Self Study Tool Grease
Basics of Grease - Contents
Additive Agent
Few percent Lubrication
P
Puffing
Agent
Approx 20%
Base Oil
Approx 80%
Soap Fiber
Function
Base Oil Puffing Agent Additive Agent
Shear Stability Shear Stability
Heat Stability Heat Stability Extreme-pressure Others
Oxidation Stability Water Resistance Decrease Wear Anti-oxidation
Easier Handling Extend interval frequency Anti-rust
1 Parts Dept.
Self Study Tool Grease
Grease Performance Comparison
3500
(# of oscillations counted before pin galling occurs on the machine)
KOMATSU Hyper Grease
3000 Recommend
High Performance Molybdenum
Grease Grease
2500
Seizure Resistance
2000 Lithium EP Grease
1500
Commercially
available
1000 Lithium Grease
Commercially
available
500
Calcium Grease
0
0 50 100 150 200 250 300
Heat Tolerance
(dropping point temperature, ℃)
2 Parts Dept.
Self Study Tool Grease
Types of Grease
Type
Characteristics Recommended Not
(KES symbol)
Lithium Soap is added as puffing agent.
Lithium EP Grease Reasonable Cost.
(G2-LI) General purpose use
Molybdenum disulfide* is added as puffing agent.
Molybdenum Grease Higher Cost.
Suitable for medium and heavy load part
(Especially for pin & Bushings. Not for bearings.)
(LM-G, LM-P)
Hi efficiency complex lithium grease.
Hyper Grease Patent applied
(G2-T) Suitable for medium and heavy load part
(All purpose. Especially for bearings)
KOMATSU Recommend High Performance Grease
Calcium Soap is added as puffing agent
Calcium Grease Low Cost thus Low Lubrication.
(G2-CA) Not recommended for construction machinery.
Molybdenum Disulfide* = Solid lubricant due to its low friction property and relatively high temperature.
3 Parts Dept.
Self Study Tool Grease
Major Feature of Genuine Grease
High
Heat Water
load-bearing Anti-wear
Resistance Resistance
capacity
Hyper Grease
(Lithium Complex) ◎ ◎ ◎ ◎
Molybdenum
Grease ○ ○ ○ ○
Lithium EP Grease ○ - - ○
◎ Optimum ○ Adapted - Acceptable Price Comparison
-10%
-50%
-G
-G
m
Molybdenum Hyper Grease Lithium EP
iu
LM
LM
th
Grease
Li
Grease
4 Parts Dept.
Self Study Tool Grease
Caution for Handling
◼ Do not mix with other grease.
◼ Mixture of different type of grease cause chemical reaction and
it will deteriorate grease performance.
◼ Take out an old grease before applying new grease.
◼ Replace dust seals when any damage was observed.
◼ Dust seal protect from dust and water penetration into sliding part. Push Out Old Grease
Grease Pool
Old Grease
Dust Seal
◼ Apply soft type grease for the machine that is equipped with Bushing
Auto Grease System
◼ If hard type grease is used for automatic grease feeder,
it may not distribute grease thoroughly in the system.
◼ Do not apply Molybdenum Grease for bearings*.
◼ Too much lubrication→ Cyclic motion of small amplitude →
→ Fretting Wear may occur.
* Example: Swing Circle Bearing for PC
5 Parts Dept.
