Yanmar diesel tractor EF494T. OPERATOR'S MANUAL - part 19

 

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Yanmar diesel tractor EF494T. OPERATOR'S MANUAL - part 19

 

 

EF494T OM 

72 

TROUBLESHOOTING 

In case of abnormality of machine, stop the engine and locate a problem by referring to the following table. 

1. Engine 

parts 

PROBLEM POSSIBLE 

CAUSE 

RESPONSE 

Won't start by main switch 

Shift lever in N? 
 

Set each shift levers in N. Under this condition, 
turn the main switch to START. 

Is battery liquid at normal level? 
Battery nor discharged? 

Add the battery liquid to the normal level. Charge 
the battery. 

Check the battery terminals for 
looseness or rust. 

Clean and fasten the terminals. Apply grease 
coating to avoid rusting. 

Main fuse blown 

Replace the fuse with new one. 

Switch trouble 

Have it repaired by the service representative. 

Starter trouble 

Have it repaired by the service representative. 

Self-starter running but the  
engine fails to start 

No fuel 

Add the fuel and remove air. 

Air in the fuel 

Remove air from the fuel. 

Fuel cock in the C position 

Put the fuel cock in the 0 position. 

Engine runs irregularly 

Air in the fuel supply system 

Bleed air. 

Water mixed in the fuel 

Remove water and replace with light oil 

Jet nozzle clogged 

Replace or repair the nozzle. 

Clogged fuel filter 
 

Clean or replace the filter element. 

Engine overheating 

Lack of cooling water 

Add cooling water. 

Loosened or damaged fan belt 

Adjust the tension of belt or replace the belt with 
new one. 

Clogged radiator fins 

Clean the radiator fins. 

Running out of engine oil 

Add engine oil. 

Overloaded 

Reduce the load. 

Low engine power 

Clogged air cleaner 

Check the air cleaner. 

Burnt nozzle 

Have it repaired by the service representative. 

Low compression 

Have it repaired by the service representative. 

Valve clearance incorrectly  
adjusted 

Have it repaired by the service representative. 

Incorrect timing of fuel jet 

Have it repaired by the service representative. 

Oil pressure lamp lighting 

Lack of engine oil 

Add engine oil to the normal level. 

Low engine oil viscosity 

Use the oil with adequate viscosity. 

Damaged pressure switch 

Replace the switch. 

Damaged oil pump 

Have it repaired by the service representative. 

Charge lamp lighting 

Damaged alternator 

Have it repaired by the service representative. 

Loosened or damaged fan belt 

Adjust the tension of the belt or replace the belt. 

 

EF494T OM 

73 

2. 

Clutch, brake and related parts 

PROBLEM POSSIBLE 

CAUSE 

RESPONSE 

Clutch not effective 

Is pedal play proper? 

Adjust the play of pedal. 

Brake not effective or effective 
one sided 

Is brake pedal play proper? 

Adjust the play of brake pedal. 

Brake pedal not returning  

Return spring is broken 

Change the return spring. 

quickly or it creeks 

Lack of grease in sliding mechanism 

Remove rust and apply grease. 

3. Hydraulic 

system 

PROBLEM POSSIBLE 

CAUSE 

RESPONSE 

Impossible to raise the 
attachment implements 

Hydraulic stop-slow turn valve and slow 
return valves are close. 

Open the hydraulic stop-slow turn  
valve and slow return valves. 

Lack of transmission oil 

Replenish oil to the normal level. 

Air is sucked through the suction pipe 

Fasten the filter case and fittings.  
Replace damaged pipes or O-rings. 

Clogged oil filter 

Clean or replace the oil filter. 

Damaged hydraulic pump 

Have it repaired at your service 
representative. 

Dusty control valve. O-rings worn 

Have it repaired at your service 
representative. 

Damaged cylinder 

Have it repaired at your service 
representative. 

Impossible to lower the 
attachment implements 

Hydraulic stop-slow turn valves are 
close 

Open the hydraulic stop-slow turn valves. 

Dusty control valve. O - rings worn 

Have it repaired at your service 
representative. 

Damaged cylinder 

Have it repaired at your service 
representative. 

4. Electric 

system 

PROBLEM POSSIBLE 

CAUSE 

RESPONSE 

Headlight not lighting 

Bulb blown 

Replace the lamp. 

Fuse blown 

Replace the fuse with new one. 

Disconnected wiring to the socket 

Correct the wiring. 

Poor contact 

Clean the terminals for better contact. 

Flasher lamp not light 

Bulb blown 

Replace the lamp. 

Fuse blown 

Replace the fuse with new one. 

Failure of flasher unit 

Replace the flasher unit. 

Poor contact of flasher lines 

Check connections of the earth line and 
termination. 

