MSA AirHawk II Setup guide

MSAsafety.com
Maintenance and Repair
AirHawk® II Air Mask
Second Stage Regulator
Order No.: 10104241/02
Prnt. Spec. 10000005389(I)

1000 Cranberry Woods Drive
Cranberry Township, PA 16066
USA
Phone 1-800-MSA-2222
Fax [phone]
For your local MSA contacts please go to our website www.MSAsafety.com
© MSA 2018. All rights reserved
WARNING!
Read this manual carefully before servicing the device. The device will perform as designed only if it is used
and maintained in accordance with the manufacturer's instructions. Otherwise, it could fail to perform as
designed and persons who rely on this device for their safety could sustain serious personal injury or death.
Please read and observe the WARNINGS and CAUTIONS inside. For any additional information relative to
use or repair, call 1-800-MSA-2222 during regular working hours.

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AirHawk® II Air Mask
US
Contents
1 AirHawk II Second Stage Regulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Second Stage Regulator Replacement Kits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 FireHawk Air Mask Second Stage Regulator Overhaul Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Second Stage Regulator Overhaul Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 Height Gauge Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.5 Parts List and Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5.1 Non-CBRN Firehawk Second Stage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5.2 CBRN Firehawk Second Stage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2 General Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2.1 Releasing Pressure from the SCBA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Maintenance and Repair Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1.1 Removing the Regulator Cover and Spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1.2 Removing the Diaphragm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1.3 Disassembling the Bypass and Hose with Swivel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1.4 Removing the Valve Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.1.5 Disassembling the Regulator Housing Buttons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1.6 Removing the Seal Ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1.7 Valve Fork Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.2 Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.2.1 Installing the Regulator Seal Ring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.2.2 Installing the Regulator Housing and Buttons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.2.3 Installing the Valve Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.2.4 Installing the Bypass and Hose Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.2.5 Installing the Diaphragm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.2.6 Installing the Regulator Cover and Spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4AirHawk® II Air Mask
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4 G1 AirHawk II Regulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.1 Required Tools and Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.2 Replacement Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.2.1 Non-CBRN, Model Number 7-2991-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.2.2 CBRN, Model Number 7-2979-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.3 Overhaul Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.4 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5 Maintenance and Repair Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1 Regulator Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1.1 Removing the Regulator Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1.2 Installing the Regulator Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.2 Regulator Bypass and Hose Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.2.1 Removing the Regulator Bypass and Hose Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.2.2 Installing the Regulator Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.3 Regulator Spring and Spring Retainer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.3.1 Removing the Regulator Spring and Spring Retainer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 34
5.3.2 Installing the Regulator Spring and Spring Retainer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.4 Diaphragm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.4.1 Removing the Diaphragm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.4.2 Installing the Diaphragm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.5 Valve Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.5.1 Removing the Valve Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.5.2 Installing the Valve Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.6 Regulator Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.6.1 Removing the Regulator Buttons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.6.2 Installing the Regulator Buttons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.7 Regulator Seal Ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5.7.1 Removing the Regulator Seal Ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5.7.2 Installing the Regulator Seal Ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.8 Regulator Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.8.1 Removing the Regulator Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.8.2 Installing the Regulator Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

5
AirHawk II Second Stage Regulator
AirHawk® II Air Mask
US
1 AirHawk II Second Stage Regulator
1.1 Second Stage Regulator Replacement Kits
1.2 FireHawk Air Mask Second Stage Regulator Overhaul Kits
1.3 Second Stage Regulator Overhaul Kits
1.4 Height Gauge Kit
*(not required with Non-Purge Cover)
Description Item Part Number
Valve Assembly 10087295 10087305
Housing Assembly 10087301
Description Item Part Number
O-ring (2 required) 10023509
Non-CBRN
10030663
O-ring (2 required) 10037951
O-ring, Silicone, Red 697453
O-ring (2 required) 634669
O-ring 63198
Screen 10020784
O-ring (2 required) 10023509
CBRN
10048942
O-ring (2 required) 10037951
O-ring, Silicone, Red 697453
O-ring (2 required) 634669
O-ring 63198
Screen 10020784
Cap, Spring 10047528
Shield, CBRN 10044026
Description Item Part Number
Cap, string 10047528 10091435
Shield, CBRN 10044026
Seal ring (pack of 10) 10031192 10091436
O-ring (pack of 10) 10023509 10091437
O-ring (pack of 10) 10037951 10091438
Spring, button (pack of 10) 10018965 10091439
O-ring, silicone, red (pack of 10) 697453 10091440
O-ring (pack of 10) 634669 10091461
Description Item Part Number
Height gauge for P/N 10087295 10090457 10090458

