Enabling the Removal Device for the Counterweight
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| Illustration 1 | g02161045 |
Upper left side of pump compartment (toggle switch, lever, and ball valves) (A) CLOSED position (B) OPEN position (2) Ball valve (3) Ball valve (5) Lever (23) Toggle switch | |
The hydraulic activation control lever must be in the LOCKED position in order to activate the counterweight removal circuit. Ball valves (2) and (3) must be in the OPEN position. The counterweight removal circuit is enabled by toggle switch (23) .
Counterweight Lower Operation
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| Illustration 2 | g02160884 |
Counterweight LOWER operation (1) Control valve (2) Ball valve (3) Ball valve (4) Counterweight lifting cylinder (5) Lever (6) Check valve (7) Relief valve (8) Valve (9) Valve (10) Solenoid valve (11) Line (load sensing signal) (12) Line (13) Main control valve (14) Pilot manifold (15) Return line (16) Line (pump oil delivery) (17) Ball resolver valve (18) Hydraulic tank (19) Pilot pump (20) Pilot oil supply line (21) Front pump (22) Rear pump | |
Toggle switch (23) energizes solenoid valve (10). Solenoid valve (10) shifts valve (9). Oil from front pump (21) flows through line (16) and through valve (9) to control valve (1) .
Pump oil also flows through line (11) to main control valve (13). The load sensing signal flows into ball resolver valve (17) and through the load sensing circuit for the pumps. This signal regulates the flow from front pump (21) .
When lever (5) is pulled DOWN, control valve (1) shifts for the counterweight LOWER operation. Pump oil flows through check valve (6) and control valve (1) to rod end of lift cylinder (4). Oil flows through ball valve (3) to open valve (8). Oil drains from the head end of lift cylinder (4) and flows through valve (8), ball valve (2), and control valve (1). The oil flows through control valve (1) and line (15) to hydraulic tank (18). The counterweight is lowered.
The pressure for the counterweight removal circuit is regulated by relief valve (7) .
Counterweight Raise Operation
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| Illustration 3 | g02161337 |
Counterweight RAISE operation (1) Control valve (2) Ball valve (3) Ball valve (4) Counterweight lifting cylinder (5) Lever (6) Check valve (7) Relief valve (8) Valve (9) Valve (10) Solenoid valve (11) Line (load sensing signal) (12) Line (13) Main control valve (14) Pilot manifold (15) Return line (16) Line (pump oil delivery) (17) Ball resolver valve (18) Hydraulic tank (19) Pilot pump (20) Pilot oil supply line (21) Front pump (22) Rear pump (24) Check valve | |
Toggle switch (23) energizes solenoid valve (10). Solenoid valve (10) shifts valve (9). Oil from front pump (21) flows through line (16) and through valve (9) to control valve (1) .
Pump oil also flows through line (11) to main control valve (13). The load sensing signal flows into ball resolver valve (17) and through the load sensing circuit for the pumps. This signal regulates the flow from front pump (21) .
When lever (5) is pulled UP, control valve (1) shifts for the counterweight RAISE operation. Pump oil flows through check valve (6), control valve (1), and ball valve (2) to valve (8). Oil pressure opens check valve (24) in valve (8) and flows to the head end of lift cylinder (4). Oil drains from the rod end of lift cylinder (4) and flows through valve (1) and line (15) to hydraulic tank (18). The counterweight is raised.
The pressure for the counterweight removal circuit is regulated by relief valve (7) .