COMBINE HARVESTER AW70V, VNQ, AW82V, VNQ. Manual - part 18

Periodic Inspection

 

73 

 

 

2. Checking and replacing oil of each 

part 

 

[Precaution] 
Keep the machine on a horizontal level while oiling. 
Oiling may be insufficient if the machine is inclined. 
 

Engine oil 

<Checking> 
1- Open the engine room cover 

 

 
2- Pull of the dipstick and clean its front end. Push the 

dipstick all the way in, and then take it out to check 
whether the oil level falls between the upper limit 
and lower limit of the dipstick. Fill or drain when 
necessary. 

 

 

 

 

Replacing 

interval 

First time: 50 hours 
2nd time : 200 hours 
After   :every 200 hours 

 
<Replacing> 
1- Drain oil by taking off the drain bolt under the engine, 
and add oil through the port. 

 

 

2- After replacing oil, start up the engine and run at a 

low speed till the oil pressure indicator is off. 

 

 

3- If engine oil is insufficient, add through the oil port to 

the specified level, and check any leakage. 

4- After the oil pressure indicator is off, turn off the 

engine, and use the dipstick to check oil level 5 
minutes later. Replenish if it is insufficient. 

 
 

Check and replace oil before the engine is started 
up or after it is cooled down. 

 

It will be easier to drain oil if you screw off the port 
cover. 

 

Lower

Dipstick 

Upper 

Oil port 

Drain bolt

Oil pressure indicator

Periodic Inspection

 

74 

 

 

<Replacing the engine oil filter> 
The engine oil filter is used to filter small particles and 
foreign matters in engine oil. 
* The filter should be replaced on a regular basis as it is 

a one-piece filter cartridge. 

 
1- After engine oil is drained, rotate the filter in the 

direction of arrow to remove it. 

 

 

 
2- Apply new engine oil on the rubber ring of the new 

filter. 

3- Screw the filter by 1 around or more turns after the 

rubber ring touches the installation surface of the 
filter. 

4- Add engine oil to the specified level. 
5- Check the oil level at steps 2 to 4 of “Checking”. 
 
[Precaution] 



 

Be sure to check whether there is any oil 
leakage on the installation surface of the filter. 



 

Use the genuine YANMAR engine oil filter. 
Failures may be caused if you use any other 
products. 

 

 

 

 

 

 

 

 

 
 
 
 

 

Transmission oil

 

 
<Checking> 
Check the transmission oil level through the sight glass 
on the left side of gear box, and add to the standard 
level if it is insufficient, and check any oil leakage at the 
same time. 
 

 

 

Recommended 

oil 

Replacing interval 

Standard 

level 

TF300 or TF500

Transmission oil

First time: 50 hours 
2nd time : 400 hours
After: every 400 
hours 

8.5L 

 
<Replacing> 
Remove the drain bolt at the bottom of the gear box to 
drain the old transmission oil. When adding oil, mount 
the drain bolt and take down the oil port cover to add, 
through the port, new oil to the standard level shown by 
the sight glass. 
 

 

Replacing 

interval 

First time: 50 hours 
2nd time : 200 hours 
After    : every 200 hours 

Engine Oil filter 

Sight glass

Drain bolt

Excessive  Standard Insufficient

Periodic Inspection

 

75 

 

 

* Be sure to wait till the engine becomes cool before 

checking the oil level. 

* It will be easier to drain oil if you remove the oil port 

cover. 

 
[Precaution] 



 

Keep the machine on a horizontal level ground. 



 

Raise the header to the highest position and fix 
the safety lock. 



 

Gears and bearing in the transmission and the 
case may be damaged if transmission oil is not 
replaced as scheduled. 



 

The transmission should be disassembled and 
checked every 1000 service hours of the 
machine. 

 

Other parts

 

Add oil to the specified level through the oil port. 

 

Recommended 

oil 

Replacing 

interval 

Standard 

level 

Rotor 

drive case 

Gear oil 90# 

First time:   

50 hours 

2nd time : 

400 hours 

After: every 

400 hours 

1.4L 

Hydraulic 

oil tank 

(about 3L 

in the 

pipe) 

Hydraulic oil 

VG46 orVG56 

Every 400 

hours 

17L 

 

Rotor drive case 

 

 

 
 
 

 
Hydraulic oil tank 

 

 

 

 

 

Oil port 

Drain bolt 

Upper

Lower

Drain bolt 

Periodic Inspection

 

76 

 

 

3. Replacing HST filter and   

hydraulic oil

 

 
HST filter and HST hydraulic oil should be replaced at 
the same time. 
Replacing HST filter and hydraulic oil 
1- Remove the drain plug at the bottom of hydraulic oil 

tank to drain the old oil. 
(Refer to the diagram for hydraulic oil tank above) 

2- Turn the HST filter element to the left to remove it. 

 

3- Apply new oil to the rubber sealing ring of the new 

HST filter, and then mount it in the original position. 

4- Remove the cover of hydraulic oil tank to add oil to 

the specified level. 

(Refer to the diagram for hydraulic oil tank above) 

5- After replacement, perform idle running of the engine 

for a few minutes, stop it and check the oil level with 
a dipstick. 

 

 
 
 
 

 
[Precaution] 



 

Be sure to check oil leakage on the installation 
surface of the filter. 



 

Use the genuine YANMAR HST filter only. 



 

Wipe off oil on the machine body. 

 
 

 

 
 

 

4. Checking and replacing cooling   

water

 

 

 

Do not open the radiator cap during 
operation of the engine or immediately 
after the engine stops. Otherwise, hot 
water may spill out and cause burning. 

 
<Checking> 
Check cooling water level in the sub tank, which should 
falls between “FULL” and “LOW”. Add pure water in the 
sub tank through the inlet port, and check water 
leakage at the same time. 

 

 

<Replacing> 
1- Remove the cover of engine room cover and the 

drain pin to completely drain water in the radiator. 

2- Remove the cover of main radiator, and wash out 

dust and rust inside with clean water. 

 

Before adding the detergent mixed with radiator 
cleaning fluid, drain water inside after 15 minutes 
idle running of the engine to make it easier to 
clean the radiator. 

 

Replacing 

interval 

Every 400 hours 

Sub tank

Upper

Lower

Drain pin