FILLING THE CLAMSHELL (CLOSING)
LOWER THE OPENED CLAMSHELL UNTIL IT IS A FOOT ABOVE MATERIAL TO BE WORKED. RELEASE BOTH
BRAKE PEDALS SIMULTANEOUSLY AND DROP THE CLAMSHELL. CLOSE CLAMSHELL BY PULLING REAR DRUM
CLUTCH LEVER. AT THE SAME TIME CONTROL DIGGING DEPTH OF CLAMSHELL WITH FRONT DRUM CLUTCH
LEVER UNTIL IT IS CLOSED AND LOADED. TO DECREASE BITE OF CLAMSHELL, PULL FRONT DRUM CLUTCH
LEVER. THIS WILL RAISE THE BUCKET AND DECREASE THE BITE.
RAISING THE LOADED CLAMSHELL (HOISTING)
KEEP THE REAR DRUM CLUTCH LEVER PULLED BACK AND OPERATE THE FRONT DRUM CLUTCH LEVER SO
CABLES ARE TAKEN UP AT THE SAME RATE. THE. CLOSING CABLE IS THE MOST IMPORTANT AND DOES
MOST OF THE WORK. NEVER ALLOW IT TO GO SLACK OR CLAMSHELL WILL IMMEDIATELY SWING OPEN. DO
NOT USE HOLDING CABLE TO RAISE THE CLAMSHELL; THE HOLDING CABLE IS USED ONLY TO HOLD THE
BUCKET IN POSITION WHEN DUMPING. AS SOON AS BUCKET IS AT DESIRED HEIGHT, APPLY BOTH FRONT
AND REAR DRUM BRAKE PEDALS AND AT THE SAME TIME RELEASE BOTH THE FRONT AND REAR DRUM
CLUTCH LEVERS.
Figure 2-37. Clamshell operation and control positions (sheet 1 of 2).
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