Falk Long Term Grease- Flexible Coupling Lubricant

Facts on Lubrication

Separation — Grease is a blend of oil and a thickener or soap. These compounds are not very stable and will eventually bleed or separate under the high centrifugal forces generated in many coupling applications. Once a grease begins to separate, the thickener accumulates in the areas where lubrication is required, and rapid wear of the contacting surfaces occurs. The oil is now free to leak out of the coupling past the seals, causing premature failure of the coupling.

Service Intervals for All-Purpose Greases — It is common practice to lubricate all rotating equipment with one or two all purpose greases.

Most greases which are used as coupling lubricants were initially developed as bearing lubricants.

Bearing greases have a low viscosity and high bleed rate which is desirable to avoid heat caused by rolling friction. However, rolling friction is not present in couplings where the only movement is a sliding action caused by misalignment of shafts or thermal growth.

Bearing lubricants are adequate if the coupling manufacturer’s service intervals are followed. These intervals are usually six (6) months for gear couplings and one (1) year for grid couplings.

Maintenance & Downtime

In today’s industrial plants the cost of equipment downtime for servicing can easily exceed hundreds of dollars per hour. So rather than shutting down this critical equipment, the connecting shaft couplings are frequently allowed to run until failure occurs or until the more expensive drive components in the system require maintenance.

In an attempt to hold the line of high maintenance costs, some users have switched to non-lubricated coupling designs. This switch seldom works out for the best however, since many elastomer designs have a short life expectancy and they induce problems elsewhere in the drive system. When they do fail, the connected equipment often has to be moved to replace the element.

Now LTG — What is it?

Rexnord engineers have spent years measuring the wear rates on coupling components using various lubricants and coatings. Virtually every common industrial lubricant has been centrifuged under laboratory conditions per ASTM standard test methods for “Oil Separation from Lubricating Grease by Centrifuging.” The results of extensive research indicated that greases with high viscosities and low bleed rates produce the longest life.

Falk LTG is specially formulated to provide superior lubrication for flexible shaft couplings.

How does it work?

The consistency of Falk LTG changes with operating conditions. As manufactured it is an NLGI #1/2 grade. Working of the lubricant under actual service conditions causes it to become semifluid while the grease near the seals will set to a heavier grade, helping to prevent leakage.

LTG is highly resistant to separation, easily out performing all other lubricants tested. The resistance to separation allows the lubricant to be used for relatively long periods of time.

Benefits for your Application

  • Increased coupling life.
  • Significantly extended relubrication intervals.
  • Reduced maintenance costs.
  • Reduced downtime.
  • Superior lubrication.
  • High load carrying capabilities.
  • Usable up to 250°F (121°C).

USDA Approval

LTG has the United States Department of Agriculture Food Safety & Inspection Service approval for applications where there is no possibility of contact with edible products (H-2 rating).


Falk LTG grease is compatible with most coupling lubricants. For optimum performance it is recommended that couplings be cleaned of old grease before packing with LTG.

Extended Maintenance Intervals

Steelflex® — When Steelflex grid couplings are initially lubricated with LTG, scheduled periodic maintenance is not needed. You can now get the superior protective features of the Steelflex, plus the toughness of steel, and eliminate periodic maintenance expense. Falk recommends that such couplings be inspected and relubed only when the connected equipment is being serviced or the coupling is opened for alignment checks.

Lifelign® Gear Couplings — Re-lube intervals for sensitive gear couplings have been extended from six (6) months to three (3) years.

Thickener   Lithium Soap/Polymer
Base Oil   Highly Refined Mineral
Oil Viscosity @ 100°F (38°C)   3300SSU (715cSt)
Oil Viscosity @ 210°F (99°C)   163SSU (33cSt)
NLGI Grade   1/2
Consistency (ASTM D-217)- 60 stroke worked penetration value in the range of 315-360 measured at 77°F (25°C).
Timken EP O.K. Load (ASTM D 2509)   40 lbs.
Four Ball EP (ASTM D 2596)
Load Wear Index   46 kgf
Weld Point   250 kgf
Four Ball Wear, Scar (ASTM D 2266)   .66 mm
Dropping Point   350°F (177°C) min.
Flash Point   450°F (232°C)
Oxidation and Rust Inhibitors   Yes
Centrifugal Separation
(ASTM D 4425-84)   K36s 2/24 max.
Color   Dark Brown
Operating Range   -20°F (-29°C) to 250°F (121°C)
Operating Speed Range
Steelflex Couplings   All Speeds
Gear Couplings   See Service Manual 458-010


5 Year Warranty

A new Steelflex coupling initially lubricated with the proper amount of LTG as described in the service manual, operated within the specified ambient temperature range and installed and aligned within the limits specified in the installation manual is warranted for five (5) years against lubrication related grid member failure.


Falk LTG is packaged to suit every need.

Polybags Included with Sizes 1020-1090T couplings for initial handpacking at installation.   14 ounce cartridges For use in standard industrial lubrication guns.   35 pound pails 120 pound kegs For plants with many small couplings or large size couplings. Best for hand packing.   400 pound drums For plants with a pressurized lubrication system.   A 10-pack of 14 oz. cartridges or a case of 3-10 packs of 14 oz. cartridges. Ideal for distributor stocks.  


Required Lube Wt-Lbs
GF10 & 20
GC 02
1020T .06 (.027)      
1030T .09 (.040) 1010G .09 (.041) 1GF .09 (.041) 1010G .025 (.011)
1040T .12 (.055)            
1050T .15 (.068) 1015G .16 (.073) 1 1/2 GF .16 (.073) 1015G .063 (.0283)
1060T .19 (.086)            
1070T .25 (.114) 1020G .25 (.11) 2 GF .25 (.11) 1020G .094 (.042)
1080T .38 (.173) 1025G .50 (.23) 2 1/2 GF .50 (.23) 1025G .144 (.065)
1090T .56 (.255) 1030G .80 (.36) 3 GF .80 (.36) 1030G .201 (.093)
1100T .94 (.427) 1035G 2.00 (.91) 3 1/2 GF 1.20 (.54) 1035G .269 (.122)
1110T 1.12 (.509) 1040G 2.50 (1.14) 4GF 2.00 (.91)    
1120T 1.62 (.736) 1045G 3.00 (6.6) 4 1/2 GF 2.30 (1.0)    
1130T 2.0 (.909) 1050G 3.50 (1.59) 5 GF 3.90 (1.8)    
1140T 2.5 (1.136) 1055G 4.00 (1.81) 5 1/2 GF 4.90 (2.2)    
1150T 4.3 (1.955) 1060G 4.50 (2.05) 6 GF 7.00 (3.2)    
1160T 6.2 (2.818) 1070G 5.00 (2.27) 7 GF 9.60 (4.4)    
1170T 7.7 (3.5) 1080G 21 (9.55)        
1180T 8.3 (3.773) 1090G 27        
1190T 9.7 (4.409) 1100G 33        
1200T 12.4 (5.636) 1110G 39        
1210T 23.2 (10.55) 1120G 46        
1220T 35.4 (16.09) 1130G 72        
1230T 53.0 (24.09) 1140G 73        
1240T 74.5 (33.86) 1150G 90        
1250T 110.5 (50.23) 1160G 95        
1260T 148.1 (67.32) 1180G 110        
    1200G 150        
* Refer to Selection Guide 451-110 for larger sizes.


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