Case 621C - Diesel Fuel Specifications

1002-4
DIESEL FUEL SYSTEM
Use No. 2 diesel fuel in the engine of this machine. The use of other fuels can cause the loss of engine
power and high fuel consumption.
In very cold temperatures, a mixture of No. 1 and No. 2 diesel fuels is temporarily permitted. See the
following Note.
NOTE: See your fuel dealer for winter fuel requirements in your area. If the temperature of the fuel
lowers below the cloud point (wax appearance point), wax crystals in the fuel will restrict the fuel filter
and cause the engine to lose power or not start.
The diesel fuel used in this machine must meet the specifications as shown below in, "Specifications for
Acceptable No. 2 Diesel Fuel", or "Specification D975-81" of the American Society for Testing and Materials.
Fuel Storage
If you keep fuel in storage for a period of time, you can get foreign material or water in the fuel storage tank.
Many engine problems are caused by water in the fuel.
Keep the fuel storage tank outside and keep the fuel as cool as possible. Remove water from the storage
container at regular periods of time.
Fill the fuel tank at the end of the daily operating period to prevent condensation in the fuel tank.
Specifications for Acceptable No. 2 Diesel Fuel
API gravity, minimum .................................................................................................................................. 34
Flash point, minimum .................................................................................................................. 140°F (60°C)
Cloud point (wax appearance point), maximum .................................................. -5°F (-20°C) See Note above
Pour point, maximum ........................................................................................ -15°F (-26°C) See Note above
Distillation temperature, 90% point ...................................................................... 540 to 640°F (282 to 338°C)
Viscosity, at 100°F (38°C)
Centistokes .................................................................................................................................. 2.0 to 4.3
Saybolt seconds universal ............................................................................................................. 32 to 40
Cetane number, minimum .................................................................. 43 (45 to 55 for winter or high altitudes)
Water and sediment, by volume, maximum .................................................................................... 0.05 of 1 %
Sulphur, by weight, maximum ........................................................................................................... 0.5 of 1 %
Copper strip corrosion, maximum ........................................................................................................... No. 2
Ash, by weight, maximum ............................................................................................................... 0.01 of 1 %
Bur 7-12131 Issued 4-00
Printed in U.S.A.