Tractor engines – Engine operation-Understanding the working principle of a Diesel engine - 4 Stroke
compression- Ignition engine cycle-Inlet and Outlet valves– Valve timing diagram- Engine efficiency -
Engine operating cycle -Firing order –Firing interval - Combustion chambers – Construction details of
engine blocks, Cylinder head and Crankcase - Features of cylinder , Piston, Connecting rod and
Crankshaft.
Lab Experiments:
Hand tools used in garage-fault diagnosis.
Study of valve and valve actuation systems
Air and fuel supply-air cleaner- Fuel pump- Exhaust– Silencer. Cooling and lubrication system- Starting
and electrical system-Transmission system-clutches, brakes, power train- transmission- Gears- Types of
high and low gears transmission- Gearbox- Differential and final drive mechanism- Engine governing
.Steering geometry– Steering systems- Front axle and wheel alignment Brake– types.
Lab Experiments:
Study of tractor engine systems using a working model of a tractor engine
Piston and cylinder-inspection – reconditioning and assembly of cranking system.
Tractor PTO, Belt-pulley, properties of Hydraulic fluids- Hydraulic system -hydraulic couplings, Torque
convertors- Hydraulic circuits- position and draft control- Weight transfer-theory of traction- Tractive
efficiency–Tractor chassis mechanics- Stability- longitudinal and lateral .Controls- visibility–operator’s
seat.Tractor Hitching.
Lab Experiments:
Study of fuel system assembly and adjustment
Study of lubricating system components
Power tiller-Special features-Clutch-Gearbox-Steering and brake. Makes of tractors and power tillers.
Types of tests-test procedure- Need for testing & Evaluation of farm tractor–Test codes for performance
testing of tractors and power tillers. Cost of operation of tractors and power tillers.
Lab Experiments:
Study of cooling system components.
Study of transmission system-assembly of gearbox, differential and final drive
Ergonomic aspects of tractors and power tillers- Substitution of fossil fuels with Biofuels to protect the
environment from GHG pollution-case studies on EV tractors.
Lab Experiments:
Study of brake and its adjustment-Steering system– assembly and adjustment-wheel tread Adjustment
Study of Tyres, Rims and Balancing methods of a tractor
Visit to tractor/power tiller manufacturing companies
Reference Book:
S.C.Jainand C.R.Rai, Farm tractor maintenance and repair. Standard publishers and distributors
,NewDelhi, 1999.
2 Jagadishwar Sahay, 1992. Elements of Agricultural Engineering. Agro book agency, Patna – 20.
3 Ralph Alcock, 1986, Tractor implement system. AVI Pub, co., Inc. West poert, Connectient.
4
Sreevastave, A.C., 1990. Elements of Farm Machinery, Oxford and IBH Publication Co. New
Delhi.
5
Mechanic Tractor, February 2016, Sector: Automobile, Common for Mechanic Tractor/
Mechanic Agriculture Machinery, Trade Practical, Developed by National Instructional Media
Institute, Directorate General of Employment & Training, Ministry of Labour & Employment,
Government of India, Chennai.
Text Book:
Sanjay Kumar, 2007, A TEXT BOOK OF TRACTOR AT A GLANCE, International book
distributing company, Lucknow.
2
R.K. Veera Selvam, Farm Machinery and Power, Oxford Book Company, 2010,ISBN 10:
9380179634 / ISBN 13: 9789380179636
3
Barger, E.L., J.B. Lilijedahl and E.C. Mc Kibben, 1997. Tractors and their power units. Wiley
Easterb Pvt Ltd, New Delhi
4 Nakra C.P 1970. FARM MACHINERY AND EQUIPMENT: Dhanpat Rai Publishing Company
Ltd, New Delhi
