Relief Valve Tolerance Has Been Changed {5050}
Usage:
D20D (9MG),
D250D (6NG) Articulated Trucks
The tolerance for the relief valve, in the hydraulic circuit that lowers the truck body, has been changed from 8270 ± 1725 kPa (1200±250 psi) to 8270±340 kPa (1200 ± 50 psi).
If the relief valve for the hydraulic circuit that lowers the truck body was set at the lower end of the former relief pressure tolerance, the pressure in the circuit may not have been sufficient to raise the suspension if the machine was partially loaded.
If the suspension can not be raised with the machine partially loaded, set the relief valve pressure to 8270 ± 340 kPa (1200 ± 50 psi).
Caterpillar Information System:
1993/05/17 Steering Hoses With O-ring Face Seal Fittings Available {4304,4300}
1993/05/17 Deflector Plates Prevent Mudflaps From Coming In Contact With The Tires {4220,7252,4200}
1993/05/17 Holes Drilled Inside The Transfer Gearbox Case Can Improve Oil Flow {3106,3100}
1993/05/17 New Seals Assist In Preventing Cooling Oil Transfer From Brake To Wheel Oil {4251}
1993/05/17 Optional Bronze Thrust Disc Available {3160}
1993/05/17 Air Horn Group Now Standard To Meet Overseas Specifications {7402}
1993/05/10 New Oil Filter Base Supports Help Prevent Incorrect Oil Filter Base Installation{1306}
1993/05/10 New Gas Springs For Engine Enclosure Doors{5486,7263}
1993/05/10 New Mount Bracket Minimizes Contaminants Into Key Start Switch{1553}
1993/05/10 Decal Location{7581}
1993/05/10 Shims Used To Provide Clearance Between Pin Retainers And Truck Body{7258,7250}
1993/05/10 Sleeves Available For Rebuilding Tractor Oscillating Hitch Pin Bores{7057,7066}
1993/05/17 Door Insulation Retention Method Is Improved {7308,7300}
1993/05/17 Air Conditioner System Refrigerant Refill Capacity {7320,7300}
1993/05/17 New Radiator Tie Bars Resist Cracking {1353,1350}
1993/05/17 Battery Isolation Switch Has Been Moved To Improve Access {1411,1400}
1993/05/17 Hoist Cylinder Hoses With O-ring Face Seal Fittings Available {5057,5050}
1993/05/17 Cab Air Intake Sealing Can Be Improved {7342,7304,7300}
1993/05/17 Brake Fluid Reservoir Has Been Moved To Prevent Overheating {4291,4250}
1993/05/17 Method For Bleeding And Charging The Rear Suspension Has Been Changed {7200}
1993/05/17 Injection Pump Kits (Gasket/Solenoid) Available From Parts Service {1250,1251}
1993/05/17 New Fuel Injection Lines, Clamps, And Brackets Used In Fuel Injection Lines Groups {1252}
1993/05/24 New Snap-In Type Rod Wiper Replacement For Truck Suspension Groups And Hoist Cylinder Groups{7201,7213}
1993/05/24 Remote Grease Fittings Added To Steering Cylinders{4303,4300}