Continuous Hammer Operation - JUNTTAN PM 20L Operator's Manual

JUNTTAN

6.5.9.2 CONTINUOUS HAMMER OPERATION

• Check that there is no person in the machine working radius.
• Check that the hammer is resting on a pile.
• Drive cap is its top position.
• Turn the drop height dial to minimum and the dwell time to maximum.
• Turn the piling mode switch to position 2.
• To start continuous hammer operation, push the ram block single lift buttons down
simultaneously (green buttons on the left and right consoles).
• Hammer and pile winch brakes opening when continuous piling is started by
pressing single lift buttons.
• Increase the drop height as required.
• While driving continues, the dwell time should be turned back to minimum unless
there is recoil from the pile.
• On hard ground and when the pile is against rock the return stress wave makes the
ram block bounce. On such occasions you should increase the dwell time so that all
the bouncing of the ram block stops prior to the next lift.
• In order to get small drop heights switch on short stroke, turn the drop height dial to
minimum and let the engine speed drop.
• A further reduction in the drop height can be obtained by locking the hydraulic
pumps to minimum output with turtle switch on the top console. Also you can adjust
pump flow with potentiometer on the left console.
• Three ways to stop continuous hammer operation:
• 1: Turn the piling mode switch to position 1. The hammer and pile winch brakes
are close during interruption. To start continuous hammer operation again, turn
the piling mode switch to position 2 and push the ram block single lift buttons
down simultaneously.
• 2: Switch ON piling interruption switch on the left console. The hammer and pile
winch brakes are open during interruption. To start continuous hammer operation
again, switch OFF piling interruption switch.
• 3: Pull back the safety lever. The hammer and pile winch brakes are closed during
interruption. To start continuous hammer operation again, push the safety lever to
front position and push the ram block single lift buttons down simultaneously.
• When you stop hammer turn the piling mode switch to position 0.
n WARNING
Do not turn the piling mode switch to position 1 or 2 if the hammer is not resting on a
pile. Check also that there is enough slack in the ropes of the winches. If the hammer
starts working before you press the single lift buttons stop working immediately. Find
the reason for that and repair it.
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Daily operation section