Emerson Process Management BETTIS G13, BETTIS G01 User Manual

Instruction Manual

Form 5653 February 2007

Bettis Actuators G01 through G13

Bettisr Service Instructions for Models G01 through G13 Pneumatic Actuators

The following instruction manual is for the Bettis Actuator. This instruction manual was prepared by Bettis, a member of the Valve Automation Division of Emerson Process Managementt. Please contact Bettis to ensure that the following instruction manual is the most recent one available.

Do not install, operate, or maintain this product without first D being fully trained and qualified in valve, actuator, and accessory installation, operation and maintenance, and D carefully reading and understanding the contents of this manual. Emerson Process Management is not responsible for the content

of this manual. If you have any questions about these instructions, contact the actuator manufacturer before proceeding.

Note

Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use and maintenance of any product. Responsibility for the selection, use, and maintenance of any product remains with the purchaser and end-user.

www.Fisher.com

D102754X012

Bettis Actuators G01 through G13

Instruction Manual

Form 5653

February 2007

Fisher and Bettis are marks owned by the Emerson Process Management business division of Emerson Electric Co. Emerson Process Management, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.

The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.

Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use and maintenance of any product. Responsibility for the selection, use and maintenance of any product remains with the purchaser and end-user.

Emerson Process Management

Marshalltown, Iowa 50158 USA Cernay 68700 France Sao Paulo 05424 Brazil Singapore 128461

www.Fisher.com

BETTIS

SERVICE INSTRUCTIONS

FOR MODELS

ENGLISH LANUAGE

G01 THROUGH G13

PNEUMATIC ACTUATORS

PART NUMBER: 124840E

REVISION: “B”

