maintenance manual bypass servo assembly ... controls, inc. a meggitt plc company maintenance manual...

NOTICE: PROPRIETARY INFORMATION OF WHITTAKER CONTROLS, INC., A BUSINESS UNIT OF MEGGITT PLC.THE INFORMATION CONTAINED IN THIS DOCUMENT IS DISCLOSED IN CONFIDENCE. IT IS THE PROPERTY OFWHITTAKER CONTROLS, AND SHALL NOT BE USED, DISCLOSED TO OTHERS, OR REPRODUCED IN WHOLEOR IN PART WITHOUT THE EXPRESS WRITTEN CONSENT OF WHITTAKER CONTROLS. IF CONSENT IS GIVENTHIS NOTICE SHALL APPEAR IN ANY SUCH REPRODUCTION.

ORIGINAL – 03/15/2003

Maintenance Manual

BYPASS SERVO ASSEMBLY

2691786 SERIES

WHITTAKER CONTROLS, INC.A MEGGITT PLC COMPANY

MAINTENANCE MANUALBYPASS SERVO ASSEMBLY – 2691786 SERIES

GROUND FUELING PRODUCTS GROUP Revision 1.0 03/15/2003

LIST OF EFFECTIVE PAGES

On a revised page, the portion of text or illustrations affected by the change is indicated by avertical line in the outer margin of the page. When a revision is issued, the entire document isreissued with the current revision number and date shown on all pages. For major revisions, thebasic number is incremented. For minor revisions, the number following the decimal is incre-mented. Dates of issue for original and subsequent revisions are as follows:

Original 1.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 03/15/2003

The total number of pages in this technical document is 23 consisting of the following:

Title, A, 1 – 21

TABLE OF CONTENTS

SUBJECT PAGE

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Description and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Fault Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Illustrated Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17




INTRODUCTION

1. General

This manual provides component maintenance shop instructions for the Bypass 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 selec-ted Metric (SI) units.

DESCRIPTION AND OPERATION

1. Description

The Bypass Servo Assembly (servo) (see Figure 1) provides the means of controlling a fuel bypassregulator. There are two versions, air-set and spring-set. The bypass regulator will maintain a constantpressure at a downstream sensing point, such as a venturi, as a function of the supplied referenceair or adjustable spring pressure. The bypass regulator is normally mounted in the pump bypass lineand regulates the flow from the outlet to the inlet of the pump.

2. Operation – Air-Set Servo (See Figure 2)

A. Fuel Bypass Valve Open

With reference air pressure less than the bias pressure (25 psi [1,7 bar]) the control poppet isopen. This allows the upstream pressure through the servo and downstream. Upstream pressurekeeps the main valve piston in the open position, allowing full pump pressure to bypass to theinlet side of the pump.

B. Controlling the Main Valve

When regulated reference air pressure (25 psi [1,7 bar]) higher than the desired controlling pres-sure is applied, the control poppet closes. This applies the upstream fuel pressure to the backside of the main valve piston, closing the valve. The valve remains in the closed position until afuel sense signal (from a downstream source such as a venturi) starts opening the control poppetand allowing fuel pressure to bleed from the back side of the main valve piston.




Figure 1. Air-Set Bypass Servo Assembly – Cutaway View

3. Operation – Spring-Set Servo (See Figure 3)

A. Main Valve Closed

With no pressure applied to the pilot (air or electrical solenoid), upstream pressure passesthrough the servo and downstream. Upstream pressure keeps the main valve piston in the openposition, allowing full pump pressure to bypass to the inlet side of the pump.

B. Controlling the Main Valve

When the pilot is activated (air or electrical solenoid), upstream pressure can no longer bleeddownstream. The control poppet is closed (spring force) and upstream pressure is applied to theback side of the main valve piston, closing the valve. The valve remains in the closed positionuntil a fuel sense signal (from a downstream source such as a venturi) starts opening the controlpoppet and allowing fuel pressure to bleed from the back side of the main valve piston.

C. Main Valve Closing

Deactivating the pilot (air or electrical solenoid) will allow upstream pressure to pass through theservo downstream. This bleeds the pressure behind the main valve piston, allowing it to openfully.




