Tractor · 1929Unverified
John Deere GPWT
John Deere GPWT — Two-Cylinder Letter Series · 10 hp. Reference specifications; pending source verification.
Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.
Rated power
10 hp
Hover a source tag to verify
Overview
ManufacturerJohn DeereReference
Row-Crop tractorReference
Built in Waterloo, Iowa, USAReference
The John Deere GP Wide Tread (GPWT) was tricycle-front version of the model GP tractor, with a wide rear axle. There were 203 model GPWT tractors converted to a narrower, 68-inch, rear tread for use in potato fields of the US Northeast. The last 443 GPWT tractors were built with "overhead steering", with a shaft running over the top of the hood in a style similar to the later Model A tractor. The first overhead-steer GPWT was serial number was serial number 404810.Reference
Two-wheel driveReference
SteeringmanualReference
Open operator station with steel pan seat.Reference
Variants
GP-Ppotato, with 68-inch treadReference
Engine
John Deere 5.1L 2-cyl keroseneReference
John Deere 5.6L 2-cyl keroseneReference
Fuel tank60.6 LReference
Aux. fuel7.6 LReference
Drawbar (claimed)7.5 kWReference
Belt (claimed)14.9 kWReference
Plows2 (14-inch)Reference
John DeereReference
keroseneReference
2-cylinderReference
liquid-cooledReference
Original engine, used until 1930. Water-injection system was used to prevent detonation ("knocking") with low quality fuels. All GP-P tractors used the 5.75-inch bore engine.Reference
Displacement5.1 LReference
Bore/Stroke146 x 152 mmReference
Air cleaneroil bathReference
Rated RPM900Reference
Coolant capacity34.1 LReference
Introduced at S/N 402040 in July of 1930. The new engine had a larger bore with lower compression. It had slightly more power with better fuel economy. The lower compression eliminated the pre-ignition problem when using low-quality fuel, so the water-injection system was eliminated.Reference
Displacement5.6 LReference
Bore/Stroke152 x 152 mmReference
Rated RPM950Reference
Transmission
3-speed unsynchronized gearReference
TransmissionJohn DeereReference
Typeunsynchronized gearReference
Gears3 forward and 1 reverseReference
Clutchdry discReference
PTO & Hydraulics
Rear PTO Type520Reference
Dimensions
Wheelbase199 cmReference
Front tire24x6Reference
Rear tire44x10Reference
Ag front24x6 (steel)Reference
Ag front24x4 (GP-P)Reference
Ag rear44x10 (steel)Reference
Ag rear44x8 (GP-P)Reference
Length298 cmReference
GP-P Length300 cmReference
Width217 cmReference
GP-P Width193 cmReference
Height (hood)147 cmReference
Rear axle63 mmReference
Rear tread193 cmReference
Rear tread172 cmReference
GPWT Serial Number Location
Below gear shift leverReference
GPWT Serial Numbers
1929400000Reference
1930400936Reference
1931402741Reference
1932404770Reference
1933405110Reference
Final405254Reference
19305000 (GP-P)Reference
Final5202 (GP-P)Reference
FAQ: How to read a serial number table.Reference
Capacities
Diameter33 cmReference
Width16 cmReference
RPM950Reference
Speed975.36 meters/minReference
Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.