The new Cat® C Series articulated dump trucks—725C, 730C, and 730C EJ ejector—feature new engines with more power, advanced transmission control, enhanced operator amenities, new serviceability features, and for the 730C and 730C EJ models, automatic traction control. The 725C has a rated payload capacity of 26 tons and the 730C and 730C EJ models are rated at 31 tons. The Cat C9.3 ACERT engine powers the 725C and is rated at 314 net horsepower, and the Cat C13 in the larger models has 367 net horsepower. All three models are available in Tier 4 -Final configurations, using a diesel-particulate filter and selective-catalytic-reduction system.
The Cat 6F/1R power-shift transmission, which electronically modulates clutch engagement pressures, now incorporates Caterpillar Advanced Productivity Electronic Control Strategy (APECS). The APECS system, says Caterpillar, improves acceleration, maintains torque converter lock-up (and ground speed) during critical shifts, increases rimpull, provides automatic speed holding, modifies shift points to match operating conditions (for increased fuel economy), and automatically reduces retarding forces on lesser grades in lower gears. For controlling speed on downhill grades, 730C models employ a new engine compression brake that provides 60 percent more retarding power than predecessor models. The 725C uses a fluid retarder with four operating modes.
All three new C Series models feature full-time, six-wheel drive and are equipped with wet-disc-clutch locks in the axle differentials and the inter-axle differential. On-the-go application of the locks, which assist traction in adverse conditions, is done at the 725C operator's discretion via in-cab controls, while the new Automatic Traction Control system in the 730C models applies the locks automatically—and proportionally—as ground conditions dictate.