Yanmar diesel tractor EF494T. OPERATOR'S MANUAL - part 11

EF494T OM 

40 

10. Driving 

in 

and out of Fields 

 

WARNING

 

  Always connect the left and right brake pedals with 

the connector. Otherwise, one-sided braking can 
cause a roll over. 

  When approaching the field or when crossing a 

ditch, use a gangplank of sufficient strength to enter 
the field. Lower any implement to reduce the center 
of gravity.  

  Climb a slope backwards, in reverse. Drive down a 

slope forward, in low gear. 

  Before starting to climb a hill, lower any implement. 

After the rear wheels are on the ridge (A), you can 
lift the implement. 

 

(A) Ridge 

 

 

 

11. Setting 

an 

adequate 

speed 

9 forward speeds and 9 reverse speeds are available by 
the combination of main, range and reverse shift levers. 
Use an adequate speed for works referring to the table 
below. 
 

(A) Main shift lever 
(B) Range shift lever 
(C) Reverse shift lever 

 

Driving Speed 

F/R 

Shift 

position 

Main shift 

Range shift

km/h 

Forward 

1 1 1 

1.63 

2 2 1 

2.26 

3 3 1 

3.30 

4 1 2 

4.00 

5 2 2 

5.57 

6 3 2 

8.14 

7 1 3 

14.18 

8 2 3 

19.72 

9 3 3 

28.80 

Reverse 

1 1 1 

1.68 

2 2 1 

2.33 

3 3 1 

3.41 

4 1 2 

4.13 

5 2 2 

5.74 

6 3 2 

8.39 

7 1 3 

14.62 

8 2 3 

20.33 

9 3 3 

29.70 

 

 

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12. 

Turning in a field 

 WARNING 

Disconnect the differential lock before turning. 
Otherwise, an intended turn will not be possible and an 
accident may result.  
Refer to the relevant section for operating the differential 
lock. 
 
Reduce the engine speed and make a slow and smooth 
turn. To enable a quick turn in the field, remove the 
connector linking the left and right brake pedals; upon 
turning the steering wheel, depress the brake pedal in 
the direction to which you want to turn.  
Lift up the implement and turn. 

 

13. Position 

control 

The position control maintains an implement in a wanted 
height.  
 
(1)  

Set the implement in an adequate height with 

the position control lever.  

(A) Position control lever  
(B) Stopper 

(2)  

To set the lower limit of the implement, adjust 

the position control lever until it stops in a wanted 
position. Fix it with the lowest stopper. 

 

 

14. 

Using differential lock 

 WARNING

 

  Disengage the differential lock before making a turn. 

Otherwise, intended turn is not possible and an 
accident will result. 

  Do not use differential lock while traveling on the 

road. Otherwise, stable drive is not assured, 
incurring an accident.  

 
Depressing the differential lock pedal locks the 
differential gearing and causes both side wheels to turn 
at the same speed. Releasing your toot from the pedal 
will automatically bring back the differential system.  
Lock the differential system when running or leaving a 
muddy path. It is also useful when the tractor fails to 
travel along a linear course.  
 

(A) Differential lock pedal 

 

IMPORTANT 

 

  Set the differential lock after reducing the engine 

speed.  

  If difficult to unlock the differential system, try to 

depress the clutch pedal or lightly depress the brake 
pedal. 

 

 
 
 
 
 
 
 
 
 
 

 

 

 

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15. 

Loading and unloading 

 

DANGER

 

While loading or unloading tractor to or from the truck, 
never try to change the course on the gangplank. Use 
the slowest speed. Do not use the clutch. Otherwise, 
loss of control can result in injury or damage to the 
tractor. 
 

 

WARNING

 

  Park the truck on the flat ground where less traffic is 

expected. Stop the engine and lock the parking 
brake. Block the wheels of the truck. Use the 
gangplank of sufficient strength. Fix or tie the 
gangplank on the truck.  

  Reverse shift for loading, forward shift for unloading 
  Fasten the tractor firmly with the rope. If the tractor 

falls off the truck, it may be damaged or injure 
someone. 

 

 
 

 
(1) Prepare the gangplank of sufficient strength.  
(2) Never fail to link the two brake pedals with the 

connector. 

(3) Put the shift in the LOW position and load the tractor 

onto the truck with a reverse shift. 

(4) Should engine failure occur, descend down the 

gangplank. Restart the engine and climb the 
gangplank. 

 

16. 

Adjusting wheel tread 

Adjust the tractor wheel tread according to the type of 
crops and widths of planting rows.  
 
Apply a wide wheel tread for works on slopes or for a 
traction work. 
 
Consult your service outlet for the adjustment of the 
wheel tread. 

 

 

 
 

 

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DANGER

 

  Do not drive the tractor if the wheel mounting bolts 

or nuts are loose. If the tractor is driven with loose 
nuts or bolts, there is a possibility that an accident 
will occur. 

  Make daily and periodic wheel inspections to check 

for loose nuts and bolts on the wheels. If they are 
loose, retighten them to the specified torque. 

  When wheel tread width was changed, check the 

bolts and nut tightening after the first 10 hours and 
again after the 50 hours. If the bolts are loose, 
retighten them.  After that, check every 100 hours 
operation. 

 

 
 
 

 

Fastening torque (Front and rear) 

Fixing bolts for wheel and axle shaft:    
186 N-m (19 kgf-m) 
 

 

 

FRONT TIRE: 8-18 

 

REAR TIRE: 13.6-26