1990/12/17 Caterpillar

New Rotor Used In BrakeSaver Group; Regulator Valve Improved{1155}

Usage:

3406B Truck Engines

Description of Change: A new rotor is used in the BrakeSaver group. The new rotor has twice as many paddles which reduces the dynamic pressure fluctuations in the brakesaver and minimizes the tendency of fluid cavitation and housing/stator erosion.

The regulator valve has been improved to include a tamper indicating seal. A broken seal may indicate the air pressure settings are not factory specifications. Also, the 8T2822 Temperature Recorder Group) may be used on the oil filter to verify that the oil temperature to the engine does not exceed 116°C (240°F).

Adaptable To: The new 9N6574 Rotor is a direct replacement for the former 9N6573 Rotor (canceled). The new rotor is effective with 3406B (4MG91435, 8TC12886, 5YG382) Truck Engines. The part number of the improved 9L5570 Regulator Valve did not changed.

NOTE: Eroded housings can normally be reused.

Caterpillar Information System:

1990/12/17 New Bronze Thrust Plate Used On Center Main Bearing Of Crankshaft Groups{1203}

1990/12/17 Remanufactured Camshafts And Cam Kits Available For Parts Service{1210,1211,1212}

1990/12/17 Use The Marketing Publications Information Feedback Systems{0374}

1990/12/10 New Engine Magnetic Speed Sensor Used{1907}

1990/12/10 Tools Available For Out-Of-Chassis Dynamometer Testing Of Electronic Engines{0781,1901,1913}

1990/12/10 New Rear Power Takeoff Clutch Plates Do Not Contain Asbestos{3055,3404}

1990/12/10 New 7E5085 Bushing Replaces Former 2M4314 Bushing In Fuel Injection Pump Groups{1251}

1990/12/10 Correct Handling And Replacement of 3T6962 Pressure Switch Assembly{7332}

1990/12/10 Correct Handling And Installation Of Temperature Switch Assemblies{1906}

1990/12/10 Improved 9W1077 Start Switch Assembly And 7N4160 Heat Start Switch Group{1416}

1990/12/10 New Caterpillar Warranty Statement For Ground Engaging Tools, SELF5138{6800}

1990/11/26 New Expansion Tank Used{1354}

1990/12/17 Personality Module Software Updated; Do Not Troubleshoot Diagnostic Code 55 (No Detected Faults){1901,1902}

1990/12/17 New Ether Starting Aid Groups Available{1456}

1990/12/24 Sealed Alternators Available For Earthmoving Applications{1405}

1990/12/24 Incorrect Specification For Tightening Turbocharger Compressor Nut In Service Manual For 3306B Diesel Truck Engine, SEBR0545-01{1052}

1990/12/24 Installation Of Zinc Rods In Caterpillar Marine Engines{1350,1388}

1990/12/24 Air Pressure Settings For Pneumatic Selector Control Valve On Reintjes® Marine Transmissions{3313}

1990/12/24 Update Information For Exhaust Manifolds{1059}

1990/12/24 New 3E0020 Vehicle Speed Buffer Used{1914,1900}

1990/12/24 New Seals Available For Parts Service Of Noncurrent Water Lines Group{1380,1155,1378}

1990/12/24 Oversized Intake And Exhaust Valve Seat Inserts Available For Spark-Ignited Engine Heads{1103}

1990/12/24 Auxiliary Oil Filter Groups Used To Increase Oil Capacity And Extend Oil Change Interval To 750 Hours{1318,7534}

1990/12/24 New Tube And Bracket Provide Clearance For Alternator{1380,1405}