Stanley Hardware Automobile Parts BR40 User Manual

Tool does not run.

Power unit not functioning.

Check power unit for proper flow and 

pressure (4–6 gpm/15–23 lpm, 1300–

2000 psi/90–140 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 hit effectively.

Power unit not functioning.

Check power unit for proper flow and 

pressure (4–6 gpm/15–23 lpm, 1300–

2000 psi/90–140 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).

Tool operates slow.

Low gpm supply from power unit.

Check power unit for proper flow (4–6 

gpm/15–23 lpm).

High backpressure.

Check hydraulic system for excessive 

backpressure (over 200 psi/14 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. eliminate flow control devices.

Fluid leakage on tool bit.

Lower piston seal failure.

Replace seal.

Fluid leakage around trigger.

Valve spool seal failure.

Replace seals.