Agricultural Machinery and Equipment  ·  Level 4
Farm Tractor Operation And Maintenance
Chapter 6: Perform adjustments to tractor components and systems
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Chapter Practical Activities

Practical 1: Adjust Tractor Engine Valves and Timing for Optimal Performance

Agricultural Machinery and Equipment · Level 4
Farm Tractor Operation And Maintenance
PRACTICAL ASSESSMENT
TIME: 4 HOURS
⬇ PDFCandidate Instructions (Candidate Tool)

Type: Individual

INSTRUCTIONS TO CANDIDATE:
1.  You are required to perform the following task:
i.  Adjust the valve clearances to 0.25 mm inlet and 0.30 mm exhaust and set ignition timing to 10 degrees before top dead centre on a diesel tractor engine as per the provided engine manual.
2.  You have been provided with the following resources for the practical task:
Tools & EquipmentMaterials
Valve clearance feeler gaugesEngine oil (SAE 15W-40)
Timing lightClean lint-free cloth
Socket wrench set
Screwdrivers
Feeler gauge set
⬇ PDFResources Required (Cutting List)
S/NItemQuantity
1Valve clearance feeler gauges1 set per Candidate
2Timing light1 Pc per 3 Candidates
3Socket wrench set1 set per Candidate
4Screwdrivers (flat and Phillips)1 set per Candidate
5Feeler gauge set (metric, 0.10mm to 0.50mm)1 set per Candidate
6Clean lint-free cloth2 Pcs per Candidate
7Engine oil (SAE 15W-40)500 ml per Candidate
8Tractor engine manual (specific to the model)1 Pc per Candidate
9Personal protective equipment (overall, safety boots, gloves, goggles)1 set per Candidate
⬇ PDFAssessor Guide
Items to be EvaluatedMarks AvailableMarks ObtainedComments
TASK 1: Preparation and PPE
Wore overall, safety boots, gloves, and goggles
(Award 3 marks if all PPE worn correctly, otherwise zero)
3
Sub-Total3
TASK 2: Valve Clearance Adjustment
Located and removed valve cover without damaging gasket
(Award 2 marks for careful removal)
2
Identified inlet and exhaust valves correctly
(Award 2 marks for correct identification)
2
Measured valve clearances with feeler gauge
(Award 3 marks for correct measurement technique)
3
Adjusted valve clearance to 0.25 mm inlet and 0.30 mm exhaust using correct tools
(Award 4 marks for accurate adjustment)
4
Reinstalled valve cover securely without leaks
(Award 2 marks for proper reassembly)
2
Sub-Total13
TASK 3: Ignition Timing Adjustment
Connected timing light according to manufacturer’s instructions
(Award 2 marks for correct connection)
2
Set engine to idle and observed timing marks
(Award 2 marks for correct observation)
2
Adjusted ignition timing to 10 degrees before top dead centre
(Award 4 marks for accurate timing adjustment)
4
Tightened timing adjustment screws and rechecked timing
(Award 2 marks for securing adjustment correctly)
2
Sub-Total10
TASK 4: Final Checks and Clean-up
Checked for oil leaks and cleaned work area
(Award 2 marks for thorough cleaning and leak check)
2
Applied a small amount of engine oil on valve cover gasket
(Award 1 mark for lubrication)
1
Sub-Total3
PRODUCT CHECKLIST
Valve clearances measured at 0.25 mm inlet and 0.30 mm exhaust within ±0.02 mm tolerance
(Award 5 marks if clearances are within tolerance, else zero)
5
Ignition timing set accurately at 10 degrees before top dead centre ±1 degree
(Award 5 marks if timing is accurate, else zero)
5
Valve cover reinstalled without leaks and secure fastening
(Award 3 marks for secure and leak-free assembly)
3
Sub-Total13
GRAND TOTAL42
ASSESSMENT OUTCOME:   ☐ Competent    ☐ Not Yet Competent (competent if at least 50%)

Practical 2: Adjust tractor clutch system for proper engagement and disengagement

Agricultural Machinery and Equipment · Level 4
Farm Tractor Operation And Maintenance
PRACTICAL ASSESSMENT
TIME: 4 HOURS
⬇ PDFCandidate Instructions (Candidate Tool)

Type: Individual

INSTRUCTIONS TO CANDIDATE:
1.  You are required to perform the following task:
i.  Adjust the clutch system of a Massey Ferguson 375 tractor to achieve proper pedal free play of 10-15 mm and smooth engagement/disengagement.
2.  You have been provided with the following resources for the practical task:
Tools & EquipmentMaterials
Wrenches (8mm, 10mm, 13mm)Lithium-based grease
Screwdriver setPersonal Protective Equipment (overall, safety boots, hand gloves)
Feeler gauge set
Grease gun
Rags and cleaning brush
⬇ PDFResources Required (Cutting List)
S/NItemQuantity
1Wrenches (8mm, 10mm, 13mm) and screwdriver set1 set per Candidate
2Feeler gauge set1 set per Candidate
3Grease gun with lithium-based grease1 per 2 Candidates
4Rags and cleaning brush1 set per Candidate
5Massey Ferguson 375 tractor with clutch system1 per Candidate
6Personal Protective Equipment (PPE): overall/dustcoat, safety boots, hand gloves1 set per Candidate
⬇ PDFAssessor Guide
Items to be EvaluatedMarks AvailableMarks ObtainedComments
TASK 1: Preparation and Safety
Wore the required PPE (overall, safety boots, hand gloves)
(Award 3 marks or zero)
3
Assembled all necessary tools and materials
(Award 2 marks or zero)
2
Sub-Total5
TASK 2: Clutch System Adjustment
Checked and cleaned the clutch linkage and pedal area
(Award 2 marks or zero)
2
Measured clutch pedal free play using a ruler or feeler gauge
(Award 3 marks or zero)
3
Loosened the lock nut and adjusted the clutch cable or rod to set free play to 10-15 mm
(Award 4 marks or zero)
4
Tightened the lock nut securely after adjustment
(Award 2 marks or zero)
2
Greased the clutch linkage points using the grease gun
(Award 2 marks or zero)
2
Tested the clutch pedal for smooth engagement and disengagement
(Award 4 marks or zero)
4
Sub-Total17
TASK 3: Finishing and Clean-up
Cleaned the work area and tools after adjustment
(Award 2 marks or zero)
2
Returned tools and materials to the designated place
(Award 2 marks or zero)
2
Sub-Total4
PRODUCT CHECKLIST
Clutch pedal free play correctly adjusted to between 10 mm and 15 mm
(Award 5 marks or zero)
5
Clutch engages and disengages smoothly without slipping or dragging
(Award 6 marks or zero)
6
All linkage points properly greased and free of dirt or debris
(Award 3 marks or zero)
3
Sub-Total14
GRAND TOTAL40
ASSESSMENT OUTCOME:   ☐ Competent    ☐ Not Yet Competent (competent if at least 50%)
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