Revision 1- July 21, 2009 (supercedes Revision – from July 14, 2006)

MAINTENANCE MANUAL
RFLD Series Duplex Lube Oil Filters
Carbon Steel & Stainless Steel
This Maintenance Manual covers the following Solar RFLD Series Duplex Lube Oil Filters
(both Carbon Steel and Stainless Steel construction):

SOLAR ASSY # STYLE HYDAC ASSY # HYDAC MODEL #

CARBON STEEL
1064721-100 I 02081490 RFLDBN/HC1320CAT10A1.1/S-150-V-KB-SOLAR
1064721-3A821 I 02088628 RFLDBN/HC1320CAT10A* SOLAR 1064721-3A821
1064721-76681 I 02083337 RFLDBN/HC1320CAT10A* SOLAR 1064721-76681
1064721-76961 I 02084269 RFLDBN/HC1320CAT10A* SOLAR 1064721-76961
1064721-78791 I 02087079 RFLDBN/HC1320CAT10A* SOLAR 1064721-78791
1064721-77361 I 02084262 RFLDBN/HC1320CAT10A*SOLAR 1064721-77361
1064722-100 II 02081498 RFLDBN/HC2520CAT10A1.1/S-150-V-KB-SOLAR
1064722-78181 II 02084266 RFLDBN/HC2520CAT10A* SOLAR 1064722-78181
1064722-3F711 II 02091543 RFLDBN/HC2520CAT10A* SOLAR 1064722-3F711
1064722-76351 II 02083345 RFLDBN/HC2520CAT10A* SOLAR 1064722-76351
1064722-76751 II 02084250 RFLDBN/HC2520CAT10A* SOLAR 1064722-76751
1064722-78811 II 02086853 RFLDBN/HC2520CAT10A* SOLAR 1064722-78811
1064722-78841 II 02087353 RFLDBN/HC2520CAT10A* SOLAR 1064722-78841
1064722-3A931 II 02089069 RFLDBN/HC2520CAT10A*SOLAR 1064722-3A931
1064722-3B231 II 02089366 RFLDBN/HC2520CAT10A*SOLAR 1064722-3B231
1064723-100 III 02081505 RFLDBN/HC1300CAL10A1.1/S-150-V-KB-SOLAR
1068954-76661 III 02083341 RFLDBN/AM1300CAL10A*SOLAR 1068954-76661
1068954-3B691 III 02089127 RFLDBN/AM1300CAL10A*SOLAR 1068954-3B691
1067923-79881 III 02087526 RFLDBN/HC1300CAL10A* SOLAR 1064723-79881
1064723-76661 III 02083349 RFLDBN/HC1300CAL10A* SOLAR 1064723-76661
1064723-78881 III 02087080 RFLDBN/HC1300CAL10A* SOLAR 1064723-78881
1064723-3F791 III 02090765 RFLDBN/HC1300CAL10A*SOLAR 1064723-3F791
1064721-3F682 III 02091421 RFLDBN/HC1300CAL3A*SOLAR 1064721-3F682
1070269-3C541 III 02090275 RFLDBN/HC1300CAL3A*SOLAR 1070269-3C541
1064724-100 IV 02081512 RFLDBN/HC2500CAS10A1.1/S-150-V-KB-SOLAR
1064724-77171 IV 02083353 RFLDBN/HC2500CAS10A* SOLAR 1064724-77171
1064724-3F411 IV 02090524 RFLDBN/HC2500CAS10A*SOLAR 1064724-3F411
1079176-100 V 02087936 RFLDBN/HC4020CAV10A1.1/S-150-V-KB-SOLAR

