John Deere D140 Parts and Parts Manual PDF

John Deere D140 Parts

The John Deere D140 is a reliable riding lawn mower designed for homeowners with medium-sized yards. Featuring a 22-horsepower engine and a 48-inch cutting deck, it efficiently handles grass cutting tasks.

Its hydrostatic transmission offers smooth operation, allowing easy speed adjustment without the need for shifting gears. The mower also boasts a comfortable high-back seat and ergonomic controls for user convenience.

John Deere D140 Specs

  • Engine: 22-horsepower, V-twin, John Deere branded
  • Cutting Width: 48 inches (121.9 cm)
  • Cutting Heights: 1 to 4 inches (2.5 to 10.2 cm), adjustable in 0.25-inch increments
  • Transmission: Hydrostatic, foot-pedal operated
  • Steering: Sector and pinion with single drag link and tie rod
  • Seat: High-back, comfortable with lumbar support
  • Fuel Capacity: 2.4 gallons (9.1 liters)
  • Speed: Forward: 0-5.5 mph (0-8.9 km/h), Reverse: 0-3.2 mph (0-5.1 km/h)
  • Tires: Front: 15×6-6, Rear: 20×10-8
  • Warranty: 2-year or 120-hour bumper-to-bumper warranty (whichever comes first)

John Deere D140 Parts Diagram

The John Deere website offers access to owner’s manuals, parts diagrams, and other resources for the D140 lawn tractor to help owners maintain and service their equipment.

Weingartz, a John Deere parts supplier, also provides an illustrated parts lookup for the D140 model, allowing users to identify and order specific replacement parts.

The John Deere Parts Catalog website allows users to access detailed parts diagrams for the D140 and other John Deere equipment models.

When looking at the parts diagrams, pay attention to the part numbers associated with each component. This will allow you to accurately order the correct replacement part for your specific D140 model.

Make sure to have your D140’s full model number and serial number handy when referencing the parts diagrams and ordering replacements.

This ensures you get the exact parts made for your machine. The John Deere website also offers access to owner’s manuals and other resources that can provide additional guidance on identifying and ordering parts for the D140.

John Deere D140 Steering Parts Diagram

  1. The parts diagrams on the Jacks Small Engines website provide detailed exploded views of the D140’s front axle and steering components. This allows you to visually identify and locate specific steering parts.
  2. The parts lookup on the Green Part Store website lists individual steering components like the steering drag link that can be referenced using the parts diagrams.
  3. The Weingartz parts lookup tool also has an illustrated diagram specifically for the D140 100 Series tractor, which includes the steering and brakes section to pinpoint steering parts.

John Deere D140 Mower Deck Parts Diagram

The Green Part Store website provides a detailed parts diagram and lookup for the 48-inch mower deck used on the D140 lawn tractor. This diagram shows the individual components that make up the mower deck, including:

  • Mower blades (GX21784, GY20852, GX21785, GX21786)
  • Mower deck leveling gauge (AM130907)
  • Mulch kit (GY20417)
  • Gage wheels (GX10168)
  • Flat mower belt (GX21833)

The John Deere replacement parts guide also includes a section dedicated to the D140’s mower deck components, with part numbers and descriptions for these key parts. 

Additionally, the Weingartz website and Madison Tractor provide access to illustrated parts diagrams and lookups for the D140 mower deck and its associated hardware.

The above information also relates to : John Deere D140 Engine Parts Diagram

John Deere D140 Parts Manual PDF

The John Deere D140 parts manual and diagrams can be accessed through several sources:

  1. The John Deere website provides access to owner’s manuals, parts diagrams, and other resources for the D140 lawn tractor. This allows users to find the specific parts they need.
  2. The Jacks Small Engines website offers detailed exploded view parts diagrams for the D140 model, making it easy to visually identify and locate replacement components.
  3. The Madison Tractor Company website also has a dedicated section for D140 parts, including access to parts diagrams and the ability to order replacement parts online.
  4. The website and both host the full user manual for the John Deere D140, which includes information on maintenance, troubleshooting, and accessing parts.

