Maintenance Manual BARRIER SERVO ASSEMBLY F1510 SERIES

Transcription

1 Maintenance Manual BARRIER SERVO ASSEMBLY F1510 SERIES NOTICE: PROPRIETARY INFORMATION OF, A BUSINESS UNIT OF MEGGITT PLC. THE INFORMATION CONTAINED IN THIS DOCUMENT IS DISCLOSED IN CONFIDENCE. IT IS THE PROPERTY OF WHITTAKER CONTROLS, AND SHALL NOT BE USED, DISCLOSED TO OTHERS, OR REPRODUCED IN WHOLE OR IN PART WITHOUT THE EXPRESS WRITTEN CONSENT OF WHITTAKER CONTROLS. IF CONSENT IS GIVEN THIS NOTICE SHALL APPEAR IN ANY SUCH REPRODUCTION. ORIGINAL 09/01/2001

2 LIST OF EFFECTIVE PAGES On a revised page, the portion of text or illustrations affected by the change is indicated by a vertical line in the outer margin of the page. When a revision is issued, the entire document is reissued with the current revision number and date shown on all pages. For major revisions, the basic number is incremented. For minor revisions, the number following the decimal is incremented. Dates of issue for original and subsequent revisions are as follows: Original /01/2001 The total number of pages in this technical document is 25 consisting of the following: Title, A, 1 23 TABLE OF CONTENTS SUBJECT PAGE Introduction... 1 Description and Operation... 1 Fault Isolation... 6 Disassembly... 9 Cleaning Inspection Repair Assembly Illustrated Parts List GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page A

3 INTRODUCTION 1. General This manual provides component maintenance shop instructions for the Barrier Servo Assembly (servo). 2. Revision Service This manual will be revised as necessary to show the current information. 3. Weights and Measurements Weights and measurements in this manual are expressed in both English (U.S. customary) and Metric (SI) units. DESCRIPTION AND OPERATION NOTE: The F1510 Barrier Servo Assembly is a direct replacement for the Servo Assembly. The Barrier Servo assembly incorporates a vented barrier space at each of the fuel/air interfaces in order to eliminate cross contamination of either fluid. 1. Description The Barrier Servo Assembly (servo) (see Figure 1) provides the means of controlling a fuel valve for regulation of the fuel sense port pressure to a preset value. The major functional components of the servo are the pressure control section, the surge control section, the opening time adjustment (needle valve) and the servo body. 2. Operation A. Main Valve Closed (Refer to Figure 2, Sheet 1) With reference air pressure less than the bias pressure (16 psi, 1,1 bar or 25 psi, 1,7 bar) the control poppet is closed, shutting off downstream flow through the servo. The quick-dump poppet is open, allowing upstream pressure into the main valve piston chamber, which, together with the spring force, keeps the main valve piston closed. GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 1

4 Figure 1. Barrier Servo Assembly B. Main Valve Opening (Refer to Figure 2, Sheet 2) When reference air pressure is applied to the AIR port, the quick-dump poppet closes, shutting off upstream pressure from the main valve piston. The control poppet opens, allowing fuel to bleed downstream, from the main valve piston through the opening speed adjustment screw, allowing it to open at a controlled rate. C. Controlling Main Valve (Refer to Figure 2, Sheet 2) As the main valve piston opens, flow increases and the pressure at the downstream pressure sense point increases. When the downstream sense port pressure increases to the preset value, the control poppet throttles the flow through the inlet orifice to control the main valve piston pressure and its position, to regulate the flow through the main valve. D. Surge Control (Refer to Figure 2, Sheet 3) If, due to changes in downstream conditions, the pressure at the downstream sense port increases faster than the control piston can regulate, the quick-dump piston will lift the quick-dump poppet, causing the main valve piston to close very rapidly. In this way, surge pressures are controlled. GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 2

