John Deere 4320 (1971 – 1972)

John Deere 4320
Production Years1971 – 1972
SeriesNew Generation Series
TypeRow-Crop tractor
Production Details
ManufacturerJohn Deere
FactoryWaterloo, Iowa, USA
Total Built21,485
Original Price (1972)$12,000
PTO (Claimed)115 hp (85.8 kW)
Drawbar (Tested)101.7 hp (75.8 kW)
PTO (Tested)116.55 hp (86.9 kW)
Engine Details
ManufacturerJohn Deere
Fuel TypeTurbocharged diesel
Displacement404 ci (6.6 L)
Bore/Stroke4.25×4.75 inches (108 x 121 mm)
Fuel Consumption7.953 gal/hour (30.1 l/hour)
Air CleanerPaper elements
Compression Ratio15.7:1
Rated RPM2200
Idle RPM800-2200
Operating RPM1500-2200
Firing Order1-5-3-6-2-4
Starter Volts12
Oil Capacity16 qts (15.1 L)
Coolant Capacity28 qts (26.5 L)
TransmissionJohn Deere Syncro-Range
TypePartially synchronized
Gears8 forward and 2 reverse
Clutch13.5-inch dry disc
Oil Capacity56 qts (53.0 L)
Fuel Capacity44 gal (166.5 L)
Hydraulic System Capacity14 gal (53.0 L)
TypeClosed center
Capacity14 gal (53.0 L)
Valves1 to 3
Pump Flow22 gpm (83.3 lpm)
Tractor Hitch
Rear TypeII
Rear Lift Capacity3750 lbs (1701 kg)
Power Take-off (PTO)
Rear PTOIndependent
Rear RPM540/1000
Serial Numbers
Ag Front10.00-16
Ag Rear18.4-34
Ag Front (Single Front)11.00-12, 7.50-15, 7.50-16, 7.50-18, 11L-15, 11.2-24 (4WD), 12.4-24 (4WD)
Ag Rear15.5-38, 16.9-38, 18.4-38, 23.1-30, 20.8-34, 13.6-38 (duals), 15.5-38 (duals), 16.9-38 (duals), 18.4-34 (duals)
Wheelbase106.5 inches (270 cm)
Length159.3 inches (404 cm)
Width89.6 inches (227 cm), 95.9 inches (243 cm – long axle), 103.9 inches (263 cm – extra long axle), 113 inches (287 cm – dual axle)
Height107 inches (271 cm)
Height (Steering Wheel)81.4 inches (206 cm)
Clearance (Front Axle)24.5 inches (62 cm – adjustable), 21 inches (53 cm – standard)
Clearance (Rear Axle)27.8 inches (70 cm), 26 inches (66 cm – rear housing)
Clearance (Drawbar)15 inches (38 cm)
Rear Axle Diameter3.375 inches (85 mm)
Front Tread (Tricycle)10.7 to 15.8 inches (27 to 40 cm)
Front Tread (Standard)55.5 to 60.8 inches (140 to 154 cm)
Front Tread (Wide)64 to 82 inches (162 to 208 cm – 4WD)
Front Tread (4WD)70 to 88 inches (177 to 223 cm)
Front Tread (4WD Wide)60 to 91 inches (152 to 231 cm – cast wheels)
Front Tread (4WD Offset)60 to 96 inches (152 to 243 cm – offset wheels)
Front Tread (4WD Long Axle)60 to 97 inches (152 to 246 cm)
Front Tread (4WD Offset Long Axle)60 to 102 inches (152 to 259 cm)
Front Tread (4WD Extra Long Axle)67 to 105 inches (170 to 266 cm)
Front Tread (4WD Offset Long Axle)60 to 110 inches (152 to 279 cm)
Front Tread (4WD Dual Axle)66 to 115 inches (167 to 292 cm)
Front Tread (4WD Offset Dual Axle)60 to 120 inches (152 to 304 cm)
Shipping Weight9,050 lbs (4105 kg)
Operating Weight10,675 lbs (4842 kg)
Ballasted Weight14,380 lbs (6522 kg)
John Deere 148 Loader
Loader Weight1350 lbs (612 kg)
Height (to Pin)126 inches (320 cm)
Clearance, Dumped Bucket102 inches (259 cm)
Dump Reach32 inches (81 cm)
Dump Angle38°
Clearance, Level Bucket121 inches (307 cm)
Rollback Angle11°
Breakout Force (Lift)4700 lbs (2131 kg)
Lift to Full Height (at Pin)3100 lbs (1406 kg)
Bucket Capacity0.5 cu yd (0.4 cu m), 0.6 cu yd (0.5 cu m), 0.8 cu yd (0.6 cu m), 0.9 cu yd (0.7 cu m)
Bucket Width60 inches (152 cm), 72 inches (182 cm), 84 inches (213 cm), 96 inches (243 cm)
John Deere 158 Loader
Loader Weight1771 lbs (803 kg)
Height (to Pin)156 inches (396 cm)
Clearance, Dumped Bucket132 inches (335 cm)
Dump Reach32 inches (81 cm)
Dump Angle37°
Clearance, Level Bucket151 inches (383 cm)
Rollback Angle12°
Breakout Force (Lift)5000 lbs (2268 kg)
Lift to Full Height (at Pin)3800 lbs (1723 kg)
Bucket Capacity0.5 cu yd (0.4 cu m), 0.6 cu yd (0.5 cu m), 0.8 cu yd (0.6 cu m), 0.9 cu yd (0.7 cu m)
Bucket Width60 inches (152 cm), 72 inches (182 cm), 84 inches (213 cm), 96 inches (243 cm)
John Deere 4320 Overview