Sections :

  1. Introduction: This section provides an overview of the manual, including instructions on how to use it effectively.
  2. Model Identification: Information about how to identify your specific model of the John Deere D140 mower.
  3. Engine Parts: Details and diagrams of all engine components, including the carburetor, air filter, spark plugs, and other related parts.
  4. Mower Deck Parts: Diagrams and lists of parts for the cutting deck, including blades, spindles, belts, and other related components.
  5. Transmission Parts: Information on parts related to the hydrostatic transmission system, such as pulleys, belts, and transmission components.
  6. Steering and Front Axle Parts: Details on steering system components, including the steering wheel, sector gear, tie rods, and front axle parts.
  7. Wheels and Tires: Information about wheels, tires, and related components.
  8. Electrical Parts: Diagrams and lists of electrical components, including the battery, wiring harness, switches, and lights.
  9. Frame and Chassis Parts: Details on frame and chassis components, including the main frame, seat, and other structural parts.
  10. Miscellaneous Parts: Any other parts not covered in the previous sections, such as hardware, fasteners, and small components.

John Deere D140 Parts List

  1. Engine Components: This section includes parts for the engine, such as the cylinder head, crankshaft, piston assembly, oil pump, and gaskets.
  2. Fuel System: Parts related to the fuel system, including the fuel tank, fuel pump, carburetor, fuel lines, and fuel filter.
  3. Electrical Components: This section lists parts for the electrical system, including the battery, starter motor, ignition switch, wiring harness, and safety switches.
  4. Mower Deck Components: Parts for the cutting deck, such as blades, spindles, belts, pulleys, and deck housing.
  5. Transmission Components: Parts related to the transmission system, including pulleys, belts, transmission assembly, and drive shaft.
  6. Steering and Front Axle Components: Parts for the steering system, including the steering wheel, sector gear, tie rods, and front axle assembly.
  7. Wheels and Tires: This section includes parts for the wheels and tires, such as rims, tires, wheel hubs, and axle components.
  8. Frame and Chassis Components: Parts for the frame and chassis, including the main frame, seat assembly, fenders, and footrests.
  9. Miscellaneous Hardware: This section lists various hardware items, such as bolts, nuts, washers, clips, and pins, used throughout the mower.

John Deere D140 Mower Deck Parts

  1. Blades: The cutting blades are responsible for cutting grass. The D140 usually has a set of two or three blades depending on the model.
  2. Spindles: Spindles are shafts onto which the blades are mounted. They rotate, allowing the blades to cut grass.
  3. Pulleys: Pulleys are used to transfer power from the mower’s engine to the blades via the drive belt. The D140 typically has idler pulleys and mandrel pulleys.
  4. Belt: The drive belt connects the engine’s pulley to the mower deck’s pulleys, transferring power from the engine to rotate the blades.
  5. Deck Housing: The deck housing is the structure that encloses the blades and other internal components. It’s typically made of steel or heavy-duty plastic.
  6. Deck Wheels: Deck wheels provide support and stability to the mower deck, especially when mowing over uneven terrain.
  7. Deck Wash Port: Some models of the D140 come with a deck wash port, which allows for easy cleaning of the underside of the mower deck.
  8. Spring Tensioners: These are used to apply tension to the deck belt, keeping it tight for efficient operation.
  9. Belt Guards: Belt guards are safety features that cover the drive belt and pulleys to prevent contact with them during operation.