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AirHawk II Second Stage Regulator
AirHawk® II Air Mask
US
1.5 Parts List and Exploded View
1.5.1 Non-CBRN Firehawk Second Stage Regulator
19
5
12
34
4
811
10
2
6
9
1
14
13
16
7
20
18
7
15
13
17
14
Christo-Lube
Christo-Lube
Christo-Lube
Christo-Lube
Christo-Lube
Christo-Lube
Christo-Lube

7
AirHawk II Second Stage Regulator
AirHawk® II Air Mask
US
Item Description Part number
1 O-ring, Silicone, Red 697453
2 O-ring, Fluro, Blue 634669
3 Diphragm, Silicone 10018540
4 U-clip 10018547
5 Retainer, Spring, Purge Cover ONLY 10018622
6 Knob, Bypass 10018774
7 Spring, Button 10018965
8 Body, Bypass 10018966
9 Insert, Bypass 10018971
10 Hose, Threaded 10020782
Hose, QC 10032940
11 Screen, Bypass 10020784
12 Spring, Diaphragm 10020931
13 O-ring, Viton, Black 10023509
14 O-ring, Buna-N, Black 10037951
15 Button, PTC 10024111
16 Button, STC 10024112
Button, PTC 10024111
17 Valve Assembly 10087295
18 Housing, Regulator 10087302
19 Cover, Purge 10026139
Cover, Non-Purge 10047406
20 Seal Ring 10031192
Christo-Lube Lubricant 604070

8
AirHawk II Second Stage Regulator
AirHawk® II Air Mask
US
1.5.2 CBRN Firehawk Second Stage Regulator
19
12
21
22
3 4 811
10
4
2
6
9
17
13
15
14
7
18
1
14
16
7
20
13
Christo-Lube
Christo-Lube
Christo-Lube
Christo-Lube
Christo-Lube
Christo-Lube
Christo-Lube
Christo-Lube
5

9
AirHawk II Second Stage Regulator
AirHawk® II Air Mask
US
Item Description Part number
1 O-ring, Silicone, Red 697453
2 O-ring, Fluro, Blue 634669
3 Diphragm, CBRN 10039172
4 U-clip 10018547
5 Retainer Spring (purge cover only) 10018622
6 Knob, Bypass 10018774
7 Spring, Button 10018965
8 Body, Bypass 10018966
9 Insert, Bypass 10018971
10 Hose, Threaded 10036171
Hose, QC 10046484
11 Screen, Bypass 10020784
12 Spring, Diaphragm 10020931
13 O-ring, Viton, Black 10023509
14 O-ring, Buna-N, Black 10037951
15 Button, PTC 10047238
16 Button, STC 10047331
Button, PTC 10047238
17 Valve Assembly 10087295
18 Housing, Regulator 10087301
19 Cover, Non-Purge 10047664
20 Seal Ring 10031192
21 Cap, Spring 10047528
22 Shield, CBRN 10044026
Christo-Lube Lubricant 604070

10
General Instructions
AirHawk® II Air Mask
US
2 General Instructions
WARNING!
Only certified C.A.R.E. technicians are approved to do the procedures in this manual.
Before starting any repair or maintenance procedure, make sure all pressure has been released from
the SCBA. Trying to disassemble a pressurized SCBA can cause parts to become airborne projectiles.
Failure to follow these warnings can result in serious personal injury or death.
CAUTION!
To prevent damage to the CBRN shield, touch only the rim.
2.1 Releasing Pressure from the SCBA
(1) Turn the handwheel clockwise to close the cylinder valve.
(2) Push the regulator release buttons.
(3) Turn the regulator bypass knob counterclockwise to open the regulator bypass valve and release pres-
sure from the SCBA.

