J&M 220 Operating And Maintenance Manual - page 32

MODEL 220 

HYDRAULIC 

IMPACT HAMMER 

III. OPERATING 

INSTRUCTIONS 

K.  HOT & COLD WEATHER OPERATION 

Field experience has shown that certain modifications to normal operating 

procedures can improve hammer performance in hot or cold weather.  Use the 

following procedures in hot weather: 

1.  DO NOT set engine RPM any higher than is necessary to achieve useful 

penetration or stroke length.  Excessive RPM (oil flow) generates heat. 

2.  Observe the Drive Pressure Gage while the hammer is operating.  The pressure 

should approach the relief valve setting only momentarily when the ram impacts 

the pile.  If the pressure is observed to remain at, or near, the relief valve setting 

for a prolonged portion of the operating cycle, reduce engine RPM. 

3.  When operating at short stroke, reduce engine RPM as far as possible. 

4.  Be sure that the engine water/anti-freeze ratio is in the recommended range.  

insufficient or excessive anti-freeze will reduce the cooling capacity of the 

radiator. 

5.  Check coolant level regularly and keep full. 

6.  Be sure that the power unit main relief valve is set at the maximum allowable 

setting. See Section IV-M. 

7.  Check the engine radiator and oil cooler often and carefully for dirt, dust or 

debris.  Blow out cooler and radiator with air or a pressure washer whenever a 

build up is observed to maintain maximum cooling efficiency. 

8.  Be sure that adjacent structures or equipment are not obstructing air flow into or 

out of the power unit. 

III-7