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Section VII – Service, Inspection & Maintenance
A. Service Tools
No special tools are required to service this valve series.
B. Inspection
Periodic inspection of the fluid condition and tube or piping
connections can save time consuming breakdowns and
unnecessary parts replacement. The following should be
checked regularly.
1. All hydraulic connections must be kept tight. A loose
connection in a pressure line will permit the fluid to leak out.
If the fluid level becomes so low as to uncover the inlet pipe
opening in the reservoir, extensive damage to the system
can result. Loose connections also permit air to be drawn
into the system resulting in noisy and/or erratic operation.
2. Clean fluid is the best insurance for long service life.
Therefore, check the reservoir periodically for long service
life. Therefore, check the reservoir periodically for dirt and
other contaminants. If the fluid becomes contaminated, flush
the entire system and add new fluid.
3. Filter elements should also be checked periodically
for dirt and other contaminants. If the fluid becomes contami-
nated, flush the entire system and add new fluid.
4. Air bubbles in the reservoir can ruin the valve and
other components. If bubbles are seen, locate the source of
air and seal the leak.
C. Adding Fluid to the System
When hydraulic fluid is added to replenish the system, pour it
though a fine wire screen (200 mesh or finer). When
applicable, pump the fluid through a 10 micron filter. DO NOT
use a cloth to strain the fluid or lint may enter the system.
D. Adjustments
No periodic adjustments are required other than normal
system maintenance.
E. Replacement Parts
Reliable operation throughout the specified operating range
is assured only if genuine Vickers parts are used. Sophisti-
cated design processes and material are used in the
manufacture of our parts. Substitutions may result in early
failure. Part numbers are shown in the parts and service
drawings listed in Table 1.
F. Product Life
The service life of this product is dependent upon environ-
ment, duty cycle, operating parameters and system
cleanliness. Since these parameters vary from application to
application, the ultimate user must determine and establish
the periodic maintenance required to maximize life and
detect potential component failure.
G. Troubleshooting
Table 5 lists the common difficulties experienced with
directional valves and systems. It also indicates the probable
causes and remedies for each of the troubles listed.
Always remember that many apparent failures may actually
be the failure of other parts of the system. The cause of
improper operation is best diagnosed with adequate testing
equipment and a thorough understanding of the complete
hydraulic system.
Trouble
Possible Cause
Remedy
Valve spool fails to move
Dirt in system
Solenoids inoperative
Improper assembly
Improper installation connections
Disassemble, clean and flush
Check electrical source and solenoids
Check proper assembly. Refer to ap-
propriate figure and assembly procedure
Check installation drawings
Valve produces undesirable response
Improper valve assembly
Improper installation connections
Solenoid wiring reversed
Check parts drawing and installation
drawing for proper assembly and instal-
lation connections
Reverse connections to the solenoids
Table 5. Trouble Shooting Chart
