MKT V-22/HP-380T4, Operating, Maintenance And Parts Manual, Page: 40 / 73

HYDRAULIC LOCKING CAISSON CLAMPS ADJUSTMENT
READ THESE INSTRUCTIONS COMPLETELY BEFORE ATTEMPING TO ADJUST CAISSON CLAMPS ON
BEAM
Connect all hydraulic hoses to power unit.
Suspend the vibratory pile driver vertically with bottom of clamp assemblies resting on a solid surface.
Clean the lower sliding surfaces of the caisson beam to allow the clamp assemblies to slide without
debris getting between the clamp assemblies and the caisson beam.
Start engine and allow to run at a low idle.
1) Operate the clamp open / close switch to the open position and hold in the OPEN position.
Verify that the clamping jaws have completely opened. It may take 10 seconds or more for the
jaws to completely retract. Return clamp selector switch to the center position.
2) Locate the LOCKING VALVE located on the hydraulic clamping assembly. See picture below.
Open the locking valve by turning the knob counter clockwise (when viewed from above).
The weight of the vibratory pile driver resting on the clamp assemblies will retract the locking
pistons to in to the caisson clamp housing. The clamps should now freely slide on the caisson
beam.
NOTE: BEAM SURFACES MUST BE CLEAN WITH NO DEBRIS TO ALLOW CLAMPS TO
SLIDE FREELY. CLAMPS SHOULD SLIDE FREELY ON BEAM WHAN RELEASED.
DO NOT HAMMER ON CLAMP ASSEMBLY TO MOVE THEM.
THE CLAMP ASSEMBLY CAN BE EASILY MOVED WITH A “COME A LONG”.
3) Slide clamp assemblies into desired position, making sure to center that clamps on the beam.
4) With the clamps located in the desired position, HAND TIGHTEN ONLY the lock valve knob by
turning the knob of the lock valve clockwise (when viewed from above) until snug.
NOTE. Use of pliers or excessive force to tighten lock valve will damage lock valve
sealing seat and cause damage to caisson clamp assemblies
5) With all personal clear of caisson clamping assemblies, and engine running at an idle, move the
clamp open / close selector switch to the close position.
NOTE: THE CLAMPING JAWS WILL BEGIN TO CLOSE, VERIFY THAT ALL PERSONAL
AND TOOLS ARE CLEAR OF THE CLAMPING JAW AREA.
WITH LOCKING VALVES KNOBS SNUGGED CLOSED, ANY TIME THE CLAMP IS CLOSED, THE
CLAMPS WILL LOCK IN POSITION TO THE CAISSON BEAM AND SHOULD STAY LOCKED UNTIL
RELEASED AS OUTLINED IN STEP 1.
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