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35
35
FAULT
Earth Drill output
shaft does not rotate
Slow digging speed /
slow rotation of Earth
Drill output shaft
Auger stalls during
work
EARTH DRILL UNIT - OPERATION
POSSIBLE CAUSE
Parent machine pressure relief
valve faulty or set too low
Earth Drill unit seized
Auger jammed in ground
Insufficient oil flow from parent
machine
Incompatible Earth Drill to parent
machine combination
Incorrect auger, boring teeth or
pilot fitted or worn boring teeth/
pilot
Worn Earth Drill hydraulic motor
possibly due to incorrect or dirty
oil supply
Parent machine pressure relief
valve faulty or set too low
Restricted oil flow
Blocked hydraulic filter
Excessive parent machine down
force on auger
Incompatible Earth Drill /
auger size / parent machine
combination
ACTION
Test, reset or replace to parent machine’s
specification
Seek advice from Avant Tecno Oy dealer
Remove auger from ground before
starting machine
Check tha parent machine hydraulic
system is operating correctly and has
sufficient oil of the correct grade
Check specification . Seek advice from
Avant Tecno Oy dealer
Ensure auger size is compatible with
Earth Drill Unit (not to large) and that
boring teeth/pilot are suitable for he
ground conditions and not worn
Seek advice from Avant Tecno Oy dealer .
Only use genuine spare parts . Change
parent machine hydraulic oil and filter
before
fitting replacement drive unit
Reset/replace pressure release valve to
parent machine’s specification
Check for damaged or incorrect hydraulic
hoses and connections
Change parent machine filter and oil
Reduce down force
Check specification . Seek advice from
Avant Tecno Oy dealer