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LUBRICATION
800D
4-2
Published 5-27-2018 Control # 039-06
Hydraulic Oil
Oil in a hydraulic system serves as the power transmission
medium, system lubricant and coolant. Selection of the
proper oil is essential to ensure satisfactory system
performance and life. The most important factors in selecting
an oil for hydraulic service are viscosity and antiwear
additives.
Viscosity.
The oil must have proper viscosity to provide a
lubricating film at system operating temperature.
Oil viscosity is important because it has a direct bearing on
efficient transmission of power. An oil must flow readily
through the system with a minimum of pressure and flow
loss. Positive lubrication depends on viscosity. The oil must
be sufficiently light to get between the components machined
surfaces and maintain a lubricating film at system operating
temperatures. Oil too light may cause the following
conditions in the system.
1. Excessive leakage.
2. Lower volumetric efficiency of the pump.
3. Increased component wear.
4. Loss of system pressure.
5. Lack of positive hydraulic control.
6. Lower overall efficiency.
Oil too heavy may cause the following conditions in the
system:
1. System pressure drop.
2. Increases system temperature.
3. Sluggish system operation.
4. Low mechanical efficiency.
5. Higher power consumption.
The following oil viscosity characteristics are recommended:
•
80 to 180 SUS optimum at system operating
temperature.
•
60 SUS minimum at system operating temperature.
•
7500 SUS maximum at starting temperature.
•
90 Viscosity Index (VI) minimum.
Note:
On units equipped with self-leveling
platforms, low temperature service oils are
necessary to provide proper boom functions at
temperatures below +10°F(-12°C).
Regardless of temperature and oil viscosity, always use
suitable start-up procedures to ensure adequate lubrication
during system warm up.
Note:
Operation of the crane with incorrect
hydraulic oil in sub freezing temperature (below
32°F, 0°C) can cause damage to the extend
cylinder.
Antiwear Additives.
Excessive wear in the system may
cause a loss in volumetric efficiency, and may cause
shutdowns for maintenance. An efficient antiwear oil protects
the components against rusting, resists oxidation and helps
prevent wear.
Standard Hydraulic Oil.
(32°F to 100°F) (0°C to 38°C) The
factory fill standard hydraulic oil is Exxon Mobil 424 10W-30.
This fluid is acceptable for operating temperatures above -
9°C (15°F).
Intermediate Hydraulic Oil.
(-10°F to 80°F) (-23°C to 27°C)
For colder operating environments, the standard fluid may be
replaced with a Low Service Temperature Multi Viscosity
Hydraulic Oil with High Viscosity Index 175+. Typical fluids
are ESSO UNIVIS N-22 and CHEVRON RYKON PREMIUM
Oil MV or equivalents.
Wide Range Intermediate Hydraulic Oil.
(-30°F to 80°F) (-
34°C to 27°C) For even colder operating conditions, the
standard fluid may be replaced with a petroleum based fluid
developed especially for colder environments. A typical fluid
is Petro Canada Premium Plus All Season Hydraulic Oil or
equivalent.
Arctic Hydraulic Oil.
(-10°F and below) (-23°C and below).
In general, petroleum based fluids developed especially for
low temperature service may be used with satisfactory
results. However, certain fluids, such as hologenated
hydrocarbons, nitro hydrocabons and phosphate ester
hydraulic fluids might not be compatible with hydraulic
system seals and wear bands. A typical fluid is Texaco
Aircraft Hydraulic Oil 15 or equivalent. This hydraulic oil is
not recommended for service in ambient temperatures
above 32°F (0°C).
If you are in doubt about the suitability of a specific fluid,
check with your authorized National Crane distributor or
Manitowoc Crane Care.
Lubrication Points
A regular frequency of lubrication must be established for all
lubrication points. Normally, this is based on component
operating time. The most efficient method of keeping track of
lube requirements is to maintain a job log indicating crane
usage.
All oil levels are to be checked with the crane parked on a
level surface in transport position, and while the oil is cold
unless otherwise specified.
On plug type check points, the oil levels are to be at the
bottom edge of the fill port.
Fo
r
Reference
Only
Содержание National Crane 800D
Страница 1: ...Operator and Service Manual National Crane 800D F o r R e f e r e n c e O n l y ...
Страница 4: ...F o r R e f e r e n c e O n l y ...
Страница 98: ...MAINTENANCE 800D 3 10 Published 5 27 2018 Control 039 06 THIS PAGE BLANK F o r R e f e r e n c e O n l y ...
Страница 194: ...SPECIFICATIONS 800D 8 4 Published 5 27 2018 Control 039 06 THIS PAGE BLANK F o r R e f e r e n c e O n l y ...
Страница 216: ...INSTALLATION 800D 9 22 Published 5 27 2018 Control 039 06 THIS PAGE BLANK F o r R e f e r e n c e O n l y ...
Страница 232: ...CRANE INSTALLATION 800D 10 16 Published 5 27 2018 Control 039 06 THIS PAGE BLANK F o r R e f e r e n c e O n l y ...
Страница 252: ...SCHEMATICS 800D 2 Published 5 27 2018 Control 039 06 F o r R e f e r e n c e O n l y ...
Страница 255: ...F o r R e f e r e n c e O n l y ...
Страница 256: ...F o r R e f e r e n c e O n l y ...