DATE: 17 December 2001

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CONTENTS

SECTION 1.0 – INTRODUCTION PAGE

1.1 General Service Information ................................................................... 3

1.2 Definitions ............................................................................................... 4

1.3 General Safety Information ..................................................................... 4

1.4 Bettis Reference Materials ...................................................................... 4

1.5 Service Support Items ............................................................................. 4

1.6 Lubrication Requirements ....................................................................... 5

1.7 General Tool Information ........................................................................ 5

SECTION 2.0 - ACTUATOR DISASSEMBLY

2.1 General Disassembly .............................................................................. 5

2.2 Pneumatic Power Module Disassembly .................................................. 6

2.3 Drive Module Disassembly ..................................................................... 9

2.4 Blind End Cap Module Disassembly ....................................................... 11

2.5 M3 Handwheel or M3 Hex Drive Hub Removal ...................................... 11

2.6 M3 Jackscrew Disassembly .................................................................... 12

2.7 Extended Stop Blind End Cap Disassembly............................................ 13

SECTION 3.0 - ACTUATOR REASSEMBLY

3.1 General Reassembly .............................................................................. 13

3.2 Drive Module Reassembly ...................................................................... 14

3.3 Pneumatic Power Module Reassembly .................................................. 18

3.4 Early G2 And G3 Pneumatic Power Module Reassembly ...................... 22

3.5 Blind End Cap Module Reassembly ........................................................ 24

3.6 M3 Jackscrew Reassembly .................................................................... 25

3.7 M3 Handwheel or M3 Hex Drive Hub Installation ................................... 27

3.8 Extended Stop Blind End Cap Reassembly ............................................ 27

3.9 Actuator Testing ...................................................................................... 28

SECTION 4.0 - FIELD CONVERSIONS

4.1 Fail Mode Reversal (CW to CCW, ect.) .................................................. 28

4.2 Convert Double Acting to Spring Return ................................................. 29

4.3 Convert Spring Return to Double Acting ................................................. 29

4.4 Add An M3 Jackscrew To Blind End Cap Module ...................................... 29

4.5 Add An M3 Jackscrew To Power Module Outer End Cap ........................ 29

4.6 Add An M3 Jackscrew To Spring Module .................................................. 30

4.7 Add An Extended Stop (Es) To Blind End Cap Module .............................. 30

4.8 Add An Extended Stop (Es) To Power Module Outer End Cap ................. 30

4.9 Add An Extended Stop (Es) To Spring Module ........................................... 30

Contents Continued next page

CONTENTS

SECTION 5.0 - MODULE REMOVAL AND INSTALLATION

5.1 Spring Module Removal .......................................................................... 31

5.2 Spring Module Installation ....................................................................... 33

5.3 Pneumatic Power Module Removal ........................................................ 37

5.4 Pneumatic Power Module Installation ..................................................... 37

5.5 G2 Through G13 Powr Swivl Module Removal ...................................... 39

5.6 G2 Through G13 Powr Swivl Module Installation .................................... 39

SECTION 6.0 - ACTUATOR SUPPORT INFORMATION

6.1 Module Weight Table .............................................................................. 40

6.2 G01 Tool Table ....................................................................................... 42

6.3 G2 Tool Table ......................................................................................... 42

6.4 G3 Tool Table ......................................................................................... 43

6.5 G4 Tool Table ......................................................................................... 43

6.6 G5 Tool Table ......................................................................................... 44

6.7 G7 Tool Table ......................................................................................... 44

6.8 G8 Tool Table ......................................................................................... 45

6.9 G10 Tool Table ....................................................................................... 45

6.10 G13 Tool Table ....................................................................................... 46

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SECTION 1 - INTRODUCTION

1.1 GENERAL SERVICE INFORMATION

1.1.1 This service procedure is offered as a guide to enable general maintenance to be performed on Bettis G01XXX, G2XXX, G3XXX, G4XXX, G5XXX, G7XXX, G8XXX, G10XXX, G13XXX Double Acting and Spring Return Series Single Power Module Pneumatic Actuators. This procedure can also be used on Bettis GXX2XX Double Acting Series Twin Power Modules Pneumatic Actuators.

1.1.2 Normal recommended service interval for this actuator series is five years.

NOTE: Storage time is counted as part of the service interval.

1.1.3 This procedure is applicable with the understanding that all electrical power and pneumatic pressure has been removed from the actuator.

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1.1.4 Remove all piping and mounted accessories that will interfere with the module(s) that are to be worked on.

1.1.5 This procedure should only be implemented by a technically competent technician who should take care to observe good workmanship practices.

1.1.6 Numbers in parentheses, ( ) indicate the bubble number (reference number) used on the Bettis Assembly Drawing and Actuator Parts List.

1.1.7 This procedure is written using the stop screw side of the housing (1-10) as a reference and this side will be considered the front side of the actuator. The housing cover (1-20) will be the top of the actuator.

1.1.8 Actuator Module weights are listed in Section 6 Table 6.1.

1.1.9 When removing seals from seal grooves, use a commercial seal removing tool or a small screwdriver with sharp corners rounded off.

1.1.10 Use a non-hardening thread sealant on all pipe threads.

CAUTION: Apply the thread sealant per the manufacture's instructions.

1.1.11 Bettis recommends that disassembly of the actuator modules should be done in a clean area on a workbench.

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1.2 DEFINITIONS

WARNING: If not observed, user incurs a high risk of severe damage to actuator and/or fatal

injury to personnel.

CAUTION: If not observed, user may incur damage to actuator and/or injury to personnel. NOTE: Advisory and information comments provided to assist maintenance personnel to

carry out maintenance procedures.

ES: Extended stop screw (for travel stop adjustment over a full 100° degree travel range).

ES is not intended for use as a manual override.

M3: Manual jackscrew override.

1.3 GENERAL SAFETY INFORMATION Products supplied by Bettis, in its "as shipped" condition, are

intrinsically safe if the instructions contained within this Service Instruction are strictly adhered to and executed by well-trained, equipped, prepared and competent personnel.

WARNING: For the protection of personnel working on Bettis actuators, this procedure

should be reviewed and implemented for safe disassembly and reassembly. Close attention should be noted to the WARNINGS, CAUTIONS and NOTES contained in this procedure.

WARNING: This procedure should not supersede or replace any customer’s plant safety

or work procedures. If a conflict arises between this procedure and the customer’s procedures the differences should be resolved in writing between an authorized customers representative and an authorized Bettis representative.

1.4 BETTIS REFERENCE MATERIALS

1.4.1 Assembly Drawing for G01 through G13 Double Acting One Power Module Pneumatic Series Actuators use part number 116422.

1.4.2 Assembly Drawing for G01 through G13 Double Acting Twin Power Module Pneumatic Series Actuators use part number 115678.

