Yanmar diesel tractor EF494T. OPERATOR'S MANUAL - part 16

EF494T OM

7. Fuel

line

Fuel filter

Replace fuel filter every 300 hours.

Replacing

(1) Close fuel cock on water separator.
(2) Remove the cartridge by turning anticlockwise.
(3) Apply a little oil on the rubber ring on the new

cartridge. Mount the cartridge by hand first and tight it
with filter wrench.

(4) Open the cock and bleed the air from the fuel.

IMPORTANT

Use genuine element. Otherwise, FIE (Fuel
Injection Pump) will be in trouble, premature
wearing of plunger. It may cause a hard start of
the engine.

(A) Fuel filter

Water separator

Removing water from water separator

The water separator separates water from fuel oil. Water
accumulates in the fuel tank by formation of dew. The
water in fuel may damage the fuel injection pump when the
water gets in the plunger and barrel.

Drain the water accumulated in the water separator
regularly, every 100 hours or shorter if much water in the
bowl.

(1) Remove the cover [A].
(2) Turn the fuel cock (2) to (b) to close.
(3) Turn the drain cock (4) to drain the water.

[A] Cover
[B] Water separator
(2) Fuel cock
(4) Drain cock
(b) Close

Cleaning water separator element

Clean the element regularly, every 300 hours or shorter
when it gets dirty.

(1) Turn fuel cock (2) to (b) to close the fuel cock.
(2) Turn retaining ring (5) to remove ring and detach

water separator bowl.

(3) Clean strainer (3), inside of bowl.
(4) Reinstall strainer, bowl and retaining ring.
(5) Turn fuel cock to (a) to open the fuel cock.

NOTE:
Strainer is made of plastic and be careful not to damage. It
is suggested to clean it with used toothbrush or soft brush.
If strainer was damaged, replace it with a new genuine part.

(1) Water separator (2) Fuel cock
(3) Strainer (4) Drain cock
(5) Retainer ring
(a) Open
(b) Close

EF494T OM

Replacing radiator screen and air

cleaner elements

The air cleaner serves to keep the engine in favorable
conditions by removing dust in air and preventing the
cylinder liner and piston ring from wearing.

For operation in a dusty environment, clean the air
cleaner element every 50 hours and replace it every 300
hours.

For operation in a normal condition, clean it every 100
hours and replace it every 1000 hours. Even before the
said intervals, replace it every year.

Cleaning air cleaner element

(1) Open the bonnet.
(2) Remove the sub tank.
(3) Open the lid and take out the element.

(A) Air cleaner (Outer)
(B) Air cleaner (Inner)

(4) Blow air from inside of the element or lightly pat it

to take off dust. Be careful not to damage the fins.

IMPORTANT

When the inner element (B) is dirty, replace it. It cannot
be cleaned.

Cleaning radiator screen

Pull the radiator screen upward and remove straws and
dust from it.

(A) Radiator screen

EF494T OM

9. Checking

battery

DANGER

 Never use a fire while checking the battery or the

battery cap is removed. Otherwise, a fire or gas
explosion may result.

 Do not come in contact with the battery fluid. If the

fluid attaches on your body or cloth, immediately
wash out with water. Otherwise, you may be burnt.

CAUTION

To mount the battery, start with the positive lead (+). For
removal, start at the negative lead (-). Otherwise, a short
circuit will burn you.

Check battery

Check the level of battery electrolyte whether it is
between upper and lower limit line.
If the level is lower than the lower limit, add distilled water
as high as the upper limit.

(A) Battery
(B) Upper limit
(C) Lower limit

NOTE:
 Excessive battery fluid may overflow during

recharging, damaging the metallic parts of the tractor.

 Add distilled water only. Adding battery electrolyte,

such dilute sulphuric acid, may shorten the battery
life.

 Quick charge is not recommended.
 When replacing the battery, use the specified battery.

IMPORTANT

 Make sure the tractor is level when checking the level

of electrolyte.

Removing and installing battery

Remove
(1) Open the bonnet
(2) Disconnect the negative (ground) cable from the

battery and disconnect the positive cable.

(3) Loosen fixing nuts and remove the battery.

Installation
(1) Connect positive cable and negative cable.
(2) Tighten fixing nut.

(D) Negative (ground) cable
(E) Positive cable
(F) Fixing nut

EF494T OM

IMPORTANT

 Be sure the tractor is level when checking electrolyte level.

 When connecting the battery cables, wipe oil away

from the terminal contacts. After connecting cables,
apply grease to the terminals.

 Be sure to attach the rubber boots for the positive

terminal of the battery.

 When replacing the battery, be sure to use the genuine

battery or equivalent specified in the right table.

 For environmental protection and recycle of

resources, return the old battery fallowing the
regulation of your place.

Battery type

Specified battery

Parts code No.

75D26R 1A7781-51510

Voltage 12Volts

Capacity 5HR

52AH

Charging rate

11 Amperes

10.

Checking fluid lines

CAUTION

Aged or damaged pipes are subject to fuel leak which
will cause a fire. Check for a leak and replace the pipe
with new one.

Check the power steering pipes, fuel pipes and radiator
hoses for leak or loose couplings. Replace them every
two years, damaged or not damaged.

(A) Radiator hose
(B) Fuel pipe
(C) Power steering pipes

NOTE:
Bleed the air after the fuel pipe has been replaced.

11. Checking

electrical

wiring

WARNING

 Check before starting day's work that the cables are

not short circuit to other parts or insulator is not
damaged, or contacts are not loosened.

 Remove straws and dust from the cables and joints

before starting works. Otherwise, a short circuit can
cause a fire.

Remove the engine side cover and check the
electrical wires for damaged sheaths or loose
connections. Repair them or consult your service
representative.

Check them every 50 hours or every year.

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