Operation and maintenance manual

QSB4.5 and QSB6.7 General Repair Instructions
Section i - Introduction Page i-9
• Perform the inspections specified in the procedures
• Replace all components or assemblies which are damaged or worn beyond the specifications
• Use genuine Cummins new or ReCon® service parts and assemblies
- The assembly instructions have been written to use again as many components and assemblies as possible.
When it is necessary to replace a component or assembly, the procedure is based on the use of new Cummins or
Cummins ReCon® components. All of the repair services described in this manual are available from all Cummins
Distributors and most Dealer locations.
• Follow the specified disassembly and assembly procedures to reduce the possibility of damage to the components
Complete rebuild instructions are available in the service manual which can be ordered or purchased from a Cummins
Authorized Repair Location. Refer to Section L — Service Literature for ordering instructions.
Welding on a Vehicle with an Electronic Controlled Fuel System
CAUTION
Disconnect both the positive (+) and negative (-) battery cables from the low voltage battery before welding on
the vehicle. Attach the welder ground cable no more than 0.61 meters [2 feet] from the part being welded. Do
not connect the ground clamp of the welder to any of the sensors, wiring harness, electronic control units or
the components. Direct welding of any electronic components must not be attempted. Sensors, wiring
harness, and electronic control unit should be removed if nearby welding will expose these components to
temperatures beyond normal operation. Additionally, all electronic control unit connectors must be
disconnected