16
PROBLEM
CAUSE
SOLUTION
Low hammer impact or drilling torque.
(continued)
Flow reversed through hoses.
Correct the power source control valve
position. Prevent reverse fl ow by using
only one port from the valve for pressure,
the return tool hose to the cooler and the
fi lter line. Correct the quick-disconnect
male/female routing per instructions and
the arrows on the fi ttings.
Drill operates in only one direction. For-
ward or reverse.
Reverse spool incorrectly installed.
Do not separate modules. Reassemble.
See Service Instructions.
Reverse spool faulty.
Do not separate modules. Replace re-
verse spool. See Service Instructions.
Tool hose fl ow is reversed.
Tool must not be reversed by reversing
hose fl ow. The tool is only designed for
fl ow as indicated by the designations cast
on the housing.
Drill runs too fast. Impact mechanism or
screws broken.
Incorrect hydraulic fl ow.
Check the hydraullic power source is not
producing over 9 gpm / 34 lpm at 750-
2000 psi / 53-140 bar.
Hydraulic fl ow reversed.
Correct the tool hoses. IN and OUT per in-
structions and if the power supply valve is
reversable, reconnect the tool return hose
to the oil cooler or to the fi lter directly.
Priority valve faulty.
Do not separate modules. Remove, in-
spect and replace priority valve if neces-
sary. See Service Instructions.
Trigger operation erratic. Control diffi cult.
Trigger mechanism and strut area blocked
by debris.
Do not separate modules. Clean trigger
area. See Service Instructions.
Fluid leaks at housing seam.
Motor screws loose.
Separate modules. Tighten to recom-
mended torque.
Motor cap seal worn or missing.
Separate modules. Replace as required.
Motor cap/main housing damaged.
Separate modules. Replace as required.
Fluid leaks at reversing spool.
Damaged o-rings.
Do not separate modules. Replace them
as required.
Wrong hydraulic fl uid. Circuit too hot.
See Operating Instructions for correct
fl uid/circuit specifi cations.
Hydraulic pressure and return hoses
reversed.
Correct hose connections.
Fluid leak at air gap between module.
Oil leak at motor shaft seal.
Repair or replace. See Service Instruc-
tions.
Fluid gets hot. Power unit working hard.
Open center tool on a closed center circuit
or vice versa.
Use tools to match circuit.
Circuit relief set too low.
Adjust relief valve to 2100-2250 psi /
135-155 bar.
Too much fl uid going through tool.
Adjust fl ow for 9 gpm / 34 lpm maximum.
Circuit is generating high heat with fl ow
controls.
Use pump size and rpm for producing
needed fl ow only. Eliminate circuit heating
causes.
Circtuit has contaminants that have
caused wear and high heat generation.
Replace worn pump and valves. Install a
large clean fi lter and keep the fl uid clean.
TROUBLESHOOTING
Содержание HD08
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