12
Fluid Restriction in hose or valve.
Excess back pressure.
continued
Troubleshooting
Low drilling torque.
continued
Fluid not warmed-up. Preheat
system.
Trigger mechanism blocked.
Do not separate modules. Clean
trigger area. Adjust trigger.
Tool runs too fast.
Priority flow control valve is
malfunctioning.
See your authorized service dealer
for replacement.
Symptom
Possible Cause
Solution
Trigger operation
erratic.
Control difficult.
Hydraulic flow reversed.
Correct the tool hoses,
IN
and
OUT
per instructions and if the power
supply valve is reversible, reconnect
the tool return hose to the oil cooler
or to the filter directly.
Incorrect hydraulic flow.
Check that hydraulic power source
is not producing over 13.2 / 50 lpm
at 950-2000 psi / 66-149 bar.
Priority valve faulty.
Do not separate modules. Remove
inspect and replace priority valve if
necessary. See your authorized
service dealer for replacement.
Hoses too long for hose I.D. Use
shorter hose.
Flow reversed through hoses.
Correct the power source control
valve position. Prevent reverse flow
by using only one port from the
valve for pressure, the return tool
hose to the cooler and the filter line.
Correct the quick-disconnect male/
female routing per instructions and
the arrows on the fittings.
Too low slip clutch torque.
Inspect and replace slip clutch
washers if necessary. Set torque to
20±1,5
Nm, 15±1 lbf.ft.
Do not overload drill to avoid wear
of slip clutch.
See your
authorized service dealer for repair.
Motor capscrews loose.
Tighten to recommended torque (10
Nm = 7, 5 lbf.ft).
Fluid leak at air
gap between motor
and valve housing.
continued
