OPERATING INSTRUCTIONS RH 120 E

Inspection and servicing

Pump transfer gearbox lube oil filters

Check filter tell-tales (1, Fig. 3-79:) regulary - at operating temperature - for indication of contamination.

If the red sector is visible through transparent cap (2), the filter element must be cleaned or changed.

Filter element (5) must be changed after having been cleaned 8 - 10 times; at the latest however, after 1000 operating hours.

Remove flange (3, Fig. 3-80:).

Pour oil out of filter pot (4) and remove filter element (5).

Clean filter element in spirits or petroleum; change if damaged

Clean filter head (6, Fig. 3-79:) and filter pot (4). Check o-ring (7, Fig. 3-80:) for damage; change if necessary.

Oil the o-ring lightly. Place filter element into filter pot and re-assemly.

Check filters for leakages after recommencing operation.

Operating Instructions

Inspection and servicing

Slewing Gearbox

Read and observe: "Inspection and servicing - Safety instructions.

Switch off the electric motor

The gearbox housings may be hot, too. Secure the machine as described in the "Securing the machine" section.

Protect the skin from contact with gearbox oil. Skin contact with cooling liquid is a potential health hazard.

Wear protective gloves and firm working clothing.

Changing the gearbox oil

Draining off oil

Prepare a collecting recipient for used oil. Choose the required capacity in accordance with the "Refilling quantities - Oil" table.

Gearbox - Checking the oil level / Topping up with oil

Park the machine as described under "Securing the machine".

Check the oil level visually at expansion tanks (6, Fig. 3-81:). The expansion tanks must be filled with gearbox oil up to abt. 1/3

The oil level is visible from outside (light/dark area).

Hose (5, Fig. 3-81:and Fig. 3-82:) connects the gearbox (3, Fig. 3-82:) with the expansion tank (6, Fig. 3-81:).

Unscrew protective cap from the automatic drain valve

Attach hose (8, Fig. 3-82:) to drain valve (7) and drain off oil completely. Unscrewing cover (8, Fig. 3-81:) facilitates draining off used oil.

The hose line and its use are described in the "hose line for oil and cooling liquid change" section.

Operating Instructions Rh 120 E

Inspection and servicing

Drain valve (7, Fig. 3-83:) is accessible from the undercarriage.

Remove hose. The oil drain valve closes automatically.

Screw on protective cap.

Gearbox venting

The gearbox is vented through cap (8, Fig. 3-84:).

Filling in new oil / Topping up

Unscrew cap (8, Fig. 3-84:) and fill in new oil through expansion tank (6). The expansion tank (6) must be filled with gearbox oil up to abt. 1/3

Operating Instructions

Inspection and servicing

Travel Gearbox

Read and observe: "Inspection and servicing - Safety instructions.

Shut off the engines

The gearbox housings may be hot, too. Secure the machine as described in the "Securing the machine" section.

Protect the skin from contact with gearbox oil. Skin contact with cooling liquid is a potential health hazard.

Wear protective gloves and firm working clothing.

Gearbox - Checking the oil level / Topping up with oil

Move the excavator into such a position that the screw plugs (1, 2 and 3, Fig. 3-85:) are in the displayed position.

Unscrew checking screw (1). The oil level should reach up to the lower edge of the opening. Top up with oil, if required.

Screw checking plug (1) back in place.

Pre-chamber - Check the oil level / Top up with oil

Unscrew control plug (2,(Fig. 3-86:). The oil level should reach up to the lower end of the opening. Top up with oil through the opening if required.

Screw in plug (2) back in place.

Brake chamber - Checking the oil level / Topping up with oil

Unscrew checking screw (6, Fig. 3-86:). The oil level should reach up to the lower edge of the opening. Top up with oil, if required.

Screw checking plug (6) back in place.