Figure 2. Air-Set Bypass Servo Flow Schematic Diagram




Figure 3. Spring-Set Bypass Servo Flow Schematic Diagram




4. Leading Particulars (Refer to Table 1)

Table 1. Leading Particulars

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automotive and Aviation Fuels

Operating Pressure (maximum) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 psi (8,2 bar)

Fluid Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40 to 165°F (–54 to 74°C)

Ambient Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40 to 165°F (–54 to 74°C)

Weight (approximate)Aluminum Alloy Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 pounds (0,6 kg)Stainless Steel Body (Mod D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4 pounds (2,0 kg)

5. Model Variations

A. Air-Set Servo

The 2691786C or 2691786G series air-set servo has an aluminum body and provides for air-setcontrol with 25 psi control pressure bias. Refer to Table 2 for the available air-set servo vari-ations.

B. Spring-Set Servo

The 2691786H or 2691786J series air-set servo has a stainless steel body and provides forspring-set control. Refer to Table 3 for the available spring-set servo variations.

Table 2. Air-Set Servo Variations

SERVOMOD LETTERS DESCRIPTION

Basic Air-set regulation, control pressure bias of 25 psi (1,7 bar), aluminum alloy body

C 4-inch main valve bypass control

D Changes body to stainless steel

E Adds pressure limiting pilot valve, P/N 2706142-101

G 3-inch main valve bypass control




Table 3. Spring-Set Servo Variations

SERVOMOD LETTERS DESCRIPTION

Basic H 4-inch main valve spring-set bypass servo, 20 to 75 psi (1,4 to 5,1 bar)

D Changes body to stainless steel

E Adds pressure limiting pilot valve, P/N 2706142-101

J 3-inch main valve spring-set bypass servo, 20 to 75 psi (1,4 to 5,1 bar)

FAULT ISOLATION

1. General

A. Examine the servo to verify completeness of assembly, cleanliness, correct identification, andthat no obvious damage is evident.

B. Visually verify that all markings and nomenclature are complete and legible.

C. Refer to Table 4 for fault isolation information. Locate suspected faulty component and takeappropriate remedial action.

D. All normal rules and procedures associated with good safety practices during performance offault isolation must be observed and implemented at all times.




Table 4. Fault Isolation

FAULT POSSIBLE CAUSE CORRECTIVE ACTION

Main valve will not close Insufficient air pressure Check for the correct pressure at theservo AIR port.

Fuel sense line blocked Remove the blockage.

Defective auxiliary servo Check the auxiliary servo for correctoperation.

Seat (7) contaminated or dam-aged

Overhaul the servo

Poppet (2B) or piston (5A) jam-med by contamination

Overhaul the servo.

Main valve is partiallyclosed and will notregulate

Seat (7) contaminated or dam-aged

Overhaul the servo

Defective relief valve Check the relief valve for correctoperation.

Main valve contaminated Service the main valve.

Main valve is partiallyclosed and will notregulate (continued)

Poppet (2) or piston (5) jammedby contamination

Overhaul the servo.

Main valve open butregulated pressure ishigh

Fuel sense line leakage Locate and repair the leak.

Main valve open butregulated pressure islow

Insufficient pump pressure Check pump capacity.

Air-to-fuel or fuel to aircontamination

Worn or damaged packings orseals

Overhaul the servo.

Other contamination sources insystem

Check and correct as necessary.




Table 4. Fault Isolation (continued)

FAULT POSSIBLE CAUSE CORRECTIVE ACTION

Leakage at servo/mainvalve interface

Mounting screws loose Tighten the screws evenly andsecurely.

Damaged or missing packings(13)

Replace the packings.

Incorrectly installed packings (13)or orifice (31)

Replace the packings and the orifice.

Leakage from the bolt (19) or theplugs (17 or 24)

Tighten the bolt or the plugs. If nec-essary, remove and reseal the plugs.

Leakage from cap endof servo

Worn or damaged packings (12) Replace the packings.

Servo will not operate Damaged spring or piston Overhaul the servo. Replace thedamaged parts.

DISASSEMBLY

1. Replacement Parts Kits

Refer to the IPL section for information on the replacement parts kits.