1.4.3 Assembly Drawing for G01 through G13 Spring Return One Power Module Pneumatic Series Actuators use part number 115674.

1.5 SERVICE SUPPORT ITEMS

1.5.1 Bettis Module Service Kit.

1.5.2 For rod extension retainer nut tool part number, refer to the following table. NOTE: These tools are required only when extension rod assembly (1-50) or (9-50) is removed or when a new extension rod assembly is installed.

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ACTUATOR

MODEL

G01 None required G5/G7 117369

G2 123616 G8/G10 117368

G3/G4 117370 G13 122849

1.5.3 Commercial leak testing solution.

1.5.4 Non-hardening thread sealant.

1.6 LUBRICATION REQUIREMENTS

NOTE: Lubricants, other than listed in step 1.6.1 should not be used without prior written approval

of Bettis Product Engineering.

1.6.1. All temperature services (-50°F to +350°F)/(-45.5°C to 176.6°C) use Bettis ESL-5 lubricant. ESL-5 lubricant is contained in the Bettis Module Service Kit in tubes or cans and they are marked ESL-4,5 & 10 lubricant.

1.7 GENERAL TOOL INFORMATION

1.7.1 Tools: All tools/Hexagons are American Standard inch (Imperial). Large adjustable wrench, two (2) large screwdrivers, Allen wrench set, set of open/box-end wrenches, rubber or leather mallet, torque wrench (up to 1600 foot pounds / 2169 N-m), breaker bar, and a drive socket set. For recommended tool and wrench sizes refer to Section 6, Tables

6.2 through 6.10

BETTIS PART

NUMBER

ACTUATOR

MODEL

BETTIS PART

NUMBER

SECTION 2 - ACTUATOR DISASSEMBLY

2.1 GENERAL DISASSEMBLY WARNING: It is possible, that the actuator may contain a dangerous gas and/or liquids. Ensure

that all proper measures have been taken to prevent exposure or release of these types of contaminants before commencing any work.

2.1.1 Section 2 - Actuator Disassembly is written to either completely disassemble the entire actuator or can be used to disassemble individual Modules as needed (Pneumatic Power Module or Drive module, ect.).

WARNING: DO NOT REMOVE SPRING MODULE WHILE SPRING IS COMPRESSED WARNING: ACTUATORS EQUIPPED WITH A SPRING CARTRIDGE MOUNTED M3 JACKSCREW

OR AN EXTENDED STOP (ES) READ WARNING TAG WIRED TO THE SPRING CARTRIDGE COVER PLATE

2.1.2 When the Spring Module is to be removed it should be removed from the Drive Module prior to the Pneumatic Power Module removal or disassembly.

2.1.3 The Pneumatic Power Module can be disassembled while still attached to the Drive Module or the Pneumatic Power Module can be removed from the Drive Module and disassembled separate to the actuator (refer to Section 5 - Module Removal And Installation).

2.1.4 To ensure correct re-assembly; that is, with Pneumatic Power Module or Spring Module on same end of Drive Module as was, mark or tag right (or left) and mark mating surfaces.

2.1.5 For Spring Module removal refer to Section 5 step 5.1.

2.2 PNEUMATIC POWER MODULE DISASSEMBLY

NOTE: 1. Review Section 2 steps 2.1.1 through 2.1.5 General Disassembly before

proceeding with Pneumatic Power Module Disassembly.

2. If the actuator model is a GXX2XX Series (two same size power modules with one

module mounted on each side of the drive module) then do the following steps on both Power Modules simultaneously or complete one power module and then repeat section 2.2 on the second Power Module

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WARNING: If not already removed disconnect all operating pressure from actuator

power cylinders.

WARNING: If the actuator is spring return then the spring cartridge must be checked to

verify that the spring(s) are in their extended position before the Pneumatic Power Module is disassembled from the Drive Module (refer to Section 5.1 through step 5.1.6).

2.2.1 Mark and record location of the ports on outer end cap (3-80) and inner end cap (3-10).

NOTE: If actuator is equipped with a Spring Module complete step 2.2.2. If actuator is a Double

Acting model skip step 2.2.2 and go to step 2.2.3.

