SWINGING
KEEP BOTH THE FRONT AND REAR DRUM BRAKES ON WHILE SWINGING. PULL SWING CLUTCH LEVER TO
SWING TO RIGHT, PUSH TO SWING TO LEFT. ENGAGE SLOWLY SO SWING IS SMOOTH. TO STOP SWING,
ENGAGE LEVER IN OPPOSITE SWING POSITION GENTLY. SWINGING AND HOISTING CAN BE DONE
SIMULTANEOUSLY AS SOON AS BUCKET IS HIGH ENOUGH TO CLEAR ALL INTERVENING OBSTACLES.
DUMPING
KEEP THE FRONT DRUM BRAKE PEDAL FIRMLY.DEPRESSED AND AT THE SAME TIME RE- LEASE THE REAR
DRUM BRAKE PEDAL. DEPRESS THE REAR DRUM BRAKE PEDAL AND STOP THE CABLE BEFORE THE BUCKET
HALVES OPEN SO FAR THAT THEY SLAM AGAINST THE STOPS. AFTER CLAMSHELL UNLOADS, SWING THE
CRANE WITH CLAMSHELL OPEN BACK TO MATERIAL PILE. WHEN OVER THE WORKING AREA, LOWER THE
OPEN BUCKET AND REPEAT THE WORKING CYCLE.
Figure 2-37. Clamshell operation and control positions (sheet 2 of 2).
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