5 Figure 2. Flow Schematic Diagram (Sheet 1 of 3) GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 3

6 Figure 2. Flow Schematic Diagram (Sheet 2) GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 4

7 Figure 2. Flow Schematic Diagram (Sheet 3) GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 5

8 E. Main Valve Closing (Refer to Figure 2 Sheet 1) When the reference air pressure is released, two actions take place. First, the control poppet closes, shutting off flow through the servo. Second, the quick-dump poppet opens, allowing upstream pressure into the main valve piston, causing rapid closure. 3. Leading Particulars (Refer to Table 1) Table 1. Leading Particulars Service...Automotive and Aviation Fuels Operating Pressure (maximum) psi (13,6 bar) Fluid Temperature to 165 F ( 54 to 74 C) Ambient Temperature to 165 F ( 54 to 74 C) Weight (approximate) Stainless Steel Body pounds (2,0 kg) Aluminum Alloy Body (Mod C) pounds (0,6 kg) 1. General FAULT ISOLATION A. Examine the servo to verify completeness of assembly, cleanliness, correct identification, and that no obvious damage is evident. B. Visually verify that all markings and nomenclature are complete and legible. C. Refer to Table 2 for fault isolation information. Locate suspected faulty component and take appropriate remedial action. D. All normal rules and procedures associated with good safety practices during performance of fault isolation must be observed and implemented at all times. GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 6

9 Table 2. Fault Isolation FAULT POSSIBLE CAUSE CORRECTIVE ACTION Main valve will not open Insufficient air pressure Check for the correct pressure at the servo AIR port. Main valve is partially open and will not regulate Fuel sense line blocked Disk (42, IPL Figure 1) installed with no auxiliary servo used Disk (42, IPL Figure 1) and auxiliary servo installed Opening time adjustment shut off Main valve seat for quick-dump poppet (6, IPL Figure 1) contaminated or damaged Screw (3, IPL Figure 1) too tight Poppets jammed by contamination Opening time adjustment shut off Main valve seat for quick-dump poppet (6, IPL Figure 1) contaminated or damaged Remove the blockage. Remove the disk. Check the auxiliary servo for correct operation. Adjust the opening time adjustment screw (34, IPL Figure 1 to the correct setting. Cycle the valve to remove the contamination. Remove the servo and service the main valve. Tighten the screw until it is bottomed out. Then, back the screw out 1/8 to 1/4 turn. Make sure that the washers can be rotated freely. Overhaul the servo. Adjust the opening time adjustment screw (34, IPL Figure 1 to the correct setting. Cycle the valve to remove the contamination. Remove the servo and service the main valve. GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 7

10 Table 2. Fault Isolation (continued) FAULT POSSIBLE CAUSE CORRECTIVE ACTION Main valve is partially open and will not regulate (continued) Main valve open but regulated pressure is high Main valve open but regulated pressure is low External leakage from barrier vent holes Air-to-fuel or fuel to air contamination Screw (3, IPL Figure 1) too tight Disk (42, IPL Figure 1) and auxiliary servo installed Main valve contaminated Poppets jammed by contamination Fuel sense line leakage Bias pressure setscrew (19, IPL Figure 1) incorrectly adjusted Bias pressure setscrew (19, IPL Figure 1) incorrectly adjusted Insufficient pump pressure Worn or damaged packings or seals Barrier vent holes blocked Worn or damaged packings or seals Other contamination sources in system Tighten the screw until it is bottomed out. Then, back the screw out 1/8 to 1/4 turn. Make sure that the washers can be rotated freely. Check the auxiliary servo for correct operation. Service the main valve. Overhaul the servo. Locate and repair the leak. Adjust the bias pressure to the correct setting. Adjust the bias pressure to the correct setting. Check pump capacity. Overhaul the servo. Clear the blockage (overhaul the servo). Overhaul the servo. Check and correct as necessary. GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 8

11 Table 2. Fault Isolation (continued) FAULT POSSIBLE CAUSE CORRECTIVE ACTION Leakage at servo/main valve interface Leakage at top of servo Mounting screws loose Damaged or missing packings (39 or 40, IPL Figure 1) Incorrectly installed packings (39 or 40, IPL Figure 1) or screen (41) Leakage from the bolt (32) or the plugs (37 or 38) Worn or damaged packings (11 or 26) Bolt (17) loose Tighten the screws evenly and securely. Replace the packings. Replace the packings and the screen. Tighten the bolt or the plugs. If necessary, remove and reseal the plugs. Replace the packings. Tighten the bolt securely. Servo will not operate Damaged spring or piston Overhaul the servo. Replace the damaged parts. 1. Overhaul Parts Kit DISASSEMBLY Refer to Table 3 for a list of the recommended overhaul replacement parts. Overhaul Parts Kit, Part Number KITF1510, contains all of the parts listed in Table Disassembling the Barrier Servo Assembly (Refer to IPL Figure 1) A. Disassembling the Surge Control Section 1) Remove the retaining ring (1) and the cap (2) from the servo body (43). 2) Use a screwdriver in the slot of the piston (9) to prevent it from rotating. Remove the screw (3) and the washers (4 and 5) from the opposite end of the piston. GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 9

