Changing The Hydraulic Oil & Filter; Bleeding The Hydraulic System; Long-Term Storage - Wacker Neuson RD 12A Operator's Manual

RD 12A
5.14 Changing the Hydraulic Oil & Filter
5.14.1 Remove the filler cap/filter cartridge from top of the hydraulic tank.
5.14.2 Remove the drain plug on the drain hose and allow the hydraulic fluid
5.14.3 Unscrew the return line filter and replace the filter cartridge.
5.14.4 Install the drain plug on the drain hose.
5.14.5 Fill the hydraulic tank through the filler port with clean hydraulic fluid.
5.14.6 Bleed the hydraulic system. See section Bleeding the Hydraulic

5.15 Bleeding the Hydraulic System

5.15.1 Fill the hydraulic system with clean hydraulic oil until it is visible at the
5.15.2 Disconnect the spark plug wires to prevent the engine from starting.
5.15.3 Crank engine 5–10 seconds. This will allow the oil to fill the inlet lines.
5.15.4 Reconnect the spark plug wires.
5.15.5 Place forward/reverse control in the NEUTRAL position. Start the
5.15.6 With the engine still running at idle, move the machine slowly back and
5.15.7 Switch the engine to high idle for 15–20 seconds. Return to low idle for
5.15.8 Check the hydraulic oil level and add oil as required.
5.16

Long-Term Storage

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All oils eventually shear or thin out with use, reducing their lubricating
ability. In addition, heat, oxidation, and contamination may cause the
formation of sludge, gum, or varnish in the system. For these reasons,
it is important to change the hydraulic oil at specified intervals. See
Maintenance Schedule.
to drain.
Note: In the interests of environmental protection, place plastic
sheeting and a container under the machine to collect the liquid which
drains off. Dispose of this liquid properly.
System.
middle level or higher in the sightglass. Do not re-use used hydraulic
oil.
engine and run the machine at idle for 3–4 minutes.
forth from forward to reverse for a short time to bleed air trapped in
drive circuit.
1 minute. Repeat 2–3 times to bleed the remaining air from the
hydraulic lines.
Note: If the drive pump chatters or operation is noisy, turn the machine
off and check for air leaks in the inlet line of the charge pump.
If machine is to be stored for more than 30 days:
65
Maintenance