Oliver OC-12

The Oliver OC-12 is a tractor produced by Oliver. It is equipped with a 298 ci 4.9 L engine. The listed engine power is Gasoline (listed): 63 hp / 47.0 kW; Diesel (listed): 61.5 hp / 45.9 kW. Transmission: 4 forward and 2 reverse. Drive type: crawler. Operating weight: 10925 lbs (diesel) 4955 kg.

Overview

	1955 - 1960 Agricultural Crawler tractor

Production
Manufacturer	Oliver
Agricultural Crawler tractor
Built in Cleveland, Ohio, USA

Variants
OC-12	crawler
OC-126	crawler-loader

Oliver OC-12 Transmission
4-speed gear
Transmission details ...

Oliver OC-12 Power
Engine	63 hp 47.0 kW
Drawbar (claimed)	53 hp 39.5 kW
Belt (claimed)	59 hp 44.0 kW
Drawbar (tested)	50.83 hp 37.9 kW
Belt (tested)	57.93 hp 43.2 kW
Performance test details ...

Mechanical
Drive	crawler
Open operator station.

Dimensions & Tracks
Weight	10925 lbs 4955 kg
14-inch tracks
Full dimensions and tracks ...

References
New OC-12 Diesel Crawler with Power-Turn Steering published in 1955, by Oliver
OC-12 Diesel Crawler published in 1956, by Oliver
OC-12 Power-Turn Diesel Crawler published in 1958, by Oliver
OC-12 Crawler Tractor published in 1959, by Oliver

Engine

Engine options
Hercules 5.6L 6-cyl gasoline
Hercules 4.9L 6-cyl diesel

Engine Detail — 339 ci / 5.6 L Gasoline

Manufacturer	Hercules JXLD
Fuel Type	Gasoline
Configuration	6-cylinder, liquid-cooled vertical L-head
vertical L-head
Displacement	339 ci 5.6 L
Bore/Stroke	4.00x4.50 inches 102 x 114 mm
Power	63 hp 47.0 kW
Compression	6.25:1
Rated RPM	1750
Starter volts	6
Coolant capacity	24 qts 22.7 L

Engine Detail — 298 ci / 4.9 L Diesel

Manufacturer	Hercules DJXC
Fuel Type	Diesel
Configuration	6-cylinder, liquid-cooled vertical I-head
Displacement	298 ci 4.9 L
Bore/Stroke	3.75x4.50 inches 95 x 114 mm
Power	61.5 hp 45.9 kW
Compression	15.5:1
Rated RPM	1750
Starter volts	12
Oil capacity	12 qts 11.4 L
Coolant capacity	20 qts 18.9 L

Oliver OC-12 Engine

Transmission

Transmission — 4 forward and 2 reverse gear

Type	gear
Gears	4 forward and 2 reverse
Oil capacity	32 qts 30.3 L

Dimensions

Oliver OC-12 Tracks
4-roller width	14 inches 35 cm
4-roller length on ground	67.75 inches 172 cm
4-roller area on ground	1897 in² 1.2 m²
5-roller width	14 inches 35 cm
5-roller length on ground	71.5 inches 181 cm
5-roller area on ground	2002 in² 1.3 m²

Dimensions
Length	109.75 inches 278 cm
Width	58 inches (44 gauge) 147 cm
	76 inches (60 gauge) 193 cm
Height	66.5 inches 168 cm
Weight	10925 lbs (diesel) 4955 kg
Ground clearance	14.1 inches 35 cm
Gauge	44 inches 111 cm
Gauge	60 inches 152 cm

Tests

Tractor Tests
NTTL 548: gasoline 4-speed crawler
NTTL 549: diesel 4-speed crawler

Nebraska Tractor Test 548
Gasoline 4-speed crawler June 15 - 28, 1955 Link: Nebraska Tractor Test 548 file
Belt power (max)	57.93 hp 43.2 kW
Belt fuel use (max)	6.0 gal/hour 22.7 l/hour
Drawbar performance
Max power	50.83 hp 37.9 kW
Gear 2 used for power test.
Max pull	10399 lbs 4716 kg
Gear 1 used for pull test.

Nebraska Tractor Test 549
Diesel 4-speed crawler June 15 - 28, 1955 Link: Nebraska Tractor Test 549 file
Belt power (max)	56.55 hp 42.2 kW
Belt fuel use (max)	4.8 gal/hour 18.2 l/hour
Drawbar performance
Max power	50.54 hp 37.7 kW
Gear 2 used for power test.
Max pull	11333 lbs 5140 kg
Gear 1 used for pull test.

Photos

Oliver OC-12