Emerson Bettis M18 User manual

Installation, Operation and Maintenance Manual
VA-DC-000-1879 Rev. 0
April 2021
Bettis M18 Manual Hydraulic Override System
For HD, T, and G-Series Pneumatic and Hydraulic Actuators

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Installation, Operation and Maintenance Manual
VA-DC-000-1879 Rev. 0
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Notes

Installation, Operation and Maintenance Manual
VA-DC-000-1879 Rev. 0
Table of Contents
April 2021
iTable of Contents
Table of Contents
Section 1: Introduction
1.1 General M18 Service Information .................................................................. 1
1.2 Definitions .................................................................................................... 2
1.3 General Safety Information ........................................................................... 2
1.4 Fluid Requirements ....................................................................................... 3
1.5 Bettis Reference Materials ............................................................................. 3
Section 2: General Information
2.1 Actuator Power Operation............................................................................. 4
2.2 Actuator M18 Manual Hydraulic Operation ................................................... 4
Section 3: M18 System Fluid Filling Instructions
3.1 Double-Acting Actuator M18 System Fluid Filling.......................................... 5
3.2 Spring-Return Actuators M18 System Fluid Filling ......................................... 8
3.3 Priming M18 in the Field.............................................................................. 11
Section 4: M18 Disassembly Instructions
4.1 M18 Pressure Release Instructions .............................................................. 12
4.2 M18 Reservoir Disassembly Instructions...................................................... 12
4.3 M18 Pump Disassembly Instructions........................................................... 13
Section 5: M18 Reassembly Instructions
5.1 M18 General Reassembly Instructions ......................................................... 16
5.2 M18 Reservoir Reassemble Instructions ...................................................... 16
5.3 M18 Pump Reassembly Instructions............................................................ 17
Appendix A: List of Drawings
A.1 Part No. VA-ED-005-1120, M18 Assembly Drawing, Sheet 1 of 7................. 20
A.2 Part No. VA-ED-005-1120, M18 Assembly Drawing, Sheet 2 of 7................. 21
A.3 Part No. VA-ED-005-1120, M18 Assembly Drawing, Sheet 3 of 7................. 22
A.4 Part No. VA-ED-005-1120, M18 Assembly Drawing, Sheet 4 of 7................. 23
A.5 Part No. VA-ED-005-1120, M18 Assembly Drawing, Sheet 5 of 7................. 24
A.6 Part No. VA-ED-005-1120, M18 Assembly Drawing, Sheet 6 of 7................. 25
A.7 Part No. VA-ED-005-1120, M18 Assembly Drawing, Sheet 7 of 7................. 26

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Installation, Operation and Maintenance Manual
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1
Section 1: Introduction
Introduction
Section 1: Introduction
1.1 General M18 Service Information
1.1.1 M18 is a compact modular hydraulic override system designed for use with
Bettis Double-Acting and Spring-Return Actuators. The system incorporates
a piston type hand pump and a fluid reservoir.
NOTE:
The M18 fluid reservoir is required because of the hydraulic cylinder differential, which is
due to the inboard piston rod displacement.
1.1.2 MAINTENANCE:
1.1.2.1 Bettis does not recommend periodic field maintenance for the
M18 Manual Hydraulic Override System (pump and reservoir).
1.1.2.2 The only time the M18 Manual Hydraulic Override System should be
disassembled is when either the pump or the reservoir fails to perform
its manual hydraulic override function.
1.1.2.3 When possible the M18 package should be returned to the factory
for maintenance.
1.1.3 Numbers in parentheses ( ), indicate the bubble number (reference number) used
on the Bettis Assembly Drawing VA-ED-005-1120.
NOTE:
Do not use Teflon tape on M18 system threads.
1.1.4 Use a non-hardening thread sealant on all system threads.
! CAUTION
Apply thread sealant per the manufacturer’s instructions.

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Section 1: Introduction
Introduction
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.
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 a well-trained, equipped, prepared and competent technician.
! WARNING
For the protection of personnel working on Bettis actuators, this procedure should be
reviewed and implemented for safe operation. Close attention should be noted to the
WARNINGS, CAUTIONS and NOTES contained in this procedure.
NOTE:
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 customer representative
and an authorized Bettis representative.

