Wacker Neuson RD 16, Operator'S Manual, Page: 80 / 244

Maintenance RD 16
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4.17 Changing the Hydraulic Oil & Filter
Set all controls in neutral, stop the engine, and allow the engine and fluids
to cool before performing this procedure.
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.
4.17.1 Remove the filler cap/filter cartridge from top of the hydraulic tank.
4.17.2 Remove the drain plug on the drain hose and allow the hydraulic fluid
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.
4.17.3 Unscrew the return line filter and replace the filter cartridge.
4.17.4 Install the drain plug on the drain hose.
4.17.5 Fill the hydraulic tank through the filler port with clean hydraulic fluid.
4.17.6 Bleed the hydraulic system. See section Bleeding the Hydraulic
System.
4.18 Bleeding the Hydraulic System
4.18.1 Fill the hydraulic system with clean hydraulic oil until it is visible at the
middle level or higher in the sightglass. Do not re-use used hydraulic
oil.
4.18.2 Disconnect the wire located on the fuel solenoid.
4.18.3 Crank engine 5–10 seconds. This will allow the oil to fill the inlet lines.
4.18.4 Reconnect the fuel solenoid wire.
4.18.5 Place forward/reverse control in the NEUTRAL position. Start the
engine and run the machine at idle for 3–4 minutes.
4.18.6 With the engine still running at idle, move the machine slowly back and
forth from forward to reverse for a short time to bleed air trapped in
drive circuit.
4.18.7 Switch the engine to high idle for 15–20 seconds. Return to low idle for
1 minute. Repeat 2–3 times to bleed the remaining air from the
hydraulic lines.
4.18.8 Check the hydraulic oil level and add oil as required.
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.