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16 ► HD01 User Manual
PROBLEM CAUSE SOLUTION
Drill operates in only one
direction. Forward or
reverse.
Reverse spool incorrectly installed. Do not separate modules. Reassemble. See
Service section.
Reverse spool faulty. Do not separate modules. Replace reverse
spool. See Service section.
Tool hose ow is reversed. Tool must not be reversed by reversing hose
ow. The tool is only designed for ow as
indicated by the designations cast on the
housing.
Drill runs too fast. Impact
mechanism or screws
broken.
Incorrect hydraulic ow. Check the hydraulic power source is not
producing over 9 gpm/34 lpm at 750–2000
psi/53–140 bar.
Hydraulic ow 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 lter directly.
Priority valve faulty. Do not separate modules. Remove, inspect and
replace priority valve if necessary. See Service
section.
Trigger operation erratic.
Control difcult.
Trigger mechanism and strut area
blocked by debris.
Do not separate modules. Clean trigger area.
See Service section.
Fluid leaks at housing seam. Motor screws loose. Separate modules. Tighten to recommended
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 uid. Circuit too hot. See Operation section for correct uid/circuit
specications.
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 section.
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 uid going through tool. Adjust ow for 9 gpm/34 lpm maximum.
Circuit is generating high heat with ow
controls.
Use pump size and rpm for producing needed
ow only. Eliminate circuit heating causes.
Circuit has contaminants that have
caused wear and high heat generation.
Replace worn pump and valves. Install a large
clean lter and keep the uid clean.
TROUBLESHOOTING