| Manufacturer | Zetor |
| Price | - |
| Model | 6421 |
| Equipment Type | - |
| Factory | Brno, Czechoslovakia |
ZETOR 6421 POWER
| Engine | 64hp / 47.7kW |
| PTO (claimed) | 60hp / 44.7kW |
ENGINE DETAIL
The Zetor 6421 tractor features a turbocharged 4-cylinder diesel engine, providing a robust output of 64hp at a low-rated RPM of 2200, enhancing torque for field work applications. Its 4.2L displacement allows for efficient fuel combustion while maintaining durability, making it suitable for tasks such as plowing and hauling. However, operators should consider that the 12V starter system necessitates proper maintenance to ensure reliability in starting under various operational conditions.
| Description | Zetor turbocharged diesel 4-cylinder liquid-cooled |
| Displacement | 254ci / 4.2L |
| Power | 64hp / 47.7kW |
| Rated RPM | 2200 |
| Starter volts | 12 |
ZETOR 6421 ENGINE
The Zetor 6421 is powered by a 4.2L 4-cylinder diesel engine, providing a balance of power and efficiency suitable for mid-range agricultural tasks. It offers two fuel tank options, with a ROPS capacity of 20 gallons (75.7L) for open-field operations and a cab capacity of 32 gallons (121.1L) for extended fieldwork and comfort. The choice between fuel tank configurations allows for flexibility in operation duration and suitability for varying agricultural environments, but requires careful consideration of weight distribution and overall machine stability.
| Description | Zetor 4.2L 4-cyl diesel |
| ROPS Fuel tank | 20gal / 75.7L |
| Cab Fuel tank | 32gal / 121.1L |
TRANSMISSIONS OVERVIEW
The Zetor 6421 features a 10-speed syncromesh transmission paired with a 12-speed mechanical shuttle, providing excellent versatility in speed management and direction changes, enhancing operational efficiency. The syncromesh design allows for smoother gear shifts, beneficial in both field and road applications, while the mechanical shuttle offers quick transitions for tasks like loader work or plowing. However, mastering the multiple gears may require more operator training, which could be a consideration for less experienced users.
| Description | 10-speed syncromesh 12-speed mechanical shuttle |
TRANSMISSION 1
The Zetor 6421 features a syncromesh transmission, providing smoother gear shifts, which is advantageous for maintaining operational efficiency during fieldwork. Its 10 forward and 2 reverse gears offer versatility in various agricultural tasks, although the limited reverse gears may challenge maneuverability in tight spaces. The 304.8mm hydraulic cerametallic disc clutch enhances durability and performance, making it suitable for heavy-duty applications but may require meticulous maintenance to ensure optimal function.
| Type | syncromesh |
| Gears | 10 forward and 2 reverse |
| Clutch | 304.8mm hydraulic cerametallic disc |
SPEEDS 1
| Description | With 16.9-34 rear tires |
TRANSMISSION 2
The Zetor 6421 features a mechanical shuttle system, providing swift direction changes without clutch disengagement, which enhances operational efficiency, particularly in loader applications. With 12 forward and reverse gears, it allows for versatility in various field conditions, although the gearbox requires careful management to prevent wear. The 304.8mm hydraulic cerametallic clutch offers durability and effective torque transfer, ideal for heavy-duty tasks, but may necessitate more precise handling during engagement to avoid stalling in demanding situations.
| Type | mechanical shuttle |
| Gears | 12 forward and reverse |
| Clutch | 304.8mm hydraulic cerametallic disc |
SPEEDS 2
| Description | With 16.9-34 rear tires. Reverse speeds are 10% faster than forward |
MECHANICAL
The Zetor 6421's 4x2 2WD chassis offers simple handling and maintenance but may limit traction in challenging terrain. The optional air-conditioned cab enhances operator comfort, making it suitable for extended use in varying climates. Its 10-speed syncromesh or 12-speed mechanical shuttle transmissions provide versatility for various agricultural tasks, though the lack of 4WD may hinder performance in wet or uneven conditions.
