John Deere 4620
The John Deere 4620 is a high-powered agricultural tractor produced from 1971 to 1972, with a total of 6,928 units manufactured. It features a six-cylinder turbocharged and intercooled diesel engine with a displacement of 6.6 liters (6,637 cm³), delivering a maximum power output of 135 horsepower at 2,200 RPM. Its torque and power make it well-suited for heavy-duty farming tasks.
The tractor is equipped with two transmission options: the Syncro-Range with eight forward and two reverse gears or the Powershift with eight forward and four reverse gears. These transmissions provide versatility for various field operations, allowing speeds ranging from 2.8 to 29.7 km/h. The rear Power Take-Off (PTO) operates at 1,000 RPM, enhancing its compatibility with a wide range of implements.
The John Deere 4620 adopts a closed-center hydraulic system with a capacity of up to 18 gallons (68 liters), depending on the transmission type. It supports Category III/II rear hitches and offers an independent PTO system, making it efficient for pulling and powering equipment. The tractor’s hydrostatic power steering and hydraulic wet disc brakes ensure smooth handling and reliable stopping power.
In terms of dimensions, the 4620 has a wheelbase of 106.5 inches (270 cm) and weighs between 12,980 and 14,930 pounds, depending on the configuration. Its overall length is approximately 170.7 inches (433 cm), with a width of 95.8 inches (243 cm). The fuel tank holds up to 50 gallons (189 liters), providing extended operational time in the field.
The open operator station was standard, but options included a two-post Roll-Gard ROPS or an enclosed cab for added safety and comfort. The John Deere 4620 remains valued for its robust performance and reliability in agricultural applications.
John Deere 4620 Specs
The 4620 features a John Deere 6.6L 6-cylinder diesel engine with intercooler and turbocharger. It has a displacement of 404 cubic inches (6.6 liters) with a bore and stroke of 4.25 x 4.75 inches (108 x 121 mm). The engine operates at 2200 rated RPM and produces a claimed PTO power of 135 hp (100.7 kW). In tests, it achieved 135.76 hp (101.2 kW) at the PTO and 115.75 hp (86.3 kW) at the drawbar.
Two transmission options were available:
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Syncro-Range: 8 forward and 2 reverse speeds, partially synchronized
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Power Shift: 8 forward and 4 reverse speeds, full power shift
The 4620 uses a closed-center hydraulic system with a capacity of 16 gallons (60.6 L) for Syncro-Range models and 18 gallons (68.1 L) for Power Shift models. It features a Category III/II rear hitch and an independent rear PTO operating at 1000 RPM.
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Wheelbase: 106.5 inches (270 cm)
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Length: 170.7 inches (433 cm)
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Width: 95.8 to 118 inches (243 to 299 cm), depending on axle configuration
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Height: 106 inches (269 cm)
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Weight: 12,980 to 14,930 pounds (5,887 to 6,772 kg) operating weight
The fuel tank holds 50 gallons (189.3 L).
Standard tire sizes:
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Front: 9.50-20 or 11.00-16
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Rear: 20.8-38
Various other tire options were available, including dual rear tires.
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Hydrostatic power steering
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Hydraulic wet disc brakes
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Differential lock
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Open operator station with optional two-post Roll-Gard ROPS and canopy or enclosed cab
The John Deere 4620 was known for its robust performance and reliability, making it a popular choice for heavy-duty farming operations of its time.
John Deere 4620 Prices
The John Deere 4620 was originally sold for approximately $15,000 to $18,000 when new in the early 1970s. Adjusted for inflation, this would equate to around $100,000 or more in today’s dollars, depending on configuration and optional features.
Used prices for the John Deere 4620 vary widely based on factors such as condition, hours of use, location, and included features. Current market prices in the United States are generally as follows:
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: Around $10,000 for tractors with high hours or requiring significant maintenance.
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: $15,000 to $20,000 for well-maintained units with moderate hours and functional components.
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: Up to $25,000 or more for tractors in excellent condition with low hours and additional equipment like dual tires or rebuilt components.
These values reflect the tractor’s enduring popularity and robust performance in agricultural applications.
Websites specializing in farm machinery sales often list John Deere 4620 tractors. These platforms provide detailed specifications, images, and pricing for both private sellers and dealers. Examples include farm equipment marketplaces, auction platforms, and classified ad websites.