STAINLESS STEEL
1064721-200 I 02081491 RFLDBN/HC1323CAT10A1.1/S-150-V-KB-SOLAR
1064721-3A721 I 02088629 RFLDBN/HC1323CAT10A* SOLAR 1064721-3A721
1064721-3B832 I 02089566 RFLDBN/HC1323CAT10A* SOLAR 1064721-3B832
1064721-75431 I 02084254 RFLDBN/HC1323CAT10A* SOLAR 1064721-75431
1064721-77012 I 02084256 RFLDBN/HC1323CAT10A* SOLAR 1064721-77012
1064721-3B281 I 02088701 RFLDBN/HC1323CAT10A*SOLAR 1064721-3B281
1064721-3C831 I 02090036 RFLDBN/HC1323CAT10A*SOLAR 1064721-3C831
1064722-200 II 02081500 RFLDBN/HC2523CAT10A1.1/S-150-V-KB-SOLAR
1064722-78181 II 02086406 RFLDBN/HC2523CAT10A* SOLAR 1064722-78181
1064722-79871 II 02087931 RFLDBN/HC2523CAT10A* SOLAR 1064722-79871
1064722-3A501 II 02088881 RFLDBN/HC2523CAT10A*SOLAR 1064722-3A501
1064723-200 III 02081506 RFLDBN/HC1303CAL10A1.1/S-150-V-KB-SOLAR
1068954-79781 III 02089063 RFLDBN/AM1303CAL10A*SOLAR 1068954-79781
1064723-77501 III 02084261 RFLDBN/HC1303CAL10A* SOLAR*1064723-77501
1064723-3F651 III 02090761 RFLDBN/HC1303CAL10A*SOLAR 1064723-3F651
1070269-3C812 III 02090543 RFLDBN/HC1303CAL3A1.1/S-150-V-KB-SOLAR
1064724-200 IV 02081513 RFLDBN/HC2503CAS10A1.1/S-150-V-KB-SOLAR
1064724-3A451 IV 02088164 RFLDBN/HC2503CAS10A* SOLAR 1064724-3A451
1064724-3C541 IV 02090001 RFLDBN/HC2503CAS10A* SOLAR 1064724-3C541

BOLD ITALICIZED FILTERS HIGHLIGHTED ABOVE ARE STANDARD, NON-SPECIAL RFLD LUBE OIL FILTERS

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TABLE OF CONTENTS

INTRODUCTION 3

SAFETY PRECAUTIONS 3

RFLD SERIES DUPLEX LUBE OIL FILTERS OPERATING INSTRUCTIONS 3

MAINTENANCE PROCEDURES 5

TROUBLESHOOTING PROCEDURES 8

TOOL FOR OPENING FILTER VESSEL LID TO CHANGE FILTER

ELEMENT(S) 9

SPARE PARTS 10

DRAWINGS 11

TRANSFER VALVE ASSEMBLY - DISASSEMBLY INSTRUCTIONS 16

TRANSFER VALVE ASSEMBLY DRAWING 20

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INTRODUCTION

The Solar Turbines Duplex Lube Oil Filter is designed to be very customer friendly, i.e., easy to
operate, requires minimum maintenance, and provides maximum performance. The Duplex Filter
is a highly engineered filtration system that permits the filter elements to be changed while the
turbine is operating, which means uninterrupted turbine service, reducing down time.

By following these simple maintenance procedures and changing the filter element regularly at 29
psid (2 bar), the Solar Turbines Duplex Filter will last a long time and promote the longevity of
your Solar Turbines gas turbine.

1. SAFETY PRECAUTIONS

A. Always assume that oil is flowing through the filter.

B. The normal operating temperature of the turbine oil flowing through the filters is hot,
140°F (60°C) and under pressure up to 58 psi (4 bar). As a result, the oil can spray long
distances and can cause severe burns.
C. Allow the oil to cool before changing filter elements. Hot oil can cause severe burns!!
D. Wear protective clothing, eye protection, and oil proof gloves when working on the filter,
e.g., changing filter elements.
E. Do not loosen any bolts, ball valves, or drain plugs without first making sure the vessel to
be serviced has been relieved of all residual pressure!!
F. Check the control panel for important information, e.g., oil pressure and temperature,
before working on the filter.
G. Help prevent oil leaks by performing all regularly scheduled recommended maintenance
on RFLD filter. If any oil leaks appear during operation, report the emergency. Attend to
leaks immediately and follow all instructions listed to stop leaks. Oil can cause fires
resulting in major damage!!
1) In some cases, stopping an oil leak may be as simple as tightening a bolt
(Caution: Do not over torque fastener bolts) or turning a handle. In other cases,
the solution may be more complex. If you have any questions as to what to do to
fix/stop a leak, please contact HYDAC immediately.
2) If you get a leak when you switch the transfer valve, immediately switch back to
the original filter. Make sure oil is leaking. Oil droplets may be residual and not a
leak. Wipe the oil off and inspect for continuous flow or seepage.