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Section 1: Introduction
Introduction
1.4 Fluid Requirements
M18 Manual Hydraulic Override System Fluid Requirements: Hydraulic fluids, other than
those listed in steps 1.4.1 and 1.4.2, should not be used without prior written approval of
Bettis Product Engineering.
1.4.1 Standard and high temperature service (-20 °F to +350 °F) use Shell Tellus T-32
Automatic Transmission Fluid.
1.4.2 Low temperature service (-40 °F to +150 °F) Use Exxon Univis J13 or
HVI 13 Hydraulic Fluid.
1.5 Bettis Reference Materials
1.5.1 Bettis M18 System Assembly drawing part number VA-ED-005-1120
(attached to the end of the document).
1.5.2 M18 with auto reset module and remote mounting module use the same
assembly drawing VA-ED-005-1120.

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Section 2: General Information
General Information
Section 2: General Information
2.1 Actuator Power Operation
! CAUTION
Power operation of the actuator with the M18 control knob in any other position than
“AUTO” will cause fluid to overflow in the reservoir.
2.1.1 Place the M18 control knob (25 - 200) in the Auto position (middle position).
NOTE:
The control knob (25 - 200) is in front and at the bottom of the M18 pump.
! WARNING
Do not exceed the maximum operating pressure rating of the actuator.
2.1.2 Apply an operating media, of the correct pressure, through a control valve to the
actuator's power cylinder.
2.2 Actuator M18 Manual Hydraulic Operation
2.2.1 Shut off and exhaust the operating media from both sides of the actuator’s
power cylinder.
2.2.2 M18 Manual Hydraulic Operation as follows:
2.2.2.1 Double-Acting Actuators – Select actuator rotation desired by placing
the control knob (25 - 200) in the Manual CW or Manual CCW position.
2.2.2.2 Spring-Return Actuators – Place the control knob (25 - 200) in the
Manual position.
2.2.3 Operate the M18 pump handle until required valve position is reached.
NOTE:
When the actuator is fully stroked against the travel stops, an increased resistance in
pumping effort will be noticed. Continued operation of the pump simply circulates fluid
through a relief valve.

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Section 3: M18 System Fluid Filling Instructions
M18 System Fluid Filling Instructions
Section 3: M18 System Fluid Filling Instructions
3.1 Double-Acting Actuator M18 System
Fluid Filling
Use either Filling Method Number 1 (steps 3.1.2) or Filling Method Number 2
(steps 3.1.3). Method number 1 is the best, most efficient and the recommended method.
3.1.1 Actuator position as follows:
3.1.1.1 Pneumatic and Hydraulic T-Series Actuators:
Apply pneumatic or hydraulic pressure to the inlet port located in the
outer end cap of the actuators power cylinder, placing the actuator in
the counterclockwise (CCW) position and proceed to step 3.1.2.
3.1.1.2 Hydraulic G-Series Actuators:
Apply pneumatic or hydraulic pressure to the inlet port located in
the inner end cap of the actuators power module (cylinder), placing
the actuator in the counterclockwise (CCW) position and proceed to
step 3.1.2.
3.1.1.3 Pneumatic G and HD-Series Actuators:
Apply pneumatic pressure to the inlet port located in the inner end cap
of the actuators power module (cylinder), placing the actuator in the
clockwise (CW) position and proceed to step 3.1.2.
3.1.2 Filling Method Number 1
Filling of the M18 Manual Hydraulic Override System is best accomplished using a
pressure pump.
NOTE:
If a pressure pump is not available go to step 3.1.3 (method number 2) for the manual field
service filling procedure.
3.1.2.1 Shut off and exhaust the operating media from the actuator’s
power cylinder.
3.1.2.2 Remove the bleed plugs from the following locations:
3.1.2.2.1 G-Series Actuators remove plug from the top of the outer
and inner end caps of the hydraulic override cylinder.
3.1.2.2.2 T-Series Actuators remove pipe plugs from the top area
located on the outer and inner end caps of the hydraulic
override cylinder.
3.1.2.2.3 HD-Series Actuators remove pipe plug from the top area on
the outer end caps of the hydraulic override cylinder and the
cylinder adapter.

