COMBINE HARVESTER AW70V, VNQ, AW82V, VNQ. Manual - part 24

Trouble shooting

 

97 

 

 
In the event that mechanical condition becomes worse, turn off the engine and engage the 
brake pedal lock firstly, and then perform trouble shooting as instructed below to prevent 
accidents. Contact the dealer if you could not handle a failure.

 

 

1. Engine section

 

 

Condition Check 

Remedy 

Starter motor does 

not work when the 

key switch is 

turned to “Start” 

Brake pedal stepped? 

Put the key switch to “Start” after stepping the brake 
pedal to the floor 

Threshing clutch lever in “ON” position? 

Put the lever to “OFF” 

Dead battery? 

Recharge the battery 

Battery terminals loosened or corroded? 

Clean the terminals and apply antirust oil on them after 
tightening 

Fuse blown? 

Replace the fuse 

Starter motor 

rotates, but the 

engine can not be 

started 

Does the fuel pump work? 
(Blown fuse or faulty fuel pump) 

Replace the fuel pump 

Any fuel in the fuel tank? 

Refuel 

Fuel pipe damaged? 

Replace the fuel pipe 

Air mixed in fuel? 

Exhaust air 

Range shift lever in the “N” (neutral) position?

Put the lever to “N” 

Water leaking into the fuel tank? 

Drain water accumulated in the fuel filter or water 
separator 

Is the pipe blocked after the fuel tank is 
contaminated? 

Clean the fuel tank and pipe 

Engine stops 
unexpectedly 
during operation 

Any fuel? 

Refuel 

 

 

 

 

 

 

Trouble shooting

 

98 

 

 

2. Harvesting and conveying section

 

 

Condition Check 

Remedy 

Crops not 
conveyed 

Cutter blades and conveying chain stuck 

by grass, straw, mud, stone or other 
foreign matters? 

Check the blades and chain, and remove the 
foreign matters if any. 

Header drive belt loosened? 

Adjust the belt 

Rice root pulled 

out 

Crop divider cuts in the root of crop? 

Adjust the front end of reel 

Too rapid harvesting? 

Harvest at a speed suitable to the condition of 
crops and field 

Cutter blades? 

Adjust the gap between cutter blades 

Heavy loss in 

the reaping 

section 

Crops accumulated in the front of cutter 
blades? 

Lower the reel so that crops can flow smoothly 
from the cutter blades to the platform auger 

Header too high, or the harvested crops 
too short? 

Lower the header as crops should be 
appropriately long to be evenly conveyed to the 
platform auger 

Reel presses the crops when reverse 
harvesting? 

Adjust the reel to a proper height 

Reel stuck 

Angle of reel tines too small? 

Adjust the angle of reel tines properly 

Reel too low? 

Adjust the reel to a proper height 

Entry of clay and 

stone 

Header too low? 

Raise the header to a proper height 

 

 

 

Trouble shooting

 

99 

 

 

3. Threshing and screening section

 

 

Condition Check 

Remedy 

Crops not 

threshed 

completely 

Revolving speed of the threshing rotor too 
low? 

Check the engine tachometer, and adjust the 
accelerator lever to raise the engine speed to the 
“Green zone” 

Chaff discharge adjust lever in the “Open” 
position? 

Put the lever to “Close” side 

Insufficient feed of crops? 

Raise the harvesting speed slightly 

Crops conveyed unevenly? 

Speed up harvesting, and lower the reel 
backward if it is too near the front 

Grain splashing 

Chaff discharge adjust lever in the “Open” 
position? 

Put the lever to “Close” side 

Engine speed too high? 

Check the engine tachometer, and adjust the 
accelerator lever to raise the engine speed to the 
“Green zone” 

Angle of the chaff sieve of swing 
separator adjusted improperly?   

Adjust to an appropriate angle according to the 
crop condition 

Air volume of fan selected properly? 

