Lube Flashcards
Lubricant is any substance that reduces?
Friction by sliding
Lubricant film, does what
Two surfaces to never actually touch
Another reason for lubrication is to help what
Dampen mechanical shock
Oil coolers have what to radiate heat
Metal fins
Grease does what when left exposed
Develops a skin to keep dirt out
Crude oil contains what
Over a million different hydrocarbon compounds
The most important property of lubricating oil is
It’s viscosity
Standards for industrial lubricants in America are
SUS saybolt universal seconds
Greases are chosen for applications where
Frequent lube is not possible
The term used for grease when it’s temp causes the grease to change from a solid to a semisolid is what
Dropping point or melting point
Foam inhibitors used in hydraulic systems are called
Antifoam agents
A chemical reaction with metal surfaces a thin coating of metal sulfide or chloride forms on the metal, this is called
Extreme pressure additives
What keeps water from breaking up into droplets by keeping the waters film of contaminant intact
Demulsifiers
What has mostly impurities, metal oxides, and gases from the air
Boundary lubrication
When two moving surfaces are completely separated from each other it has what type of lubricant
Full film lubrication
The higher the ratio of a paraffin base oils to naphthene base oils the…
Higher the viscosity index of a given blend it will be
What kind of oil is so good it’s used as the standard to measure other oils
Turbine oil
What is the most essential additive of a hydraulic system oil
Antifoam additive
Spindle oils are …
Premium oils low in viscosity
What kind of oil is sometimes compounded with animal fat to make them stick to the surface being lubricated
Steam cylinder oils
I What is the purpose for soap or thickener in a grease
It serves as a holding agent for the oil, it releases the oil at a slow rate
In applications where temp rises above 180 the water content begins to disappear and dry out what type of grease
Calcium soap grease
What kind of grease is great with contact with water
Calcium soap grease
What kind of grease is used in the absence of water
General purpose grease like sodium soap grease
The main disadvantage to general multi purpose grease is what
They do not work well around water
The best all around grease is what
Lithium soap grease
Non soap thickeners, metal based complexes are
Organic molecule that traps metal ions in a lattice of atoms
Additives in grease do what
They keep grease from undergoing chemical changes/makeup
EP greases depend on what for high film strength
Lubricating oil component that contains additives
Most commonly used grease for water repellent are
Calcium soap base
Thin plate like flakes in a grease is what kind of additive
Lamellar in nature
Synthetic liquid lubricant is what kind of compound
Polymer
One kind of lube delivery is the
Regulation of the lube
Drip feeding oiling is referred to as
Gravity lubrication
In natural lubrication what is used as an oil sump for the bath
A portion of the machine housing
In pressure circulating systems what kind of pump is most likely used
Gear type pump
Oil mist lube can give you (blank) quantities of oil and operates on very (blank) air pressure
Large,\ low
In certain systems the pump will both…
Increase pressure and meter the oil
A force feed lubricator is regulated how
Lube discharged is controlled be a regulating screw mounted on the opposite side of the pivot point of the piston drive
Indirect metering systems…
Have separate metering devices to meter the oil
What reverses the lube flow
Control valve on the discharge side of the pump
Progressive metering is also referred to as
Centralized lubrication
If lube is stored outside what must be taken into consideration
The environment
Grease put into a system should be done at what temp
Room temp
Reclamation is what
Removing oil to be treated and reused
The most effective way to separate contaminates from oil is
Gravity settling
Filter elements used for the final filtering are made of
Sintered metal
What is the single greatest cause of lube failure
Contamination
An oiler route is what
Done to make sure no machines are skipped
One of the best ways to keep from using the wrong lube on a machine is to
Color code the fittings
The frequency of required lubing in a 5 day work week, monthly means how many days between lubing
20
Lubricants can take the form of liquid and ….
