1979/04/09 Caterpillar

Separate Scraper Batteries And Electronic Transmission Controls Now Used{1400,3168}

Usage:

627B, 627B (PP) Tractor-Scrapers

Description of Change: The tractor and scraper electrical systems and other components of 627B and 627B (PP) Tractor-Scrapers are changed to use separate batteries on the scrapers, and electronic controls for the transmission. Both of these improvements will be put in effect at the same time.

With separate batteries for the scraper, the long battery cables from the tractor, over the gooseneck to the scraper engine are no longer needed. This will improve the electrical circuit for the starter on the scraper engine, and make it easier to start the engine.

The electronic controls for the transmission use a lower voltage and lower current flow in the control circuits. This lowers the electrical loads on circuit components for longer service life.

Adaptable To: Because of the large number of parts and high cost, conversion of earlier machines is not practical.

Caterpillar Information System:

1979/04/09 New Exhaust Valve Has Improved Three-Piece Construction{1105}

1979/04/09 Improved Engine Design Uses Cylinder Block With Spacer Plate{1000}

1979/04/09 New Brake Actuators And Improved Air System Give Better Brake Operation{4250}

1979/04/09 Serial Numbers Used Instead Of Test Numbers On Power Shift Transmissions{3150,7557}

1979/04/09 Stronger Components Used In Cushion Hitch Group{7107}

1979/04/09 New Shaft Assembly And Bearing Housing For Right End Of Elevator Upper Shaft Prevent Bearing Damage During Assembly{6234,6210}

1979/04/09 Ground Wire Added To Coolant Flow Switch{7450,1408}

1979/04/09 6V112 Repair Kit Available For Parts Service Of The 8H8558 Nut Spinner{0611}

1979/04/02 Stronger Output Shaft Now Used In 2N3909 Tachometer Drive Adapter{7462}

1979/04/02 Improved Fuel Priming Pumps Give Longer Service Life{1258}

1979/04/02 Reinforcement Plate Can Increase Service Life Of Push Frame{6225}

1979/04/02 Change Made To Power Train Oil Lines Group To Prevent Damage To Suction Hose{3154,3179,3004}

1979/04/09 New Fan Motors Used In Cab Pressurizers{7311}

1979/04/16 Testing And Adjusting Procedure For 5P4210 Modular Cab Tilting Cylinder And Valve{0620}

1979/04/16 Clean The Orifice In The Pressure Control Group During A Transmission Overhaul{3167}

1979/04/16 Hydraulic Accumulator Now Used In Lines Group For Draft Frame{5077,5057,5314,5055}

1979/04/16 How To Extend The Service Life Of 1P5550 Fuel Cam Locking Tool Assembly{0654,1250}

1979/04/16 Longer Self-Locking Bolts Now Used To Hold The Parking Brake Group To The Bearing Retainer{3161,3275,4267}

1979/04/16 90° Elbows On Quick Disconnect Couplers Make Installation Easier{0690}

1979/04/16 New Flywheel Clutch Uses Three Driven Discs Instead Of Two; Must Be Used Only With New Flywheel{3052,3054,1156}

1979/04/16 Different Type Brake Lining In Steering Brake Group; Higher Oil Level Used With New Lining{4110,3004}

1979/04/23 Two Bolts Have Been Added At The Junction Of The Converter And Retarder Housing To Prevent O-Ring Seal Damage{3109}

1979/04/23 New Retainer Used Between Bolt And Gear In The Torque Converter{3101}

1979/04/23 Dampeners Added To Steering Brake Group To Prevent Noise From Vibration Of Brake Band Assembly{4110}