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Maintenance and Repair Procedures
AirHawk® II Air Mask
US
3 Maintenance and Repair Procedures
3.1 Disassembly
3.1.1 Removing the Regulator Cover and Spring
3.1.2 Removing the Diaphragm
Remove the regulator cover.
(1) Press and hold the release buttons while pressing the regulator
housing retaining latches.
NOTE: Do not touch the cover while pressing the release buttons
and retaining latches. Let the spring act on the cover.
(2) Allow the cover to drop into your palm.
(3) Remove the spring, and spring retainer from the regulator
housing.
(4) Turn the spring clockwise to remove it from the retainer.
NOTE: Do not stretch the spring.
(1) CBRN only: Lift the CBRN shield off the diaphragm assembly.

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Maintenance and Repair Procedures
AirHawk® II Air Mask
US
3.1.3 Disassembling the Bypass and Hose with Swivel
(2) CBRN only: Lift the spring cap off the CBRN Shield.
(3) Roll the edge off the regulator housing.
(4) Slide the diaphragm away from the bypass handwheel off the
valve fork.
(1) Remove the regulator cover, spring, and spring retainer.
NOTE: It is not necessary to remove the diaphragm.
(2) Use a small, flat-blade screwdriver to remove the U-clip.

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Maintenance and Repair Procedures
AirHawk® II Air Mask
US
(3) Remove the bypass knob.
(4) Remove the bypass body U-clip.
(5) Remove the bypass and hose assembly by pulling the hose out of
the bypass body.
(6) Remove the hose assembly o-ring. Be careful not to scratch the o-
ring groove.
(7) Inspect the second groove of the hose swivel. Remove all dirt and
foreign matter before reassembling the bypass body.

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Maintenance and Repair Procedures
AirHawk® II Air Mask
US
3.1.4 Removing the Valve Assembly
(1) Remove the regulator cover, spring, and spring retain- er. (Refer to Section 3.1.1 "Removing the Regu-
lator Cover and Spring").
(2) Remove the diaphragm. (Refer to Section 3.1.2 "Removing the Diaphragm").
(3) Remove the U-clip from the regulator housing. (Refer to Section 3.1.3 "Disassembling the Bypass and
Hose with Swivel").
(4) Remove the bypass insert.
(8) Use the plastic stick or small flat blade screwdriver to push the
screen out of the bypass body.
(9) Inspect the bypass screen.
a)Replace the screen if damaged.
(10) Remove all dirt and foreign matter before reinstalling the screen.
(5) Use the bypass body as a tool to unscrew the bypass insert.
(6) Use the o-ring removal tool to remove the bypass insert.
(7) Lift the valve out of the regulator housing.

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Maintenance and Repair Procedures
AirHawk® II Air Mask
US
3.1.5 Disassembling the Regulator Housing Buttons
3.1.6 Removing the Seal Ring
(1) Remove the old O-rings. Be careful not to scratch the o-ring
groove.
(2) Discard the old O-ring.
(3) The spring will push the button from the housing.
Be careful not to lose the spring
(1) Use the o-ring removal tool to remove the seal ring.
(2) Discard the old seal ring.

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Maintenance and Repair Procedures
AirHawk® II Air Mask
US
3.1.7 Valve Fork Height
3.1.7.1 Inspection of the Valve Fork for Proper Height
Inspect and adjust valve fork height with the valve fork pointing toward you. The valve fork assembly must
move up and down freely.
(1) Press the top of the valve fork to check movement.
1 Adjustment Wheel
2Fork
3 Valve support
4 Valve locking tab
5 Valve housing
(2) Use the height gauge to verify the fork height setting.
(3) Center the gauge in the valve fork.
(4) Ensure that the valve assembly is vertical and can move
freely.
The top of the valve fork must be within the acceptable range.
Acceptable range