Lamps not lighting 

Bulb blown 

Replace the lamp. 

Fuse blown 

Replace the fuse with new one. 

Poor contact of supply lines 

Check connections and correct them if 
necessary. 

Damaged switches 

Replace the switches. 

Disconnected earth lead 

Reassure the connection of earth lead to the 
body. 

Discharged battery 

Recharge the battery. 

Horn not working 

Fuse blown 

Replace the fuse with new one. 

Bad contact of horn lines 

Check the horn line. 

 

 

EF494T OM 

74 

SPECIFICATIONS 

MODEL EF494T 

Drive type 

4-wheel Drive 

Dimensions 

Overall length (mm) 

3,230 

Overall width (mm) 

1,605 

Overall height (mm) 

2,355 

Wheelbase (mm) 

1,830 

Tread 

Front (mm) 

1,300, 1,466 

Rear (mm) 

1,270, 1,344 

Ground clearance (mm) 

375 

Weight (kg) 

1,540 

Engine 

Model 4TNV88 

Type 4-cycle, 

water-cooled 

diesel 

Output (SAE Gross) (HP/rpm) 

49/2,800 

Number of cylinders 

Bore x Stroke (mm) 

88 x 90 

Displacement (cc) 

2,189 

Air cleaner 

Dry, dual element 

Fuel tank capacity (liter) 

40 

Battery 12V-52AH 

Steering 

Hydrostatic 

Clutch 

Dry, single 

Brake 

Mechanical, wet disc 

Transmission 

Type Collar 

shift 

Gear shift (Forward x Reverse) 

F9 x R9 

Forward speed (km/hr) 

1.6-28.8 

Reverses speed (km/hr) 

1.7-29.7 

Max. speed, forward (km/hr) 

30.8 

Tire 

Front 8-18-6 

Rear 13.6-26-8 

Rear PTO 

Type Transmission 

PTO 

PTO shaft 

SAE1-3/8 inch (35mm), 6 spline 

Speed (rpm) 

568, 769 at rated engine speed 

Hydraulic 

Type Position 

control 

Hitch 

3 point hitch, category SAE #1 

Draw bar hitch 

Clevis type 

NOTE: 
All technical data, measurement and weight are approximate, and the manufacturer has the right to make 
alteration without prior notice. 

TRACTOR MASS AND TIRE SPECIFICATION 

TIRE SIZE 

(Number of plies) 

 

FRONT AXLE

REAR AXLE 

Maximum 
working load of 
tires 

Technically 
permissible mass 
on each axle 

Maximum 
working load of 
tires 

Technically 
permissible mass 
on each axle 

F: 8-18(6), R: 13.6-26(8) 

kg

 

650 980 1,580 

1,675 

 

 IMPORTANT 

Set up the implement so that the front wheel load and the rear wheel load are not greater than the 
smaller of the following: the permissible load capacity of the tires or the technically permissible 
mass on each axle.  
 

EF494T OM 

75 

IMPLEMENT CAPACITIES 

 
The Yanmar tractor has been carefully tested in the configuration equipped with implements sold or 
approved by Yanmar and has proved to perform property.  Do not use any implement that has not been sold 
or recommended by Yanmar, or that fails to satisfy the specified values given below.  Using with implements 
that are not approved by Yanmar could result in malfunction, failure, and damage to the tractor and/or 
implement, and increase the possibility of injury to the operator or other people.  The Yanmar warranty does 
not cover any malfunction or failure that results from use of an unapproved implement. 
 

 
 

Lower link end 

maximum lifting 

capacity 

Implement weight 

and size 

Maximum drawbar 

load 

Trailer loading weight 

maximum capacity 

 

W0 W1 W2 W3 

kg 1,350 

As specified in the 

implement capacity 

list 

500 2,325 

 
 

 

 

 
 
Implement capacity list 

Implement Description Unit 

Maximum 

Amount 

Rotary 

Tilling Width 

1.9 

Weight kg 

350 

Disc plough 

Disc Size(inch) & Total disc 

Inch x disc 

22X4, 24X3 

Weight kg 

300 

Poly disc plough 

Disc Size(inch) & Total disc 

Inch x disc 

22X6, 24X6 

Weight kg 

355 

Front blade 

Width m 

1.8 

Weight kg 

400 

Sun roof 

Weight kg 

35 

Length x Width 

1620 x 1270 

Grass cutter 

Width m 

1.4 

Weight kg 

250 

Trailer 

Load Capacity 

kg 

2325 

Drawbar Load 

kg 

500 

Front weight 

Weight 

kg 

150 

Rear wheel weight 

Weight, one side 

kg 

60 

 
 

 

 

 

 

 

 

 

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