12 Table 3. Recommended Overhaul Replacement Parts IPL FIGURE 1 ITEM NUMBER PART NUMBER DESCRIPTION QUANTITY 1 and 20 CMS Ring, Retaining 2 each Seal 1 each 8 and BD122 Packing, Preformed 2 each 10 and BD119 Packing, Preformed 3 each 11 and A123 Packing, Preformed 2 each 14 CMS Ring, Retaining 1 each BD010 Packing, Preformed 1 each BD007 Packing, Preformed 1 each Ring, Retaining 1 each N Packing, Preformed 1 each BD009 Packing, Preformed 1 each A130 Packing, Preformed 1 each Screen, Filter 1 each 3) Remove the poppet (6), the packing (8) and the slipper seal (7) from the servo body (43). 4) Remove the piston (9) and the spring (13) from the servo body (43). Remove the packing (10) from the seal groove of the piston. Remove the packings (11 and 12) from the seal grooves of the servo body. 5) Using retaining ring pliers, remove the retaining ring (14) from the servo body (43). 6) Remove the seal retainer (15) and the packing (16) from the servo body (43). B. Disassembling the Pressure Control Section NOTE: If it is important to retain the bias pressure setting, skip step 1 below and proceed to step 2. 1) Remove the bolt (17) and the washer (18) from the cap (21). Using an Allen wrench, remove the setscrew (19) from the cap. GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 10

13 2) Remove the retaining ring (20), the cap (21) (or the cap assembly, items 17, 18, 19 and 21), the spring retainer (22) and the spring (23) from the servo body (43). 3) Remove the piston (24) and the packing (29) from the servo body (43). Remove the packings (25 and 26) from the piston. 4) Using a small flat-bladed screwdriver (0.05 to 0.06 inch [1,3 to 1,5 mm] diameter), remove the retaining ring (27) from the servo body (43). 5) Remove the seal retainer (28) and the packings (30 and 31) from the servo body (43). C. Disassembling the Opening Time Adjustment Section 1) Remove the bolt (32), the washer (33) from the servo body (43). 2) Remove the needle valve screw (34) from the servo body (43). D. Removing the Bleed Screws and the Body Plug 1) Remove the two screws (35) and the washers (36) from the servo body (43). 2) Do not remove the plugs (37 and 38) from the servo body (43) unless there has been leakage around the plugs. 3) If installed, remove the packings, (39 and 40), the screen (41) and the disk (42) from the servo body (43). 1. Cleaning Materials CLEANING Refer to Table 4 for recommended cleaning materials. Suitable equivalent cleaning materials may be substituted for the items listed. GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 11

14 Table 4. Recommended Cleaning Materials DESCRIPTION SPECIFICATION SOURCE Brush, Bristle, stiff, nonmetallic Commercially available Dry Cleaning Solvent P-D-680, Type 2 Commercially available Pick, Teflon Commercially available Plastic Bags Commercially available Tissues, lint-free Commercially available 2. Cleaning Procedures WARNING: DRY CLEANING SOLVENT IS FLAMMABLE AND TOXIC TO EYES, SKIN, AND RESPIRATORY TRACT. SKIN/EYE PROTECTION REQUIRED. AVOID REPEATED/ PROLONGED CONTACT. USE ONLY IN WELL VENTILATED AREAS. GOOD GENERAL VENTILATION IS NORMALLY ADEQUATE. KEEP AWAY FROM OPEN FLAMES OR OTHER IGNITION SOURCES. A. Clean all metal parts by washing thoroughly in dry cleaning solvent. Remove stubborn deposits by scrubbing with a nonmetallic stiff bristle brush. Use a Teflon pick to remove obstructions from ports, grooves and passages. NOTE: All of the parts must be free of corrosion, dirt, grease, oil, or any other foreign matter. WARNING: WEAR EYE PROTECTION WHEN DRYING PARTS WITH COMPRESSED AIR. DO NOT DIRECT AIRSTREAM AT PERSONNEL OR LIGHT METAL PARTS. B. Dry parts with clean lint-free tissues or clean, dry compressed air. C. Package clean parts in plastic bags. GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 12

