Return-Line - Cub Cadet 6X4 Shop Handbook

Chapter 8 - Caterpillar Engine and Related Systems
20. Return-line fitting See Figure 8.111.
Figure 8.111
• This is a simple elbow with no orifices or regula-
tion.
• For installation: install the bushing first, lubricate
the fitting with diesel fuel, and install it in the
bushing.
FUEL
• Diesel fuels that meet the Caterpillar Specifica-
tion for Distillate Fuels are recommended.
• In North America, fuel that meets the "ASTM
D975" specification and is identified as #1-D or
#2-D generally meet the Caterpillar standards.
• #2 diesel fuel is the most commonly used fuel.
• #1 diesel fuel or a blend of #1 and #2 are suit-
able for cold weather operation. #1 is typically
available in the winter months in regions that
experience cold winter weather.
• #1 diesel fuel has a lower cloud point and lower
pour point than #2 diesel. The cloud point is the
temperature at which the paraffin begins to shift
from a liquid structure to a crystalline (solid)
structure. The pour point is a measure of viscos-
ity. These factors make #1 diesel fuel more suit-
able to cold weather operation.
• When burned, #1 diesel fuel produces less
energy per unit of volume than does #2 diesel
fuel.
• A vehicle that is fueled in one climate and trans-
ported to a different climate may experience
fuel-related starting or performance issues.
• SVO, bio-diesel, and other organic fuels are
not recommended for use in this vehicle.
ADJUSTMENTS:
ENGINE SPEED AND THROTTLE LINKAGE
1. The engine should idle at 1,200 RPM:
See Figure 8.112.
Photo-tach:
suitable for use
on the driving element
• Slower idle speeds will result in poor idle quality,
reduced flow of cooling air, and reduced oil flow.
• Higher idle speeds will result in harsh gear
selector action and possible internal damage to
the transfer case.
2. Top no-load speed should be 3,600 RPM:
See Figure 8.113.
• Slower top no-load speeds will result in dimin-
ished performance.
• Higher top no-load speeds will result in unsafe
operating conditions and possible over-speed
engine failure.
260
Figure 8.112
Figure 8.113