2. Disassembling the Air-Set Bypass Servo Assembly (Refer to IPL Figure 1)

A. Remove the retaining ring (16) and the cap (3) from the servo body (1 or 1A).

B. Remove the E-ring (14), the piston (5), the spring (4) and the shim(s) (33) from the servo body(1 or 1A). Note the quantity of washers for reassembly reference. Remove the packings (12) fromthe servo body.

C. Remove the E-ring (14) from the poppet (2). Slide the guide (6) off of the poppet. Remove thepackings (9 and 11) from the poppet and the guide.

D. Remove the seat (7) from the servo body (1 or 1A). Remove the packing (10) from the packinggroove of the seat.

E. Remove the bolt (19) and the washer (20) from the servo body (1 or 1A).




F. Do not remove the plugs (17 or 24) from the servo body (1 or 1A) unless there has been leakagearound them.

3. Disassembling the Spring-Set Bypass Servo Assembly (Refer to IPL Figure 2)

A. Remove the screw (37) and the washer (36), and back out the setscrew (38) from the cap (34)until the spring pressure is released.

B. Remove the retaining ring (16) and the cap (34) from the servo body (1 or 1A).

C. Remove the retainer (39) and the spring (35) from the servo body (1 or 1A).

D. Remove the retaining ring (14). Pull the poppet (40) from the servo body (1 or 1A).

E. Remove the retaining ring (15). Pull the poppet (2) and the guide (6) from the servo body (1 or1A).

F. Remove the E-ring (14) from the poppet (40). Slide the guide (6) off of the poppet. Remove thepackings (9 and 11) from the poppet and the guide.

G. Remove the seat (7) from the servo body (1 or 1A). Remove the packing (10) from the packinggroove of the seat.

H. Remove the bolt (19) and the washer (20) from the servo body (1 or 1A).

I. Do not remove the plugs (17 or 24) from the servo body (1 or 1A) unless there has been leakagearound them.

CLEANING

1. Cleaning Materials

Refer to Table 4 for recommended cleaning materials. Suitable equivalent cleaning materials may besubstituted for the items listed.

2. Cleaning Procedures

WARNING: DRY CLEANING SOLVENT IS FLAMMABLE AND TOXIC TO EYES, SKIN, ANDRESPIRATORY TRACT. SKIN/EYE PROTECTION REQUIRED. AVOID REPEATED/PROLONGED CONTACT. USE ONLY IN WELL VENTILATED AREAS. GOODGENERAL VENTILATION IS NORMALLY ADEQUATE. KEEP AWAY FROM OPENFLAMES OR OTHER IGNITION SOURCES.




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

A. Clean all metal parts by washing thoroughly in dry cleaning solvent. Remove stubborn depositsby scrubbing with a nonmetallic stiff bristle brush. Use a Teflon pick to remove obstructions fromports, 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.DONOT 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.

INSPECTION

1. General

A. Under strong light and magnification, visually check all parts in accordance with the generalcriteria specified in paragraph 2 below.

B. Repair minor damage in accordance with local standard procedures. If damage is major or be-yond simple repair, replace the part rather than attempt any extensive repairs.

2. Component Checks (Refer to Table 5)




Table 5. Component Checks

DESCRIPTION(IPL Figure and Item No.) CHECK CRITERIA

General 1) Visually check all parts as applicable for nicks, cracks, cuts,burrs, corrosion, breaks, scoring, deformation, dents, thread dam-age, or any other obvious defects.

2) Make sure that the ports, passages, recesses and sealinggrooves are clean and unobstructed.

3) Check all sealing and seating surfaces for damage or corrosionwhich would affect sealing.

Servo Body (1-1, 1-1A, 2-1or 2-1A)

Check for: 1) Scoring on the large bore inside diameter.2) Scoring on the seal groove surfaces for the packings. Minor damage may be repaired. Replace an aluminum body if baremetal shows through the anodized surfaces. Replace the body ifthere is extensive scoring, corrosion or other damage.

Poppet (1-2 or 2-40) Replace poppet if the seat face or the stem is worn, scored orcorroded.

Piston (1-5 or 2-5) Replace the piston if there is scoring on the outside diameters of thepiston body.