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Section 3: M18 System Fluid Filling Instructions
M18 System Fluid Filling Instructions
3.1.2.3 Connect the pump motor hose to fitting hole located on the reservoir
top end cap (10 - 10), keep pipe plug on the other hole.
! CAUTION
The M18 pump handle lever (20 - 10 - 90) should be in the up position and the pump
handle (30 - 70) should be removed from the pump handle lever (20 - 10 - 90).
3.1.2.4 Place the M18 pump control knob in the “Auto” position.
! CAUTION
The pressure pump should not exceed 20 psi when force filling the M18 Hydraulic System.
3.1.2.5 Start pumping the hydraulic fluid into the system with the pump motor.
3.1.2.6 When hydraulic fluid appears at the vacant bleed plug port hole located
in the inboard area of the hydraulic override cylinder install pipe plug
into the vacant port hole.
NOTE:
Use pipe dope on the bleed pipe plug.
3.1.2.7 When hydraulic fluid appears at the vacant bleed plug port hole located
in the outboard area of the hydraulic override cylinder stop the pump
motor and install pipe plug into the vacant port hole.
NOTE:
Use pipe dope on the bleed pipe plug.
3.1.2.8 Disconnect the pump motor from the M18 reservoir.
3.1.2.9 Run 1-2 cycles for hydraulic override module and fill reservoir to 1 - 1/2
inches from the top of the reservoir, after redundant fluid bleeds out of
the reservoir.
NOTE:
Add fluid to the reservoir through the open port left vacant in step 3.1.2.8.
3.1.2.10 Apply pipe dope to breather (10 - 90) threads and install it into the port
on top of the reservoir upper end cap (10 - 10).
3.1.2.11 Return the M18 pump control knob to the “Auto” position. With the M18
control knob in the “Auto” position the actuator is ready for service.

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Section 3: M18 System Fluid Filling Instructions
M18 System Fluid Filling Instructions
3.1.3 Refilling Method Number 2
Refilling the M18 Manual Hydraulic Override System without using a pump motor.
3.1.3.1 Remove breather (10 - 90) from the top of the reservoir end cap (10 - 10).
3.1.3.2 Remove the bleed plugs from the following locations:
NOTE:
Only remove the pipe plugs located at the highest points, in the vertical plane, of the
hydraulic override cylinder.
3.1.3.2.1 G-Series Actuators remove plug from the top of the outer
and inner end caps of the hydraulic override cylinder.
3.1.3.2.2 T-Series Actuators remove pipe plugs from the top area
located on the outer and inner end caps of the hydraulic
override cylinder.
3.1.3.2.3 HD-Series Actuators remove pipe plug from the top area
on the outer end caps of the hydraulic override cylinder and
the cylinder adapter.
3.1.3.3 Place the M18 pump control knob in the “Manual” position.
! CAUTION
Never allow the M18 reservoir to be pumped dry of hydraulic fluid.
3.1.3.4 Fill reservoir to 1 - 1/2 inches from top of reservoir end cap (10 - 10).
NOTE:
Add fluid to the reservoir through the open port left vacant in step 3.1.3.1.
3.1.3.5 Start pumping the hydraulic fluid into the system with the
M18 pump handle switch the control knob to the other "Manual"
position when hydraulic fluid appears at one of the vacant pipe
plug port, refill the reservoir with fluid as needed to prevent the pump
being operated without fluid.
3.1.3.6 Stop pumping the M18 pump handle when hydraulic fluid appears
at both vacant pipe plug ports located in the actuator’s hydraulic
override cylinder.
3.1.3.7 Apply pipe dope onto pipe plug threads and install into the vacant pipe
plug ports at both vacant pipe plug ports located in the actuator’s
hydraulic override cylinder.
3.1.3.8 Fill the M18 reservoir 1 - 1/2 inches from the top of the reservoir.
3.1.3.9 Apply pipe dope to the breather (10 - 90) threads and install into the
port on top of the reservoir upper end cap (10 - 10).