Gases, solids, and semisolids
The main purpose for lube is
Refusing friction
Resistance to overcome when starting motion across one part to another is
Static friction
The cooling effect from a lube is mainly from its ability to
Reduce friction
Corrosion can be prevented is bare metal can be shielded from
Oxygen
Additives in oil prevent corrosion by
Neutralizing acids
Mineral oils are better than vegetable oils because
They are more stable
Liquid formed by the condensation of crude oil vapors is called
Distillate
In refineries vapors from boiling crude oil are collected where
Various levels in a fractionating tower
The organic compounds that make up petroleum are classified as
Hydrocarbons
Most molecules in crude oil are
Long and chain like
The SAE number of a oil is its
Viscosity
Light oils are for
High speed low pressure
What is the hardest or the stiffest grease number
6
What accurately describes the load on a lube
Pressure
Oils that prevent or retard the formation of sludge contain what
Oxidation inhibitor
Extreme pressure additives contain chemicals that
React with metal surfaces
Carbon and varnish deposits are kept from forming on metal surfaces by
Detergent dispersants
What is the purpose of an emulsifying agent
Keeps water from coming in contact with metal
Best lube film type for reducing friction
Full film lube
Hydrostatic full film lube is often accomplished with the aid of what
Air pump
High speed light duty bearings require
Light oils
As a rule grease is used for lubricating plain bearings when shaft speeds are
Less then 300 RPM
What is the most common cause of lube problems in antifriction bearings
Too much lube
Naphthene base oils are good for what
Refrigeration equip
The higher the ratio in oils the better the
Viscosity index
Steel mill circulating oils need
Resistance to heat and water
Machine oils are useful in applications where
Oil loss is steady
Way oils are a type of
Machine oil
Refrigeration oils include a low
Pour point
Most internal combustion engines oils are
Paraffin base oils
Oils used in low temp or high speed applications should have a blank viscosity
Low
What is the usual percentage of oil content in a grease
70 to 90%
Channeling in a grease bearing is caused by what
The grease being too heavy
Every soap is a combination of a metal ion with a
Fatty acid
Calcium soap greases are known for their
Resistance to water
Barium soap grease should never be used in
High speed applications
Greases resistant to both water and temp extremes are
Lithium soap greases
Silica gel grease does not
Soften or melt
Bentonite grease has the best
Water resistance
Frequent greasing of a plain journal bearings depends mostly on the
Bearing speed and operating temp
Additives that act alone as a lube appear in the form of
A dry film lube
Tallow sperm oil and rapeseed oil are among the additives used in grease to
Provide additional oiliness to the grease
Hydrophobic additives are actually
Water repellent compounds
Graphite mica and borax are referred to as
Lamellar solids
Silicone greases are used in bearings that are
Sealed
Dry film lube is typically applied as a
Spray paint
Product contamination caused by leaking bearing seals in a process machine is virtually eliminated by
Dry film lube
For temps below 600 which type of binding agent works best with a dry film lube
Plastic
A good lube to use on electrical switches and relays is
Powdered molybdenum disulfide
How should a lubricating device be filled or adjusted
Safely
What cost factor should be considered when a lube device is purchased
Initial and secondary
In a drip feed lubricator the flow is controlled by
A needle valve
The ring on a ring oiler is blank times the diameter of the shaft on which it rotates
1.5
What kind of system are pressurized oil lube that have internal sumps with external pumps and piping
Wet sump systems
What types of pumps are used in pressure lube systems
Positive displacement
Oil mist lube systems should operate at what pressure
5-10 psi
A sight glass in a lubricator always indicates what
Flow
Sight glass indicators are usually installed on the suction side of what
High pressure systems
What other name is given to metered lubrication
Indirect
Metered lubrication is also called header or
Progressive systems
In a two line header system the lines are vented alternately by
A control valve
The pump is usually stopped in a progressive system as lube passes which outlet port
Last
The best method for moving 55 gallon drums are by
Pallet
Before you open an oil drum make sure the top is
Clean
How can you prevent the build up of old stock
Place new stock behind old stock
The continuous processing of oil to remove all contaminants is known as
Purification
What is the purpose of the centrifuge in a lubrication system
Separate contaminants and purify
Simple oil strainers are made of
Wire screen
Porous stone or sintered metal filters can exclude particles from fluids in the range of
.5 to 2 microns
Before you can have an efficient lubrication program you must first
Survey the lubrication requirements
The machine ID number is usually the same as the
Inventory number
Even a computerized lube management system may fail unless you also have
Capable employees at all levels
Computerized lube management systems need to be flexible because
Floor plans may be revised or new equipment added
A change card is
An alert for the oiler to drain and refill
Discrepancy reports are written by the
Oiler