Compression Spring (1-4) Check for: 1) Deformation or permanent set. 2) Free length of approximately 1.19 inch (30,2 mm).

Compression Spring (2-35) Check for: 1) Deformation or permanent set. 2) Free length of approximately 1.845 inch (46,9 mm).

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 manda-tory replacement parts.




2. Repair Materials

Refer to Table 6 for recommended repair materials. Suitable equivalent repair materials may be substi-tuted for the items listed.

Table 6. Recommended Repair Materials


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 whichdo not meet check requirements and cannot be restored to serviceable condition by allowablerepair.

B. Polish out minor corrosion and surface damage on stainless steel parts with crocus abrasivecloth.

C. Polish out minor scoring on the poppet and the piston with crocus abrasive cloth.

D. After polishing, re-clean parts as specified in the CLEANING section.

E. Clear minor thread damage with a thread restoring tool; replace all threaded components havingcrossed or stripped threads.

ASSEMBLY

1. Replacement Parts

Refer to the IPL section for information on the replacement parts kits.

2. Assembly Materials

Refer to Table 7 for recommended assembly materials. Suitable equivalent materials may be substi-tuted for the items listed.

3. Lubrication

Prior to assembly, LIGHTLY lubricate all of the packings and seals with silicone grease (DC1292).




Table 7. Recommended Assembly Materials


Masking Tape – Commercially available

Sealant, Pipe Thread SWAK Swagelok Corporation29500 Solon RoadSolon, Ohio 44139

Silicone Grease DC1292 Dow Corning Corporation2200 West Salzburg RoadAuburn, Michigan 48611Voice Telephone: 517-496-4388Fax Telephone: 517-496-5324

4. Assembling the Air-Set Servo Assembly (Refer to IPL Figure 1)

CAUTION: DO NOT USE TEFLON TAPE ON THE THREADS OF THE PLUG.

A. If a plug (17 or 24) has been removed, apply a small bead of pipe thread sealant (SWAK) aroundthe threads at the small end of the plug, approximately 1/16-inch (1,5 mm) from the end. Applya bead of sealant along the length of the threaded hole on the servo body (1 or 1A). Install theplug in the servo body and tighten it securely.

B. Install the bolt (19) and the washer (20) in the servo body (1 or 1A). Tighten the bolt securely.

C. Install the packings (12) in the packing grooves of the servo body (1 or 1A).

D. Install the packing (10) in the packing groove of the seat (7). Install the seat in the servo body (1or 1A).

E. Install the packings (9) in the packing grooves of the poppet (2).

F. Install the packing (11) in the packing groove of the guide (6). Install the guide on the poppet (2)and secure it with the E-ring (14).

G. Install the poppet and guide assembly in the servo body (1 or 1A) and secure it with the retainingring (15).

H. Install the piston (5), the spring (4), the shims (33) and the spacer (8) on the poppet (2), andsecure them by installing the E-ring (14).

I. Install the cap (3) in the servo body (1 or 1A) and secure it with the retaining ring (16).




J. Install the orifice (31) and the packings (13) in the ports of the servo body (1 or 1A). Use maskingtape to retain these parts.

5. Assembling the Spring-Set Servo Assembly (Refer to IPL Figure 2)

CAUTION: DO NOT USE TEFLON TAPE ON THE THREADS OF THE PLUG.

A. If a plug (17 or 24) has been removed, apply a small bead of pipe thread sealant (SWAK) aroundthe threads at the small end of the plug, approximately 1/16-inch (1,5 mm) from the end. Applya bead of sealant along the length of the threaded hole on the servo body (1 or 1A). Install theplug in the servo body and tighten it securely.

B. Install the bolt (19) and the washer (20) in the servo body (1 or 1A). Tighten the bolt securely.

C. Install the packing (12) in the packing groove of the servo body (1 or 1A).

D. Install the packing (10) in the packing groove of the seat (7). Install the seat in the servo body (1or 1A).

E. Install the packings (9) in the packing grooves of the poppet (40).

F. Install the packing (11) in the packing groove of the guide (6). Install the guide (6) on the poppet(40), and secure it with the E-ring (14).

