J&M 220 Operating And Maintenance Manual - page 31

MODEL 220 

HYDRAULIC 

IMPACT HAMMER 

III. OPERATING 

INSTRUCTIONS 

 F. 

STARTING 

THE 

HAMMER 

After choosing the desired stroke setting, the hammer is started by turning the 

FORWARD-REVERSE switch to the FORWARD position.  The hammer will 

continue to run as long as the switch is in the FORWARD position. 

 G. 

STOPPING 

THE 

HAMMER 

The hammer is stopped by turning the FORWARD-REVERSE switch from the 

FORWARD position to the neutral position.  The hammer may be stopped at any 

point in its cycle. 

 H. 

SINGLE 

BLOW 

OPERATION 

The hammer can be made to deliver a single blow or a short series of blows using 

the FORWARD-REVERSE switch.  To deliver a single blow, start the hammer as 

described above and as the ram begins to descend, turn the FORWARD-

REVERSE switch back to the neutral position.  The ram will fall, delivering a single 

blow.  The hammer may be stopped after delivering any number of blows. 

 I. 

EMERGENCY 

STOP 

When the diesel engine is running, pressing the EMERGENCY STOP button on the 

pendant, energizes the coil on the SHUTDOWN RESET.  The Sutdown Reset 

opens and the engine and the hammer are stoppped. 

J.  ENGINE SHUT DOWN 

Stop the hammer.  Allow the diesel engine to run for 5 minutes at 1500 RPM.  

Reduce engine rpm to 1000 RPM for 30 seconds.  Stop the engine by turning the 

ENGINE START switch to OFF.  The MAIN SWITCH on the control panel should be 

OFF. 

III-6