Issue link: http://read.dmtmag.com/i/713025
AUTOM ATIC TR A NSMIS SION FLUID S (ATFS) ATFs have to hold loads and encourage smooth shifts. Therefore, they have a high dynamic coefficient of friction with a moderate static co‑efficient of friction. ATFs do contain friction modifiers, moderating static friction to avoid harsh shifts. TO ‑ 4 F LUID S The most dramatic friction characteristics are in TO‑4 fluids for powershift transmissions. TO‑4 fluids have the highest static co‑efficient of friction for fast lock‑up and outstanding holding capacity. The sharp upward point in this chart depicts the TO‑4's tight, firm lock‑up. Reviewing the different friction characteristics of transmission fluids show how incorrect fluid choice can be a detriment to equipment and its operation. Proper transmission fluids are a wise investment that provide returns in the long run. T R A N S M I S S I O N F L U I D S : A C H A R A C T E R I S T I C C O M PA R I S O N FLUID FEATURES TO‑4 FLUID THF Dexron III HD/ TES‑389 Friction Grabby Most Slippery Slippery EP/AW Very Good Best Good Oxidation Good Good Best Low Temperature Poor Good Best Water Sensitivity Wet Anti‑foam Test Very Good Not Tested Color Dyed (some) — Dyed Viscosity Grade Kv at 100°C Various (6‑26) 10W‑30 (9.5–10.5) 0W‑20 (7.0–7.5) Powershift Transmission Fluids TES-389 TO-4 Torque, Nm Torque, Nm Very High Static Fricton Sliding Speed Decreasing Sliding Speed Decreasing Medium Static Fricton B A C K N E X T T 2 L A B C H E C K E N G i N E T R A N S M i S S i O N A X L E F i F T H W H E E L & G R E A S E S S U P E R C L E A N H O M E H Y D R A U L i C F L U i D S i M P O R TA N T T R A N S M i S S i O N F L U i D P R O P E R T i E S