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).
Insuffi cient air or water
Low gpm supply from power unit.
High back-pressure.
Couplers or hoses blocked.
Orifi ce plug blocked.
Fluid too hot (above 140°F/60°C) or too cold
(below 60°F/16°C).
Relief valve set too low.
Hot fl uid going through tool.
Lower piston or drive hex seal failure.
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.
Insuffi cient air or water.
Mechanical binding during drilling.
Check power unit for proper fl ow 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 inpsect for damaged parts.
Check power unit for proper fl ow 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 fl uid temperature
(130°F/55°C).
15-25 cfm/7-12 liters per second minimum required.
Check power unit for proper fl ow
(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 fl uid temperature. Bypass
cooler to warm the fl uid or provide cooler to maintain
proper temperature.
Adjust relief valve to 2100-2250 psi/145-155 bar.
Check power unit. Be sure fl ow rate is not too high
causing part of the fl uid to go through the relief valve.
Provide cooler to maintain proper fl uid temperature
(140°F/60°C max).
Check the relief valve setting.
Replace seals.
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.
13
REMEDY