Filter
Top Products
HD45 User Manual ◄ 15
TROUBLESHOOTING
Problem Cause Solution
Drill does not run. Power unit not functioning Check power unit for proper ow and
pressure (7–9 gpm/26–34 lpm, 1500–
2000 psi/104–140 bar).
Couplers or hoses blocked. Remove restriction.
Flow direction reversed. Pressure and
return lined hoses reversed at ports.
Be sure hoses are connected to their
proper ports.
Mechanical failure of piston or automat-
ic valve.
Disassemble drill and inspect for dam-
aged parts.
Drill does not drill effective-
ly.
Power unit not functioning. Check power unit for proper ow and
pressure (7–9 gpm/26–34 lpm, 1500–
2000 psi/104–140 bar).
Couplers or hoses blocked. Remove restriction.
Low accumulator charge (pressure
hose will pulse more than normal).
Recharge accumulator. Replace dia-
phragm if charge loss continues.
Oil too hot
(above 140 °F/60 °C).
Provide cooler to maintain proper oil tem-
perature.
Drill operates slow. Low ow supply from power unit. Check power unit for proper ow (7–9
gpm/26–34 lpm).
High backpressure. Check hydraulic system for excessive
backpressure (over 250 psi/17 bar).
Couplers or hoses blocked. Remove restriction.
Orice plug or internal passage blocked. Remove restriction.
Oil too hot (above 140 °F/60 °C) or too
cold (below 60 °F/16 °C).
Check power unit for proper oil temper-
atures. Bypass cooler to warm oil up or
provide cooler to maintain proper tem-
perature.
Relief valve set too low. Adjust relief valve to 2100–2250 psi/145–
155 bar.
Drill gets hot. Hot oil going through tool. Check power unit. Be sure ow rate is
not too high causing part of the oil to go
through the relief valve. Provide cool-
er to maintain proper oil temperature
(140 °F/60 °C maximum).
Check relief valve setting.
Oil leakage on drill bit. Lower piston or drive hex seal failure. Replace seals.
Oil leakage around trigger. Valve spool seal failure. Replace seals.
Low rotation torque.
Motor not completely broken in.
Continued operation or break in with mo-
tor break-in block will correct.
Damage to motor clearances. Repair as required.
Mechanical binding during drilling. Take care to guide drill straight.
If symptoms of poor performance develop, the following chart can be used as a guide to correct the problem.
When diagnosing faults in operation of the hammer drill, always check that the hydraulic power source is supplying
the correct hydraulic ow and a pressure to the tool as listed in the table. Use a owmeter known to be accurate.
Check the ow with the hydraulic uid temperature at least 80 °F / 27 °C.