Adjust correctly 

Abnormal sound 

in the threshing 

section, or 

efficiency 

decreased 

Crops wet out by dew? 

Harvest after crops become dry 

Revolving speed of the threshing rotor too 
low? 

Check the engine tachometer, and adjust the 
accelerator lever to raise the engine speed to the 
“Green zone” 

Operating speed too high? 

Reduce the existing speed of operation 

Chaff discharge adjust lever in the 
“Close” position? 

Put the lever to “Open” if the moisture content of 
rice is high 

Crops conveyed unevenly? 

Find out the cause of uneven conveying and 
remove it. 

Poor screening 

Angle of the chaff sieve of swing 
separator adjusted improperly? 

Adjust to an appropriate angle according to the 
crop condition 

Engine speed too low? 

Check the engine tachometer, and adjust the 
accelerator lever to raise the engine speed to the 
“Green zone” 

Air volume of fan, or chaff accumulated at 
the air inlet? 

Remove the chaff and other obstacles 

Air volume of fan selected properly? 

Adjust correctly 

Lots of 
damaged grains 

Grain fed properly? 

Reduce the harvesting speed in case of abnormal 
sound in the threshing section when harvesting 
speeds up. 

Crops conveyed unevenly? 

Find out the cause of uneven conveying and 
remove it. 

Angle of the chaff sieve of swing 
separator adjusted improperly? 

Adjust correctly 

Lift conveyer pipe attached with mud? 

Clean out the mud. 

Threshing rotor speed too high? 

Check the engine tachometer, and adjust the 
accelerator lever to raise the engine speed to the 
“Green zone” 

Technical specification

 

100 

 

 

Technical specification

 

 

YANMAR 

AW70V 

Model 

Top sacker 

Overall 
dimension 

Total length 

mm 

5040 

Total width 

mm 

2285 

Total height 

mm 

2865 

Total weight 

kg 

3005 

Engine Model 

number 

4TNV98 

Type 

4-cylinder, water-cooling, single-row, vertical, 4-stroke

Total displacement 

cc 

3318 

Power/rev. Kw(ps) 

51.5 

(70.0)/2500rpm 

Fuel Diesel 

fuel 

Fuel tank capacity 

L 

80 

Starting mode 

Electric starting 

Traveling 
section 

Track 

Width×grounding 
length 

mm 

425×1660 

Center distance 

mm 

1170 (between SP, 1185） 

Average grounding 
pressure 

kPa 

20.9 

Mode of speed regulation 

HST hydraulic reversing clutch 

Shift gear 

- 

3 gears 

Traveling speed 
(under the rated engine 
speed) 

m/sec Low: 

0~0.93 

Standard:  0~1.50

 

High:  0~1.85 

Min. ground clearance 

mm 

245 

Header 

Gap at the front end of crop 
divider 

mm 

2060 

Type of harvesting device 

Reel× feeder house 

Cutter blade width 

mm 

1975 

Stubble range 

mm 

-50~1000 

Reel 

Diameter×width mm 

900×1920 

Revolving speed 

rpm 

43 (37) 

Threshing 
section 

Type Axial-flow 

type

 

longitudinally mounted front roller 

Roller Diameter×length mm 

640×1850 

Revolving speed 

rpm 

570(19m/s) 

Mode of screening 

Vibration, air blast 

Screening width 

mm 

850 

Screening plate      width×length 850×1410 
Mode of secondary reduction 

Grain conveying pipe and vibrating screen 

Concave screen area 

m

2

 1.75 

Mode of threshing 

2nd outlet of grain bin 

Capacity of main grain tank 
or bin 

L 

490 

Other devices 

Alarm and automation equipment 

Water temperature, hydraulic pressure, recharging, 

secondary alarm and full grain tank 

Operating efficiency (calculated value) 

ha/hr 

0.2 – 0.6 



 

Specifications in this catalogue are subject to change without further notice.