TEI TE260, Service And Maintenance Manual

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TE260 TROUBLESHOOTING
PROBLEM
A. Drilling rate falls off quickly,
supply hoses pulsate
excessively, hoses heat up,
drill vibrates excessively
B. Drill bounces and vibrates
excessively
C. Rotation speed rapidly drops
or rotation fails to work
D. Loss of blowing air
E. Drilling rate decreases slowly
but steadily
PROBABLE CAUSES
High pressure accumulator has lost
pressure
Too little feed pressure
High pressure accumulator has lost
pressure
Hydraulic lines blocked
Failure of rotation motor or drill
rotation assembly
Broken shank
Lose of pressure due to leakage
Plugged drill bit
Air line to drill has been
interrupted
Dull or broken drill bits
Accumulators not charged to
correct pressures
Oil temperature to high
Hydraulic pump not maintaining
pressure
REMEDY
Recharge or replace high pressure
accumulator diaphragm or fill
valve
Adjust feed compensator relief
valve
Recharge or replace high pressure
accumulator diaphragm or fill
valve
Check hoses and fittings for leaks,
replace
Check rotation motor and rotation
assembly; replace worn parts
Replace shank; check related parts
for damage
Check hoses and fittings for leaks;
replace
Detach bit from steel and remove
obstruction;
WARNING: Do not
Hammer on Bit or Steel
Check blowing system
Sharpen bits; periodically check
for broken or loose carbides
Check charging pressures; charge
if necessary
Check hydraulic system
Check pump; replace if necessary
Section 3 Page 3-6