1994/12/19 Caterpillar

Primary Pressure For The Transmission Pressure Control Group Has Been Increased {0374,3150}

Usage:

793 (3SJ),
793B (1HL) Trucks

SUPPLEMENT: APRIL 20, 1998

Service Magazine SEPD0237, Article 6, Page 15; "Primary Pressure For The Transmission Pressure Control Group Has Been Increased" for 793 and 793B Off-Highway Trucks.

Disregard this article and see Service Magazine SEPD0413, Article 14, Page 19 with similar title.

--------------- END SUPPLEMENT ---------------

The transmission clutch primary pressure for the No. 5 clutch (Station F) has been increased. The new pressure is 414 +35, -15 kPa (60 +7, -5 psi) with the engine at low idle. The former pressure setting was 313 kPa (45 psi).

By increasing the transmission primary pressure, less time will be needed to fill the No. 5 clutch which will allow clutch modulation to start sooner.

NOTE: This pressure increase applies only to the 8E-3840 Control Valve Group used in 793 and 793B Trucks.

Caterpillar Information System:

1994/12/19 New Screen Assembly Prevents Large Debris From Transferring Into Differential Compartment {4051,3258}

1994/12/19 Small Cracks Around The Holes In The Front Wheels Can Be Repaired By Welding {4201}

1994/12/19 New Roller Bearings Used In The 8E-9034 Transmission Planetary Group To Improve Service Life {3160}

1994/12/12 New Cylinder Blocks Made From Stronger Alloy{1201}

1994/12/12 New Exhaust Bypass Valve (Wastegate) Used In Exhaust Bypass Group{1057}

1994/12/12 Serviceable Parts For Custom Option Engine Prelube Group{1319}

1994/12/12 Injector Solenoids on Engines Equipped with EUI Are Not Polarity Sensitive{1259}

1994/12/12 Caterpillar Hose Press And Tool Usage{5057,0684}

1994/12/12 Procedure To Bleed And Charge The Rear Suspension{7213}

1994/12/12 Procedure For Measuring Oscillating Hitch Wear {7113,7114}

1994/12/05 Dry Start Priming Procedure for 3500 Machine Engines with Electronic Unit Injection (EUI){1250,1258}

1994/12/05 Flexible Hose Assembly Replaces Tube Assemblies In Turbocharger Water Lines Groups{1380}

1994/12/19 New Filter Used For Screed Burner And Washdown Systems {1274,5642}

1994/12/19 Spacer Plate Is Available To Make Installation Of Permanent Hose Couplings Easier {0684,5057}

1994/12/19 Special Instruction SEHS9734-01 Is Available For Retrofitting R-12 Air Conditioning Systems To R-134a Refrigerant {7320,1809}

1994/12/19 New Connecting Rod Assembly Has Increased Fatigue Strength {1218}

1994/12/19 New Water And Oil Temperature Regulators Available {1330,1355}

1994/12/19 New Electronic Control Group (Throttle Position Sensor) Has Improved Contact Design {1913}

1994/12/26 New Engine Oil Pressure Gauge And Sender {7455}

1994/12/26 New Bearing Housing Used In Turbocharger Group {1056,1052}

1994/12/26 Information Release Memo PELE0401 Has Information About Remanufactured Hydraulic Piston Pump And Piston Motor Groups {0374,4134,4136,4351,5058,5070,5080,5314,5315,5473}

1994/12/26 New Oil Tube Clamp Assembly Is More Durable and More Resistant to Leakage {1307}

1995/01/16 Special Instruction SEHS9429-01 Available for Spherical Bearings for Bulldozers and Rippers{7551,6050,6313}

1995/01/16 Fuel Injection Pump Change{1251}