Yanmar diesel tractor EF494T. OPERATOR'S MANUAL - part 18

EF494T OM 

68 

14. Adjusting 

clutch 

Standard version  
Depress the clutch pedal to see it there is a specified 
play of 15-25 mm. It not, adjust the turnbuckle for a play 
of 15-25 mm. Securely lock the nut after adjustment.  
 

(A) Play 15-25 mm  
(B) Turn buckle 

 

 

 

15. Adjusting 

steering 

wheel 

 WARNING 

Check a play for the steering wheel. It should be within a 
tolerable range. Otherwise, an accident may occur.  
 
Turn the steering wheel slightly left and right to see if 
there is a play of 20-50 mm. Improper play will fail to 
provide the smoothness and linearity of steering 
function. If a play is not adequate, contact your service 
representative.  
 

(A) Play 

 

 
 
 

 
 

 

EF494T OM 

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16. 

Adjusting fan belt 

 CAUTION 

Wait until the engine is sufficiently cooled down. 
Otherwise, you may be burned. 
 
(1) Switch off the engine.  
(2) Open the bonnet, then the left side cover of the 

engine.  

(3) Press the fan belt with a finger at the midpoint to see 

the belt deflections 10-15 mm. 

(4) If not, loosen the alternator fastening bolt and shift 

the alternator to adjust the belt tension.  

 
If the belt still slips after full shift of the alternator, 
replace the belt with a new one. Check the new belt at 
intervals of 50 hours. 
 

(A) Alternator  
(B) Alternator fastening bolts  
(C) Fan belt 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

17. Adjusting 

tow-in 

Poor adjustment of tow-in will result in an abnormal 
steering performance. Measure the front wheel 
dimension A and B. The difference of A-B should be 4-8 
mm. If out of this range, loosen the lock nut of the tie rod 
end and adjust the turnbuckle. Fasten the lock nut 
where the tow-in is  
4-8 mm. 

 
(A) Front  
(B) Tie rod  
(C) Lock nut 

 

 
 
 

 

 
 

 

EF494T OM 

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18. Replacing 

fuse 

 
Remove the lid of the fuse box and check the fuse. 
Replace the blown fuse with new one.  
Stop the engine and check the main fuse (slow blow 
fuse) which shuts off the electrical circuit when an 
excessive current flows. Fused condition can be 
checked by the changed color of the outer sheath. 
 

(A) Fuse box 

 

 

 

 

START  : Starter motor 

5A 

WORK  : Working light 

5A 

TURN   : Turn signal light  5A 
TAIL  

: Tail light 

5A 

HEAD   : Head light 

15A 

HORN   : Horn 

5A 

FUEL   : Fuel pump 

5A 

ENG   : Timer relay 

5A 

IND  

: Indicator light 

5A 

 

 

 

 

 

 

(A) Main fuse: 60A  
(B) Alternator fuse: 60A 

 

 

 
 

 

EF494T OM 

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19. Checking 

tires 

Adjust the air pressure of front and rear tires to the 
standard pressure. Check the tires for cracks or damage. 
Adjust the front tire pressure for a maximum in the 
following table if a load is to be imposed on the front tires 
through the front weight or front loader. 
 

Air pressure (kg/cm

2

) 

Front tire 

2.4 

Rear tire 

2.0 

 
 

Fastening torque (Front and rear) 
 
Fixing bolts for wheel and axle shaft:  

 

186 N-m (19 kgf-m) 

 

 
 
 

Excessive Standard  Insufficient

 

20. 

Color of exhaust gas 

The color of exhaust gas is black when the engine is 
started and gray during normal operation.  
 
Black: Incomplete combustion due to dense fuel  
White: Engine oil is burning. Normal exhaust may 
 look white at extremely low temperature. 
 
If exhaust gas is black or white without a load on the 
tractor, consult your service representative.