2.2.2 Remove breather assembly (12) from outer end cap (3-80).

2.2.3 Refer to assembly drawing page 2 of 2 Detail "E". Remove two socket cap screws (3-130), with lockwasher (3-140), from outer end cap (3-80).

NOTE: If the Power Module is equipped with an M3 jackscrew remove the M3 jackscrew using

Section 2.6.5 for G01 models and Section 2.6.6 for G2 and G3 models.

2.2.4 Outer end cap (3-80) removal as follows:

2.2.4.1 G01 through G13 standard end cap (3-80) removal. Continue at step 2.2.5.

2.2.4.2 G01-M3 JACKSCREW DISASEMBLY FROM OUTER END CAP (3-80)

2.2.4.2.1 Remove M3 handwheel or M3 hex drive hub from M3 (3-290) per Section 2.5.

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2.2.4.2.2 Refer to assembly drawing page 2 of 2 Detail "E". If not already removed unscrew and remove two socket cap screws (3-130), with lockwasher (3-140), from outer end cap (3-80).

2.2.4.2.3 Remove socket cap screw (3-130) with lockwasher (3-140) from keeper (3-360).

2.2.4.2.4 Remove keeper (3-360) from outer end cap (3-80).

2.2.4.2.5 Push jackscrew (3-290) back into the outer end cap far enough so that the jackscrew adapter (3-280) will not interfere with the removal of hex nuts (3-90). Continue at step 2.2.5.

2.2.4.3 G02 & G3-M3 JACKSCREW DISASEMBLY FROM OUTER END CAP (3-80)

2.2.4.3.1 Remove M3 handwheel or M3 hex drive hub from M3 (3-290) per Section 2.5.

2.2.4.3.2 Unscrew and remove hex flat nut (3-300) from G2/G3 M3 jackscrew (3-290).

2.2.4.3.3 Unscrew and remove two socket cap screws (3-320) from G2/G3 M3 adapter (3-280).

2.2.4.3.4 Remove M3 jackscrew (3-290) from outer end cap (3-80). Continue at step 2.2.5.

2.2.5 Remove two tie bar hex nuts (3-90) from outboard side of outer end cap (3-80).

2.2.6 The fit between cylinder (3-70) and outer end cap (3-80) is very tight. Break end cap free by tapping with a breaker bar on lip provided on the end cap. Remove outer end cap (3-80) from cylinder (3-70).

CAUTION: Do not damage o-ring groove when removing end cap from cylinder.

NOTE: When removing cylinder (3-70) off of piston (3-30), tilt the cylinder 15° to 30° degrees with

respect to actuator centerline.

2.2.7 Remove cylinder (3-70) from inner end cap (3-10).

CAUTION: Do not use pipe wrench to remove tie bars.

2.2.8 TIE BAR REMOVAL: NOTE: G01, G2 and G3 models have flats on outboard end of tie bars (3-20) for wrench

placement.

2.2.8.1 Remove G01, G2 and G3 tie bars (3-20) as follows:

2.2.8.1.1 Unscrew tie bars (3-20) from inner end cap (3-10). Pull the tie bars out of the inner end cap far enough to expose the o-ring seals (4-80).

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2.2.8.1.2 Remove o-ring seals (4-80) from the inboard end of tie bars (3-20).

2.2.8.2.3 Remove tie bars (3-20) by pulling the tie bars out and through piston (3-30).

NOTE: G4 models have flats on outboard end of tie bars (3-20) for wrench placement. NOTE: G5 through G13 models have a female square on the out board end of tie bars

(3-20) for wrench placement.

2.2.8.2 Remove G4 through G13 tie bars (3-20) as follows: Unscrew and remove tie bars (3-20) from inner end cap (3-10) and piston (3-30).

2.2.9 Remove piston as follows: (On early G2 and G3 models equipped with outboard and inboard tie bar nuts skip this step and go to step 2.2.11).

2.2.9.1 Refer to assembly drawing page 2 of 2 Detail "D". Remove two split ring halves

(3-50) and one retainer ring (3-60) from outboard side of piston (3-30).

NOTE: Piston (3-30) acts as the retainer for inboard split ring halves (3-50). When removing

the piston be careful to not lose inboard split ring halves (3-50).

