Auto Crane 3203EH, Руководство пользователя

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9-1.0
1/27/11
3203EH
COUNTERBALANCE VALVE ADJUSTMENT
Counterbalance Valve Adjustment
1. With PTO disengaged and boom properly
supported, remove the plug on the
counterbalance valve. Install a pressure
gauge (0-3000 PSI) into the port.
2. Engage PTO and insure pump flow is 8 to 9
GPM. With no load on boom, boom up to an
angle of 70 degrees. Boom down and note
pressure. If pressure reading is not
approximately 1300 PSI, the counterbalance
valve requires adjustment.
A. To increase the CB valve setting, loosen
nut and turn Allen head screw counter
clockwise.
B. To reduce the CB valve setting, loosen
nut and turn Allen head screw
clockwise.
3. Tighten nut on adjustment screw and repeat
procedure if needed to obtain the proper
pressure setting.
4. Disengage PTO, remove the pressure
gauge and install plug. Crane is now ready
for operation.
Notice:
1. 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 clock-
wise! 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.
2. Turning adjustment screw too far will cause valve to
come apart on the inside. This condition is not repair-
able
3. After boom is lowered, turn adjustment screw counter
clockwise the approximate number of turns made dur-
ing lowering procedure. After the problem is cor-
rected, readjust the counterbalance valve using the
procedure in this manual.
WARNING:
DO NOT TRY TO ADJUST VALVES WHILE BOOM IS MOVING.
Doing so may result in personal injury!