OPERATING INSTRUCTIONS RH 30 F

Inspection and servicing

Removing and installing the battery

The acid temperature must be 20 ° C.

Unscrew caps of the battery (Fig. 3-42: Measure the acid density of the battery using a commercial acid tester (Fig. 3-42: The acid density measured is in direct correlation with the battery charge.

Removing and installing the battery

Read and observe the "Inspection and servicing – Safety instructions" chapter.

Wear protective gloves and firm working clothing.

Shut off the engines before removing the batteries to avoid damaging the alternator and the regulator.

Turn key in key-switch to position "0" and withdraw.

Disconnect and reconnect the terminal clamping lugs in the prescribed order.

Disconnecting and connecting in the wrong order may cause short-circuits.

The batteries (1, Fig. 3-43:) are located behind the hydraulic reservoir. The 12-volt batteries are connected in series and in parallel, so that the system voltage is 24 volts.

Operating Instructions

Inspection and servicing

The batteries are located under the lockable hatch (arrow, Fig. 3-45:). The two 12-volt batteries are connected in series, so that the system voltage is 24 volts.

Before installing the new battery, the contact faces of the battery terminal posts and the cable lugs must be cleaned down to the bright metal.

Unscrew battery holder (6, Fig. 3-45:).

Disconnect the cable lug from the negative terminal of the battery.

Disconnect the cable lug from the positive terminal of the battery. Insulate the cable lugs.

Install the new battery.

Connect the cable lug to the positive terminal of the battery.

Tighten the clamping screw of the cable lug.

Do not use too much force to avoid deformations. Connect the cable lug to the negative terminal of the battery.

Apply special terminal grease or acid-free vaseline on the battery terminal posts and clamping lugs.

Loose or corroded clamping lugs will lead to alternator or regulator overloading.

Hydraulic System

Hydraulic system - Safety instructions

Read and observe the "Inspection and servicing – Safety instructions" chapter.

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Residual pressures disappear only gradually. If work is to be carried out on the hydraulic system immediately after the immobilization, the system must be freed from pressure, i.e. depressurized:

Before working on the hydraulic system, make sure that the system is without pressure and that the residual pressures have also been eliminated.

Shut off the engines.

Risk of burning caused by hot hydraulic components (e.g. hydraulic oil reservoir, cylinder, valves).

Secure the machine as described in the "Securing the mmachine section.

Avoid skin contact with hydraulic oil.

Contact with hydraulic oil can cause skin injury. Wear protective gloves and firm working clothing.

Depressurizing the hydraulic system

Hydraulic systems may only be opened if they are completely depressurized. Even when an excavator is parked on a horizontal surface with the working equipment resting on the ground (Fig. 3-46:and Fig. 3-47:) and with its drive engines stationary, there may still be a considerable amount of residual pressure in parts of the hydraulic system, as e.g. the primary pressure resulting from the last hydraulic movements before the immobilization.

Locate the system section to be opened.

Depressurize the section to be opened. If required, the necessary measures described must be combined

Open the depressurized system section with caution.

Examples of system sections:

1)working hydraulics

2)servo control circuit

3)precharged return-flow line

Operating Instructions

Inspection and servicing

Depressurizing

Park the excavator on a horizontal surface.

Set the working equipment on the ground. Shut off the drive engine.

Sections 1 and 2: servo control and working hydraulics

- Shift both control levers repeatedly into all dIrections (Fig. 3-48:).

Topping up with hydraulic oil

Remove cover (20, Fig. 3-50:) and retaining disk (23).

One of the return-flow filters is now visible in the filter chamber.

Fill in hydraulic oil through this return-flow filter until the oil level lies between the ½ and ¾ marks of the inspection glass (oil grade cf. "Refilling quantities - Oil").

Section 3: return-flow line

After shutting down the engine, the precharging pressure decreases rapidly through the precharging valve. No measures are required before opening the return-flow line.

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. 3-49:).

Before fitting retaining disk (23) and cover (20), check sealing ring (26) and replace if damaged.

Fit cover together with sealing ring.