17
Maintenance and Repair Procedures
AirHawk® II Air Mask
US
3.1.7.2 Acceptable Valve Fork Heights
Normally the valve fork will not require adjustment.
Do not adjust the valve if the fork is within the acceptable range.
If the top of the valve fork is above or below the acceptable range, adjust the valve.
3.1.7.3 Adjusting Valve Fork Height
Adjustment of Valve Fork
Inspect and adjust valve fork height with the valve fork pointing toward you.
• Turn the Adjustment Wheel clockwise to lower the fork.
• Turn the adjustment wheel counterclockwise to raise the fork.
Valve Fork Above the Maximum
Above maximum height – Top of fork above top of acceptable range
(2) Turn the adjustment wheel clockwise to lower the fork.
Nominal height
Top of fork level with center of
acceptable range
Maximum Height
Top of fork level with top of
acceptable range
Minimum Height
Top of fork level with bottom of
acceptable range
(1) Slide the adjustment when and valve housing slightly away from
the valve support to allow the adjustment wheel to rotate.
The adjustment wheel cannot turn unless the
ribs are free from the locking tab.

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Maintenance and Repair Procedures
AirHawk® II Air Mask
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(3) Slide the adjustment wheel and valve housing back into place.
(4) Ensure that the valve lever and fork do not bind. The fork should move up and down easily.
Valve Fork Below the Minimum
Below minimum height – Top of fork is below accept- able range.
(2) Turn the adjustment wheel counterclockwise to raise the fork.
(3) Slide the valve housing back into place.
(4) Ensure that the valve lever and fork do not bind. The fork should move up and down easily.
3.2 Reassembly
3.2.1 Installing the Regulator Seal Ring
WARNING!
An unseated seal can cause an air leak.
Failure to follow this warning can result in serious injury or death.
(1) Slide the adjustment when and valve housing slightly away
from the valve support to allow the adjustment wheel to rotate.
The adjustment wheel cannot turn unless
the ribs are free from the locking tab.
(1) Apply a thin film of Christo-Lube lubricant to the new seal ring.
(2) Roll the new seal ring onto the regulator outlet and seat it into
the O-ring groove.

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Maintenance and Repair Procedures
AirHawk® II Air Mask
US
3.2.2 Installing the Regulator Housing and Buttons
(3) Install the springs.
(4) Align the buttons.
NOTE: With the bypass at 9:00 o’clock, the slide button is at 12:00 o’clock and the housing button is at 6:00
o’clock.
(5) Push firmly on the buttons.
(6) Double check proper engagement by pulling on the buttons.
(7) Reinstall the diaphragm.
(8) Reinstall the spring and regulator cover.
(9) Connect the second stage hose to the first stage intermediate pressure hose.
a)Use the foot-pound torque wrench and 3/4” crowfoot to tighten to 125 ±5 in lbs.
(10) Check Valve Fork Height. (Refer to Section 3.1.7.3 "Adjusting Valve Fork Height").
(11) Flow Test the Air Mask. (Refer to Introduction: AirHawk® II Air Mask Maintenance and Repair,
P/N 10104216 for Flow Test and Overhaul Requirements)
3.2.3 Installing the Valve Assembly
(1) Apply a thin film of Christo-Lube lubricant ) to the new O-rings.
(2) Install new o-rings on the button posts.
(1) Insert the valve into the regulator housing with the valve fork up
and facing away from the bypass port.
(2) Push the valve into the regulator housing.

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Maintenance and Repair Procedures
AirHawk® II Air Mask
US
3.2.4 Installing the Bypass and Hose Assembly
(3) Install a new o-ring.
a)Protect the o-ring with tape or a thin piece of paper.
b)Apply a small amount of Christo-Lube lubricant to the o-ring.
c)Slip the o-ring over the thread.
d)Remove the protective tape or paper.
(4) Reinstall the bypass insert into the bypass port with the slot
facing out.
(5) Use the bypass body to screw the bypass insert into the valve.
Hand tighten.
(6) Hand tighten.
NOTE: If the bypass insert does not screw into the valve assembly
easily, the valve assembly may not be properly aligned. Ensure that
the valve assembly is seated fully in the regulator housing.
(1) Install the bypass screen.
Be careful not to damage the screen.
NOTE: Make sure that the screen lays flat inside the body.