| Chassis | 4x2 2WD |
| Cab | Two-post folding ROPS. Cab optional with air-conditioning. |
| Transmissions | 10-speed syncromesh/12-speed mechanical shuttle |
HYDRAULICS
| Type | open center |
| Pressure | 2900psi / 200.0bar |
| Valves | 3 |
| Pump flow | 14gpm / 53.0lpm |
| Total flow | 18gpm / 68.1lpm |
TRACTOR HITCH
| Rear Type | II/I |
| Control | position and draft control |
| Rear lift | 6830lbs / 3098kg |
POWER TAKE-OFF (PTO)
| Rear PTO | independent |
| Rear RPM | 540/1000 |
ZETOR 6421 TIRES
The Zetor 6421 features a robust tire configuration with 9.00-16 agricultural fronts for enhanced maneuverability and 16.9-30 agricultural rears, providing excellent traction and stability. This tire sizing is advantageous for diverse terrain handling, particularly in medium to heavy-duty fieldwork scenarios. However, operators should be cautious of potential soil compaction from larger rear tires, which can affect crop yields in sensitive areas.
| Ag front | 9.00-16 |
| Ag rear | 16.9-30 |
DIMENSIONS
| Wheelbase | 90inches / 228cm |
| Length | 152inches / 386cm |
| Width | 73inches / 185cm |
| Height (ROPS) | 103inches / 261cm |
| Height (cab) | 102inches / 259cm |
| Weight | 7240lbs / 3284kg |
| Ground clearance | 22inches / 55cm |
| Front tread | 56 to 71inches / 142to 180 cm |
| Rear tread | 56 to 71inches / 142to 180 cm |
DIMENSIONS & TIRES
The Zetor 6421 tractor features a 90-inch wheelbase, which provides stability during operation, particularly useful for tasks requiring traction on uneven terrain. Weighing 7,240 lbs (3,284 kg), its robust structure supports heavy-duty applications but may challenge maneuverability in tight spaces. The tire specifications, with wider rear tires (16.9-30), enhance grip and power transfer to the ground, making it ideal for agricultural applications but potentially limiting efficiency on hard surfaces.
| Wheelbase | 90inches / 228cm |
| Weight | 7240lbs / 3284kg |
| Front tire | 9.00-16 |
| Rear tire | 16.9-30 |
ZETOR 102H LOADER
| Loader weight | 2100lbs / 952kg |
| Height (to pin) | 122inches / 309cm |
| Clearance, dumped bucket | 98inches / 248cm |
| Dump reach | 38inches / 96cm |
| Dump angle | 40° |
| Reach at ground | 73inches / 185cm |
| Rollback angle | 20° |
| Breakout force (at pin) | 5320lbs / 2413kg |
| Breakout force (at 800mm) | 2860lbs / 1297kg |
| Lift to full height (at pin) | 3930lbs / 1782kg |
| Lift to full height (at 800mm) | 2030lbs / 920kg |
| Bucket width | 73inches / 185cm |
| Raise time to height | 4 s |
| Bucket dump time | 3 s |
| Rollback time | 3.5 s |
ZETOR 102SLX LOADER
| Loader weight | 2300lbs / 1043kg |
| Height (to pin) | 127inches / 322cm |
| Clearance, dumped bucket | 91inches / 231cm |
| Dump reach | 20inches / 50cm |
| Dump angle | 60° |
| Reach at ground | 83inches / 210cm |
| Rollback angle | 40° |
| Breakout force (at pin) | 5960lbs / 2703kg |
| Breakout force (at 800mm) | 4280lbs / 1941kg |
| Lift to full height (at pin) | 4670lbs / 2118kg |
| Lift to full height (at 800mm) | 2500lbs / 1134kg |
| Bucket width | 73inches / 185cm |
| Raise time to height | 5.2 s |
| Bucket dump time | 2.5 s |
| Rollback time | 2 s |
ZETOR 112SLX LOADER
| Loader weight | 2450lbs / 1111kg |
| Height (to pin) | 137inches / 347cm |
| Clearance, dumped bucket | 107inches / 271cm |
| Dump reach | 34inches / 86cm |
| Dump angle | 60° |
| Reach at ground | 90inches / 228cm |
| Rollback angle | 40° |
| Breakout force (at pin) | 5180lbs / 2349kg |
| Breakout force (at 800mm) | 3590lbs / 1628kg |
| Lift to full height (at pin) | 3270lbs / 1483kg |
| Lift to full height (at 800mm) | 2120lbs / 961kg |
| Bucket width | 73inches / 185cm |
| Raise time to height | 5.6 s |
| Bucket dump time | 2.5 s |
| Rollback time | 2 s |