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MODEL 220
HYDRAULIC
IMPACT HAMMER
II.
PREPARATION FOR OPERATION
K. VARIABLE STROKE CYLINDER PRESSURE (CONTINUED)
Disconnect the variable stroke cylinder lines (3/8" ID hoses) at the power unit quick
disconnects. 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. Observe the pressure on the clamp
gage at the control panel. If the pressure is not 1500 PSI (103 Bar), the clamp relief
valve will have to be re-adjusted to 1500 PSI (103 Bar) using the procedure in
Section IV-N of the maintenance and adjustments chapter.
NOTE: DO NOT SET THE VARIABLE STROKE CYLINDER PRESSURE BY
ADJUSTING THE CLAMP PRESSURE SWITCH.
pendant should NOT come ON.
L. FUEL, LUBRICATING OIL AND GREASE
The following are reminders for lubrication maintenance procedures that should be
performed in preparation for operation of the Model 220 hydraulic impact hammer.
See the Caterpillar engine manual and the MAINTENANCE AND ADJUSTMENTS
section of this manual for a description of these procedures.
1. Power Unit
a. Check engine oil level
b. Check hydraulic oil level
c. Check for adequate fuel supply
d. Check engine coolant level
2. Hammer
a. Grease Columns
b. Grease sheave
c. Oil trip valve lever pivot
The clamp light [q] on the
II-11
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