2.2.9.2 Remove piston (3-30) and two split ring halves (3-50) from piston rod (3-40).

NOTE: Steps 2.2.10 is used only on early G2 and G3 models equipped with outboard and inboard

tie bar nuts.

2.2.10 Remove early model G2 and G3 pistons as follows:

2.2.10.1Refer to assembly drawing page 2 of 2 Detail "D". Remove two split ring halves

(3-50) and one retainer ring (3-60) from inboard side of piston (3-30).

NOTE: Piston (3-30) acts as the retainer for outboard split ring halves (3-50).

2.2.10.2Slide piston (3-30) toward the inner end cap (3-10) until the out board split ring

halves is exposed enough for removal. Remove outboard split ring halves from piston rod (3-40).

2.2.10.3Remove piston (3-30) and two split ring halves (3-50) from piston rod (3-40).

2.2.11 Remove o-ring seal (4-70) from piston rod (3-40).

2.2.12 Remove hex cap screws (3-100) with lockwashers (3-110) from housing (1-10).

2.2.13 Remove inner end cap (3-10) off of piston rod (3-40).

NOTE: On early model G2 and G3 actuators remove two hex nuts (3-90) from housing (1-10).

These two nuts will be loose after tie bars (3-20) are removed in step 2.2.8.1 and will be located in the area where the piston rod passes through the housing (1-10).

NOTE: The piston rod (3-40) removal as outlined in step 2.2.14 is only required when the piston

rod is being replaced or when the Drive Module is to be disassembled.

2.2.14 Unscrew and remove piston rod (3-40) from drive module.

2.3 DRIVE MODULE DISASSEMBLY

NOTE: Review Section 2 steps 2.1.1 through 2.1.5 General Disassembly before proceeding with

Drive Module Disassembly.

2.3.1 If not already removed remove piston rod (3-40) from drive module.

NOTE: If the actuator is equipped with submerged stop screws with stop screw covers (1-195)

then proceed to and complete steps 2.3.2.1 and 2.3.2.2 prior to doing step 2.3.2.

2.3.2 Mark stop screws (1-180) left and right. The setting of stop screws (1-180) should be checked and setting recorded before stop screws are loosened or removed. NOTE: Stop screws will be removed later in this procedure.

2.3.2.1 Hold stop screw cover (1-195) in place and remove pipe plug (1-260).

2.3.2.2 Hold submerged stop screw (1-180) in place and remove stop screw cover

(1-195).

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NOTE: For steps 2.3.3 through 2.3.10 refer to assembly drawing page 2 of 2 Section A-A, Detail “F”

on drawing part number 115674 and Detail “G” on drawing part number 116422.

2.3.3 Before removing position indicator (1-220), record or mark it's position. Remove position indicator (1-220).

NOTE: Step 2.3.4 is used only on G01, G2 and G3 Drive Modules. Drive Modules G4 through

G13 will skip steps 2.3.4 and continue with step 2.3.5.

2.3.4 Remove one vent check assembly (13) from top of housing cover (1-20).

2.3.5 Unscrew and remove hex cap screws (1-160) with lockwashers (1-170) from yoke cover (1-150).

2.3.6 Remove yoke cover (1-150) from housing cover (1-20).

2.3.7 Mark and record the orientation of the position indicator assembly (1-140) in relation to the top of yoke (1-70).

2.3.8 Remove position indicator assembly (1-140) from top of yoke (1-70).

2.3.9 Remove spring pin (1-100) from top of yoke (1-70).

2.3.10 Remove hex cap screws (1-110), with lockwashers (1-115) from housing cover (1-20).

NOTE: Steps 2.3.11 and 2.3.12 are used only on G7, G8 and G10 Drive Modules. Drive Modules

G01, G2, G3, G4 and G5 will skip steps 2.3.11 and 2.3.12 and continue with step 2.3.13.

2.3.11 Remove hex cap screws (1-120), with lockwashers (1-115), from housing cover (1-20).

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2.3.12 Using hex cap screws (1-110), install into holes vacated by hex cap screws (1-120). Use these hex cap screws to jack the housing cover up for removal. Alternately rotate the hex cap screws clockwise until housing cover (1-20) is clear of housing (1-10).

NOTE: G01, G2, G3 and G4 model housing cover will have cast tabs for placing prying tools to aid

in cover removal.

