1990/02/05 Caterpillar

New Hardware Improves Hydraulic And Transmission Tank Group {5056,3177}

Usage:

785, 789 Trucks

Reference: Service Magazine; November 20, 1989; Page 10; "New Bolt And Locknut Used To Hold Baffle Tube Assembly In Hydraulic And Transmission Tank," for 785, 789 Trucks.

Description of Change: New hardware has improved the transmission and hydraulic tank group. The covers on the tank have a new self-locking bolt to prevent loosening of the bolt which could allow the tank to leak. The three sight glass bolts and the bolt next to the drains are the new self-locking bolts also.

Adaptable To: The part number of the improved 4T4147 Hydraulic And Transmission Tank Group has not changed. The new 308535 Bolt (1), for the covers, is a direct replacement for the former OL1351 Bolt. The new 5D0353 Bolt (2), for the sight glasses and drains, is a direct replacement for the former OS1594 Bolt. The new bolts should be installed on earlier trucks whenever the hydraulic tank is opened for service.

Illustration 1. Outer side of hydraulic tank.

Illustration 2. Inner side of hydraulic tank.

Caterpillar Information System:

1990/02/05 Check Differential Pinion Bearing Retainer Bolts Whenever Transmission Is Removed {3254,3269}

1990/02/05 Steel Wear Strips Can Be Modified To Make Them Adjustable {6151}

1990/02/05 New Wider Mobil-trac System (MTS) Belt Available {4198}

1990/02/05 New Bevel And Transfer Gear Groups With Higher Capacity Bearing Used In Transmission Arrangements {3257,3256}

1990/02/05 Installation Procedure For Asbestos-Free Brake Linings {4110}

1990/01/29 New Seal Used In Governor Fastener Group{1264}

1990/01/29 Special Application Rotor Blade Tool Available{6821}

1990/01/29 New Rotor Arrangement Using Quick Change Tool System Is Available{6636}

1990/01/29 New Smooth Endless Conveyor Belt Used{6621}

1990/01/29 Improved Hub And New Bolt Used In Hydraulic Pump Coupling Group{5062}

1990/01/29 New Torque Converter Assembly Used In Transmission Arrangement{3101}

1990/01/29 Procedure To Modify Single Piece Suspension Support To Accept Bolt-on Spindles{7216}

1990/02/05 New Hose Clamps Have Constant Torque {5057,7554}

1990/02/05 Serviceable Parts Now Available For Cutter Clutch {5606}

1990/02/12 Seals Can Be Added To Suspension Cylinder Bearings{7213}

1990/02/12 Invert A-Frame Mounting Bolts To Obtain Correct Torque{3268,7200}

1990/02/12 Move The Grease Fitting To Improve Lubricant Penetration To Suspension Frame Bearings

1990/02/12 New Pressure Switch Used In Suspension Inhibit Circuit{7200}

1990/02/12 Heavy-Duty Wiper Motor Used{7305}

1990/02/12 New Mounting Bracket Improves Operation Of Hoist Cable{5136}

1990/02/12 Improved 2U0259 Rubber Cover For Hoist Valves Is More Resistant To Heat And Contaminants{5136}

1990/02/12 Use Correct Method When Installing Center Bonded Mounts{1273,5056}

1990/02/12 Longer Nipple Prevents Mud From Covering Rear Axle Housing Breather{3260}

1990/02/12 Rework Procedures For The Hydraulic Pump Bias Piston{5070}