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Section 3: M18 System Fluid Filling Instructions
M18 System Fluid Filling Instructions
3.2 Spring-Return Actuators M18 System
Fluid Filling
Actuator position as follows:
Apply air to port on power module inner end cap move the actuator to opposition direction
and compress the spring. Apply air to port on the outer end cap of hydraulic override
cylinder to extend the ram.
Use either Refilling Method Number 1 (steps 3.2.1) or Refilling Method Number 2
(steps 3.2.2).
NOTE:
Method Number 1 is the best, most efficient and the recommended method.
For sizes G01 to G5, T, HD series
3.2.1 Refilling Method Number 1
Refilling of the M18 Manual Hydraulic Override System is best accomplished using
a pump motor.
NOTE:
If a pump motor is not available go to step 3.2.2 (Method number 2) for the manual field
service refilling procedure.
3.2.1.1 Actuator hydraulic override cylinder pipe plug removal.
3.2.1.1.1 G-Series – Remove one pipe plug from the spring cartridge
hydraulic override outer end cap.
3.2.1.1.2 HD and T-Series – Remove the pipe plugs from the actuator
hydraulic override cylinder outer and inner end.
NOTE:
Only remove the pipe plugs located at the highest points, in the vertical plane, of the
hydraulic override cylinder.
3.2.1.2 Connect the pump motor hose to fitting hole located on the reservoir
top end cap (10 - 10), keep pipe plug on the other hole.
3.2.1.3 Place the M18 pump control knob in the “Auto” position.
NOTE:
The pressure pump should not exceed 20 psi when force filling the M18 hydraulic system.

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Section 3: M18 System Fluid Filling Instructions
M18 System Fluid Filling Instructions
3.2.1.4 Start pumping the hydraulic fluid into the system with the pump motor.
3.2.1.5 Stop the pump motor when hydraulic fluid appears as follows:
3.2.1.5.1 G-Series - At the vacant pipe plug port located in the
hydraulic override end cap.
3.2.1.5.2 HD and T-Series - At both vacant pipe plug port located in
the actuator’s hydraulic override cylinder.
3.2.1.6 Apply pipe dope onto pipe plug threads and install into the vacant pipe
plug port as follows:
3.2.1.6.1 G-Series - At the vacant pipe plug port located in the
hydraulic override end cap.
3.2.1.6.2 HD and T-Series - At both vacant pipe plug ports located in
the actuator’s hydraulic override cylinder.
3.2.1.7 Disconnect the pump motor from the M18 reservoir.
3.2.1.8 Stop the air on the power module, wait the spring back to 0°.
3.2.1.9 Fill reservoir to 1 - 1/2 inches from top of reservoir end cap (10 - 10) after
redundant fluid bleeds out of the reservoir.
NOTE:
Add fluid to the reservoir through the open port left vacant in step 3.2.1.7.
3.2.1.10 Apply pipe dope to breather threads and install breather (10 - 90) into
port vacated in step 3.2.1.7.
3.2.2 Refilling Method Number 2
Refilling the M18 Manual Hydraulic Override System without using a pump motor.
3.2.2.1 Remove breather (10 - 90) from the top of the reservoir end cap (10 - 10).
3.2.2.2 Actuator hydraulic override cylinder pipe plug removal.
3.2.2.2.1 G-Series – Remove one pipe plug from the spring cartridge
hydraulic override outer end cap.
3.2.2.2.2 HD and T-Series – Remove the pipe plugs from the actuator
hydraulic override cylinder outer and inner end.
NOTE:
Only remove the pipe plugs located at the highest points, in the vertical plane, of the
hydraulic override cylinder.
3.2.2.3 Place the M18 pump control knob in the “Manual” position.

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Section 3: M18 System Fluid Filling Instructions
M18 System Fluid Filling Instructions
! CAUTION
Never allow the M18 reservoir to be pumped dry of hydraulic fluid.
3.2.2.4 Fill reservoir to 1 - 1/2 inches from top of reservoir end cap (10 - 10).
NOTE:
Add fluid to the reservoir through the open port left vacant in step 3.2.2.1.
3.2.2.5 Start pumping the hydraulic fluid into the system with the
M18 pump handle.
3.2.2.6 Stop pumping the M18 pump handle when hydraulic fluid appears
as follows:
3.2.2.6.1 G-Series - At the vacant pipe plug port located in the
hydraulic override end cap.
3.2.2.6.2 HD and T-Series - At both vacant pipe plug ports located in
the actuator’s hydraulic override cylinder.
3.2.2.7 Apply pipe dope onto pipe plug threads and install into the vacant pipe
plug port as follows:
3.2.2.7.1 G-Series - At the vacant pipe plug port located in the
hydraulic override end cap.
3.2.2.7.2 HD and T-Series - At both vacant pipe plug port located in
the actuator’s hydraulic override cylinder.
3.2.2.8 Stop the air on the power module, wait the spring back to 0°.
3.2.2.9 Fill the M18 reservoir 1 - 1/2 inches from the top of the reservoir after
redundant fluid bleeded out of the reservoir.
3.2.2.10 Apply pipe dope to the breather (10 - 90) threads and install into the
port on top of the reservoir upper end cap (10 - 10).
For sizes G7+
3.2.3 Refilling Method Number 1
Refilling of the M18 Manual Hydraulic Override System is best accomplished using
a pump motor.
NOTE:
If a pump motor is not available go to step 3.2.2 (Method number 2) for the manual field
service refilling procedure.
3.2.3.1 Remove one pipe plug from the spring cartridge hydraulic override
outer end cap.
NOTE:
Only remove the pipe plugs located at the highest point, in the vertical plane, of the
hydraulic override cylinder.

