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MODEL 220
HYDRAULIC
IMPACT HAMMER
II.
PREPARATION FOR OPERATION
J. BLEEDING THE VARIABLE STROKE CYLINDER LINES
The hammer is normally shipped with the two 3/8" hoses full of oil and the unit may
be used immediately. However, if the hoses have been removed from the hammer,
the hoses may need to be filled with hydraulic oil prior to driving operations.
Remove the hose from its fitting at the cylinder (P/N 160817) retract end. Place
and hold the end of the hose in an adequate container or bucket.
Read SECTION III - OPERATION INSTRUCTIONS
Start and warm-up the engine in accordance with SECTION III C. With the engine
warmed-up and running at 1000 rpm, turn the clamp switch, on the control pendant,
to the CLOSE position. Oil should start flowing from the hose within 20 seconds.
When the flow of oil is bubble free, return the clamp switch to the OFF position, and
stop the diesel engine.
Reconnect and tighten the hose to the cylinder.
Remove the hose from its fitting at the cylinder extend end. Place and hold the end
of the hose in an adequate container or bucket.
Start and warm-up the engine in accordance with SECTION III C. With the engine
warmed-up and running at 1000 rpm, turn the clamp switch, on the control pendant,
to the OPEN position. Oil should start flowing from the hose within 20 seconds.
When the flow of oil is bubble free, return the clamp switch to the OFF position, and
stop the diesel engine.
Reconnect and tighten the hose to the cylinder.
K. VARIABLE STROKE CYLINDER PRESSURE
The variable stroke cylinder pressure should be approximately 1500 PSI (103 Bar).
If the J&M Model 325 power unit is always used with the Model 220 hydraulic
impact hammer, the variable stroke cylinder pressure should already be properly
set. Whenever a new job is started, or when the 325 power unit has been used to
drive a vibratory driver/extractor, or when an alternate power unit is to be used, the
variable stroke cylinder pressure should always be checked before starting driving
operations.
Read SECTION III - OPERATING INSTRUCTIONS.
II-10
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