Auction platforms frequently feature used John Deere 4620 tractors. These sites allow you to view past sale prices and upcoming listings, providing an excellent reference for market trends.
Authorized John Deere dealerships or independent farm equipment dealers can provide information on used inventory. They often inspect and refurbish equipment, ensuring quality and reliability.
Local newspapers, farm magazines, and community boards may list John Deere 4620 tractors for sale. These sources can help you find nearby sellers.
Agricultural expos or trade shows sometimes feature used machinery sales. Attending these events allows you to inspect tractors in person.
Certain websites focus exclusively on tractors and their parts. These platforms often have pricing data for specific models like the John Deere 4620.
John Deere 4620 Parts
The John Deere 4620 tractor has a wide range of available parts for maintenance, repair, and restoration. These parts cover various components of the tractor, including the engine, transmission, hydraulics, and body.
The 4620 is equipped with a John Deere 6404T or 6404A engine. Parts available for these engines include:
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Pistons and piston rings
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Connecting rod bolts
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Main and rod bearings
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Camshaft bearings
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Valvetrain components
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Gasket sets (including head gaskets and oil pan gaskets)
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Fuel pumps and injection system parts
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Engine rebuild kits
Parts for the transmission and drivetrain include:
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Gears and shafts
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Clutch components
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Differential parts
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Axle components
The hydraulic system parts include:
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Pumps
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Valves
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Hoses and fittings
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Hydraulic cylinders
Electrical components available:
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Starters
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Alternators
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Wiring harnesses
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Switches and gauges
Parts for the body and chassis include:
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Sheet metal components
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Seats and cab parts
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Wheels and tires
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Steering components
Common maintenance parts include:
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Filters (oil, fuel, air)
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Belts and hoses
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Spark plugs (for gas models)
Parts for the John Deere 4620 can be found through various channels:
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Authorized John Deere dealerships
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Aftermarket parts suppliers
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Online marketplaces specializing in tractor parts
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Salvage yards for used or hard-to-find components
Many parts are still manufactured new, while others may need to be sourced from used inventory or remanufactured. For those restoring a 4620, reproduction parts are also available for some components.
John Deere 4620 Horsepower
The John Deere 4620 tractor was factory rated at 135 horsepower (hp) at the power take-off (PTO). This rating was consistent across different transmission options available for this model.
In official tests, the John Deere 4620 demonstrated slightly higher horsepower than its factory rating:
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PTO Horsepower: 135.76 hp
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Drawbar Horsepower: 115.75 hp
The 4620 was equipped with a John Deere 6.6L 6-cylinder diesel engine. This engine featured:
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Intercooler and turbocharger
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Displacement: 404 cubic inches (6.6 liters)
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Rated engine speed: 2200 RPM
While the factory rating was 135 hp, actual power output could vary slightly depending on factors such as:
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Transmission type (Syncro-Range or Power Shift)
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Engine condition and maintenance
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Environmental conditions during operation
Some tractor enthusiasts have reported the ability to increase the horsepower of the 4620 through modifications:
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Reports of increasing power to 180-200 hp with adjustments
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However, such modifications may affect engine longevity and warranty
It’s important to note that any modifications to increase horsepower beyond factory specifications should be done with caution and by experienced professionals to ensure the tractor’s reliability and safety.
John Deere 4620 Powershift
The John Deere 4620 Powershift is a variant of the 4620 tractor model, featuring a full power shift transmission. This transmission option provides enhanced operational flexibility and ease of use compared to the standard Syncro-Range transmission.
The Powershift transmission for the John Deere 4620 offers:
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8 forward gears
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4 reverse gears
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Full power shift capability
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Hydraulic wet disc clutch system
The Powershift transmission has a larger oil capacity compared to the Syncro-Range:
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Oil capacity: 72 quarts (68.1 liters)
The 4620 Powershift model features a slightly larger hydraulic system capacity:
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Hydraulic system capacity: 18 gallons (68.1 liters)
While the Powershift transmission doesn’t directly increase the tractor’s horsepower, it offers several advantages:
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Smoother gear changes under load
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Reduced operator fatigue
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Improved efficiency in operations requiring frequent speed changes
The Powershift transmission provides:
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Easier operation in varied field conditions
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More efficient power delivery to the ground
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Potential for increased productivity in certain tasks
The Powershift transmission may require:
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More frequent oil changes
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Regular inspection of hydraulic components
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Specialized service tools for major repairs
The 4620 Powershift was popular among farmers who valued:
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Ease of operation in diverse field conditions
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Reduced operator fatigue during long working hours
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Improved performance in tasks requiring frequent speed changes
While the Powershift option added complexity to the tractor, many operators found the benefits outweighed the additional maintenance requirements.
