5

2

3

FIGURE 5: Left cylinder valve plumbing after installation of left PRD vent tube assembly and live PRD tube
1 left live PRD tube, p/n 20437408
shaded left PRD vent tube assembly
4 tube clamp
2 male adapter fitting, p/n 10200236
3 male connector fitting, p/n 10240625
5 left valve
6 structure

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10. Install (1) live PRD tube, p/n 20437408, from retrofit kit on (5) left valve. FIGURE 5

Tighten nut fittings per Appendix A: WI.0441 Tightening of Tube Fittings.
11. Use 7/16-in socket and a 7/16-in wrench to secure (shaded) left PRD vent tube assembly to (6) structure
using (4) tube clamp and fasteners. FIGURE 5

Tighten tube clamp fasteners to 8 ft-lbs (10.85 Nm) and mark bolts with Torque Seal.
12. Use a pair of 11/16-in wrenches to remove (3) right PRD vent tube nut fitting from (5) right PRD. FIGURE 6

6

8

3

4

5
2

6

7

1
2

5

4

8

3

1

FIGURE 6. Right fuel system valve end plumbing components
1 right cylinder valve
4 live PRD tube
2 cylinder
5 right PRD
3 right PRD vent tube
6 tube clamp

7 structure
8 right manifold

13. Remove (4) live PRD tube from (1) right cylinder valve and (8) right manifold. FIGURE 6
14. Remove (3) right PRD vent tube from (5) right PRD. FIGURE 6
15. Use a pair of wrenches to remove fasteners securing (6) tube clamp and (3) right PRD vent tube to (7)
structure and set fasteners and clamp aside for reuse. FIGURE 6
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Reuse, recycle, or discard tube assemblies removed according to
authority having jurisdiction (AHJ) and/or organizational guidelines.
16. Remove (5) right PRD from (1) right cylinder valve. FIGURE 6

Reuse, recycle, or discard PRDs according AHJ and/or organizational
guidelines.
17. Install (2) male adapter fitting, p/n 10200236, from retrofit kit on (5) right cylinder valve. FIGURE 7

Torque male adapter fitting to 26 ft-lbs (35.3 Nm).

4
1
6

5

3

FIGURE 7. Right PRD vent tube assembly and male adapter fitting
1 right PRD vent tube assembly
3 male connector fitting, p/n 10200063
2 male adapter fitting, p/n 10200236
4 live PRD tube, p/n 20437408

2

5 right cylinder valve
6 right manifold

18. Use a 11/16-in wrench to install male connector fitting, p/n 10200063, of (1) right PRD vent tube assembly
while using a 5/8-in wrench to hold (2) male tube adapter, p/n 10200236. FIGURE 7 and FIGURE 8

Tighten connector fitting nut per Appendix A: WI.0441 Tightening of Tube Fittings.

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7

1
3

4

5

2

7
4
2

1

5

6

3

FIGURE 8: Right cylinder valve plumbing after installation of left PRD vent tube assembly and live PRD tube
1 right live PRD tube, p/n 20437408
shaded right PRD vent tube assembly
6 right manifold
2 male adapter fitting, p/n 10200236
4 tube clamp
7 structure
3 male connector fitting, p/n 10200063
5 right cylinder valve

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19. Install (1) live PRD tube, p/n 20437408, from retrofit kit on (5) right cylinder valve and (6) right manifold.
FIGURE 7 and FIGURE 8

Tighten nut fittings per Appendix A: WI.0441 Tightening of Tube Fittings.
20. Use a 7/16-in socket and 7/16-in wrench to secure (shaded) right PRD vent tube assembly to (7) structure
using (4) tube clamp and fasteners. FIGURE 8

Tighten tube clamp fasteners to 8 ft-lbs (10.85 Nm) and mark bolts with Torque Seal.
21. Perform Leak Test Procedure.