2. RFLD SERIES DUPLEX LUBE OIL FILTERS OPERATING INSTRUCTIONS

A. The duplex lube oil filter is in operation anytime the oil pump(s) is on to lubricate the
bearings.
B. Which filter is in use? Oil will be flowing through the filter vessel side that the long end of
the transfer handle is closest to. The indicator arrow on the transfer valve plate identifies
the filter in use.
C. Oil is always being filtered.
D. When to switch functioning filter vessel: There are two options for filter element change
out:
a. On a regular time interval, when the turbine is undergoing routine maintenance,
e.g., every six months (note: the time interval between element changeouts
should never exceed six months!).
b. Differential pressure, i.e., the difference between the oil pressure at the inlet of
the filter and the outlet. The higher the differential pressure, the more clogged
the filter element(s) are with dirt.
1) The filters must be changed at or below 29 psid (2 bar) or an
alarm will register.
2) Observe the digital differential pressure displayed on the control
panel. The differential pressure is displayed in psi or bar.

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3) Pressure drop will be higher when the oil is cold and lower when
the oil is at normal operating temperature.
4) Maximum clean oil differential pressure at maximum oil flow and
120 degrees F will be less than 10 psi (0.7 bar) when new
elements are installed.
5) When the differential pressure is at 25 psi make preparations for
changing the filter element(s), i.e., have replacement filter
element kit ready for installation and the proper wrenches
necessary to change the filter elements. Prepare to change the
filters.
6) The time required for the differential pressure to reach 25 psi
(1.7 bar) is much longer than the time from 25 psi to 29 psi.
7) When the digital differential pressure on the control panel reads
29 psi (2 bar), an alarm indicator will activate on the control
panel as well. It is now time to switch the transfer valve to the
other filter vessel side (which contains clean filter elements).
The dirty filter elements must be replaced. One filter vessel side
should always have clean filter elements in it and ready for
immediate transfer.
E. Always shift the transfer valve when the dirt clogging indicator registers 29 psi (2 bar).
There is no bypass valve in the filter elements or filter vessel. For safety purposes, the
filter element collapse pressure rating is 165 psid which is higher than the lube oil pump
pressure rating and safety relief valve setting.
F. The transfer valve must be shifted fully to the right or left. Note: To shift the transfer
valve, the handle must be unlocked. To unlock the handle, lift the spring loaded knob,
which extracts the locking pin and releases the handle. The locking pin will re-seat when
the transfer valve is fully shifted left or right and thus properly aligned. Do not leave the
transfer valve handle in center position. Otherwise both sets of filter elements will clog
simultaneously, defeating the purpose of the duplex filter system.
G. If elements need changing (the indicator at 29 psi (2 bar)), refer to maintenance
procedures below).
H. Visually inspect the filter vessel per each manpower shift change to check for leaks and
to ensure the dirt clogging indicator has not reached 29 psi (2 bar) (differential pressure
gauge / indicator).