G. Install the poppet and guide assembly in the servo body (1 or 1A) and secure it with the retainingring (15).

H. Install the piston (5) on the poppet (40), and secure it by installing the E-ring (14).

I. Install the spring (35) and the retainer (39) in the servo body (1 or 1A).

J. Install the setscrew (38) in the cap (34). Install the cap in the servo body (1 or 1A). Adjust thesetscrew so that it contacts the retainer (39) without compressing the spring (35). Secure the capby installing the retaining ring (16).

L. Install the screw (37) and the washer (36) in the cap (34). Tighten the screw securely.

M. Install the orifice (31) and the packings (13) in the ports of the servo body (1 or 1A). Use maskingtape to retain these parts.




ILLUSTRATED PARTS LIST

1. General

This section lists, describes, and illustrates all detail parts required for maintenance support of theBypass Servo Assembly.

2. Scope of Information

A. The parts list is arranged in the general order of disassembly. The listing is indented to show therelationship between each part and its next higher assembly. Item numbers used in the parts listare 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 otherwisespecified in the DESCRIPTION column. Modification codes used in this manual are listed in thefollowing table.

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 appearanceand location of the part.

2) When the part number is not known: Review the illustrations to identify the part by physi-cal appearance and location. Refer to the accompanying parts list to obtain the part number,description, modification codes, and quantity.

D. Abbreviations

AR Used as required.ASSY Assembly.FIG. Figure.IPL Illustrated Parts List.MOD Modification.




IPL Figure 1. Air-Set Bypass Servo Assembly




FIG.ITEM PART NUMBER

DESCRIPTION1 2 3 4 5 6 7

MODCODES

UNITSPER

ASSY

2691786C/G BASELINE – AIR-SET BYPASS SERVO ASSEMBLIES

1 2691786 SERVO ASSEMBLY, BYPASS . . . . . . . . REF1 011001-101 C BODY, SERVO (Bar Stock) . . . . . . . . . .

(Aluminum alloy)1

011001-102 C BODY, SERVO (Stainless steel) . . . . . . D 1001003-101 C BODY, SERVO (Bar Stock) . . . . . . . . . .

(Aluminum alloy) (Alternate for 011001-101)

1

1A 2691728-1-1 C BODY, SERVO (Casting) . . . . . . . . . . . . (Aluminum alloy) (Alternate for 011001-101)

1

2691728-2-1 C BODY, SERVO (Casting) . . . . . . . . . . . . (Aluminum alloy) (Alternate for 011001-102)

1

2 2691783 C POPPET . . . . . . . . . . . . . . . . . . . . . . . . . 13 2691781 C CAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 F60D1474 C SPRING, COMPRESSION . . . . . . . . . . .

(Wire diameter: 0.120 inch)1

5 2691779-1 C PISTON . . . . . . . . . . . . . . . . . . . . . . . . . 16 2691777-1 C GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2691776-2 C SEAT . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2661058BD008 C PACKING, PREFORMED . . . . . . . . . . . 2

10 C2661058A014 C PACKING, PREFORMED . . . . . . . . . . . 111 C2661058A015 C PACKING, PREFORMED . . . . . . . . . . . 112 2661058BD218 C PACKING, PREFORMED . . . . . . . . . . . 213 C2661058A013 C PACKING, PREFORMED . . . . . . . . . . . 214 X5133-31 C RING, E . . . . . . . . . . . . . . . . . . . . . . . . . 215 N5000-102H C RING, RETAINING . . . . . . . . . . . . . . . . . 116 N5000-125 C RING, RETAINING . . . . . . . . . . . . . . . . . 117 CAN932-2 C PLUG . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 2701361 C BOLT, MACHINE . . . . . . . . . . . . . . . . . . 120 2706580-115 C WASHER, NONMETALLIC (Zytel) . . . . . 124 CAN932-3 C PLUG (Not used on Mod E) . . . . . . . . . . 125 CNAS1352C3-12 C SCREW, CAP, SOCKET HEAD . . . . . . .