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Section 3: M18 System Fluid Filling Instructions
M18 System Fluid Filling Instructions
3.2.3.2 Stroke actuator using power module operating fluid to the fully stroked
position and lock in place.
3.2.3.3 Connect pump motor hose to fitting hole on the reservoir top end cap
(10 - 10), keep pipe plug on the other hole.
3.2.3.4 Place the M18 pump knob in the auto position.
NOTE:
The pressure pump should not exceed 50 psi when force filling the M18 hydaulic system.
3.2.3.5 Start pumping the hydraulic fluid into the system with the pump motor.
3.2.3.6 Stop the pump motor when hydraulic fluid appears at the vacant pipe
plug port located in the hydraulic override end cap.
3.2.3.7 Apply pipe dope onto pipe plug threads and install into the vacant pipe
plug port at the vacant pipe plug port located in the hydraulic override
end cap.
3.2.3.8 Start pump motor to stroke the hydraulic ram to its fully
extended position.
3.2.3.9 Place the M18 pump control knob in the “Manual” position. Install the
handle to M18 pump and do 2-3 stroke, make sure the hydraulic piston
rod touches the tension rod. Shut off and exhaust the operating media
from the actuator’s power cylinder, and check the actuator position
indicator if happen changes.
3.2.3.10 Remove the breather (10 - 90) from the top of the reservoir upper end
cap (10 - 10).
3.2.3.11 Stop the air on the power module, wait for the spring to return to 0°.
3.2.3.12 Fill reservoir to 1 - 1/2 inches from top of reservoir end cap (10 - 10)
after redundant fluid bleeded out of the reservoir.
3.3 Priming M18 in the Field
3.3.1 Pull the Quick Release Pin (20 - 10 - 110) connected to Cable Assembly
(20 - 10 - 230).
3.3.2 Rotate the Pump Handle Lever (20 - 10 - 90) 180° to get it out of the way.
3.3.3 Use a 13/16” open end wrench to keep the Pump Rod (20 - 50) from rotating while
you use a 3/16” hex Allen wrench to loosen 1/8" Pipe Plug (20 - 10 - 210). It needs
to be loosened to allow trapped air to be pumped out the Pump Rod (20 - 10 - 50).
3.3.4 Reattach the Pump Handle Lever (20 - 10 - 90) to the Pump Rod (20 - 10 - 50) with
the Quick Release Pin (20 - 10 - 110).
3.3.5 Pump until all air is out of the Pump Rod (20 - 10 - 50) and you are getting clear
fluid coming out around the Pipe Plug (20 - 10 - 210).
3.3.6 Stop pumping – pull the Quick Release Pin (20 - 10 - 110) – use the 3/16” hex Allen
wrench and 13/16” open end wrench to tighten the 1/8" Pipe Plug (20 - 10 - 210).
3.3.7 Reinstall the Quick Release Pin (20 - 10 - 110) connecting the Pump Handle Lever
(20 - 10 - 90) to the Pump Rod (20 - 10 - 50).
3.3.8 You should have a good prime now and be able to pump the M18 to complete
your override job.