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3. MAINTENANCE PROCEDURES

A. Shift Maintenance
a. Check the dirt clogging gauge (digital differential pressure reading on the control
panel).
b. If filter vessel side’s clogging gauge registers at 29 psi, (2 bar) fully shift the
transfer valve handle so it points toward the other filter vessel side (non-clogged
side) and change the filter elements in the non-active, non operating, clogged
filter. Follow “Changing Filters” procedure below.
c. Check for leaks.
d. If there is a leak (make sure oil is leaking and not residual droplets) sound the
alarm and try to stop the leak.
B. When To Change Filters
a. Filters are changed when the dirt clogging indicator (digital differential pressure)
reaches 29 psid (2 bar).
C. Changing Filter Side in Operation
a. Confirm that the proper vessel requiring filter element change out is selected by
checking the pointer on the transfer valve. The pointer indicates the filter in
service. The embossed “L” on the center stem (where the handle is attached)
indicates the direction of oil flow.
b. Open the pressure equalization line ball valve (small ball valve above transfer
valve, in the center of the duplex filter assembly) to allow the pressure to
equalize on both sides (vessels) of the transfer valve.
c. Shift the transfer valve handle from the present position to the opposite position.
d. Do not leave the transfer valve handle in the center. The transfer valve must be
shifted fully to the right or left. Otherwise both sets of filter elements will clog
simultaneously, defeating the purpose of the duplex filter system. Accordingly,
the turbine would then have to be completely shut down to change the filter
elements.
e. Close the pressure equalization line ball valve.
f. Carefully and slowly open the air release valve (needle valve on vessel lid). This
will allow hydraulic system trapped air to escape.
g. After all air has escaped, oil will be discharged from the valve. When a steady
stream of oil appears, close the valve. All air has been removed. Use a small
container to capture the oil from the valve and dispose of the oil properly. (Note:
Always follow local or federal regulations regarding the disposal of waste oils.)
h. Inspect for leaks.
i. If there is a leak, shift the transfer back to its original position.
j. Identify the cause of the leak and take corrective action.
D. Changing Filter Elements and Lid O-Ring Seal.
(Note: Avoid stepping in oil; oil is slippery and oil on ground can cause injury due to slips
and falls.)
a. Confirm that the proper vessel requiring filter element change out and o-ring seal
change out is selected by checking the pointer on the transfer valve. The pointer
indicates the filter in service. The embossed “L” on the center stem (where the
handle is attached) indicates the direction of oil flow.
b. Obtain a new set of Solar Turbines filter elements (See Section 6. Spare Parts).
Use only genuine Solar Turbines filter elements.
c. Inspect the filter elements to ensure they are clean and free of any damage.
Leave them in the boxes with the plastic bags in place and transport them to the
filter vessel assembly.
d. Make sure the filter elements are the correct filter elements. Replacement
element model numbers are identified on the each filter vessel side’s nameplate.
e. After the transfer valve has been shifted to the opposite filter vessel side (the
non-clogged filter vessel side; see Changing Filters section procedure above),
wait 5 minutes to ensure that the non-clogged filter now in use is operating

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properly. After shifting the transfer valve, open the non-operating, clogged filter
vessel side’s vent valve. A mixture of air and oil will escape. After this initial
discharge, the leakage of the non-operating side (which is the leakage across the
transfer valve) should not exceed 70 ml/min at any header pressure. This
includes running pre/post lube pumps on the turbine package.
f. Open the dirty drain ball valve and allow the oil to drain down to an empty
container. (On some vessels, there are two drain ball valves: upper (dirty side
oil) and lower (clean side oil)).
g. With the proper wrench, loosen each filter vessel lid bolt (on the now non-
operating, clogged side) in a cross-pattern on the filter.
h. The swing bolts have a built in stop to prevent the nuts from being completely
removed as an aid to prevent nut loss. Do not force the nuts.
i. Lift the hinged lid all the way to the rear (110°) so it can not fall forward.
(Note: A hinged lid falling forward could potentially cause bodily injury!!)
j. Allow the oil to drip off the lid into the vessel.
k. Keep debris from falling into the filter vessel.
l. Remove the filter lid o-ring and inspect the lid o-ring.
m. The lid o-ring must be replaced each time the filter elements are changed.
n. Clean the lid o-ring groove in the vessel flange.
o. With feet firmly planted on ground (the person doing element changeout),
carefully remove each filter element by the handle, turning the element handle in
a twisting motion to “break” the element o-ring free at the bottom of the filter
element.
p. Leave the elements in the vessel for a few minutes to drain off excess oil.
q. Remove a new element from the box and bag and carefully set it aside in a
clean, safe area.
r. Remove the filter element(s) from the vessel after they have drained.
s. Place each old filter element in the plastic bag and box from the each new
element.
t. Repeat the process until all elements have been removed.
u. After all of the elements have been removed, inspect the inside of the filter
vessel.
v. Clean the inside of the filter vessel with a lint-free cloth, particularly the bottom.
w. Make sure that no seals remain on the filter element stools in the bottom of the
vessel.
x. Prior to installing the new filter element(s) moisten o-ring at the bottom of each
new filter element by wiping element o-ring with a lint-free cloth covered with
system oil. This will make it easier to install the filter element(s).
y. Install each new filter element(s) by carefully pressing elements down over the
each element nozzle inside the filter vessel side; be careful not to damage the
element.
z. Make sure that each filter element is properly seated over the element nozzle.
aa. Inspect the lid o-ring groove in the flange at the top of the vessel.
bb. Make sure that the lid o-ring is clean.
cc. Carefully replace the lid o-ring and make sure that it is properly seated in the
groove.
dd. Carefully swing the filter vessel lid over the vessel seating the o-ring.
ee. Align the lid with the flange.
ff. Swing the bolts, washers, and nuts back in place in the lid bolt slots.
gg. Hand-tighten the nuts and bolts first.
hh. Make sure the lid seal is properly seated and not pinched.
ii. Carefully tighten the bolts and nuts to 100 lbs-ft (135 N*m) in a cross-pattern.
jj. Close the vent valve of the non-operating vessel.
kk. Open the pressure equalization line ball valve and allow the vessel to fill slowly
with oil.

