Cat 12H ES to 140G specifications

Regional equipment and the blade's working position

ES identifies a particular H-Series equipment arrangement. Caterpillar's December 1995 introduction describes European safety and emissions equipment, including supplementary steering and approved air reservoirs. Its standard-equipment list also names hydraulic blade sideshift and tip, a locking differential and engine-power management.

Treat those as the bulletin's configuration, not proof that an imported or subsequently modified grader still has every original component.

The H transmission's extra forward ratios changed more than road speed. Caterpillar placed another working ratio between the earlier G transmission's second and third, and added a higher working ratio for snow removal. The longer frame and revised linkage also expanded blade placement.

These changes explain why a similar engine rating does not make the older 140G and an H grader interchangeable for ditch work or maintaining a windrow.

The 120H NA brochure distinguishes a standard engine arrangement from optional variable horsepower. Its higher rating applies only in specified gears. A headline maximum does not describe low-gear output.

Check which arrangement is installed before using the power column to compare the NA and ES machines.

Blade float is useful detail beyond horsepower. The NA brochure describes floating both lift cylinders to follow the road while clearing snow, or floating one cylinder while controlling slope with the other. Its hydraulic circuit proportions available flow among simultaneous functions.

When demand exceeds pump delivery, cylinder speeds fall together. That behavior differs from judging performance by one unloaded cylinder's speed.

On the 140G, front-wheel steering and frame articulation are separate measurements. The original brochure lists a larger angle for the steered wheels than for the articulated frame. It also describes a live-spindle front axle: the spindle turns inside a sealed bearing compartment.

Oil-disc service brakes sit outboard of the tandem driveline. Those are useful inspection locations when checking steering play and identifying the braking arrangement. The brochure's operating weight includes its specified blade and equipment; it is not a universal weight for every surviving 140G.