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Section 4: M18 Disassembly Instructions
M18 Disassembly Instructions
Section 4: M18 Disassembly Instructions
4.1 M18 Pressure Release Instructions
NOTE:
Shut off and exhaust the operating media from both sides of the actuator’s power cylinder.
4.1.1 Place the M18 control knob (25 - 200) in the Auto position (middle position).
NOTE:
Control knob (25 - 200) is located in front and at the bottom of the M18 pump manifold
(20 - 10 - 10).
NOTE:
Using a means of capturing the hydraulic fluid that will be lost during the following steps.
Use a bucket, tub, and large container, etc. For remote mounting option, before removing
the pump hose / tube fitting, press and hold plug (90 - 20) to release fluid pressure
G and T-Series Actuators there is 250 psi pressure and HD-Series Actuator there is
33 psi pressure.
4.1.2 Remove the 1/4” pipe plug (10 - 80) from the reservoir bottom end cap (10 - 40).
4.1.3 Place the M18 control knob (25 - 200) in the Manual position.
4.1.4 Remove all the M18 pump assembly piping; SS Tubing (50) with male connector (40).
4.2 M18 Reservoir Disassembly Instructions
NOTE:
Review Section 4.1, M18 Pressure Relief Instructions for remote mounting option before
proceeding with reservoir disassembly.
4.2.1 Remove piping from port located in bottom end cap (10 - 40).
4.2.2 Remove breather (10 - 90) from upper end cap (10 - 10).
4.2.3 Remove acorn nut (10 - 50) from upper end cap (10 - 10).
4.2.4 Loosen socket cap screws (30 - 20) and remove the M18 reservoir (10) from the
M18 mounting bracket (30 - 90).
4.2.5 Remove Thread Seal (10 - 70) and washer (10 - 60) from upper end cap (10 - 10).

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Section 4: M18 Disassembly Instructions
M18 Disassembly Instructions
4.2.6 Remove the upper end cap (10 - 10) from center bar assembly (10 - 30).
4.2.7 Remove bottom end cap (10 - 40) from M18 cylinder (10 - 20) and center bar
assembly (10 - 30).
4.2.8 For remote mounting option, if required for replacement or maintenance remove
check valves (90 - 30) and (90 - 60) from housing (90 - 10).
4.3 M18 Pump Disassembly Instructions
NOTE:
Review Section 4.1, M18 Pressure Relief Instructions before proceeding with
M18 pump disassembly.
4.3.1 Place the M18 control knob (25 - 200) in the Auto position (middle position).
NOTE:
Control knob (25 - 200) is located in front and at the bottom of the M18 pump manifold
(20 - 10 -10).
NOTE:
Using a means of capturing the hydraulic fluid that will be lost during the following steps,
i.e. a bucket, tub, large container, etc.
4.3.2 Refer to assembly drawing sheet 1. Remove all the M18 pump assembly piping -
male connector (40), and Tubing (50).
NOTE:
If the M18 pump is equipped with Auto Reset, refer to assembly drawing sheet 6 and do
steps 4.3.3 and 4.3.4. If not equipped with Auto Reset skip steps 4.3.3 and 4.3.4.
4.3.3 Remove male swivel elbow (80 - 20) from Air Reset Cylinder (80 - 90).
4.3.4 Remove two socket cap screws (80 10) from bracket (80 - 50) and back
brace (20 - 10 - 130).
4.3.5 Refer to assembly drawing sheet 1. Remove four socket cap screws (30 - 110) that
retains the mounting bracket (30 - 90) to actuator housing and then remove
M18 pump assembly / bracket.
4.3.6 Refer to assembly drawing sheet 1. Remove four countersunk socket flat screws
(30 - 100) that mounts mounting bracket (30 - 90) to pump manifold (20 - 10 - 10).
4.3.7 Remove the M18 pump assembly from the M18 mounting bracket (30 - 90).

