SK47 User
Manual ◄ 15
PROBLEM
CAUSE
SOLUTION
Tool does not run.
Power unit not functioning.
Check power unit for proper flow and pressure
(7–9 GPM/26–34 LPM, 1500–2000 psi/105–140
bar.
Couplers or hoses blocked.
Remove restriction.
Pressure and return line hoses
reversed at ports.
Be sure hoses are connected to their proper
ports.
Mechanical failure of piston or
automatic valve.
Disassemble breaker and inspect for damaged
parts.
Tool does not drill effectively.
Power unit not functioning.
Check power unit for proper flow and pressure
(7–9 GPM/26–34 LPM, 1500–2000 psi/105–140
bar.
Couplers or hoses blocked.
Remove restriction.
Low accumulator charge (pressure
hose will pulse more than normal).
Recharge accumulator. Replace diaphragm if
charge loss continues.
Fluid too hot (above 140 °F/60 °C).
Provide cooler to maintain proper fluid
temperature (130 °F/55 °C).
Insufficient air or water.
15–25 cfm/7–12 liters per second minimum
required.
Tool operates slow.
Low GPM supply from power unit.
Check power unit for proper flow (7–9 GPM/26–
34 LPM).
High back-pressure.
Check hydraulic system for excessive back-
pressure (over 250 psi/17 bar).
Couplers or hoses blocked.
Remove restriction.
Orifice plug blocked.
Remove restriction.
Fluid too hot (above 140 °F/60 °C) or
too cold (below 60 °F/16 °C).
Check power unit for proper fluid temperature.
Bypass cooler to warm the fluid or provide cooler
to maintain proper temperature.
Relief valve set too low.
Adjust relief valve to 2100–2250 psi/145–155
bar.
Tool gets hot.
Hot fluid going through tool.
Check power unit. Be sure flow rate is not too
high causing part of the fluid to go through the
relief valve. Provide cooler to maintain proper
fluid temperature (140°F/60°C max). Check the
relief valve setting.
Fluid leakage on drill steel.
Lower piston or drive hex seal failure. Replace seals.
Fluid leakage through charge
valve cap.
Upper piston seal failure or
accumulator O-ring failure or
accumulator charge loss or failure.
Replace seals, recharge or replace accumulator
diaphragm.
Fluid leakage around trigger.
Valve spool seal failure.
Replace seals.
Low rotation torque.
Motor not completely broken in.
Continue operation to break in motor.
Excessive oil temperature causes
operating pressure loss.
Provide cooler to maintain oil temperature
(under 140 °F).
Damage to motor clearances.
Repair as required.
Insufficient air or water.
15–25 cfm/7–12 liters per second minimum
required.
Mechanical binding during drilling.
Take care to guide drill straight.
TROUBLESHOOTING
