SHOE-TRACK 2465750 - Caterpillar

Recommendations for Lube Oils for the Power End
Caterpillar recommends the use of gear oils with extreme pressure additives for the plunger pump. In order to achieve optimum performance, follow the recommendations below.General Service Gear Oils
The use of synthetic gear oils is recommended in order to achieve optimum oil film thickness, reduced friction, improved startup of the pump and optimal wear protection. The temperature of the pump should not exceed 79° C (175° F) during use. The following characteristics are required:
Viscosity grade: 75W - 90, rated for extreme service
Viscosity Index: 135 minimum
Viscosity of 80 SUS minimum at 99° C (210° F)
Pour point: 1.7° C (35° F)
Timken test rating: 50 lbs for non-SAE grades only Alternate Seasonal Conventional (Non-Synthetic) Gear Oils
Alternate seasonal conventional (non-synthetic) gear oils can be used in the plunger pumps if both of the following conditions are met:
The oils must have an extreme pressure additive.
The oils must have a viscosity index of 93 or higher.Non-SAE grade gear oils must have a Timken test rating of 45 lbs minimum.Refer to Table 1 for the recommendations for conventional gear oils.
Table 1
Recommendations for Conventional Gear Oils    
Type of Oil (1)     Pour Point (Min)     SUS Viscosity at
99° C (210° F)     Oil Viscosity     Minimum Temperature     Maximum Temperature    
Cat Gear Oil (GO)
API GL-5 Oils    
−18° C (0° F)     85     85W - 140 (2)    
0° C (32° F)    
32° C (90° F)    
−7° C (20° F) 124     85W - 140 (2)    
4° C (40° F)    
43° C (110° F)    
−18° C (0° F) 75     85W - 90 (3)    
−9° C (15° F)    
21° C (70° F)    
( 1 ) Cat oils are the preferred oils. All other commercial oils are second choice oils.
( 2 ) The operating temperature of the plunger pump must not exceed 80° C (175° F) during operation.
( 3 ) The operating temperature of the plunger pump must not exceed 54° C (130° F) during operation.Recommendations for Oil for the Fluid End
The use of an optimal plunger lubricant is critical to the achievement of full performance and service life that is designed and built into the pump. The use of the recommended oils can reduce horsepower robbing friction, reduce fuel consumption and increase the net amount of hydraulic horsepower delivered by the pump. The use of a modern machine tool Way Oil for improved lubrication of the plungers and packing is highly recommended by Caterpillar. In an area where a Way Oil is not available, a suitable Rock Drill oil may be substituted.The use of Cat HYDO Advanced oils, SAE 10 and SAE 20 are acceptable for this application.Note: The use of lubricants that do not meet these recommendations is unacceptable and may result in shorter plunger life, shorter packing life and premature failure of these components.Proper lubrication is critical during the start-up of the plunger pump. Lubricant for the plunger must begin to flow freely to the stuffing box