COMBINE HARVESTER AW70V, VNQ, AW82V, VNQ. Manual - part 23

Periodic Inspection

The spool retaining ring clearance on the upper side of
the actuator when the turning lever is fully turned down
G: 0-1 mm (both right and left side)

If dimension G is more than the specified dimension,
the following problem may occur.
- Turning with one of the side clutch brakes engaged

cannot be performed at an early stage.

[Note]
Be sure to lock with the nut.

4. Clearance adjustment between the SC lever and

the machine bolt attached at the bottom of the
actuator.

The clearance between the machine bolt and the SC
lever while taking the play in the SC lever at the bottom.
J: 0-0.5 mm (both right and left)

[Note]


Make sure that dimension J is not a minus value.

(SC lever is being pushed.)



Be sure to lock with the nut.

If dimension J is more than the specified dimension, the
following problem may occur.- Turning with one of the
side clutch brakes engaged cannot be performed at an
early stage.

If dimension J is a minus value, the following problem
may occur.
- Parts inside the transmission become worn
- Transmission oil temperature increases

5. Checks after adjustment



Machine turns with one of the side clutch brakes

engaged (inner crawler stops) when the turning
lever is fully pushed down. (Both right and left)



Turning with one of the side clutches disengaged,

gradual turning, or turning with one of the side
clutch brakes engaged, can be performed
depending on the pushing angle of the turning
lever. (Both right and left)



The response that the operator receives from the

right and left sides is the same.



Nut is not loose and adjustment is not displaced

after the test operation.

Lock nut

Machine bolt

SC lever

SC lever play
direction

Periodic Inspection

22. Checking and adjusting the
crawler

Jack up the chassis and the lower part of transmission
to adjust the gap between the 4th track roller and the
crawler to 12.5±2.5mm.

<Adjusting>
Jack up the machine on a level ground. The jack
capacity must be over 3 tons. Support the chassis
(pipe) , left and right sides of chassis.

Add a buffer (wood plank) between the jack and
transmission

<Adjusting>
1- Remove the adjust nut stopper.
2- Loosen the lock nuts.
3- Turn the adjusting nut to set the gap.

[Precaution]

Do not tension the crawler too tight (gap below 12.5±
2.5mm)

The crawler will be lengthened within a short time if it is
excessively tensioned. As a result, the gap between the
driving sprocket and the crawler will be widened, and
the crawler iron core may be in contact with the driving
sprocket, causing abnormal wear and damage.

Left side of chassis

Right side of chassis

Gap

Tension

bolt

Adjusting

nut

Periodic Inspection

<Crawler structure>

<Common damages and failures of the crawler and the causes>

●

-Most related ▲-Related

Cause

Damage/failure

Tension of

crawler

Driving

method

Road

condition

Poor

cleaning/

maintenance

Poor storage

Iron core wear, breakage and

fall-off

▲

●

▲

Rib/projecting part damage

●

Damage of crawler inner side

▲

●

▲

Fatigue/damage of each parts

●

Wire cord breakage

▲

●

Driving sprocket wear

●

▲

Track roller / idler roller wear

▲

Insufficient traction

▲

Crawler falling off wheel

●

▲

Driving

sprocket hole

Retaining wheel
projection

Rubber

Inner side of crawler

Grounding side

of crawler

Wire code

Iron code

Rib (protection)

Periodic Inspection

<Main causes of crawler damage>



Traveling/moving along steps or ridges



Traveling over bridge.



Traveling on roads with sharp bumps (steel bar,
stone etc.).

[Other precautions]



Operating temperature -20℃~55℃.



Chemicals, oil and salt in sea water may damage the track.



It is prohibited to climb up steps or cross deep ditches directly. Any steps or deep ditches should be leveled with
soil or wood.



It is prohibited to drive obliquely on a slope to prevent accidents caused by the crawler running off the rails.



It is prohibited to turn abruptly during traveling at a high speed. Otherwise, the crawler may fall off the rails and
cause accident.



It is prohibited to travel on roads in a long distance. Use a truck or other vehicles for long-distance traveling.



It is prohibited to use any ramp boards without anti-skid measures.



Check the crawler tension on a regular basis for timely adjustment. Otherwise, wear of the driving sprocket and
iron core of the track may be early.



Check the wear condition of driving sprocket, idler wheel and track roller, and replace when necessary to
prevent damage and crack of the crawler.



Try to avoid crossing the ridge or ditch during field operation, so as to prevent damage and crack of the crawler.



Timely remove the mud, straw and other foreign matters stuck in the crawler if any. Otherwise, the traveling
resistance may be increased.



Reducing the power may lead to crawler crack, inner side scratch and early wear of the driving sprocket.



The track must be correctly tensioned. It may run off the rails if it is tensioned too loosely, or break if tensioned
too tight. In case of abnormal wear of the driving sprocket, the crawler core may be drawn out and lead to
crawler damage, as shown below.

[Note]
The driving sprocket should be replaced if the dimension measured by the calipers shown above is <20mm.

Wear condition of driving sprocket

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