John Deere D140 Steering Parts

  1. Steering Wheel: The steering wheel is the primary control for steering the mower. It is connected to the steering shaft and allows the operator to turn the front wheels.
  2. Steering Shaft: The steering shaft is a rod that connects the steering wheel to the steering gear assembly. It transmits the rotational movement from the steering wheel to the steering mechanism.
  3. Sector Gear: The sector gear is part of the steering mechanism and meshes with the pinion gear. It converts the rotational movement of the steering shaft into lateral movement to turn the front wheels.
  4. Pinion Gear: The pinion gear is another crucial component of the steering mechanism. It meshes with the sector gear and converts the rotational movement into lateral movement to turn the front wheels.
  5. Tie Rods: Tie rods are rods that connect the steering mechanism to the front wheels. They transmit the lateral movement from the sector gear and pinion gear to the wheels, causing them to turn.
  6. Drag Link: The drag link is a component that connects the steering mechanism to the front axle. It helps in coordinating the movement of the front wheels during steering.
  7. Steering Linkage: This includes all the rods, joints, and connections that make up the steering system, ensuring proper coordination and alignment of the front wheels.
  8. Steering Knuckles: The steering knuckles are part of the front axle assembly and provide attachment points for the tie rods. They also house the wheel bearings and allow the front wheels to pivot during steering.

John Deere D140 Engine Parts

  1. Engine Block: The engine block is the main housing for the engine’s cylinders, pistons, and crankshaft. It contains the internal combustion process.
  2. Cylinder Head: The cylinder head is attached to the engine block and contains the combustion chambers, intake and exhaust ports, and valves.
  3. Pistons: Pistons move up and down within the cylinders, compressing air and fuel mixture and converting the energy from combustion into mechanical motion.
  4. Crankshaft: The crankshaft is connected to the pistons via connecting rods and converts the reciprocating motion of the pistons into rotational motion, which drives the mower’s transmission and cutting blades.
  5. Camshaft: The camshaft controls the opening and closing of the intake and exhaust valves. It is synchronized with the crankshaft to ensure proper timing of the engine’s operation.
  6. Valves: Valves allow the intake of air and fuel into the combustion chamber and the exhaust of combustion gases. They open and close at precise times to facilitate the engine’s operation.
  7. Spark Plugs: Spark plugs ignite the air-fuel mixture in the combustion chamber, initiating the combustion process and generating power.
  8. Ignition System: The ignition system includes components such as the ignition coil, distributor (if applicable), and spark plug wires. It provides the spark necessary to ignite the air-fuel mixture in the combustion chamber.
  9. Air Filter: The air filter removes dust, dirt, and debris from the air entering the engine, preventing damage to internal components and ensuring efficient combustion.
  10. Fuel System: This includes components such as the fuel tank, fuel pump, carburetor or fuel injectors, and fuel lines. It delivers the proper amount of fuel to the engine for combustion.
  11. Oil Filter: The oil filter removes contaminants from the engine oil, helping to keep internal engine components lubricated and protected.

John Deere D140 Hood Parts

  1. Hood: The main component, the hood, is a large, plastic cover that encases the engine and other components located at the front of the mower.
  2. Grille Assembly: The grille assembly is typically located at the front of the hood and serves as an inlet for cooling air to reach the engine. It may include a grille frame, inserts, and other components.
  3. Hood Latch: The hood latch secures the hood in place when closed, preventing it from opening during operation. It typically consists of a latch mechanism and may include a handle for easy opening.
  4. Hood Hinge: The hood hinge allows the hood to be opened and closed smoothly. It is usually located at the rear of the hood assembly and may include hinge pins and mounting brackets.
  5. Decals and Emblems: Decals and emblems are often affixed to the hood to display the John Deere logo, model number, and other information.
  6. Hood Support Rod: The hood support rod holds the hood open while performing maintenance tasks, providing easy access to the engine compartment. It may be retractable or removable for convenience.
  7. Hardware: Various nuts, bolts, screws, and clips are used to secure the hood and its components in place.

