- Powershift drivetrains (TO-4)
SAE 10W
Heavy-duty powershift transmission, gearbox and final drive oil, Caterpillar TO-4
Official approval
Off-road equipment transmission fluid (ZF class 03C)
ZF list of admitted lubricants for ZF torque-converter transmissions in off-highway equipment (chapter 03).
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.
Komatsu KES 07.868.1 — hydraulic fluid
Komatsu standard for hydraulic fluids, with in-house wear and low-temperature requirements.
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.
| Property | Typical value | Method |
|---|---|---|
| Density @ 15 Ckg/l | 0.89 | ASTM D4052 |
| Flash point, Cleveland Open Cup°C | 202 | ASTM D92 |
| Kinematic viscosity @ 100 Cmm2/s | 6.3 | ASTM D445 |
| Kinematic viscosity @ 40 Cmm2/s | 42 | ASTM D445 |
| Pour point°C | -33 | ASTM D97 |
| Viscosity index | 96 | ASTM D2270 |

Mobiltrans HD 10W is an extra high performance, heavy duty transmission and drive-train lubricant from the Mobiltrans HD series (10W, 30, 50 and 60), engineered to meet or exceed the requirements of the rigorous Caterpillar TO-4 specification. The series is uniquely designed to optimise the performance of powershift transmissions, gearboxes and final drives, and provides maximum protection in hydraulic applications even in high-pressure systems. Selected base oils and an advanced additive system deliver the precise performance parameters needed to maximise productivity of construction, quarrying and mining equipment operating in severe conditions, offering a clear performance advantage over mixed-fleet engine oils and older lubricants meeting only Caterpillar TO-2. This SAE 10W grade has a kinematic viscosity of 6.3 mm²/s at 100 °C and 42 mm²/s at 40 °C, a viscosity index of 96 and a pour point of -33 °C. It is recommended for heavy duty transmissions, gearboxes, final drives and hydraulic systems in off-highway mining, construction, quarrying and agriculture, and for most mobile equipment hydraulic applications. It is also recommended for manual, powershift and automatic transmissions calling for Allison C-4 fluids, including Twin Disc transmissions and transmissions calling for Type F fluids. Mobiltrans HD 10W carries ZF TE-ML 03C approval, is recommended for applications requiring Allison C-4 and Komatsu KES 07.868.1, and meets or exceeds Caterpillar TO-4.
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