1990/08/06 Caterpillar


New Rotary Solenoid (Brushless Torque Motor) Used In PEEC Engines{1909}

Usage:


3406B (5YG, 8TC ) Truck Engines

Description of Change: A new rotary solenoid (brushless torque motor) is used in the track position in these PEEC engines. The pin on the new solenoid has an improved design which provides additional pin relief. The new design will decrease instability at idle caused by the binding between the solenoid pin and the rack control sleeve. See the illustrations.

Adaptable To: The new 9X6770 Rotary Solenoid is a direct replacement for the former 6T1789 Solenoid (canceled). This change is effective with 3406B (8TC13193, 5YG386) Truck Engines and is adaptable to first production.


Illustration 1. Front view of 9X6770 Rotary Solenoid. Location of new pin.


Illustration 2. (A) Former pin design. (B) New pin design.

Caterpillar Information System:

1990/08/06 Coolant Loss In 3406B Truck Engines{1395,1355,1100,1124,1353,1216}
1990/07/30 New Throttle Shaft Bearing Sleeves Used In Governor Housing Assembly{1365}
1990/07/30 New Pistons Used{1225,1214}
1990/07/23 Bearing Information For SR 4 Generators{4471}
1990/07/23 Improvements Reduce Vibration To The Low Water Level Switch On Expansion Tanks{7422,1354}
1990/07/23 Improved Turbocharger Bearing Kit Available For Parts Service{1053}
1990/07/23 Powdered Metal Valve Guides Provide Increased Service Life{1104}
1990/07/23 Dimensions For Aluminum Washer{1221}
1990/07/23 Troubleshooting Forward Warning Horns That Will Not Work{7402}
1990/07/09 Solenoid Contacts May Corrode In 3T2648 Marine Starting Motor Group{1467,1453}
1990/07/09 New Seat Belt Group Increases Operator Comfort{7327,7312}
1990/07/02 What's Your Answer? {0113,5050}
1990/08/06 Rotor Shaft Length Changed{4457,4472}
1990/08/06 New Caterpillar Parts Identification Label{7567}
1990/08/13 Spacer Available To Eliminate Cracks On Ignition Coil Mounting Bracket{1554}
1990/08/13 Effective Dates, Serial Numbers And Features OF PEEC Personality Modules{1900,1902}
1990/08/13 Changes To Exhaust Manifold Expansion Sleeves And Bolts{1059}
1990/08/13 Stronger Fan Guard Resists Vibration Damage{1360}
1990/08/20 New Aftercooler Gaskets Help Maintain Constant Bolt Torque {1063,1079}
1990/08/20 Improvements To Reduce Black Exhaust Smoke {1088,1052,1065,1264,1278,1290,7525}
1990/08/20 Injector Timing Standardized {1272,1290}
1990/08/20 New Manifolds And Bellows Assemblies Used In Exhaust Manifold Group {1059}
1990/09/03 New Latching Fuel Solenoid Assemblies{1259}
1990/09/03 New Service Tools Available{0600,0700}
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