John Deere D140 Problems

Common problems include :

  1. Starting Issues: If the mower won’t start, check the battery for charge, the spark plug for fouling, and the fuel system for any blockages or stale fuel. Also, ensure that the safety switches are engaged properly.
  2. Poor Cutting Performance: If the mower is not cutting grass effectively, check the condition of the blades for dullness or damage. Ensure that the deck is level and adjust the cutting height if necessary. Clean out any debris from the deck and make sure the belts are properly tensioned.
  3. Uneven Cutting: If the mower is leaving patches of uncut grass, check the deck for damage or misalignment. Ensure that the blades are sharp and properly aligned. Adjust the deck height to achieve a consistent cut.
  4. Transmission Issues: Problems with the hydrostatic transmission can manifest as difficulty in changing gears or loss of power. Check the transmission fluid level and condition. If the fluid is low or dirty, it may need to be replaced. Inspect the drive belt for wear or damage.
  5. Engine Overheating: If the engine is overheating, check the cooling system for blockages or leaks. Clean the radiator and ensure that the cooling fins are not obstructed. Check the oil level and condition, as low oil can contribute to overheating.
  6. Steering Problems: If the steering is stiff or unresponsive, check the steering components for damage or wear. Lubricate the steering linkage and pivot points. Ensure that the tires are properly inflated and aligned.
  7. Electrical Issues: Electrical problems can manifest as issues with starting, charging, or lighting. Check the battery connections for corrosion and ensure that the wiring harness is intact. Test the voltage regulator and charging system.

John Deere D140 Oil Type, Oil Filter and Oil Capacity

Oil Type:

  • The D140 uses Turf-Gard 10W-30 engine oil

Oil Filter:

  • The correct oil filter part number is AM125424

Oil Capacity:

  • The D140 engine oil capacity is 1.9 L (2 qt)

Specifically, the maintenance reminder sheet states that the D140 requires:

  • 1.9 L (2 qt) of Turf-Gard 10W-30 engine oil
  • AM125424 oil filter
  • Change interval of 50/100/150/200/250 hours

John Deere D140 Transmission

  1. Hydrostatic Transmission: The D140 features a hydrostatic transmission, which uses hydraulic fluid to transfer power from the engine to the wheels. This type of transmission offers infinite speed control without the need for shifting gears.
  2. Foot Pedal Operation: The hydrostatic transmission is controlled by foot pedals. Pressing the forward pedal propels the mower forward, while pressing the reverse pedal moves it backward. The farther the pedal is pressed, the faster the mower will travel in the corresponding direction.
  3. Ease of Use: The hydrostatic transmission provides smooth and effortless operation, making it easy for users to control the speed of the mower with precision. This makes navigating around obstacles and maneuvering in tight spaces much simpler.
  4. Maintenance: The hydrostatic transmission system requires regular maintenance to ensure optimal performance and longevity. This includes checking the fluid level and condition, inspecting for leaks, and replacing the hydraulic filter according to the manufacturer’s recommendations.

John Deere D140 Belt

The John Deere D140 riding mower uses belts to transfer power from the engine to the cutting blades and to drive the hydrostatic transmission.

  1. Mower Deck Drive Belt: This belt connects the engine’s pulley to the pulleys on the mower deck, transferring power from the engine to drive the cutting blades. It’s responsible for turning the blades to cut grass efficiently.
  2. Transmission Drive Belt: The transmission drive belt connects the engine’s pulley to the pulley on the hydrostatic transmission. It transfers power from the engine to the transmission, allowing the mower to move forward and reverse smoothly.

The D140 uses two main belts:

Traction drive belt – Part number GX20006
Mower deck belt – Part number GX21833 or GX20571

The mower deck belt is a 48-inch drive belt that is used to power the mower deck on the D140 lawn tractor. Replacement mower deck belts with the part numbers GX21833 and GX20571 are available from various retailers like LS Engineers and on eBay.

Some aftermarket options like a Kevlar-reinforced deck belt (Part number B08SC92Z8Z) are also available on Amazon. The John Deere website lists the specific belt part numbers and quantities needed for the D140’s 48-inch mower deck.

