- Engine:
- G3512E (S/N: GHD1-UP)
- Generator Set:
- G3516 (S/N: GAS1-UP; GZZ1-UP)
- G3516C (S/N: GSB1-UP)
- G3520 (S/N: CWW1-UP; GZN1-UP; GZL1-UP; GZM1-UP; GZH1-UP)
- G3520C (S/N: CWY1-UP; GZJ1-UP; GZK1-UP)
- G3520E (S/N: GZG1-UP)
The mounting of the power distribution box and the routing of the wiring within the box has been improved. The improvements will extend the service life of the wiring and of the circuit breakers. The improvements will help to prevent the following conditions that are related to vibration:
- Abrasion of the insulation on the wiring within the box
- Damage to the posts for the wiring to the circuit breakers
- Damage to the internal parts of the circuit breakers
Those conditions can contribute to the following difficulties with operation:
- Unstable engine performance
- Interruption of communication between the engine electronic control module (ECM), the fuel metering valve, the actuator for the compressor bypass, and the throttle actuator
- Intermittent loss of power to the ECM
- Intermittent diagnostic codes for conditions such as engine overspeed and lack of communication between electronic components
- Unexpected engine shutdown
The new design now uses new brackets for shock mounting of the power distribution box. Refer to Illustration 1.
Refer to Table 1 for a list of parts for the improved mounting of the power distribution box.
Illustration 2 is an example of the current production routing of the wires within the power distribution box.
| Parts List for the Improved Mounting for the Power Distribution Box | ||
|---|---|---|
| Quantity | Part Number | Description |
| 1 | 309-1768 | Bracket As |
| 1 | 309-1767 | Bracket As |
| 1 | 146-1815 | Strap |
| 4 | 121-0816 | Flexible Mount |
| 8 | 6D-5801 | Locknut |
| 8 | 9X-8486 | Screw |
| 4 | 0S-1590 | Bolt |
| 4 | 1B-2713 | Bolt |
| 4 | 1A-5964 | Bolt |
| 2 | 1H-3338 | Lockwasher |
| 2 | 2A-0762 | Bolt |
| 4 | 5P-0537 | Hard Washer |
| 4 | 3B-4506 | Lockwasher |
| 4 | 5M-2894 | Hard Washer |
| 33 | 8L-8413 | Cable Strap |
 | |
| Illustration 1 | g01385481 |
Improved mounting for the power distribution box | |
 | |
| Illustration 2 | g01383012 |
Current production routing of the wires within the power distribution box | |
Inspect the circuit breakers within the power distribution box at the 2000 hour service interval. Inspect the terminals on the circuit breakers for wear and the overall condition of the internal wiring. Refer to Illustration 3
 | |
| Illustration 3 | g01394187 |
Circuit breaker (1) Terminal on a circuit breaker | |
The improvements to the mounting and wiring for the power distribution box is effective with the following serial numbers that are listed in Table 2
| Effective Serial Numbers |
| S/N:GZZ00247-UP |
| S/N:GSB00120-UP |
| S/N:GAS00216-UP |
| S/N:GZN00592-UP |
| S/N:GZH00124-UP |
| S/N:GZM00181-UP |
| S/N:GZL00141-UP |
| S/N:GZK00183-UP |
| S/N:GZJ00316-UP |
| S/N:GZH00124-UP |
| S/N:GZG00112-UP |
| S/N:GHD00152-UP |
| S/N:CWY00222-UP |
| S/N:CWW00302-UP |