15 INSPECTION 1. General A. Under strong light and magnification, visually check all parts in accordance with the general criteria specified in paragraph 2 below. B. Repair minor damage in accordance with instructions presented in the REPAIR section. If damage is major or beyond simple repair, replace the part rather than attempt extensive repairs. 2. Component Checks (Refer to Table 5) Table 5. Component Checks General DESCRIPTION (IPL Figure 1 Item No.) Quick-Dump Poppet (6) Quick-Dump Piston (9) Quick-Dump Spring (10) (Wire size: inch [1,91 mm] diameter) Quick-Dump Spring (10A) (Wire size: inch [1,47 mm] diameter) CHECK CRITERIA 1) Visually check all parts as applicable for nicks, cracks, cuts, burrs, corrosion, breaks, scoring, deformation, dents, thread damage, or any other obvious defects. 2) Make sure that the ports, passages, recesses and sealing grooves are clean and unobstructed. 3) Check all sealing and seating surfaces for damage or corrosion which would affect sealing. 1) Replace the poppet if there is scoring on the outside diameter which would scratch or damage the slipper seal. 2) Replace the poppet if bare metal shows through the anodized surface. 1) Replace the piston if there is scoring on the outside diameters of the piston body or the piston shaft. 2) Replace the piston if bare metal shows through the anodized surface. Check for: 1) Deformation or permanent set. 2) Free length of approximately 2.29 inches (58,2 mm). Check for: 1) Deformation or permanent set. 2) Free length of approximately 2.48 inches (63,0 mm). GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 13

16 Table 5. Component Checks (continued) DESCRIPTION (IPL Figure and Item No.) Control Spring (23) Pressure Control Poppet (24) Servo Body (43) (stainless steel) CHECK CRITERIA Check for: 1) Deformation or permanent set. 2) Free length of approximately 0.80 inch (20,3 mm). Check for: 1) Check that the ports in the poppet are clear between the stem and the piston. Replace the poppet if: 1) There is scoring on the outside diameters of the piston body or the piston shaft. 2) If bare metal shows through the anodized surface. Check for: 1) Scoring on both of the large bore inside diameters. 2) Damage to the seat at the bottom of the control pressure bore. 3) Damage to the seat or the threads for the opening time adjustment screw. 4 Raised burrs on the seating surface for the main valve. The surface must be flat (may be repaired). 5) Scoring on the seal groove surfaces for the packings. 6) Contamination in the orifice at the bottom of the control pressure bore. The orifice must be clean. 7) Contamination in the two barrier vent holes in the side of the body. The vent holes must be clean. Minor damage may be repaired. Replace the body if there is extensive scoring, corrosion, or other damage. GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 14

17 Table 5. Component Checks (continued) DESCRIPTION (IPL Figure and Item No.) Servo Body (43A) (aluminum alloy) CHECK CRITERIA Check for: 1) Scoring on both of the large bore inside diameters. 2) Damage to the seat at the bottom of the control pressure bore. 3) Damage to the seat or the threads for the opening time adjustment screw. 4 Raised burrs on the seating surface for the main valve. The surface must be flat (may be repaired). 5) Scoring on the seal groove surfaces for the packings. 6) Contamination in the orifice at the bottom of the control pressure bore. The orifice must be clean. 7) Contamination in the two barrier vent holes in the side of the body. The vent holes must be clean. Replace the body if bare metal shows through the anodized surface. Replace the body if there is extensive scoring, corrosion, or other damage. REPAIR 1. General Repairs normally will consist of replacing damaged or malfunctioning parts with new parts, however, this section outlines minor repair procedures permissible for component parts, and specifies mandatory replacement parts. 2. Repair Materials Refer to Table 6 for recommended repair materials. Suitable equivalent repair materials may be substituted for the items listed. GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 15

18 Table 6. Recommended Repair Materials DESCRIPTION SPECIFICATION SOURCE Cloth, Abrasive, Crocus, 600-grit P-C-458 Commercially available 3. Repair or Replacement A. Replace all parts which are obviously cracked, worn, deformed, damaged beyond repair, or which do not meet check requirements and cannot be restored to serviceable condition by allowable repair. B. Replace all parts listed in DISASSEMBLY section Table 3, recommended replacement parts, during each overhaul of the servo assembly. C. Polish out minor corrosion and surface damage on stainless steel parts with crocus abrasive cloth. D. Polish out minor scoring on the quick-dump poppet (6, IPL Figure 1), the quick-dump piston (9) and the pressure control poppet (24) with crocus abrasive cloth. E. After polishing, re-clean parts as specified in the CLEANING section. F. Clear minor thread damage with a thread restoring tool; replace all threaded components having crossed or stripped threads. 1. Overhaul Replacement Parts ASSEMBLY Refer to Table 3 for recommended replacements parts information. 2. Assembly Materials Refer to Table 7 for recommended assembly materials. Suitable equivalent materials may be substituted for the items listed. GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 16

