COMBINE HARVESTER AW70V, VNQ, AW82V, VNQ. Manual - part 19

Periodic Inspection

 

77 

 

 

3- Mount the drain pin, add necessary anti-freezing 

liquid or long life coolant, and fill with pure water. 

4- Mount the cover of main radiator cap and start up the 

engine to fully mix the anti-freezing liquid or long life 
coolant with cooling water. 

 

Replacing interval 

Cooling water level 

1 year 

Appr. 7.2L 

 

 

<Use of anti-freezing liquid> 
Anti-freezing liquid can reduce the freezing point of 
water. Before delivery, the mixing ratio of the liquid is 
determined based on a cold resistance of -15℃, 
namely 70% water and 30% anti-freezing liquid. This 
mixing ratio should be adjusted if the ambient 
temperature is below -15℃. 
 

Ambient 

temperature(℃) 

-5 -10 -15 -20 -25 -30

Ratio

 

Water (%) 

85 75 70 65 60 55

Anti-freezing 
liquid (%) 

15 25 30 35 40 45

 
<Long life coolant> 
It is suggested to use a long life coolant for diesel 
engine instead of clean water.    The long life coolant 
avoids from rusting inside of the radiator. 
 
[Precaution] 



 

When replacing with new cooling water, be 
sure to add the anti-freezing liquid or long life 
coolant and perform idle running of the engine 
for 5 minutes to mix the liquid as quickly as 
possible. 



 

The mixing ratio, which varies with 
manufacturers, should be determined 
according to the instruction manual provided 
by the manufacturer. 



 

You can fill with pure water to make up natural 
consumption of cooling water. 



 

The effective period of anti-freezing liquid is 1 
year. Therefore, replace with new anti-freezing 
liquid every year. 

 

 

5. Replacing fuel filter 

 

 

Open flame is prohibited during operation. 

 

 

Be sure to wipe off fuel attached on all 
parts. Otherwise, fire hazard may be 
caused. 

 

After opening the rear cover of engine, you can see the 
fuel filter above the rear part of engine, a black 
container connected with the fuel inlet pipe and the inlet 
pipe of injection pump. (This is a one-piece filter that 
can not be cleaned and should be replaced with a new 
one.) 
 
 
 
 
 
<Replacing> 
1- When mounting the new filter with air inside, turn the 

key switch to “ON” to exhaust air. 

 

 

 

 

 

 

Replacing 

interval 

Every 200 hours 

Fuel filter

Periodic Inspection

 

78 

 

 

6. Cleaning the water separator

 

 

 

Open flame is prohibited during operation. 

 

 

Be sure to wipe off fuel attached on all 
parts. Otherwise, fire hazard may be 
caused. 

 
The water separator in the rear part of the machine can 
remove dirt and water in fuel. 
 
<Draining> 
Dismount the drain bolt shown below to remove water 
and dirt. 

 

 
<Cleaning>   
Dismount the water separator to clean the filter element 
inside. 
Item Interval 

Draining 

Every 50 hours 

Cleaning the filter element 

Every 100 hours 

Replacing the filter element 

Every 200 hours 

 
[IMPORTANT] 
The time of cleaning and replacing should be 
adjusted as per fuel quality. 
 
 
 
 
 
 
 
 

 

7. Draining the fuel tank

 

 

 

Open flame is prohibited during operation. 

 

 

Be sure to wipe off fuel attached on all 
parts. Otherwise, fire hazard may be 
caused. 

 
The fuel tank is subject to water and dirt sediment 
inside. The sediments may enter the fuel pipeline to 
cause problems, thus should be removed regularly. 
 
<Draining> 
Take off the drain plug at the bottom of the fuel tank to 
remove sediments inside. 
 

Interval 

Every 100 hours 

 

 

 

 

Drain 

bolt 

Fuel port

Drain bolt

Periodic Inspection

 

79 

 

 

8 Bleeding fuel system

 

 

 

Be careful to avoid fuel spilling on the 
engine fun belt, rubber vibration insulator, 
hose and other parts, and clean them with 
water if any to avoid fire hazard. 

 

Air may enter the fuel system and result in stalling of 
the engine after fuel is used up. 
1. Tighten the fuel tank cap after refueling. 
2. Put the key switch to “ON”, wait 20-30 seconds till air 

in the fuel pipeline is exhausted, and then move the 
switch to “Start” to start up the engine. 

 

9. Cleaning and replacing the air 

filter

 

 
The air filter can remove dust in the air to prevent wear 
of parts inside the engine. As lots of dust may be 
generated during harvesting, the filter should be 
cleaned frequently (every day) and replaced every 400 
hours. 
 
Cleaning interval 

Replacing interval 

Every day 

Every 400 hours 

 
<Cleaning and replacing> 
1. Open the air cleaner cover. 
2. Take out the filter element. 
3. Use the compressed air (7 kg/cm

2

) to purge inside 

the element. 

 

 

 

 

[Precaution] 



 

Keep the filter element dry. 



 

Do not clean the filter element with water or oil. 

 

 

● 

Engine oil may be consumed and 
failures be caused if the filter element 
is blocked. 

● 

Be careful to prevent deformation of 
the element during cleaning. Otherwise, 
dust may enter and cause abnormal 
wear of the engine piston and cylinder.

 

 

10. Cleaning the engine dust 

protector

 

 
The air entry is designed for suction of cooling air. It 
may be accumulated with dust, thus should be cleaned 
with a soft brush after the engine is stopped. Open the 
engine room cover, and remove dust on it. 
The screen of hydraulic oil cooler and radiator exposed 
to dust should also be cleaned. 
 

 

 

Air intake screen

Periodic Inspection

 

80 

 

 

[Precaution] 
Open the engine room cover to clean the hydraulic 
oil cooler inside it. 

 

 
<Cleaning the radiator screen> 
Open the engine compartment and dismount the 
radiator screen to remove chaff and dust on the side of 
hydraulic oil cooler. 
 

 

The screen must be cleaned before and after 
operation. 

 
Chaff and dust on it should be removed in a certain 
interval. 
 
[Precaution] 
Use a brush to clean deep inside. 
 

 

 

 

 
[Precaution] 



 

Check the screens frequently, and remove dust 
if any. 



 

Clean the fins of the radiator & the hydraulic oil 
cooler with a soft brush on a daily basis, and 
use the compressed air or low-pressure water 
to purge it after the busy season. 



 

The engine load may be increased if the air 
intake screen, the radiator screen and the fins 
of the radiator and the hydraulic oil cooler 
radiator are blocked by dust. 

 

11. Maintaining the battery

 

 
The battery used for this machine is free of 
maintenance. It is sealed and does not need any water 
prior to expiry of the service life. Use a hydrometer to 
check the battery status. If the meter is “transparent”, it 
means there is little electrolyte in the battery, service 
life of the battery is to expire, and the battery can be 
replaced. 

 

 

Designated battery 

95D31L 

 

 

Hydraulic oil cooler 

Radiator fins 

(+) Anode

(-) Cathode

Hydrometer 

Air outlet

Hydrometer