Leak Test Procedure

1. Fuel vehicle to 500 psi (3.45 MPa). Refer to ENP-516, Truck and Tractor CNG Fuel System Operation,
Maintenance & Inspection Manual, “CNG System Fueling” section.
2. Listen for hissing as a sign of a system leak.
3. Spray all fuel system connections with Swagelok® Snoop® leak detection solution and wait 10 minutes.
4. Inspect all fuel system junctions for bubbles as an indicator of a leak.
a. If no leaks are found, proceed to Step 5.
b. If a leak is found, depressurize fuel system. Refer to ENP-516, Truck and Tractor CNG Fuel System
Operation, Maintenance & Inspection Manual, “Depressurizing CNG Systems” section.

NEVER attempt to tighten fittings while system is pressurized.
c.

5.
6.
7.
8.

Repair leak(s). Refer to ENP-516, Truck and Tractor CNG Fuel System Operation, Maintenance &
Inspection Manual, “Leak Repair” section.
Fuel vehicle to 3600 psi (24.6 MPa).
Repeat Steps 2 through 4 until no leaks are present.
When the system passes the leak test, use shop rags to clean all Swagelok® Snoop® from fuel system
components.
Use a Torque Seal marker to mark properly tightened fuel system fittings. FIGURE 9

1

1

1

1

FIGURE 9. New fitting junctions marked with (1) Torque Seal. NOTE: right retrofit plumbing shown; left mirrors.

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Finish Installation
1. Use a battery-powered impact wrench and 7/32-in hex bit to reinstall valve end panel using stainless steel
fasteners. FIGURE 10

2

4

1
3

FIGURE 10. RM fuel system cover components
1 cover
2 doors

3 valve end panel
4 PRD vent tube caps

circled vent opening

Verify: 1) PRD vent tube caps do not touch valve end cover vent openings, and 2)
vent cap tips are flush with the underside of the cover OR do not protrude more
than 0.5-in (12.7 mm) above the cover. FIGURE 10
2. Close doors and use a battery-powered impact wrench and a 7/32-in hex bit to reinstall stainless steel
fasteners. FIGURE 10
3. Road test vehicle using the procedure described below.

Road Test Procedure

1.
2.
3.
4.
5.
6.

Remove wheel chocks from tires.
Start engine and verify proper fuel system operation.
Road test the vehicle until it reaches operating temperature.
If a fuel system fault appears, contact Hexagon Agility® CCTS.
If the system is operating properly, release vehicle into service.
Update vehicle maintenance and repair records.

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Appendix A: WI.0441 Tightening of Tube Fittings

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Hexagon Agility® Customer Care and Technical Services

Fuel system warranty or non-warranty product support may be obtained by calling or emailing Hexagon Agility®
Customer Care and Technical Services (CCTS). Please provide your name, phone number, email address, and
complete vehicle information: VIN, year, make, model, mileage, unit number vehicle owner, and current vehicle
location. A service advisor will contact you to arrange vehicle repair or ship a part.

+1 855 500 2445

(toll-free, U.S. and Canada)

+1 949 267 7745

Support

[email protected]
Parts Orders

[email protected]

Proprietary Statement

The information provided within this document is proprietary and confidential. All prior versions, including updates and revisions forwarded
separately, are proprietary. The information provided by Hexagon Agility® to its customers and clients is solely for the use of those customers and
clients. No portion of this publication may be reproduced or distributed without express written consent of Hexagon Agility®. Hexagon Agility® reserves
the right to utilize the intellectual property contained within this publication as content for any other publication produced by Hexagon Agility ®.

Trademark Notice

Hexagon® is a registered trademark of Hexagon Technology AS. Agility® is a registered trademark of Agility Fuel Solutions LLC. Trademarks of other
manufacturers are the property of their respective companies.

Hexagon Agility® 3335 Susan Street, Suite 100 Costa Mesa, CA 92626 USA

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www.hexagonagility.com

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