John Deere 4620 Problems
The John Deere 4620 is known to experience hydraulic problems, particularly as the system warms up. Common issues include hydraulic chatter, pressure drops, and inconsistent flow. These problems may stem from leaks, priority valve malfunctions, or worn brake linings that plug the sump screen. Additionally, low hydraulic performance at idle RPMs can occur, affecting steering, brakes, and PTO operation.
The Powershift transmission can be jerky during gear shifts, especially in higher gears. Smooth operation often requires careful throttle modulation. Weak transmission pumps or clogged filters can lead to slow or weak performance in steering and three-point hitch systems. In Syncro-Range models, worn synchros may cause difficulty shifting between gears.
The clutch in the John Deere 4620 can be prone to wear and overheating if operated improperly. Avoid starting under heavy loads or slipping the clutch excessively to prevent damage.
The factory cab is loud and lacks modern soundproofing. Operators often report discomfort due to high noise levels during extended use. Adding sound insulation or wearing ear protection can mitigate this issue.
While the 4620 has a factory intercooler for improved cooling, overheating can occur if the radiator is not kept clean or if fuel settings are adjusted beyond factory specifications.
Due to limited production numbers, some parts for the 4620 can be harder to source compared to more popular models. Maintenance of older tractors may require sourcing used or remanufactured components.
Regular servicing of oil, filters, and screens is crucial for reliable operation. Addressing minor issues promptly can prevent larger failures in hydraulic and transmission systems.
John Deere 4620 Weight
The John Deere 4620 tractor has varying weight specifications depending on its configuration and equipment:
The shipping weight of the John Deere 4620 is approximately 12,980 pounds (5,887 kg).
The operating weight of the tractor ranges from 12,980 to 14,930 pounds (5,887 to 6,772 kg).
When fully ballasted, the John Deere 4620 can weigh up to 18,640 pounds (8,455 kg).
The weight distribution of the John Deere 4620 can vary based on factors such as:
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Tire size and configuration
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Additional equipment or attachments
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Fluid levels in the tires
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Use of front or rear weights
The weight of the John Deere 4620 is crucial for several reasons:
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Traction: Heavier weight provides better traction for field operations
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Stability: Proper weight distribution enhances stability during operation
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Implement compatibility: Weight affects the tractor’s ability to handle various implements
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Soil compaction: Weight influences the tractor’s impact on soil structure
Farmers can adjust the weight of their John Deere 4620 by:
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Adding or removing wheel weights
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Using liquid ballast in tires
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Attaching front or rear weight brackets
Proper weight adjustment is essential for optimizing the tractor’s performance in different agricultural tasks and field conditions.
John Deere 4620 Loader
The John Deere 4620 tractor is compatible with various front-end loader models. While not originally equipped with a loader from the factory, many 4620 tractors have been retrofitted with loaders for increased versatility.
Several loader models can be fitted to the John Deere 4620, including:
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John Deere branded loaders
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Aftermarket loaders from manufacturers like Koyker, Westendorf, and Allied
When installing a loader on a 4620:
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Reinforced mounting brackets are typically required
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The tractor’s frame may need additional bracing
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Hydraulic system modifications might be necessary
The 4620’s hydraulic system can support loader operations:
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Hydraulic capacity: 16-18 gallons (60.6-68.1 liters)
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Closed center hydraulic system
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May require additional valves or controls for loader functions
A loader on the 4620 can offer:
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Lifting capacity varies by loader model, typically ranging from 3,000 to 5,000 pounds
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Good reach due to the tractor’s size
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Enhanced versatility for various farm tasks
Adding a loader affects the tractor’s weight distribution:
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Front axle load increases significantly
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May require rear ballast for balance
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Total operating weight can exceed 15,000 pounds with a loader
When using a loader on a 4620:
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Visibility may be somewhat limited due to the tractor’s age and cab design
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The tractor’s power (135 hp) is sufficient for most loader tasks
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Care should be taken not to overload the front axle
Loader installation requires additional maintenance:
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Regular inspection of mounting hardware
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Increased attention to front tire wear and pressure
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More frequent hydraulic system checks and fluid changes
While not originally designed for loader work, the John Deere 4620’s robust construction and powerful hydraulics make it a suitable platform for loader applications when properly equipped and maintained.
