Engine:
Engine overhaul, troubleshooting, fuel system, cooling system, lubrication system, ignition/starting system, emissions control (if applicable).
Transmission:
Manual and/or powershift transmission repair, clutch system, drivetrain components (propshafts, differentials, axles).
Hydraulics:
Hydraulic system components, pump, cylinder, control valves, power take-off (PTO) hydraulics, hitch control.
Electrical:
Wiring diagrams, charging system, starting system, lighting, gauges, starter motor, alternator, battery service.
Chassis And Body:
Frame, front axle, steering system, braking system, wheels, tires, body panels, operator station, fenders.
Steering System:
Mechanical steering system, linkage, tie rods, steering arms, and potential power steering components (if equipped). Specific lubrication and adjustment points.
Braking System:
Detailed procedures for brake shoe inspection, adjustment, relining, and pedal free play.
Cooling System:
Radiator, fan, water pump, thermostat, hoses, and coolant recovery system diagnosis and repair.
Exhaust System:
Muffler, exhaust manifold, and pipe inspection and replacement.
Operator Controls:
Detailed explanation and repair procedures for steering wheel, brake pedals, clutch pedal, gear levers, throttle control, and PTO engagement.
Maintenance:
Scheduled maintenance, fluid changes, filter replacements, lubrication points, inspections.
Troubleshooting:
Diagnostic procedures for common and uncommon issues, symptom-based troubleshooting charts.
Repair:
Step-by-step repair instructions for all major components and systems, including disassembly, cleaning, inspection, and reassembly.
Adjustment:
Precise adjustment procedures for engine timing, valve clearance, brake systems, clutch engagement, and hydraulic controls.
Engine Rebuild:
Comprehensive engine overhaul procedures, including cylinder head removal/installation, piston and ring replacement, crankshaft and bearing service, camshaft and valve train servicing.
Hydraulic Component Service:
Detailed disassembly, inspection, and reassembly of hydraulic pump, control valves, cylinders, and filters. Includes troubleshooting for common hydraulic faults.
Wiring Harness Repair:
Instructions for tracing and repairing faults within the tractor's electrical wiring harness, including connector identification.
Depth:
Detailed technical specifications, torque values, clearances, tolerances, and diagnostic data equivalent to dealer-level service.
Diagnostic Charts:
Includes comprehensive diagnostic charts that correlate symptoms to potential causes and repair procedures.
Schematics:
Clear, detailed wiring diagrams and hydraulic schematics for accurate troubleshooting and repair of electrical and hydraulic systems.
Engine Model:
Typically Yanmar 3T72 Series (or similar displacement diesel engine for this class of tractor). Specific engine code would be present in the manual.
Horsepower Range:
Likely in the 15-20 HP range, depending on specific configuration (e.g., YM155 vs. YM155D which often indicates 2WD vs. 4WD and potentially slight power variations).
Injection System:
Direct injection, rotary or inline injection pump. Manual will detail specific pump type and timing.
Cooling Type:
Liquid-cooled (radiator, fan, coolant pump).
Oil Type:
Diesel engine oil, specific viscosity (e.g., SAE 10W-30 or 15W-40) and API classification will be detailed.
Bore And Stroke:
Specific bore and stroke dimensions for pistons and cylinders will be listed, crucial for engine rebuilds and parts identification.
Valve Clearance:
Precise cold and hot valve clearance specifications for intake and exhaust valves.
Compression Ratio:
Engine compression ratio, along with acceptable minimum and maximum compression pressure ranges during testing.
Timing Specifications:
Engine timing specifications, including injection pump timing and ignition timing (if applicable for gasoline variants, but typically diesel here).
Transmission Type:
Likely a 3-speed or 4-speed main gearbox with a 2-speed transfer case (e.g., 12 forward, 4 reverse speeds or similar range).
Optional Features:
Differential lock may be standard or optional depending on YM155 vs. YM155D designation and specific build.
Power Take Off:
Live PTO, typically 540 RPM, may have a secondary PTO option. Manual covers PTO engagement and maintenance.
Clutch:
Dry single or dual-plate clutch, with adjustment and replacement procedures covered.
Transmission Specifications
Gear Ratios:
Detailed gear ratios for all forward and reverse gears, as well as PTO gear ratios.
Transmission Fluid Type:
Specific type and viscosity of transmission and hydraulic fluid (e.g., Yanmar special hydraulic oil or equivalent UTF).
Transmission Fluid Capacity:
Exact fluid capacity for the transmission and hydraulic system for proper filling.
Wheelbase:
Specific dimensions will be in the manual, crucial for steering and stability specifications.
Overall Length:
Specific length from front bumper to rear implement mounting point.
Overall Width:
Overall width, typically measured at the rear wheels.
Overall Height:
Height to the top of the steering wheel or operator platform.
Operating Weight:
Approximate operating weight around 1000-1200 kg, with exact figures in the manual for balance and load capacity.
Front Axle Load:
Specifications for front axle load capacity, important for front-end loader compatibility.
Rear Axle Load:
Specifications for rear axle load capacity.
Engine Oil Change:
Typically every 100-200 operating hours, or annually. Manual will specify exact interval and conditions.
Transmission Hydraulic Fluid:
Intervals for fluid and filter changes for the transmission and hydraulic system will be detailed, often around 500-1000 hours.
Engine Oil Viscosity:
Specific SAE grade and API/ACEA classifications for diesel engine oil provided.
Hydraulic Fluid:
Type of hydraulic fluid (e.g., UTF - Universal Tractor Transmission Fluid) and its specifications will be detailed.
Coolant Type:
Type and mixture ratio of coolant (e.g., ethylene glycol based with anti-corrosion additives) specified.
Gear Oil Specifications:
Specifications for gearbox and differential oil if separate from hydraulic fluid.
Brake Fluid:
Type of brake fluid (if applicable, often integrated with hydraulic system for tractors).
Common Wear Items:
Potential common wear items include clutch friction plates, brake shoes, hydraulic filters, and fuel filters, all covered by the manual's repair sections.
Electrical Connections:
Corrosion in electrical connectors is a potential issue on older tractors; the manual's wiring diagrams are crucial for troubleshooting.
Lubrication Points:
Detailed chart of all lubrication points (grease fittings, oil points) and recommended lubrication intervals.
Filter Replacement Intervals:
Specific intervals for replacing engine oil filter, fuel filter, and hydraulic filter.
