GASKET 5C1796 - Caterpillar

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 breakersThose 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 shutdownThe 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.
Table 1
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 boxInspect 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 breakerThe improvements to the mounting and wiring for the power distribution box is effective with the following serial numbers that are listed in Table 2
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