COUNTER BALANCE ADJUSTMENT
3203 SERIES
7-2.0.0
5/23/2003
Counterbalance Valve Adjustment
♦ With pump system disengaged and boom
properly supported, remove the plug on
the counterbalance valve. Install a
pressure gauge (0-2,500 PSI) into the
port.
♦ With no load on boom, boom up to an
angle of 70 degrees. Boom down and
note pressure. If pressure reading is not
approximately 1,000 PSI, the
counterbalance valve requires
adjustment.
v To increase the CB valve setting,
loosen nut and turn Allen head
screw counter clockwise.
v To reduce the CB valve setting,
loosen nut and turn Allen head
screw clockwise.
♦ Tighten nut on adjustment screw and
repeat procedure if needed to obtain the
proper pressure setting.
♦ Disengage pump system, remove the
pressure gauge and install plug. Crane
is now ready for operation.
Notice:
♦ In an EMERGENCY situation when it
becomes necessary to lower the boom
without flow present, the CB valve
adjustment can be turned in until the
boom begins to descend. Make sure the
boom will lower onto a proper support.
Loosen the lock nut and carefully turn
adjustment screw clockwise! Count the
number of turns.
Turn slowly until the
boom just begins to lower, and remove
hand/arm/fingers from cranes while
boom is lowering.
♦ Turning adjustment screw too far will
cause valve to come apart on the inside.
This condition is not repairable
♦ After boom is lowered, turn adjustment
screw counter clockwise the approximate
number of turns made during lowering
procedure. After the problem is
corrected, readjust the counterbalance
valve using the procedure in this manual.
WARNING:
DO NOT TRY TO ADJUST VALVES WHILE BOOM IS MOVING.
Failure to do so may result in personal injury!
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