Remove the hydraulic reservoir return filter
assemblies and replace filter elements as follows,
See Figure 20:
Caution: Extreme care must be exercised when
r e m o v i n g filter while oil is hot to prevent hands
from getting burned.
1. Remove filter assembly from hydraulic reser-
voir by removing mounting bolts and lockwash-
ers holding cover plate in place.
2 . Remove attaching hardware securing the bot-
t o m retaining plate and filter elements in the
h o l d e r assembly. Discard the retaining plate
sealing washer.
Fig. 21.
Remove Reservoir Cap, Dipstick and
Hand Hole Cover
3 . Remove filter elements and center retaining
plate from holder assembly. Discard the filter
by-pass the plugged filter element entering directly
elements.
into the hydraulic system.
Note: Do not attempt to clean or re-use the dirty
1. Loosen reservoir cap slowly to relieve pressure
filter elements.
in hydraulic reservoir. Remove reservoir cap,
dipstick, and hand hole cover as shown in Fig-
4. Install new filter elements in holder assembly
ure 21.
with the center retaining plate positioned be-
tween the top and bottom filter elements. Rese-
2. Unscrew filter element from element mounting
cure the elements in the holder assembly with
base and remove filter element as shown in Fig-
bottom retaining plate, using a new sealing
ure 22.
washer, and attaching hardware.
5. Reinstall and secure the return filter assemblies
3. Immerse filter element in hot soapy water. Soak
in the hydraulic reservoir with coverplate,
a n d intermittently agitate element and relief
mounting bolts and lockwashers.
valve components for approximately 30 minutes
to loosen dirt particles. Remove any remaining
d e p o s i t s between element pleats with a stiff
Clean Hydraulic Reservoir Suction Filter As-
bristled non-metallic brush as shown in Figure
s e m b l i e s : The hydraulic reservoir suction filter
23. Flush element and relief valve components
assemblies installed inside the hydraulic reservoir
with clean hot water until drain water is clear.
consist of a pleated metal filter element with seal-
ing gaskets secured between a mounting base and
cover type relief valve.
Recommended servicing procedures for clean-
ing the suction filter element are described below.
During normal operation, oil is drawn from the
r e s e r v o i r through the filter element under equal
p r e s s u r e by the main hydraulic pump before en-
t e r i n g the hydraulic system. However, when the
f i l t e r element becomes excessively plugged with
foreign material or contaminants, a difference in
p r e s s u r e within the reservoir and the inner side
of the filter element will be created. When the pres-
sure difference reaches 2.4 psi, the cover type re-
lief valve incorporated at the top of the filter
assembly will open permitting the hydraulic oil to
Remove Filter Element
Fig. 22.
[45-04-5]
