Troubleshooting - Stanley SK47 User Manual

PROBLEM
Tool does not run.
Tool does not drill effectively.
Tool operates slow.
Tool gets hot.
Fluid leakage on drill steel.
Fluid leakage through charge
valve cap.
Fluid leakage around trigger.
Low rotation torque.

TROUBLESHOOTING

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