John Deere 4620 Injection Pump
The John Deere 4620 tractor was equipped with a fuel injection pump that played a crucial role in its engine performance. This component underwent significant changes during the production run of the 4620 to address reliability issues and improve overall engine efficiency.
The early models of the John Deere 4620 were fitted with an RB “CB” style injection pump. This pump was mounted at the end of the camshaft oil pump drive.
Due to reliability issues with the original pump, John Deere implemented a significant upgrade:
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The RB “CB” pump was replaced with a DB style pump
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The new pump was relocated to the front of the engine
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It now ran off the timing gear set instead of the camshaft
The new DB style pump and its relocation offered several advantages:
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Improved reliability
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Better fuel delivery
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Enhanced engine performance
Alongside the injection pump upgrade, John Deere also added an intercooler to the 4620. This modification worked in tandem with the new injection pump to:
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Increase engine efficiency
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Boost horsepower output to 135 hp
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Improve overall engine cooling
The injection pump on the John Deere 4620 requires regular maintenance:
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Periodic inspections for leaks or wear
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Proper fuel filtration to prevent contamination
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Timely replacement of fuel filters
Some problems that may arise with the 4620’s injection pump include:
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Fuel leaks
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Loss of pressure
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Inconsistent fuel delivery leading to power loss
Proper maintenance and timely repairs are essential to keep the injection pump functioning correctly and ensure optimal engine performance.
John Deere 4620 Oil Filter
The John Deere 4620 tractor uses a spin-on type oil filter. This filter is crucial for maintaining the engine’s health by removing contaminants from the oil as it circulates through the engine.
The oil filter on the John Deere 4620 should be replaced:
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After the first 100 hours of operation
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Then after the first 500 hours
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Subsequently, every 500 hours or annually, whichever comes first
An extended 500-hour interval between oil and filter changes is permissible only when using:
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Plus-50 II oil
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Genuine John Deere OEM oil filters
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Diesel fuel with sulfur content less than 15 mg/kg (15 ppm)
If these conditions are not met, the oil and filter should be changed every 250 hours.
The oil filter is typically located on the side of the engine block, easily accessible for maintenance.
When changing the oil filter:
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Warm up the engine to ensure proper oil drainage
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Remove the drain plug to allow oil in the filter to drain
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Unscrew the old filter
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Clean the filter mounting surface
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Apply a thin film of clean oil to the new filter gasket
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Install the new filter, tightening it by hand
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Refill the engine with the appropriate amount and type of oil
The oil capacity of the John Deere 4620, including the filter, is approximately 16 liters (4.2 gallons).
Regular oil and filter changes are essential for:
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Maintaining engine performance
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Extending engine life
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Ensuring proper lubrication of engine components
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Removing contaminants and wear particles from the oil
Always use high-quality filters and oils that meet John Deere specifications to ensure optimal engine protection and performance.
FAQ
The John Deere 4620 has a rated power of 135 horsepower.
The John Deere 4620 was produced from 1971 to 1972.
The 4620 was available with either an 8-speed Syncro-Range transmission or an 8-speed Powershift transmission.
The operating weight of a John Deere 4620 ranges from 12,980 to 14,930 pounds, depending on configuration.
Common tire sizes for the 4620 include 18.4×38 or 20.8×38 rear tires.
Yes, the 4620 can be fitted with various front-end loader models, though it wasn’t originally equipped with one from the factory.
The 4620 uses a closed-center hydraulic system with a capacity of 16-18 gallons.
Some 4620 models came equipped with a cab, often a Hiniker cab, while others had an open station.
The John Deere 4620 has a 1000 RPM PTO.
While some parts are still available, others can be harder to source due to the model’s limited production run.
Common issues include transmission problems, hydraulic system issues, and potential clutch weakness.
Oil changes are typically recommended every 500 hours or annually, whichever comes first, when using specified oil and filters.
Yes, the 4620 can still be used for various tasks like planting, tillage, and hauling, though it may lack some modern features and comforts.
The fuel tank capacity of a John Deere 4620 is approximately 50 gallons.
The 4620 is generally considered a powerful and reliable tractor for its time, offering good performance for heavy-duty farm work.