was released in January 2022.

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Parts out of the box.
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Imposing appearance.
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Very detailed underneath.
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Excellent rear axle.
Profile view.
Opening engine cover.
Reasonable tipping angle.
Travelling loaded.
Pairs well with the largets mining shovels.