Locking the Swing Brake
In addition to the positive locking of the upper carriage by means of a bolt, which connects the swing upper carriage with the undercarriage in or opposite to the direction of travel (for transport and long traveling distances), the upper carriage can be non-positively locked against the undercarriage in any position.
Depress pedal (2, Fig. 513) and simultaneously turn the shutoff valve (4, Fig. 776) through 90°. The hydraulic pressure maintained between the wheel cylinder of the swing brake and the shutoff valve immobilizes the upper carriage. However, locking depends on the amount of leakage of the shutoff valve. Repeat locking procedure if necessary.
| NOTICE |
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Do not counteract machine movement with the swing control lever while simultaneously operating the swing brake pedal (2, Fig. 513). |
Throttle Relief Valve for Lift and Main Boom Cylinders
Lift Cylinders (1, Fig. 520)
The throttle relief valve controls the lowering speed. Turning as indicated by the arrow reduces the lowering speed. Turning against the arrow increases the lowering speed.
Main Boom Cylinder (2, Fig. 520)
The function is the same as for the lift cylinder valve, although this valve is used to adjust the speed for the extension of the cylinder (with the lift cylinders, retraction speed).
The speed is reduced by turning in the direction of the arrow. Speed is increased by turning against the arrow.
| NOTICE |
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Do not close the throttle relief valves too far, otherwise the hydraulic fluid may overheat. |
Electrical Fuel Lift Pump (If Equipped)
The fuel lift pump shown in Fig. 522 is used for filling of the diesel fuel tank.
After connecting an appropriate filling hose to the socket (2, Fig. 522), insert the hose into a fuel barrel or other container.
Pull the switch (1, Fig. 522) and start the electric pump.
Check the level in the fuel tank by means of the inspection glass fitted in the fuel tank wall (Fig. 523) or in the fuel gauge in the operator's cab.
The switch (1, Fig. 522) must be pushed in to stop the filling procedure.
| NOTICE |
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The pump is only suitable for diesel fuel. |
Optional Hydraulic Attachment Function (If Equipped)
The optional hydraulic attachment function is required if another actuator must be manipulated, e.g., for hydraulic clamshell rotation.
To use the additional actuator (for rotation) first turn the shutoff valves (1, Figs. 524 and 777) through 90° as shown by arrow (the valves are now closed). This cancels the rapid traverse function for the main boom (retract main boom).
The free valve is now used to move the additional actuator by way of the swing control. Depression of the push button and simultaneous operation of the swing control to left or right, actuates rotate left or rotate right.
NOTE: If the push button is released while the swing control continues to be held left or right, the additional actuator does not function and the swing gear mechanism (left or right) is actuated.
- 1. Moving the swing control to left or right in conjunction with the depressed push button controls the optional actuator function (and not the swing gear mechanism).
- 2. Moving the control to left or right without simultaneously depressing the push button controls the swing gear mechanism (and not the optional attachment actuator).
- 3. Close the shutoff valves (1, Figs. 524 and 777) for the operation of the optional attachment function (turn through 90° as shown by arrow).
- 4. Open the shutoff valves (1, Figs. 524 and 777) for backhoe bucket service.
Latching the Open Tool Box Cover
When the cover of the toolbox is opened, the pin (1, Fig. 521) catches the handle automatically.
Pull the spring-loaded pin outward to close the cover.
