MTS Series 505 SilentFlo Hydraulic Power Unit Model 505-30 - Manual (Page 60)

Model 505.20 - 505.30 SilentFlo™ HPU 60
Checking the Hydraulic Fluid
Maintenance
Spare parts
Parts that are specified in the maintenance procedures of this section can be
obtained from MTS Systems Corporation. See “Contact information” on the back
of the title page to order spare parts.
Lockout/tagout
For your safety, follow all appropriate lockout/tagout procedures while
performing HPU maintenance.
Operating the HPU
When running the HPU, become familiar with the sounds and smells of the HPU.
Changes in the sounds and smells of the HPU might indicate that maintenance or
service is needed.
Checking the Hydraulic Fluid
Hydraulic fluid contamination and deterioration normally occur in most
hydraulic systems. Failure to keep your fluid sufficiently free of contaminants or
to change the fluid before severe fluid breakdown occurs will cause poor system
performance and may lead to expensive system cleanups. Servovalves are
especially susceptible to damage from dirty hydraulic fluid.
To avoid these problems, you must maintain a clean hydraulic system. Regularly
test samples of your hydraulic fluid and follow the recommended maintenance
procedures described here. For more information on hydraulic fluid care, refer to
the Hydraulic Fluid Care Guide (part number 050-000-536).
Important To prevent problems with inconsistent and inferior fluids, MTS
recommends only Exxon Mobil DTE 25 or Shell Tellus 46 to its
customers.
Procedure
Perform the following visual and olfactory checks of the hydraulic fluid’s
condition weekly. If you suspect contamination of the hydraulic fluid, take a
sample and have it analyzed.
1. Check the fluid level in the HPU sight gage to verify that the fluid level is
correct.
• A low level can indicate a leak. If necessary, add enough fluid to bring
the reservoir level up to the proper operating level.
• A high level can indicate water contamination from the heat exchanger.
2. Check the hydraulic fluid color. Clean hydraulic fluid is amber in color.
Keep a sample of brand-new hydraulic fluid in a clean glass container for
comparison. A change in color can mean that the fluid is contaminated or
that it has broken down chemically. Refer to the table,”Appearance of
Hydraulic Fluid Sample if the hydraulic fluid appears different than the
clean sample.
* See the Series 111 Accumulator Product Information manual (part number 011-553-304). An accumulator
is an optional feature that can be added to the pressure line.
† See the Heat Exchanger Care and Water Quality Guide (part number 015-164-000).
‡ Special training required. Contact MTS Systems Corporation.
§ See the Hydraulic Fluid Care Guide (part number 050-000-536).