(For mounting on main valve)4





MODCODES

UNITSPER

ASSY


2691786C/G BASELINE – AIR-SET BYPASS SERVO ASSEMBLIES

1 26 CMS35333-138 C WASHER, LOCK (For mounting on . . . . . main valve)

4

31 2691787-1 C ORIFICE (0.093 inch inside diameter) . . . C 12691787-7 C ORIFICE (0.062 inch inside diameter) . . . G 1

33 1429-599826 C SHIM (Quantity: 4 maximum) . . . . . . . . . . AR

AIR-SET BYPASS SERVO PARTS KITS AVAILABLE

KIT PART NUMBER DESCRIPTION APPLICATION ITEMS IN KIT (IPL Figure 1)

2702278-3 Seals Air-Set Bypass Servo 9, 10, 11, 12, 13, 14, 15




IPL Figure 2. Spring-Set Bypass Servo Assembly






MODCODES

UNITSPER

ASSY

2691786H/J BASELINE – SPRING-SET BYPASS SERVO ASSEMBLIES

2 2691786 SERVO ASSEMBLY, BYPASS . . . . . . . . . REF1 011001-101 C BODY, SERVO (Bar Stock) . . . . . . . . . . .

(Aluminum alloy)1

011001-102 C BODY, SERVO (Stainless steel) . . . . . . . D 1001003-101 C BODY, SERVO (Bar Stock) . . . . . . . . . . .

(Aluminum alloy) (Alternate for 011001-101)

1

1A 2691728-1-1 C BODY, SERVO (Casting) . . . . . . . . . . . . . (Aluminum alloy) (Alternate for 011001-101)

1

5 2691779-1 C PISTON . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2691777-1 C GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2691776-2 C SEAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2661058BD008 C PACKING, PREFORMED . . . . . . . . . . . . 2

10 2661058A014 C PACKING, PREFORMED . . . . . . . . . . . . 111 2661058A015 C PACKING, PREFORMED . . . . . . . . . . . . 112 2661058BD218 C PACKING, PREFORMED . . . . . . . . . . . . 213 2661058A013 C PACKING, PREFORMED . . . . . . . . . . . . 214 X5133-31 C RING, E . . . . . . . . . . . . . . . . . . . . . . . . . . 215 N5000-102H C RING, RETAINING . . . . . . . . . . . . . . . . . . 116 N5000-125 C RING, RETAINING . . . . . . . . . . . . . . . . . . 117 CAN932-2 C PLUG . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 2701361 C BOLT, MACHINE . . . . . . . . . . . . . . . . . . . 120 2706580-115 C WASHER, NONMETALLIC (Zytel) . . . . . . 124 CAN932-3 C PLUG . . . . . . . . . . . . . . . . . . . . . . . . . . . . E 125 CNAS1352C3-12 C SCREW, CAP, SOCKET HEAD . . . . . . . .

(For mounting on main valve)4

26 CMS35333-138 C WASHER, LOCK (For mounting on . . . . . main valve)

4

31 2691787-1 C ORIFICE (0.093 inch inside diameter) . . . H 12691787-7 C ORIFICE (0.062 inch inside diameter) . . . J 1

34 2881012-101 C CAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 2721715 C SPRING, COMPRESSION . . . . . . . . . . .

(Wire diameter: 0.105 inch)1





MODCODES

UNITSPER

ASSY


2691786H/J BASELINE – SPRING-SET BYPASS SERVO ASSEMBLIES

2 36 2706580-109 C WASHER, NONMETALLIC (Zytel) . . . . . 137 CMS35308-301 C SCREW, MACHINE . . . . . . . . . . . . . . . . 138 1032X1-3/16SS C SETSCREW . . . . . . . . . . . . . . . . . . . . . . 139 2692178 C RETAINER . . . . . . . . . . . . . . . . . . . . . . . J 140 2691783 C POPPET . . . . . . . . . . . . . . . . . . . . . . . . . 1

SPRING-SET BYPASS SERVO PARTS KITS AVAILABLE

KIT PART NUMBER DESCRIPTION APPLICATION ITEMS IN KIT (IPL Figure 2)

2702278-3 Seals Spring-Set Bypass Servo 9, 10, 11, 12, 13, 14, 15

maintenance manual bypass servo assembly ... controls, inc. a meggitt plc company maintenance manual...

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