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Section 4: M18 Disassembly Instructions
M18 Disassembly Instructions
4.3.8 Remove acorn nut (25 - 450) from the control knob (25 - 200) and separate the
control knob (25 - 200) from valve stem (20 - 10 - 280).
4.3.9 Refer to assembly drawing sheet 3. Remove four cap screws (25 - 240) from pump
cover (25 - 240) and detach the cover from manifold (20 - 10 - 10).
4.3.10 Remove two orifice check valves (20 - 10 - 260) from the manifold (2 - 10 - 10).
4.3.11 Refer to assembly drawing sheet 1. Remove two check valves (20 - 10 - 40) and one
check valve (20 - 10 - 270) from the manifold (20 - 10 - 10).
4.3.12 Remove the relief valve (20 - 10 - 30) from bottom of the M18 manifold (20 - 10 -10).
NOTE:
There will be further fluid lost when the valves are removed.
NOTE:
In step 4.3.13 and 4.3.17 pump handle lever (20 - 10 - 90), pump rod (20 - 10 - 50), and
associated parts will be removed from pump cylinder (20 - 10 - 20).
4.3.13 Remove quick release pin (20 - 10 - 110) from pump handle lever (20 - 10 - 90) and
pump rod (20 - 10 - 50).
4.3.14 Pull the pump rod (20 - 10 - 50) up out of the pump cylinder (20 - 10 - 20) using a
slight twisting back and forth motion.
4.3.15 Refer to assembly drawing sheet 3. Remove retainer ring (20 - 10 - 80) from the
manifold (20 - 10 -10).
4.3.16 Pull the cylinder pin (20 - 10 - 60) out of from the manifold (20 - 10 - 10) using a
1/4” - 20 UNC screw.
4.3.17 Remove the cylinder (20 - 10 - 20) from the manifold (20 - 10 - 10).
NOTE:
If the M18 pump is equipped with Auto Reset then do steps 4.3.18 and 4.3.19 and refer to
assembly drawing sheet 6. If not equipped with Auto Reset skip steps 4.3.18 and 4.3.19.
4.3.18 Remove one retainer ring (80 - 80) from auto reset pivot pin (80 - 70) located on
the pump cover (25 - 140).
4.3.19 Remove air reset cylinder (80 - 90) from auto reset pivot pin (80 - 70) located on
the pump cover (25 - 140).
4.3.20 Remove the button head screw (25 - 430) and hex nut (25 - 440) from the position
label (25 - 160).
4.3.21 Remove position label (25 - 160) from the pump cover (25 - 140).
NOTE:
4.3.20 and 4.3.21 Steps only required if converting from DA to SR, and vice versa.

Installation, Operation and Maintenance Manual
VA-DC-000-1879 Rev. 0 April 2021
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Section 4: M18 Disassembly Instructions
M18 Disassembly Instructions
4.3.22 Remove the screws (20 - 10 - 100) that retain the back brace (20 - 10 - 130) to the
M18 manifold (20 - 10 - 10).
4.3.23 Remove pipe plug (20 - 10 - 210), spring (20 - 10 - 360) and ball (20 - 10 - 350)
from manifold (20 - 10 - 10)
4.3.24 Remove the control valve stem (20 - 10 - 280), rotor (20 - 10 - 300), and back plate
(20 - 10 - 320) from the M18 manifold (20 - 10-10).
NOTE:
Use plastic mallet tap lightly end of the control valve stem (20 - 10 - 280), while holding the
back plate (20 - 10 - 320) to prevent it from pop-up by the spring (20 - 10 - 390).
4.3.25 Remove spring pin (20 - 10 - 340) from control valve rotor (20 - 10 - 300).
4.3.26 Refer to assembly drawing sheet 3. Remove flat head screws (20 - 10 - 330) from
the M18 manifold (20 - 10 - 10) and remove the control valve disc (20 - 10 - 290)
and O-rings (20 - 20 - 40).

April 2021
Installation, Operation and Maintenance Manual
VA-DC-000-1879 Rev. 0
16
Section 5: M18 Disassembly Instructions
M18 Disassembly Instructions
Section 5: M18 Reassembly Instructions
5.1 M18 General Reassembly Instructions
! CAUTION
Only new seals that are still within the seal’s expectant shelf life should be install into Bettis
product being refurbished.
5.1.1 Remove and discard all old seals.
5.1.2 All parts should be cleaned to remove all dirt and other foreign material prior
to inspection.
5.1.3 All parts should be thoroughly inspected for excessive wear, stress cracking,
galling and pitting. Attention should be directed to threads, sealing surfaces and
areas that will be subjected to sliding or rotating motion. Sealing surfaces of the
manifold (20 - 10 - 10) and pump rod (20 - 10 - 50) must be free of deep scratches,
pitting, corrosion and blistering or flaking coating.
! CAUTION
Parts that reflect any of the above listed characteristics should be replaced with new parts.
5.1.4 Before installation, coat all moving parts with a complete film of lubricant. Coat all
seals with a complete film of lubricant, before installing into seal grooves.
NOTE:
The parts and seals used in the actuator will be assembled using lubricant as identified in
Section 1, step 1.5.1.
5.2 M18 Reservoir Reassemble Instructions
NOTE:
Review Section 5.1, General Reassembly Instructions before proceeding with
reservoir reassembly.
5.2.1 Refer to the assembly drawing sheet 4. If disassembled, reassemble the
following item:
5.2.2 Screw bottom end cap (10 - 40) onto center bar assembly (10 - 30).