John Deere D140 Battery

  1. The D140 lawn tractor uses a 12V battery, specifically a Group U1 SLA (Sealed Lead Acid) battery.
  2. Recommended replacement battery options include the WEIZE Lawn & Garden AGM Battery, which is compatible with the D140 and other John Deere models.
  3. The battery cable part numbers for the D140 are GY21749 (positive) and GY21161 (negative), which can be purchased as replacement parts.
  4. The Batteries Plus website indicates they carry John Deere lawn tractor and mower batteries that would be suitable for the D140 model.
  5. No specific battery capacity or CCA (Cold Cranking Amps) rating is provided for the D140 battery, but a Group U1 SLA battery is recommended.

In summary, the John Deere D140 lawn tractor requires a 12V Group U1 SLA (Sealed Lead Acid) battery, with compatible replacement options available from retailers like Amazon and Batteries Plus. The specific battery cable part numbers are also identified for the D140.

John Deere D140 Reviews

  1. Reliability: Many users appreciate the durability and longevity of the D140. They often mention that it starts easily and runs smoothly, even after years of use.
  2. Cutting Performance: Owners frequently commend the mower’s cutting performance, stating that it provides a clean and even cut, even in thick or tall grass. The adjustable cutting height and wide cutting deck are also praised for their versatility.
  3. Comfort and Ergonomics: The high-back seat, ergonomic controls, and smooth operation of the hydrostatic transmission contribute to a comfortable and enjoyable mowing experience for many users.
  4. Ease of Maintenance: Reviewers often mention that the D140 is easy to maintain, with accessible components and straightforward maintenance procedures.
  5. Build Quality: The John Deere brand’s reputation for quality is reflected in many reviews, with owners expressing satisfaction with the mower’s sturdy construction and overall build quality.

John Deere D140 Blades

  1. The D140 lawn tractor uses 3 mower blades:
    • GX21784
    • GY20852
    • GX21785
    • GX21786
  2. These blades are 3-in-1 standard blades that can be used for mulching, bagging, or side discharge.
  3. Replacement mower blades with these part numbers are available from various retailers like Amazon, Lawn Mower Parts Online, and the John Deere website.
  4. The blades are 48 inches wide, matching the size of the D140’s mower deck.

John Deere D140 Attachments

  1. Bagging System: A bagging system collects grass clippings as you mow, keeping your lawn tidy. John Deere offers bagger attachments compatible with the D140 to make grass collection easy.
  2. Mulching Kit: A mulching kit chops grass clippings into fine pieces and disperses them back onto the lawn, where they decompose and provide nutrients to the soil. Mulching kits compatible with the D140 are available for purchase.
  3. Lawn Sweeper: A lawn sweeper attachment can be used to collect leaves, grass clippings, and other debris from your lawn. It’s a convenient tool for yard cleanup, especially during the fall season.
  4. Utility Cart: A utility cart can be attached to the D140 to transport materials, such as mulch, soil, or garden tools, around your property. It’s useful for various landscaping and gardening tasks.
  5. Snow Blower: In regions with snowfall, a snow blower attachment can be used with the D140 to clear snow from driveways and pathways, making it a versatile year-round machine.
  6. Front Bumper: A front bumper attachment adds protection to the front of the mower and can also serve as a mounting point for additional accessories, such as headlights or brush guards.
  7. Sun Canopy: A sun canopy attachment provides shade and protection from the sun while mowing on hot days, enhancing comfort during long mowing sessions.