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ll. Open the air vent valve and allow the air to escape. Leave the valve open until a
solid stream of oil is observed. This ensures all of the air has been removed.
Capture the oil in a proper container and dispose of the oil properly.
mm. Close the air vent valve securely once no more air is apparent in the
system hydraulic oil .
nn. Check for leaks.
oo. Close the pressure equalization line ball valve.
pp. Check for leaks.
qq. Check oil pressure and temperature at the control panel. Both should be at
normal operating pressure and temperature.
rr. Check differential pressure at the control panel. The differential pressure should
be 7 psid (0.5 bar) at normal operating temperature.
ss. Dispose of the used filter elements properly. (Note: Always follow local or federal
regulations regarding the disposal of items containing waste oils.)
tt. Repeat this procedure every time the filter elements need to be changed out.

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4. TROUBLESHOOTING PROCEDURES

a. General Oil Leaks (Notes: Leak – continuous flow or seepage of oil; Droplets –
residual oil; Confirmation of oil leak or droplet – wipe away all oil and inspect
area for oil leak or droplet formation over time.)
1) Inspect area of leak.
2) Find the source of the leak.
3) Tighten adjacent nuts/bolts to proper torque setting.
4) If leak persists replace seals & properly torque fasteners.
5) Sound the alarm if warranted.
b. Air Vent Valve Oil Leak
1) Close vent valve tightly.
2) Tighten tubing connections (caution: compression fittings have a
finger flat ¼ turn procedure).
3) Replace fittings.
4) Replace vent valve.
c. Drain Ball Valve Oil Leaks
1) Tighten tubing connections.
2) Replace fittings.
3) Replace ball valve.
d. Filter Elements
1) During the normal operation of the turbine, differential oil
pressure increases over the normal operation cycle.
2) Switch the transfer valve to the opposite filter (non-clogged filter
vessel side).
3) Open the filter vessel side not in service and make sure it
contains the proper filter element(s).
4) Remove and inspect the filter elements for damage. Unless the
damage is major, e.g., cut seal or collapsed filter element, it will
not be easily detectable.
5) Replace the filter element(s). Make sure to follow “Maintenance
Procedures” section in doing this.

IF YOU HAVE ANY TROUBLESHOOTING QUESTIONS OR ISSUES, PLEASE CONTACT

HYDAC.

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5. TOOL FOR OPENING FILTER VESSEL LID TO CHANGE FILTER ELEMENT(S)

a. One (1) - 1” (25 mm) open end wrench or socket drive wrench for bolt removal.

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6. SPARE PARTS

DESCRIPTION SOLAR P/N:

a. 1064721-100 (STYLE I) 4” PORTS – CARBON STEEL

1064721-200 (STYLE I) 4” PORTS – STAINLESS STEEL
FOR ALL STYLE I VESSELS:
FILTER ELEMENT KIT 1064728-1
TRANSFER VALVE REPAIR KIT 1064728-2

b. 1064722-100 (STYLE II) 4” PORTS – CARBON STEEL

1064722-200 (STYLE II) 4” PORTS – STAINLESS STEEL
FOR ALL STYLE II VESSELS:
FILTER ELEMENT KIT (BN/HC) 1064728-3
TRANSFER VALVE REPAIR KIT 1064728-2

c. 1064723-100 (STYLE III) 2” PORTS – CARBON STEEL

1064723-200 (STYLE III) 2” PORTS – STAINLESS STEEL
FOR ALL STYLE III VESSELS:
FILTER ELEMENT KIT (BN/HC) 1064728-4
FILTER ELEMENT KIT (BN/AM) 1064728-21
TRANSFER VALVE REPAIR KIT 1064728-5

