Hexagon MT-45 Service Manual

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Diagnostic Service Manual

Freightliner Custom Chassis Corporation (FCCC) MT

DSM.0008 Ver 1.0

February 24, 2022

February 15, 2022

CNG Fuel Systems

FCCC Model

MT-45

MT-55

RINTED AND

OWNLOADED

FCCC MT-45 / MT 55 CNG Diagnostics Service Manual

RINTED AND

OWNLOADED

OPIES ARE

Wheelbase

168-in

178-in

208-in

OPIES ARE

ONTROLLED

FCCC MT CNG

DSM.0008 Ver. 1.0

February 24, 2022

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Summary of Contents for Hexagon MT-45

Page 1 RINTED AND OWNLOADED OPIES ARE ONTROLLED DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND RINTED AND...
Page 2: Preface
Chassis Corporation (FCCC). ® 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.
Page 3: Table Of Contents
® Hexagon Agility Customer Care and Technical Service DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 4: Acronyms
DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 5: Safety
Characteristic or Significant Characteristic or maintaining material identification/ traceability. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 6: Qualified Personnel
8. Wear appropriate attire and PPE while servicing or maintaining any CNG system. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022...
Page 7: General Safety Precautions
OFF/CLOSED” position. To consume residual CNG forward of the 1/4-turn manual shutoff valve run the engine until it stalls. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 8: Vehicle Fire Procedure
DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 9: Fuel System Schematic
*part of pressure regulator assembly †located on HP fuel filter DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 10 PRD vent tubes *part of PRD vent outlet assembly DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 11: Fuel System Troubleshooting And Diagnostics
CNG storage systems; however, conditions concerning other onboard systems may influence or directly cause problems with the CNG storage system. ® For any faults not addressed in this manual or for warranty information please contact Hexagon Agility Customer Care and Technical Services: 833-4-HEX-CARE, toll-free in the U.S.
Page 12 • Mechanical engine failures • Engine sensor fault DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 13: Electrical
IO30 Crank Request connector located behind instrument cluster. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 14 F79 Connector OEM Fuel Send and Return Harness DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 15: Connector Pin-Out
Circuit Color Description Start Relay Confirm DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND RINTED AND...
Page 16 Description Supply Solenoid B+ Supply Solenoid Ground DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND RINTED AND...
Page 17 Fuel Gauge Low Reference PK/WT ECU Power DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND RINTED AND...
Page 18: Fuel Gauge Non-Operation
The following diagnostic steps are designed to systematically identify the root cause(s) of non-operation fuel gauge condition and point to corresponding repair procedures. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 19 • Intermittent or poor connection. • Damaged pressure transducer. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 20 Install proper lockout/tagout (LOTO) device and observe all LOTO practices. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 21 If no fault code sets, system is functioning to design intent. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 22 F79 connector OEM fuel send and return harness. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 23 Splice 4, located inside harness near grommet on firewall within engine compartment. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 24 Brown Signal Fuel System Control Module DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND RINTED AND...
Page 25 ECM (driver footwell) C1 connector C2 connector DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND RINTED AND...
Page 26 Pressure regulator (driver side frame rail) pressure regulator P31 connector DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 27  Proceed to Step 5.  Proceed to Step 19. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 28  Proceed to Step 18.  Proceed to Step 9. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 29 F78 and C1 connectors. Refer to DSM.0036.  Perform System Verification Procedure. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 30  Proceed to Step 10.  Proceed to Step 11. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 31  Perform System Verification Procedure.  Perform System Verification Procedure. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 32 C1 and Splice 1. Refer to DSM.0036.  Perform System Verification Procedure. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 33  Perform System Verification Procedure. DSM.0036.  Perform System Verification Procedure. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 34  Replace ECM.  Perform System Verification Procedure. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 35  Follow FCCC diagnostic procedure.  Perform System Verification Procedure. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 36: Crank, No-Start
The following diagnostic steps are designed to systematically identify the root cause(s) of the Crank, No Start condition and point to corresponding repair procedures. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 37 Install proper lockout/tagout (LOTO) device and observe all LOTO practices. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 38 Y41 Supply Solenoid Valve connector Located on pressure regulator. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 39 Fuel Control Module Gauge Signal DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND RINTED AND OWNLOADED...
Page 40  Proceed to Step 4.  Engine won’t start, proceed to Step 4. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 41  Proceed to Step 9.  Proceed to Step 7. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 42  Perform System Verification Procedure.  Perform System Verification Procedure. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 43 Test tool installed:  Proceed to Step 12. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 44  Complete leak check procedure.  Perform System Verification Procedure. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 45 Proceed to instructions. Proceed to Step 16. Step 16. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 46  Complete Leak Check Procedure DSM.0037 at all fittings and connections involved in this procedure.  Perform System Verification Procedure. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 47: No-Crank, No-Start
