Segment:
Compact Utility Tractor
Target Audience:
Small farm owners, property maintenance, landscaping professionals, hobby farmers.
Competitors:
Mahindra, Kubota, John Deere (compact series), LS Tractors, Kioti.
Powertrain:
Hydrostatic Transmission (HST) for ease of operation and variable speed control.
Model Designation:
T433HST indicates approximately 43 engine horsepower, T503HST indicates approximately 50 engine horsepower. Both likely share a common platform with engine options.
Utility:
Versatile for mowing, tilling, loader work, snow removal, and general property maintenance.
Systems Covered:
Engine, Drivetrain (HST Transmission), Hydraulics (Tractor Systems), Chassis, Steering, Braking, Electrical, PTO, Linkage, Operator Controls, Bodywork, Attachments Mounting
Estimated Page Count:
250-400 (typical for this type of comprehensive parts catalog)
Type:
Illustrated Parts Catalogue / Parts List Manual
Engine Components:
Cylinder block, cylinder head, pistons, crankshaft, camshaft, valves, fuel injection system, cooling system components, lubrication system components, air intake, exhaust system.
Drivetrain Components:
Hydrostatic Transmission (HST) unit, drive shafts, differentials, axles, bevel gears, final drives, front axle components, rear axle components, PTO shaft and gears.
Hydraulic System Components:
Hydraulic pump, control valve, hydraulic cylinders (lift, steering), hydraulic lines and hoses, filters, reservoir, auxiliary hydraulic ports (if applicable).
Chassis And Frame:
Tractor frame, mounting brackets, drawbar, front weight bracket, fenders, operator platform/seat assembly.
Steering System:
Steering column, steering wheel, tie rods, steering knuckles, power steering components (pump, cylinder, hoses).
Braking System:
Brake pedal, brake linkage, brake master cylinder, brake calipers/drums, brake discs, brake lines.
Electrical System:
Wiring harnesses, battery, starter motor, alternator, lights (headlights, taillights, work lights), fuses, relays, switches, ignition system components (if applicable).
Operator Controls And Instruments:
Dashboard instruments, control levers (throttle, gear selection, PTO engagement, hydraulic lift), pedals, warning lights, seat controls.
Power Take Off Pto:
PTO shaft, PTO clutch, PTO gears, PTO engagement lever and linkage.
Three Point Hitch And Linkage:
Lift arms, stabilizers, top link, draft links, implement pins and hardware.
Part Identification:
Detailed diagrams, exploded views, and part numbers for all components.
Assembly And Disassembly Reference:
Visual guidance for understanding component relationships for tear-downs, rebuilds, and overhauls.
Part Number Lookup:
Facilitates accurate ordering of replacement parts.
Service And Repair Reference:
Although primarily a parts catalog, the exploded views and part relationships are crucial for understanding repair processes.
Serial Number Correlation:
Identifies part applicability based on serial number ranges.
Depth:
Comprehensive, focusing on the identification and interrelationship of all individual parts and assemblies. Provides the foundation for all repair and maintenance activities.
Make:
TYM (Likely sourced from a reputable diesel engine manufacturer like Daedong or Yanmar, branded as TYM)
Type:
Diesel, 3- or 4-cylinder, naturally aspirated or turbocharged (model dependent)
Displacement:
Estimated 1.8L - 2.5L (typical for this HP range)
Horsepower Rating:
T433HST: Approx. 43 Engine HP; T503HST: Approx. 50 Engine HP (PTO HP will be lower)
Torque Rating:
Specific data not provided, but typical for diesel engines in this class.
Injection Type:
Indirect Injection (IDI) or Direct Injection (DI) common in this class.
Compliance:
Likely Tier 3 or EPA/CARB compliant for its respective production era and market.
Engine Oil Change:
Typically every 100-250 hours or annually, depending on operating conditions. Check manual for specific interval.
Air Filter Service:
Inspect and clean/replace as needed, based on operating environment (e.g., dusty conditions require more frequent checks).
Hydraulic Fluid Change:
Typically every 200-400 hours or every 1-2 years. Crucial for HST longevity.
Transmission Fluid Change:
Integrated with hydraulic system; follow hydraulic fluid change intervals. HST fluid is critical.
Engine Oil:
SAE 10W-30 or 15W-40 API CI-4 or higher (common for diesel engines, consult specific manual).
Hydraulic Fluid:
Tractor Hydraulic Fluid (THF) or Universal Tractor Transmission Oil (UTTO) meeting ISO 11158, John Deere J20C, or Case IH MS-1207 specifications. Crucial for HST.
Coolant:
Ethylene glycol-based antifreeze, 50/50 mix with distilled water.
Grease:
General-purpose lithium-based grease for lubrication points.
Hst Performance:
Degradation of HST performance can occur due to old or contaminated hydraulic fluid, or wear in the HST unit. Regular fluid changes are paramount.
Cooling System:
Clogging of radiator fins or hoses can lead to overheating, especially under heavy load in warm conditions.
Electrical Connections:
Corrosion or loose connections on lights, starter, or charging system can cause intermittent faults.
