International Harvester 523 Overview
The International Harvester 523 is listed from 1965 through 1972 with a 179 cu in (2.9 L) direct-injection diesel rated at 52 hp. Its published drivetrain information includes an Agriomatic S partial power-shift entry and gear-count listings for 8 forward/4 reverse and 12 forward/4 reverse arrangements, so the installed transmission should be confirmed before service or parts work.
The 523 is listed with an independent 540-rpm rear PTO, 7.5 gpm (28.4 L/min) hydraulic pump flow, and a Category II/I rear hitch. Published weights range from 5,380 to 6,295 lb, reflecting different equipment; the individual tractor's front axle, wheel, and drive configuration matter when comparing dimensions or selecting parts.
The parts and service-literature routes below are useful starting points for the 523 family. Match the serial tag, transmission, and installed equipment before using a manual or ordering a component.
International Harvester 523 Quick Answers
- What engine is in an International Harvester 523?The 523 is listed with a 179 cu in (2.9 L) direct-injection diesel rated at 52 hp (38.8 kW) and 2,100 rpm.
- What transmission does the 523 have?Published 523 records identify an Agriomatic S partial power-shift transmission and list both 8-forward/4-reverse and 12-forward/4-reverse arrangements. Identify the fitted transmission before using a gear count, capacity, or parts reference.
- What PTO does the 523 use?The International Harvester 523 is listed with an independent rear PTO at 540 rpm with a 1.375-inch shaft. Verify the tractor's PTO equipment before matching an implement.
- What hydraulic figures are listed?Published specifications list 7.5 gpm (28.4 L/min) pump flow and a 4.3 gal (16.3 L) hydraulic-system capacity. Use matching service literature for fluid specifications and repair procedures.
- What are the listed fluid capacities?Published records list 18.5 gal (70.0 L) of fuel, 6.8 qt (6.4 L) of engine oil, and 16.3 qt (15.4 L) of coolant. A capacity is not a service procedure, so confirm the grade and fill steps in matching literature.
- Which documents are useful for a 523?The literature links include a 237-page parts-manual listing for International 523 and 624 tractors and a multi-model service-manual listing for 523/624/724/824 diesels. Check the serial number and installed transmission before using either one.
Engine and Power
The 523 is listed with a 179 cu in (2.9 L) direct-injection diesel rated at 2,100 rpm. Confirm the engine tag and installed equipment before applying engine-service information or parts coverage.
Diesel engine
| Displacement | 179 ci 2.9 L |
|---|---|
| Power | 52 hp 38.8 kW |
| Rated Rpm | 2100 |
| Engine Oil Capacity | 6.8 qts 6.4 L |
| Coolant Capacity | 16.3 qts 15.4 L |
Manufacture years
Engine
Transmission
Published 523 records identify an Agriomatic S partial power-shift transmission and show more than one gear-count arrangement. Check the transmission actually fitted to the tractor before using a capacity, procedure, or component reference.
8-speed transmission
| Gears | 8 forward and 4 reverse |
|---|---|
| Clutch | 279.4mm dry disc |
Agriomatic S
| Name | Agriomatic S |
|---|---|
| Type | partial power shift |
| Gears | 12 forward and 4 reverse |
PTO and Hitch
The International Harvester 523 is listed with an independent 540-rpm rear PTO and a 1.375-inch shaft. Confirm the PTO equipment before implement setup or diagnosis.
Rear PTO
Rear PTO type
Rear hitch
Rear lift
Hydraulics
Published data lists 7.5 gpm (28.4 L/min) pump flow and a 4.3 gal (16.3 L) hydraulic-system capacity. The tractor's installed remotes and condition remain the final check for a hydraulic repair.
Capacity
Pump flow
Fluids, Battery, and Service Facts
Published capacities include 18.5 gal (70.0 L) of fuel, 6.8 qt (6.4 L) of engine oil, and 16.3 qt (15.4 L) of coolant. Use configuration-matched service literature for grades, intervals, and filling procedures.
Fuel tank
Hydraulic system
Tires and Dimensions
Tire and dimension values can vary by wheel, axle, and configuration.
Wheelbase
Weight
Manuals and Documents
The linked 523/624 parts-manual listing is described as a 237-page English manual. The service-manual listing groups 523, 624, 724, and 824 diesel tractors, so it should be treated as a route for further research rather than proof that every procedure applies to every 523.
Before using either reference, record the serial number, transmission, PTO equipment, axle or drive arrangement, and hydraulic controls on the tractor.
Parts catalog
- International 523/624 parts manualparts matching
Commercial 237-page English parts-manual listing. Confirm the tractor before ordering.
View parts manual
Service manual
- International 523/624/724/824 service-manual listingoperation, maintenance, and specifications
Commercial multi-model diesel service-literature listing. Confirm exact tractor coverage before use.
View service-manual listing
Parts Checks Before Ordering
Record the serial number, engine, transmission, PTO, hydraulic controls, axle or drive arrangement, and wheel equipment before ordering. Published 523 records include transmission and weight differences that can affect the correct reference.
A parts book is an assembly-reference route, not proof of fitment. Confirm the actual tractor and the literature's stated coverage before ordering.
- International 523/624 parts manualCommercial 237-page parts-manual listing for the 523/624 family. Verify the tractor configuration before ordering.View parts manual
Accuracy Note
Tractor specifications can vary by year, region, factory configuration, installed equipment, and later repairs. Match serial range, engine, transmission, PTO setup, and model code before ordering parts or doing service work.