The following diagnostic steps are designed to systematically identify the root cause(s) of lack of power and direct to corresponding repair procedures. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 48 Install proper lockout/tagout (LOTO) device and observe all LOTO practices. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 49 D81 DAP (Drive Away Protection) located on bottom of fill panel. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 50 F79 Connector OEM Fuel Send and Return Harness DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 51 Green Green Fuel System Control Module DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND RINTED AND...
Page 52 Splice 4, located inside harness near grommet on firewall within engine compartment. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 53 IO31 start confirm C2 connector OEM internal fuse boxes DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 54  Replace affected component, retry crank.  Proceed to Step 4. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 55 C1 and IO30 Connectors. Refer to DSM.0036.  Perform System Verification Procedure. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 56  Proceed to Step 8.  Proceed to Step 8. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 57  Proceed to Step 12.  Proceed to Step 10. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 58  Proceed to Step 13.  Perform System Verification Procedure. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 59  Perform System Verification Procedure.  Perform System Verification Process. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 60: Engine Misfire Diagnostics
FCCC MT CNG Engine Misfire Diagnostics Engine Misfire Diagnostics DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 61 Possible Faults 1322 • Fuel injector malfunction DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND RINTED AND...
Page 62 Install proper lockout/tagout (LOTO) device and observe all LOTO practices. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 63  Perform System Verification Procedure. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 64 LP fuel line disconnected:  Proceed to Step 9. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 65 Depressurization complete:  Proceed to Step 13. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 66  Proceed to Step 15.  Proceed to Step 15. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 67  Complete Leak Check Procedure DSM.0037 at all fittings and connections involved in this procedure.  Perform System Verification Procedure. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 68  Complete Leak Check Procedure DSM.0037 at all fittings and connections involved in this procedure.  Perform System Verification Procedure. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 69: Fuel System Depressurization
Depressurization is required whenever fuel delivery system plumbing and components are repaired or replaced. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022...
Page 70 Install proper lockout/tagout (LOTO) device and observe all LOTO practices. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 71 FRONT passenger side manual shutoff valve DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND RINTED AND...
Page 72 FRONT HP fuel gauge fuel fill panel DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND RINTED AND...
Page 73 Complete service and repairs as needed. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 74 4. Always perform leak check procedures. 5. Before operating vehicle, Perform System Verification Procedures. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 75: Defueling
Defueling is required to repair or replace fuel storage system plumbing and components. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022...
Page 76 Install proper lockout/tagout (LOTO) device and observe all LOTO practices. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 77 FRONT bleed valve HP fuel filter DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND RINTED AND...
Page 78 DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND RINTED AND...
Page 79 DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 80 FRONT 1/4-turn manual shut off valve DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND RINTED AND...
Page 81 FRONT HP fuel gauge fuel fill panel DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND RINTED AND...
Page 82 Step 15 defuel hose fitting defuel adapter hose DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 83 (a) O-ring. bleed valve O-ring bleed valve DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 84 Leak check procedure DSM.0037 must be performed before vehicle may be cleared for operation. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 85: Filter Element Replacement
FCCC MT CNG Filter Element Replacement DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND RINTED AND...
Page 86 ® Hexagon Agility has established the following maintenance intervals to ensure safe and reliable engine fuel system operation. For questions regarding engine and fuel system service and maintenance please refer to the Hexagon ® Agility website for the latest contact information.
Page 87 (4), (7) and O-ring lube POA = Part of Assembly DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 88 POA = Part of Assembly * Fitting configurations may vary DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 89  Remove filter element from filter assembly. Step 3 FRONT DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 90 Step 7  Lube O-ring with lubricant (not shown). DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 91 DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND RINTED AND OWNLOADED...
Page 92 Step 14 Depressurization section.  Proceed to Step 15. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 93  Repair, replace or tighten all fittings which indicated leaks. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 94  Replace filter assembly or components as needed. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 95: System Verification
6. If fault is not cleared, Contact Hexagon Agility Technical Support for further diagnostic assistance. DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022...
Page 96: Removal And Retightening Of Tube Fittings (Appendix A. Wi.0199)
FCCC MT CNG Removal and Retightening of Tube Fittings DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 97 FCCC MT CNG Removal and Retightening of Tube Fittings DSM.0008 Ver 1.0 DSM.0008 Ver 1.0 FCCC MT-45 / MT 55 CNG Diagnostics Service Manual FCCC MT-45 / MT 55 CNG Diagnostics Service Manual February 15, 2022 February 24, 2022 RINTED AND...
Page 98: Hexagon Agility ® Customer Care And Technical Service
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 ®...

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