3-42 OM 28Z3 US – Edition 2.0 * * 28Z3b340.fm
Operation
Lowering the boom with the engine stopped
Lower the boom as follows:
☞ Make sure no one is dangerously close to the machine.
☞ Turn the starting key to position “1”.
☞ Press forward and hold the control lever (A and E).
➥ Until the arm system is completely lowered.
☞ Return the control lever to neutral
Releasing pressure
Proceed as follows:
☞ Stop the engine.
☞ Turn the starting key to position “1”.
☞ Move the control lever in all directions a few times.
➥ This releases the pressure in the hydraulic system
Rotating the upper carriage
Important!
• Until the hydraulic fluid reaches operating temperature, the upper carriage
can creep slightly after the control is placed in the neutral position.
• Fast actuation of the control lever rotates the upper carriage fast, slow
actuation of the control lever rotates the upper carriage slowly.
• If the upper carriage needs to be rotated on a slope, let the engine run at
idling speed and actuate the control lever very slowly. Proceed with
extreme care and avoid abrupt movements if the bucket is full.
Rotate the upper carriage to the left as follows:
☞ Push the left-hand side control lever 2 to the left A
➥ The upper carriage rotates to the left
Rotate the upper carriage to the right as follows:
☞ Push the left-hand side control lever 2 to the right B
➥ The upper carriage rotates to the right
Fig. 49: Lowering the arm system with the engine switched
A
E
2 3
Fig. 50: Rotating the upper carriage to the left
A
2
Fig. 51: Rotating the upper carriage to the right
2
B
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