D U P L E X F I L T E R A S S E M B L Y
s e r v i c e
i n s t r u c t i o n s
7.8 Open the bleed plug (5) on the off-line housing cover
one and one half turns. Open commuter valve (2) three
full turns to equalize pressure between the offline
housing and the on-line housing. Close the commuter
valve when a bubble free stream of oil flows from the
bleed plug. Tighten the bleed plug.
7.9 After element change ENSURE VISUAL DIFFERENTIAL
PRESSURE WARNING DEVICE IS RESET BY
PUSHING IN THE BUTTON; electrical devices are
reset automatically. When system reaches normal
operating temperature, check that the electrical switch
has not actuated and/or that visual warning button
remains depressed. If visual indicator actuates due to
a cold start condition, reset indicator as per Section 6.
Filter housing is now ready for change-over when
required.
8
Ball Valve Servicing
Refer to Service Parts List (Section 11 and 12) for item
numbers for seal kits and Pall product literature for
replacement part.
8.1 Completely shut down system and depressurize system
by opening bleed plug (5). Remove drain plug (8) after
depressurizing.
8.2 With the ball valve handle shaft facing the operator and
the handle pointer pointing to the right side, remove the
right hand Head Assembly.
8.3 Remove in the following order:
(a) Remove Filter Element (10) per section 7.
(b)
Remove 4 socket head cap screws (6), loosen 1 hex
head bolt (6.1) and remove the head assembly.
(c) Unscrew retainer seat (14) and O-ring (16) (see Fig. 5).
(d) Remove outer ball seat (17)
(e) Remove ball (19) (Note ball orientation when removing)
(f)
Remove inner ball seat (17)
(g)
Remove handle from valve shaft (7)
(h)
Remove valve shaft (28)
8.4 Replace all O-rings, nylon bar in retainer, ball seats and
valve shaft washer (30). Use appropriate kit per type of
seal. See Ball Valve Seal Kit list.
NOTE: Lubricate all o-rings before installation.
8.5 Install in the following order;
(a) Valve shaft (28) and handle (7), ensure the pointer on the
valve handle points to the disassembled side.
(b) Inner ball seat (17) and O-ring (18).
(c) Orient the ball such that the groove aligns with the key
on the stem of the handle, install ball (19).
(d) Outer ball seat (17) and O-ring (18),
(e) Install Retainer Seat Valve (14), Tighten Retainer Seat
Valve into valve body so that ball cannot move, then
back Retainer off by 1/8 to 1/4 turn to allow for rotation
of ball. (Resistance to ball rotation must be present. Free
rotation is not acceptable).
4
7.1 Open the bleed plug (5) on the off-line housing cover
a minimum of one and one half turns. Open commuter
valve (2) three full turns to equalize pressure between
the off-line housing and the on-line housing. Close the
commuter valve (2) when a bubble free stream of oil
flows from the bleed plug. Tighten the bleed plug.
7.2 Pull the latching pin and rotate change over valve handle
(7) 180° to bring off-line housing on-line. Insert latching
pin to prevent accidental handle movement.
NOTE: Pointed end of change-over valve handle (7) indicates
the filter housing on-line.
7.3 The off-line housing is now isolated from the system
by the changeover valve. Depressurize the housing by
slowly venting through the bleed plug (5). Remove drain
plug (8) on the filter head and drain fluid into a suitable
container. Discard fluid in accordance with local Health
and Safety regulations. Close drain plugs (5 and 8).
NOTE: During element replacement some small internal
leakage may be noted from the on-line filter housing. If a
large amount of leakage occurs, the ball valve seals may
require adjustment or the check valve seals need servicing.
Check for closure of commuter valve before disassembling
of unit for repairs.
7.4 Manually remove the cover (4) from tube (3). Remove
element (10) and carefully inspect the surface for
significant visible contamination. Normally no dirt should
show but visible dirt or particles can be an early warning
of system component breakdown and can indicate
potential system failure. Discard both the element
and its O-ring in accordance with local Health and
Safety Procedures. The filter element is
NOT CLEANABLE. Any attempt to clean the filter can
cause degradation of the filter medium and allow
contaminated fluid to pass through the filter.
7.5 Inspect filter cover (4) and tube (3) for possible damage
or malfunction and replace if damage is observed.
Remove any accumulated dirt from the filter tube and
cover interior, being careful to prevent contaminant
from entering the outlet and flowing downstream.
DO NOT run the system without a filter element (10)
installed. Inspect the O-rings on the cover (4) for
damage and replace if necessary. Use the correct
replacement filter element (10) part number called for
on assembly nameplate.
7.6 Lubricate element O-ring seal with clean system fluid
and push filter element (10) straight into filter housing.
Ensure that the O-ring end of the element points
towards the head. Ensure the cover (4) and tube (3)
threads are clean and dry. Lightly lubricate cover seal
with clean system fluid. HAND TIGHTEN cover or tube
and cover until it bottoms out.
7.7 Use a torque wrench and tighten cover and tube
assembly to 10-14 FT LBS (13-19 Nm).
Do Not Over Tighten.
WARNING:
FAILURE TO REPLACE DAMAGED PARTS IN THE
FILTER ASSEMBLY CAN CAUSE COMPONENTS IN
THE HYDRAULIC SYSTEM TO FAIL OR DEGRADE IN
THEIR PERFORMANCE.
UR229
UR229 Series
WARNING:
FAILURE TO DEPRESSURISE THE SYSTEM BEFORE
SEVICING UNIT COULD RESULT IN EXPLOSIVE
LOSS OF FLUID. DAMAGE TO EQUIPMENT AND
POSSIBLE PERSONAL INJURY