2.3.13 Remove housing cover (1-20) from housing (1-10).

NOTE: Groove pins (1-130) will remain in housing cover (1-20) when housing cover is removed from

housing (1-10). Groove pins (1-130) should not be removed from housing cover (1-20) unless they are damaged and require new replacements.

2.3.14 Refer to assembly drawing page 2 of 2 Detail "B". Remove guide bar (1-90) from housing (1-10).

2.3.15 Remove top yoke pin thrust bearing (2-10) from top of yoke pin (1-80).

2.3.16 Rotate the arms of yoke (1-70) to the center position of housing (1-10).

2.3.17 Remove yoke (1-70) with yoke pin (1-80), guide block (1-30) and two yoke/guide block bushings (2-30), by lifting yoke up and out of the housing (1-10).

2.3.18 Remove bottom yoke pin thrust bearing (2-10) from inside bottom of housing (1-10).

2.3.19 Remove yoke pin (1-80) by inserting 3/8"-16 UNC screw into top of the yoke pin and pull straight up and out.

2.3.20 Remove guide block (1-30) from between the arms of yoke (1-70).

2.3.21 Remove yoke/guide block bushing (2-30) from top of guide block (1-30).

2.3.22 Remove yoke/guide block bushing (2-30) from the top of the lower yoke arm of yoke (1-70).

NOTE: G01 model actuators skip steps 2.3.23 through 2.3.25 and continue disassembly at step

2.3.26.

2.3.23 Refer to assembly drawing page 2 of 2 Detail "B". Use Bettis tool part numbers 117368 (G8/G10), 117369 (G5/G7), 117370 (G3/G4), 122849 (G13) or 123616 (G2) and remove retention retainer nut assemblies (1-60) from guide block (1-30). On spring return actuators also remove retention retainer nut assemblies (9-60).

2.3.24 Remove rod extension assembly (1-50) from guide block (1-30). On spring return actuators also remove rod extension assembly (9-50).

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NOTE: One spherical washer (1-40) will be removed from guide block (1-30) when extension rod

assembly is removed. On spring return actuators also one spherical washer (9-40) will be removed from guide block (1-30).

2.3.25 Remove the remaining spherical washer (1-40) from guide block (1-30). On spring return actuators also remove the remaining spherical washer (9-40) from guide block (1-30).

2.3.26 Unscrew and remove two stop screw nuts (1-190) from stop screws (1-180).

2.3.27 Unscrew and remove two stop screws (1-180) from front of housing (1-10).

2.3.28 Housing (1-10) vent check assembly removal as follows:

2.3.28.1 G01, G2 and G3 housing (1-10) unscrew and remove one vent check

assembly (13) from the front of housing (1-10).

2.3.28.2 G4 through G13 housing (1-10) unscrew and remove two vent check

assembly’s (13) from the front of housing (1-10).

2.3.29 The following items do not need to be removed from their assembled locations unless being replaced by new items: Two guide bar bearings, two yoke bearings (2-40), yoke pin bearing and yoke pin thrust bearing (2-10).

2.4 BLIND END CAP MODULE REMOVAL

2.4.1 Remove hex cap screws (5-20), with spring lockwashers (5-30), from blind end cap (5-10).

2.4.2 Remove blind end cap (5-10) from end of housing (1-10).

2.5 M3 HANDWHEEL OR M3 HEX DRIVE HUB REMOVAL

2.5.1 M3 HANDWHEEL OR HEX DRIVE HUB REMOVAL FROM M3 STUD.

2.5.1.1 Using pin punch drive out two grooved pins (10-20) and (10-30) from handwheel

hub or hex drive hub (10-10).

2.5.1.2 Remove handwheel or hex drive hub (10-10) from M3 stud (5-50).

2.5.2 EARLY MODEL G2 & G3 M3 HANDWHEEL AND HEX NUT REMOVAL FROM JACKSCREW

2.5.2.1 Remove hex nut, lockwasher from M3 jackscrew.

2.5.2.2 Remove handwheel from M3 jackscrew.

2.5.2.3 Using pin punch drive out spiral pin from outboard end of M3 jackscrew.

2.5.2.4 Remove hex nut from M3 jackscrew, and handwheel.

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