19 Table 7. Recommended Assembly Materials DESCRIPTION SPECIFICATION SOURCE Masking Tape Commercially available Sealant, Pipe Thread SWAK Swagelok Corporation Solon Road, Solon, Ohio Silicone Grease DC1292 Dow Corning Corporation (V71984) 2200 West Salzburg Road Auburn, Michigan Voice Telephone: Fax Telephone: Assembling the Barrier Servo Assembly (Refer to IPL Figure 1) A. Lubrication Prior to assembly, LIGHTLY lubricate all of the packings and seals with silicone grease (DC1292). CAUTION: DO NOT USE TEFLON TAPE ON THE THREADS OF THE PLUG. B. Installing the Body Plug and the Bleed Screws 1) If a plug (37 or 38) has been removed, apply a small bead of pipe thread sealant (SWAK) around the threads at the small end of the plug, approximately 1/16-inch (1,5 mm) from the end. Apply a bead of sealant along the length of the threaded hole on the servo body (43). Install the plug in the servo body and tighten it securely. 2) Install the screws (35) and the washers (36) in the bleed ports of the servo body (43). Tighten the screws securely. C. Installing the Opening Time Adjustment Section 1) Install the opening time needle valve screw (34) in the servo body (43). Tighten the screw until it is bottomed out, and then back it out approximately 1½ turns. Adjustment of the opening time will be performed during installation of the servo assembly in the fueling system. 2) Install the bolt (32) and the washer (33) in the servo body (43). Tighten the bolt securely. GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 17

20 D. Installing the Pressure Control Section Components 1) Install the packing (30) on the seal retainer (28). Install the packing (31) in the packing groove of the servo body (43). Install the seal retainer assembly in the servo body. 2) Secure the seal retainer assembly (28) in the servo body (43) by installing the retaining ring (27). With the seal retainer assembly held down, feed the retaining ring into its groove using a small flat-bladed screwdriver (0.05 to 0.06 inch [1,3 to 1,5 mm] diameter). Make sure that the retaining ring is completely seated in its groove. 3) Install the two packings (25) in the packing grooves of the pressure control poppet (24). Install the packing (26) in the packing groove on the needle stem of the pressure control poppet. Install the poppet assembly in the servo body. Install the packing (29) in the upper packing groove of the servo body (43). NOTE: The retaining ring (20) must be installed with its sharp edge facing outward from the servo body (43). 4) Install the spring (23), the spring retainer (22) and the cap (21) in the servo body (43). Secure the parts with the retaining ring (20). NOTE: If the bolt (17) and the washer (18) have not been removed from the cap (21), skip steps 5 and 6 below and proceed to paragraph E. 5) Install the setscrew (19) in the cap (21). Tighten the setscrew until it contacts the retainer (22) without compressing the spring (23). Tighten the setscrew (against the spring force) an additional 3-½ turns (2-½ turns for Mod A servos). This is the initial adjustment. Further adjustment of the pressure control setscrew may be required during installation of the barrier servo assembly in the fueling system. 6) Install the bolt (17) and the washer (18) in the cap (21). Tighten the bolt securely. E. Installing the Surge Control Section Components 1) Install the packing (16) and the seal retainer (15) in the servo body (43). 2) Secure the seal retainer (15) in the servo body (43) by installing the retaining ring (14), using retaining ring pliers. 3) Install the packing (8) and the slipper seal (7) in the servo body (43). 4) Install the packing (10) in the seal groove of the piston (9). Install the packings (11 and 12) in the seal grooves of the servo body (43). 5) Install the spring (13) and the piston assembly (9) in the servo body (43). GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 18

