2001/10/15 Caterpillar

Pipelayer:

572R (S/N: 2HZ1-UP; AAC1-UP)

Track-Type Tractor:

D10R (S/N: AKT1-UP)

D5M (S/N: 3CR1-UP; 5ES1-UP; 6AS1-UP; 6GN1-UP; 7LR1-UP)

D5N (S/N: AGG1-UP; AKD1-UP)

D6M (S/N: 3WN1-UP; 4HS1-UP; 4JN1-UP; 5NR1-UP; 6LR1-UP)

D6N (S/N: AKM1-UP; ALH1-UP; ALR1-UP; ALY1-UP; CBJ1-UP; CCG1-UP; CCK1-UP)

D6R (S/N: 1RW1-UP; 2HM1-UP; 2YN1-UP; 3ZN1-UP; 4FM1-UP; 4HN1-UP; 4JR1-UP; 4MN1-UP; 4TR1-UP; 4WR1-UP; 5LN1-UP; 5PR1-UP; 5RR1-UP; 6FR1-UP; 6GR1-UP; 6HR1-UP; 6JN1-UP; 6MR1-UP; 7AR1-UP; 7DR1-UP; 7GR1-UP; 7KN1-UP; 8LN1-UP; 8TM1-UP; 8XN1-UP; 9BM1-UP; 9MN1-UP; 9PN1-UP; 9ZS1-UP; AAX1-UP; ADE1-UP; ACJ1-UP; AEP1-UP; AEM1-UP; AFM1-UP; AGM1-UP; BLT1-UP; BMY1-UP; BNC1-UP; DMP1-UP)

D7R (S/N: 2EN1-UP; 2HR1-UP; 3DN1-UP; 3ZR1-UP; 4SR1-UP; 5KZ1-UP; 5MR1-UP; 6ER1-UP; 9HM1-UP; ABJ1-UP; ACS1-UP; ADW1-UP; AEC1-UP; AFG1-UP; AGN1-UP; CBZ1-UP)

D8R (S/N: AKA1-UP)

Description of Change: A new solenoid valve is used on the priority valve of track-type tractors. This new solenoid has been improved in the following ways:

• improved response time

• smoother shifting

• better reliability

Adaptable To: The 198-4607 Solenoid Valve Gp is a direct replacement for the 136-1679 Solenoid Valve Gp .

Dealer Parts Stock

On the track-type tractors that are listed above, the 198-4607 Solenoid Valve Gp should be used to replace any 136-1679 Solenoid Valve Gp. Any 136-1679 Solenoid Valve Gp that remain in dealer stock should be exhausted through use on applications that still require the 136-1679 Solenoid Valve Gp .