Steering Circuit Filter - Komatsu 930E-2 Shop Manual

STEERING CIRCUIT FILTER

The steering circuit filter (Figure 9-2) is located on the
inboard side of the fuel tank. The filter provides secon-
dary filtering protection for hydraulic oil flowing to the
bleeddown manifold valve for the steering and brake
systems.
An indicator switch (1) is designed to alert the operator
of filter restriction before actual bypass occurs. The
switch contacts close at 35 psid (240 kPa) to actuate a
warning lamp on the overhead display panel. Actual
filter bypass occurs at 50 psi (345 kPa).
NOTE: When the engine is initially started and the
hydraulic oil is cold, the warning lamp may actuate.
Allow the hydraulic system oil to reach operating tem-
perature before using the warning lamp as an indicator
to change the element.
Refer to Section P, "Lubrication and Service" for rec-
ommended normal filter element replacement interval.
Earlier replacement may be required if the restriction
indicator lamp turns on.
Premature filter restriction may indicate a system com-
ponent failure and signal a service requirement before
extensive secondary damage can occur.
NOTE: An early indication of the filter warning light at
first installation may be due to restriction in the filter as
it cleans the system. Unless the fluid appears contami-
nated or has a strong foul odor, do not change the oil;
replace only the filter elment.
FILTER ELEMENT REPLACEMENT
Relieve pressure before disconnecting hydraulic
and other lines. Tighten all connections before
applying pressure.
Hydraulic fluid escaping under pressure can have
sufficient force to enter a person's body by pene-
trating the skin and cause serious injury and pos-
sibly death if proper medical treatment by a
physician familiar with this injury is not received
immediately.
L09008
FIGURE 9-2. STEERING CIRCUIT FILTER
1. Indicator Switch
2. Setscrew
3. Head
4. Bleed Plug
5. O-Ring
Hydraulic System Filters
6. O-Ring
7. Filter Element
8. Bowl
9. O-Ring
10. Drain Plug
L9-3