CAT Transmission and Drive Train Oil (TDTO) 50

Standards & approvals

• Cat TO-4

  Caterpillar TO-4 — transmissions, clutches and wet brakes

  Caterpillar's specification for transmission and wet-brake fluids in off-highway equipment, with strict friction and gear wear requirements.

• Allison C-4

  Allison C-4 — off-highway automatic transmission fluid

  Allison's fluid specification for off-highway and truck automatic transmissions: stable wet-clutch friction, gear protection and seal compatibility.

Specifications

Brand

Caterpillar (Cat)

Range

Cat TDTO

Category

Manual gearbox & axle oils

Viscosity

SAE 50

Manufacturer code

8267

Availability

On request

Typical characteristics

Manufacturer's description

Cat TDTO (Transmission and Drive Train Oil) is developed, tested and approved by Caterpillar to the same standards as Genuine Cat Parts. It is the preferred lubricant for Cat power shift transmissions, and most final drives and wet brake compartments, used as standard factory-fill for Cat machine compartments where TO-4 specification oils are recommended, and suitable for other manufacturers' machines that call for TO-4 or TO-4M oils. The oil prolongs clutch disc life by up to 45% and ensures long life and excellent performance for gears, bearings and friction disc material. While the TO-4 specification defines a minimum performance standard, Cat TDTO is required to pass five additional Caterpillar tests, backed by thousands of hours of field experience. This SAE 50 grade meets Caterpillar TO-4 and Allison C-4 test requirements. Typical values from the Cat technical data sheet include an API gravity of 24.7 (ASTM D287), a viscosity of 195 cSt at 40°C and 18.0 cSt at 100°C (ASTM D445), a viscosity index of 96 (ASTM D2270), and a TBN of 7.9 (ASTM D2896).

Applications

• Hydraulic fluid and manual transmission fluid for Cat power-shift transmissions, final drives and wet-brake compartments (SAE 50).

Performance & benefits

• Used as standard factory-fill for Cat machine compartments where TO-4 oils are specified.
• Prolongs clutch-disc life by up to 45%.
• Ensures long life and excellent performance for gears, bearings and friction-disc material.
• System-matched formula, engineered as an integral part of Cat power-shift transmissions, most wet-brake compartments and hydrostatic systems.
• Tested beyond the TO-4 industry standard: Cat TDTO passes five additional Caterpillar tests beyond the minimum TO-4 performance requirements.