OPERATING INSTRUCTIONS RH 90 C E

Inspection and servicing

Examples of system sections:

1)working hydraulics

2)servo control circuit

3)precharged return-flow line

Depressurizing

Park the excavator on a horizontal surface.

Set the working equipment on the ground. Switch off the electric motor.

Do not switch off the electrical system

Sections 1 and 2: servo control and working hydraulics

- Shift both control levers repeatedly into all dIrections (Fig. 3-36:).

Checking the hydraulic oil level

Bring hydraulic oil to operating temperature (abt. 50 °C).

Park the machine on a horizontal surface. Move all hydraulic cylinders to their central positions.

The oil level must lie between the ½ and ¾ marks of the inspection glass (1, Fig. 3-37:).

Section 3: return-flow line

After switching off the electric motor, the precharging pressure decreases rapidly through the precharging valve. No measures are required before opening the return-flow line.

The hydraulic oil level is monitored by the BCS. The BCS displays a warning on the screen (Fig. 3-38:) if the hydraulic oil level is too low or too high.

Switch off the electric motor, locate cause and rectify.

Operating Instructions Rh 90 C E

Inspection and servicing

Stand working equipment on the ground as shown on the sign (Fig. 3-39:).

Sign (2, Fig. 3-40:) is attached beside the level indicator tube (1).

Hydraulic oil can also be filled inby means of the service station (Fig. 3-42:) (optional).

Unscrew cap of express coupling (10). Connect filling hose express coupling of the service vehicle.

The use of the hose line is described in the "Hose line for oil changes" section.

Fill in hydraulic oil until the oil level lies between the ½ and the ¾ marks of the inspection glass (1, Fig. 3-40:) (oil grade cf. "Refilling quantities - Oil").

Unscrew the hose line; the express coupling closes automatically.

Screw protective cap back in place.

Fill in hydraulic oil through the return-flow filters. Remove cover (19, Fig. 3-41:). abnehmen. Fill in hydraulic oil through the opening until the oil level lies between the ½ and the ¾ marks of the inspection glass (oil grade cf. "Refilling quantities - Oil").

Before fitting the cover (19), check the sealing ring and replace, if damaged.

Fit cover together with sealing ring.