d. 1064724-100 (STYLE IV) 3” PORTS – CARBON STEEL

1064724-200 (STYLE IV) 3” PORTS – STAINLESS STEEL
FOR STYLE III VESSELS:
FILTER ELEMENT KIT (BN/HC) 1064728-6
TRANSFER VALVE REPAIR KIT 1064728-7

f. 1079176-100 (STYLE V) 6” PORTS- CARBON STEEL

FOR STYLE V VESSELS:
FILTER ELEMENT KIT (BN/HC) 1064728-10
TRANSFER VALVE REPAIR KIT 1064728-11

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7. DRAWINGS

a. DUPLEX FILTER ASSEMBLY, CARBON STEEL, MODEL #: 1064722-101

DUPLEX FILTER ASSEMBLY, STAINLESS STEEL, MODEL #: 1064722-201

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b. DUPLEX FILTER ASSEMBLY, CARBON STEEL, MODEL #: 1064722-101

DUPLEX FILTER ASSEMBLY, STAINLESS STEEL, MODEL #: 1064722-201

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c. DUPLEX FILTER ASSEMBLY, CARBON STEEL, MODEL #: 1064723-101,

DUPLEX FILTER ASSEMBLY, STAINLESS STEEL, MODEL #: 1064723-201,
and DUPLEX FILTER ASSEMBLY, STAINLESS STEEL, MODEL #: 1070269-
3C812

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d. DUPLEX FILTER ASSEMBLY, CARBON STEEL, MODEL #: 1064724-101

DUPLEX FILTER ASSEMBLY, STAINLESS STEEL, MODEL #: 1064724-201

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e. DUPLEX FILTER ASSEMBLY, CARBON STEEL, MODEL #: 1064724-101

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8. TRANSFER VALVE ASSEMBLY - DISASSEMBLY INSTRUCTIONS

Tools Required: Screw driver, Allen Wrenches, Adjustable Wrench

Note: See “Transfer Valve Assembly Drawing” section below for Item Number
References.

Procedure:

1. Shut off system. (Never attempt transfer valve repairs unless entire system
completely shut down and relieved of system pressure!!!!)

2. Relieve system pressure, i.e., reduce system pressure to atmospheric pressure.

(DANGER: Never attempt any transfer valve repairs unless entire system is
completely shut down and relieved of system pressure!!!!)

3. Position control handle, Item 24, in line with inlet/outlet pipes.

4. Loosen vent plug, Item 22, 2 pls.

WARNING: Loosen 2 turns only.

5. Drain filter assembly by removing drain plugs, Item 21, 2 pls, and 23, 2 pls.
NOTE: Drain system if filter assembly is at a low point in the piping.
CAUTION: Collect oil in a suitable container and dispose of it properly.

6. Support filter and transfer valve.

7. Unbolt transfer valve from system piping.

CAUTION: Disconnect electrical clogging indicators, if applicable.

8. Unbolt transfer valve from supports.

9. Lay filter in clean area with transfer valve inlet and outlet facing up.

10. Remove pressure equalization line by removing two (2) fittings.

11. Remove bolts, Item 8, from filter lids, Item 5.

12. Lift the lid up, Item 5.

13. Inspect lid o-ring for damage. Replace if necessary.

14. Remove elements, Item 1.

15. Remove four (4) screws, which connect right hand filter housing,
Item 3, to transfer valve housing, Item 4.

16. Remove right hand filter housing.

17. Remove ball seals, Item 15

18. Remove o-rings, Item 17, and discard.

19. Remove bushings, Item 16.

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20. Repeat steps 14 through 18 for the left-hand housing.

NOTE: Steps 22 through 29 are required only when replacing spindles, Items 6
and 18; spindle o-rings, Items 8 and 19; balls, Items 13 and 14; and friction washer.

21. Turn handle, balls and stem to full left or right position.
CAUTION: Balls will fall out.
22. Remove control handle, Item 24.