The John Deere 4320, a key member of the New Generation Series, is a renowned row-crop tractor with a strong presence in the agricultural landscape of the early 1970s. Here’s a comprehensive evaluation of this tractor:


Engine: The 4320 boasts a turbocharged 6-cylinder diesel engine with 404 cubic inches (6.6 liters) of displacement, producing a robust 115 horsepower at the power take-off (PTO).
Transmission: It features a partially synchronized transmission with 8 forward and 2 reverse gears, complemented by a 13.5-inch dry disc clutch.
Fuel and Hydraulics: With a 44-gallon fuel tank and a 14-gallon closed-center hydraulic system, the 4320 can efficiently power hydraulic attachments with a pump flow of 22 gallons per minute.


Powerful Engine: The turbocharged engine provides substantial horsepower, making it suitable for a wide range of agricultural tasks.
Versatility: Its compatibility with various attachments and configurations, including loader attachments, makes it a versatile choice for different farming operations.
Fuel Efficiency: Despite its power, the 4320 maintains a reasonable fuel consumption rate, contributing to cost-effective operation.
Reliability: John Deere’s reputation for reliability and durability is upheld in this model, ensuring longevity and low maintenance costs.


Synchronization: The transmission, while robust, is only partially synchronized, which may require more skillful operation compared to fully synchronized transmissions.
Weight: At an operating weight of over 10,000 lbs, it can be challenging to maneuver on softer ground or smaller fields.
Age: Given its production years, finding replacement parts for older 4320 models may become increasingly difficult.

Common Problems:

Engine Issues: Over time, the turbocharger or engine components may require maintenance or replacement.
Transmission Wear: The transmission may experience wear and tear, potentially leading to gear-shifting problems.
Hydraulic Leaks: Hydraulic systems can develop leaks that require attention.
Electrical Problems: Wiring and electrical components may deteriorate with age.

Safety Features:

Operator Presence System: Ensures the engine and drivetrain halt when the operator leaves the seat.
Safety Switches: Various safety switches prevent operation if certain conditions, such as an open hood or disengaged PTO, are not met.
Rollover Protection Structure (ROPS): Although not always standard in older models, ROPS can be added for rollover protection.

Other Features:

Wheelbase and Dimensions: The tractor’s wheelbase and various dimension options allow customization to suit specific farming needs and field conditions.
Loader Compatibility: The 4320’s ability to accommodate loader attachments like the John Deere 148 and 158 loaders enhances its functionality for tasks beyond traditional row-crop farming.
Steering Options: Depending on the specific model and configuration, the tractor may offer options such as power steering for operator comfort.

In summary, the John Deere 4320 is a classic row-crop tractor known for its power, versatility, and reliability. While it has its limitations due to its age and partially synchronized transmission, it remains a valuable asset on farms, particularly when paired with loader attachments. Farmers appreciate its ability to handle various tasks efficiently, making it a trusted companion for a range of agricultural operations.

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