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CD12 User Manual ◄ 15
When diagnosing faults in operation of the grinder, always check that the hydraulic power source is supplying the
correct hydraulic ow and pressure to the grinder as listed in the table. Use a owmeter known to be accurate.
Check the ow with the hydraulic oil temperature at least 80 °F/27 °C.
Problem Cause Solution
Tool will not start Power not being supplied. Make sure the hoses are connected
and the couplers are tight.
Turn the hydraulic system control
valve ON.
Defective quick-disconnect. Check each disconnect separately.
Replace as necessary.
Jammed motor. See your authorized dealer for
service.
Low drilling torque. Incorrect hydraulic ow. Check that the hydraulic power source
is producing 7-9 gpm/26-34 lpm at
950-2000 psi/66-138 bar.
Defective quick-disconnect. Check each disconnect separately.
Hydraulic circuit relief set too low. Set relief valve at 2100 psi/145 bar.
Fluid restriction in hose or valve.
Excess back-pressure.
Locate and remove obstruction.
Hoses too restrictive. Fluid not warmed up. Preheat system.
Hydraulic uid is too thick. Hoses too long for hose ID. Use
shorter hose. Use larger ID hose.
Too low slip clutch torque. Inspect and replace slip clutch
washers if necessary. Set torque to
45 ± 1.5 Nm/ 33 ± 1 ft-lb. See your
authorized service dealer for repair.
Over-feeding the drill. Do not overload drill to avoid wear of
slip clutch.
Tool runs too fast. Incorrect hydraulic ow. Check that hydraulic power source is
not producing over 8 gpm/30 lpm at
950-2000 psi/66-138 bar.
Fluid leak between motor and
valve housing.
Motor capscrews loose. Tighten to recommended torque (10
Nm = 7.5 ft-lb).
Motor O-rings worn. See your authorized dealer for repair.
Motor cap/main housing damaged. See your authorized dealer for repair.
Fluid leaks at control valve. Damaged O-rings. See your authorized dealer for repair.
Wrong hydraulic uid. Circuit to hot. See Operation section for correct uid/
circuit specications.
Hydraulic pressure and return hosed
reversed.
Correct hose connections.
TROUBLESHOOTING