Maintenance
Series 505G2 SilentFlo™ Hydraulic Power Unit 65
l Hold the hose valve assembly still when taking a sample.
l Do not let the hose sample assembly line touch the mouth of the bottle or go into the bottle.
Prerequisite
You will need a hydraulic fluid sampling kit (part number 055-589-601).
Procedure
Take a fluid sample from the reservoir to get a visual indication of the fluid level and relative
contamination. Clean hydraulic fluid is clear and has an amber color. If the composition of the fluid
appears to have changed, obtain a sample of the hydraulic fluid from the sample port and check the
fluid qualities.
Control Manifold
1. Operate the HPU until the hydraulic fluid is at normal operating temperature (about 30
minutes).
2. Close the needle valve. Connect the hose valve assembly to the sample port located on the
hydraulic manifold on top of the HPU. (See illustration.)
3. Open the needle valve on the hose valve assembly and flush 1 liter (1 quart) of hydraulic fluid
though the sampling assembly. This fluid can be directed to a waste container or back into the
HPU reservoir.
4. Obtain a sample of the hydraulic fluid after flushing the valve hose assembly.
A. Without closing the valve, quickly place the sample bottle into the fluid stream (keep
the sample bottle sealed until the sample is to be taken).
B. Fill the sample bottle (175 mL/6 oz) with fluid.
C. Close the valve on the hose valve assembly and cap the sample bottle.
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