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JCB Construction Sets

JCB market some metal construction sets, featuring some of their machines under their own brand name. These use Eitech Construction type metric parts with 10mm hole spacing. These construction sets can be classified as Polylong(1a) type sets.

Manufacturer / Distributor

Imported from China by (Smart Fox) Koch Media, Reading, UK

Info from the Metal Constructional Systems Database for POLYLONG [1a] (Ref:PLY1a)

System Type
2004 to in production in 2022 and continuing
Boss Type
push fit
Boss Thread
Diametrical Pitch of Gears
25 (see comment *1)
No. of Parts in System
50 (approximately)
Hole Pitch (Spacing) (mm)
Diameter of holes in Strips(mm)
4.2 (see comment *2)
Diameter of the Bore in Bosses(mm)
Diameter of Axle Rods(mm)
Types of Nuts and Bolts
Nuts: hexagonal
Bolts: pan (crosshead)
Material/Finish of Nuts and Bolts
Steel with a Bright Zinc plated finish
Size of the Nuts across Flats (mm)
Bolt diameter (mm)
6.5(see comment *3)

Various Sets (see separate list) from one or more unknown Chinese makers. Most parts as Eitech/Construction but some others. *1 Mod.1 & finer for Motor/Gear Unit.. *2 Square holes in some RCEE sets. *3 6.1 & 7.4 also reported.

Pages from the 'Other Systems Newsletter' which contain information on this system are shown below. They can also be downloaded to your computer if desired here

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The report can be zoomed into, made full screen or downloaded as a pdf document by using the controls provided

Below there are manuals/instructions which can be downloaded by clicking on the appropriate image.

The instruction leaflet for the JCB set - Backhoe Loader GT.

Photos of the JCB set - Backhoe Loader GT.
(Added 02/07/2020)

The instruction leaflet for the JCB set - Tracker Excavator.
(Added 02/07/2020)

Photos of the JCB set - Tracker Excavator.
(Added 02/07/2020)

Photos of the JCB set - Articulated Truck (from the internet).
(Added 02/07/2020)