23. Remove spring retainer, Item 12.

24. Remove limit washer, Item 11.

25. Remove lid, Item 9.

26. Remove o-ring, Item 7, and discard.

27. Remove spindle, Item 6.

28. Remove spindle o-ring, Item 8, and discard.

29. Remove friction washer, Item 10, from spindle, Item 6, and discard.

30. Remove spindle, Item 18.

31. Remove o-ring, Item 19, from spindle and discard.

32. Clean and degrease transfer valve housing, Item 4, balls, spindles
and bushings.

33. Inspect all parts for damage. Replace items as necessary.

34. Install o-ring, Item 19, on spindle, Item 18.

35. Lubricate o-ring on spindle and o-ring area on the transfer

valve housing.

36. Carefully insert the shaft into the housing.

NOTE: O-ring end of shaft must go in last.
CAUTION: Insert shaft so that the upper shoulder is flush with
the bottom of the upper ball valve cavity.

37. Install friction washer, Item 10, on spindle, Item 6.

38. Install o-ring, Item 8, on spindle, Item 6.

39. Lubricate o-ring area on lid, Item 9.

40. Insert spindle into lid from stepped side.

41. Install o-ring, Item 7, on spindle/lid assembly.

42. Lubricate o-ring on spindle/lid assembly and o-ring area on transfer

valve housing.

43. Install spindle/lid assembly into transfer valve housing.

CAUTION: Do not push down on the spindle.

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44. Align stop pin, Item 20, in lid, Item 9, with right hand filter housing.

45. Install four (4) lid screws.

NOTE: Torque to 21 ft-lbs (28 Nm).

46. Align notches in the top of the spindle with the left filter housing and the transfer
valve inlet/outlet.

47. Align the lower spindle, Item 18, with the upper spindle, Item 6.

48. Insert lower ball, Item 14.

CAUTION: Ball must be oriented to provide flow as indicated by notches in the
spindle.

49. Insert upper ball, Item 13.

CAUTION: Align upper with lower ball to provide flow as indicated by notches in
the spindle.

50. Turn spindle/ball assembly 90º counterclockwise.

CAUTION: Make certain balls do not fall out.

51. Install bushings, Item 16, on left side of the transfer valve.

52. Lubricate o-ring grooves formed by bushings.

53. Install o-rings, Item 17, on left side of transfer valve.

54. Lubricate o-rings, Items 20.

NOTE: Use system fluid or silicone grease.

55. Install ball seals, Item 15, on left side of the transfer valve.

60. Align left filter housing with left side of transfer valve.
CAUTION: Do not pinch o-rings or ball seals.

61. Install four (4) screws to connect left hand filter housing to transfer valve housing,
Item 4.
NOTE: Torque to 52 Ft-lbs (70 Nm).

62. Repeat steps 51 through 58 for right hand filter housing.

63. Install limit washer, Item 11.

64. Check proper function of valve. Adjust limit washer if necessary.

65. Install spring retainer, Item 12.

66. Install control handle, Item 24.

67. Install pressure equalization line.

68. Lubricate the o-ring, Item 2, on the new or cleaned elements.

69. Install elements.

NOTE: Use a twisting action to avoid damaging the o-ring.

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70. Lubricate the housing lid o-rings.

NOTE: Use system fluid or silicone grease.

71. Install lid o-rings.

72. Install lid bolts.

73. Install filter on supports.

74. Bolt transfer valve to piping.

75. Reconnect electrical clogging indicators, if applicable.

76. Install drain plugs, Items 21, 2 places, and 23, 2 places.

77. Fill filter assembly with system fluid until fluid comes out the vent
plug, Item 22.

78. Close vent plug, Item 22, 2 places.

79. Pressurize the filter.

80. Check for leaks. If no leaks, filter is ready for operation

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9. TRANSFER VALVE ASSEMBLY DRAWING

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Revision 1- July 21, 2009 (supercedes Revision – from July 14, 2006)

Please contact HYDAC if you need any additional specification information on the RFLD
series Lube Oil Filters or their subcomponents.

If you have any other questions regarding the function of the RFLD Lube Oil Filters,
specifications, maintenance, or safety inquiries, please contact HYDAC TECHNOLOGY
CORPORATION. We are available Monday through Friday, from 8:00 a.m. through 5:00 p.m.
EST. Thank you for choosing HYDAC for your hydraulic filtration needs!

HYDAC TECHNOLOGY CORPORATION

2260 City Line Road
Bethlehem, PA 18017
Phone: (610) 266-0100
Fax: (610) 264-3540

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