21 6) Install the poppet (6) in the servo body (43). Make sure that the poppet slides freely in the poppet bore. 7) Use a screwdriver in the slot of the piston (9) to prevent it from rotating. Install the screw (3) and the washers (4 and 5) in the end of the piston. Tighten the screw until it is bottomed out. Then, back the screw out 1/8 to 1/4 turn. Make sure that the washers can be rotated freely. NOTE: The retaining ring (1) must be installed with its sharp edge facing outward from the servo body (43). 8) Install the cap (2) in the servo body (43) and secure it with the retaining ring (1). 9) Install the screen (41) and the packings (39 and 40) on the face of the servo body (43) and use masking tape to retain them. 1. General ILLUSTRATED PARTS LIST This section lists, describes, and illustrates all detail parts required for maintenance support of the Barrier Servo Assembly. 2. Scope of Information A. The parts list is arranged in the general order of disassembly. The listing is indented to show the relationship between each part and its next higher assembly. Item numbers used in the parts list are keyed to the corresponding numbers of the accompanying illustration. B. MODIFICATION CODE The modification code indicates the parts usage with respect to the end item. When the MOD- IFICATION CODE column is blank, the part usage is applicable to all versions unless otherwise specified in the DESCRIPTION column. Modification codes used in this manual are listed in the following table. GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 19

22 MODIFICATION CODE (OR SUFFIX) (Basic) A C D DESCRIPTION OF MODIFICATION TO BASIC F1010 BARRIER SERVO ASSEMBLY Corrosion-resisting steel body, 25 psi (1,7 bar) bias pressure, not for use on flow control valve applications. 16 psi (1,1 bar) bias pressure (quick-dump spring change). Aluminum alloy body. For flow control valve applications (flow passage blocked, plug removed). C. How to Identify a Part 1) When the part number is known: Refer to the parts list for the item number, description, modification codes, and quantity. Refer to the illustration to verify the physical appearance and location of the part. 2) When the part number is not known: Review the illustrations to identify the part by physical appearance and location. Refer to the accompanying parts list to obtain the part number, description, modification codes, and quantity. D. Abbreviations ASSY FIG. IPL MOD Assembly. Figure. Illustrated Parts List. Modification. GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 20

23 IPL Figure 1. Barrier Servo Assembly GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 21

24 FIG. ITEM PART NUMBER DESCRIPTION MOD CODES SURGE CONTROL SECTION 1 CMS C RING, RETAINING C CAP C CAP C X1/2LG C SCREW, SELF-LOCKING, Hex socket 1 button head 4 CAN960C8 C WASHER, FLAT C WASHER, NYLON C POPPET, QUICK-DUMP C SEAL BD122 C PACKING, PREFORMED C PISTON, QUICK DUMP BD119 C PACKING, PREFORMED A123 C PACKING, PREFORMED BD122 C PACKING, PREFORMED C SPRING, QUICK-DUMP (Wire size: inch [1,91 mm] diameter) C SPRING, QUICK-DUMP (Wire size: inch [1,47 mm] diameter) A 1 14 CMS C RING, RETAINING C RETAINER, SEAL BD010 C PACKING, PREFORMED 1 PRESSURE CONTROL SECTION 17 CMS C BOLT, MACHINE, Hex (¼-28UNF) C WASHER, NYLON 1 19 CAN565F428H9 C SETSCREW (Bias pressure adjustment) 1 20 CMS C RING, RETAINING C CAP C CAP C C RETAINER, SPRING C SPRING, PRESSURE CONTROL C POPPET, PRESSURE CONTROL BD119 C PACKING, PREFORMED BD007 C PACKING, PREFORMED 1 UNITS PER ASSY GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 22

25 FIG. ITEM PART NUMBER DESCRIPTION MOD CODES C RING, RETAINING C RETAINER, SEAL A123 C PACKING, PREFORMED N C PACKING, PREFORMED BD009 C PACKING, PREFORMED 1 OPENING TIME ADJUSTMENT SECTION 32 CMS C BOLT, MACHINE, Hex (¼-28UNF) C WASHER, NYLON C SCREW, NEEDLE VALVE 1 BLEED SCREWS AND BODY PLUGS 35 CAN515C8-4 C SCREW, MACHINE (8-32UNC) C WASHER, NYLON 2 37 CAN932-3S C PLUG 1 37 CAN932-3S C PLUG (Not used on D Mod) D 0 38 CAN932-2S C PLUG 1 BARRIER SERVO ASSEMBLY / VALVE INTERFACE (LOOSE PARTS) A011 C PACKING, PREFORMED A130 C PACKING, PREFORMED C SCREEN, FILTER C DISK, FLOW BLOCKING D 1 SERVO BODY C BODY, SERVO (Stainless steel) C BODY, SERVO (Aluminum alloy) C 1 UNITS PER ASSY GROUND FUELING PRODUCTS GROUP Revision /01/2001 Page 23