Stanley Black & Decker SK58 user manual Troubleshooting, Problem Cause Remedy

TROUBLESHOOTING

PROBLEM	CAUSE	REMEDY
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	Be sure hoses are connected to their proper ports.
	reversed at ports.
	Mechanical failure of piston or	Disassemble breaker and inspect for damaged
	automatic valve.	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	Recharge accumulator. Replace diaphragm if
	hose will pulse more than normal).	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.	20 cfm minimum.
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)	Check power unit for proper fluid temperature.
	or too cold (below 60 °F/16 °C).	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	Replace seals.
	failure.
Fluid leakage through charge	Upper piston seal failure or	Replace seals, recharge or replace accumulator
valve cap.	accumulator O-ring failure or	diaphragm.
	accumulator charge loss or failure.
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	Provide cooler to maintain oil temperature (under
	operating pressure loss.	140 °F).
	Damage to motor clearances.	Repair as required.
	Insufficient air or water.	20 cfm minimum.
	Mechanical binding during drilling.	Take care to guide drill straight.

SK58 User Manual ◄ 13