John Deere D140 Bagger

  1. Bagger System: The bagger attachment consists of a collection hopper, chute, and two or three collection bags, depending on the specific model. The hopper mounts to the back of the mower deck.
  2. Collection Bags: The collection bags are typically made of durable fabric material and attach to the back of the hopper. They collect grass clippings as you mow and can be easily removed for emptying.
  3. Chute: The chute connects the mower deck to the collection hopper, directing grass clippings from the deck into the collection bags. It ensures efficient collection of grass clippings during mowing.
  4. Capacity: The bagger attachment for the D140 has a capacity of typically around 6.5 bushels, depending on the specific model. This allows you to mow for longer periods without needing to empty the bags frequently.
  5. Convenience: Using a bagger attachment with the D140 makes lawn cleanup easy and convenient. It helps maintain a tidy lawn by collecting grass clippings, leaves, and other debris as you mow.
  6. Installation: The bagger attachment is designed to be easy to install and remove, typically without the need for tools. It attaches securely to the mower deck, ensuring reliable performance during mowing.

In addition :

  1. The D140 is compatible with a 48-inch deck grass bagger with chute, which can be purchased from retailers like The Green Dealer.
  2. However, some users have reported issues with the bagger not fitting properly on the D140 model, as mentioned in the Green Tractor Talk forum.
  3. The John Deere S140 (S series) model uses a similar 48-inch bagging system that may provide guidance on the D140’s bagger setup
  4. Replacement parts for the D140’s rear grass bagger, such as the chute attaching strap kit, are available from the GreenPartStore.
  5. The Home Depot sells a 48-inch twin bagger kit (part number BUC10286) that is compatible with the 100 Series tractors, including the D140. However, it’s important to confirm compatibility before purchasing.

John Deere D140 Tires

  1. Front Tires: The front tires on the D140 are typically 15×6-6 in size. These tires are smaller in diameter compared to the rear tires and provide steering control and stability while mowing.
  2. Rear Tires: The rear tires on the D140 are typically 20×10-8 in size. These tires are larger in diameter and wider than the front tires, providing traction and stability, especially when navigating uneven terrain.
  3. Tread Pattern: The tires on the D140 are designed with a tread pattern that provides good traction on grass and other surfaces. The tread helps prevent slippage, especially when mowing on slopes or in wet conditions.
  4. Inflation Pressure: It’s important to maintain the correct tire pressure in the front and rear tires of the D140 to ensure optimal performance and stability. The recommended tire pressure can usually be found in the owner’s manual or on a decal located near the tires.
  5. Durability: John Deere uses high-quality materials to manufacture tires for its riding mowers, ensuring durability and long-lasting performance, even under heavy use.
  6. Replacement: If you need to replace the tires on your John Deere D140, it’s important to choose tires that are compatible with the mower’s specifications. Genuine John Deere replacement tires or tires from reputable manufacturers are recommended for best results.

John Deere D140 Snow Blower

The John Deere D140 riding mower can be equipped with a snow blower attachment to clear snow from driveways, pathways, and other areas.

  1. Snow Blower Attachment: The snow blower attachment is typically mounted to the front of the D140 mower, replacing the mower deck. It consists of a snow blower unit, chute, and controls.
  2. Snow Blower Unit: The snow blower unit is powered by the mower’s engine and features an auger that collects snow and throws it through the chute. It’s designed to efficiently clear snow from the ground surface, even in heavy snowfall conditions.
  3. Chute: The chute on the snow blower attachment directs the ejected snow away from the cleared area. It can usually be adjusted to control the direction and distance of the snow discharge.
  4. Controls: The D140’s snow blower attachment may come with controls that allow you to adjust the chute direction and angle from the operator’s seat. This makes it easy to change the snow discharge direction as needed while clearing snow.
  5. Compatibility: It’s important to ensure that the snow blower attachment is compatible with the John Deere D140 mower model you have. John Deere typically offers specific snow blower attachments designed to fit the D140 and other compatible mower models.
  6. Installation: Installing the snow blower attachment on the D140 may require removing the mower deck and attaching the snow blower unit to the front of the mower. Follow the manufacturer’s instructions carefully for proper installation.
  7. Maintenance: Like any equipment, the snow blower attachment for the D140 requires regular maintenance to ensure optimal performance and longevity. This may include lubricating moving parts, inspecting for wear, and cleaning the unit after each use.