Hydraulic Adjustable Skid Steer Box Grader CH Series | Roadrunner

📘 Overview

This Roadrunner skid steer grader attachment is the hydraulic member of the C-Series (CH Series): the lead cutting edge is set from the cab on a hydraulic cylinder while manual screw adjusters trim the trailing edge, so depth can be changed mid-pass instead of stopping to wind a handle. It works across a 2" below to 2" above grade range on a depth gauge marked in 1/2" steps, and independent left-right adjustment is what lets it cut and hold a crown on a gravel road. There are five choices to make: blade width (72", 84" or 96"); Single Hydraulic or Dual Hydraulic with a 14-pin wiring harness, which adds independent electro-hydraulic control of both sides; a Standard Smooth Blade or the Serrated Blade for hard-packed gravel; whether to add the bolster wheel kit; and the mount — Universal Skid Steer Quick Attach, a Category 1 & 2 three-point hitch, or the Combo carrying both. The optional bolster wheel kit adds a pair of pneumatic caster wheels that lift the front of the grader about 1/2" off the ground so it spreads new material without gouging. Roadrunner builds it in Lancaster County, Pennsylvania and backs it for 36 months.

⚙ How the CH Series Grader Attachment Is Built

• Hydraulic depth adjustment on the lead blade — a 3x4 cylinder sets the front cutting edge from the operator's seat; the trailing edge keeps a manual screw adjuster for fine trim.
• Depth gauge marked in 1/2" increments — a mechanical indicator showing blade height relative to grade across a +2" to -2" range, so a setting can be repeated pass after pass.
• Independent side-to-side adjustment — drop one side below the other to build and maintain a road crown, the single job a fixed box blade cannot do.
• Dual blade configuration — serrated front cutting blade to break hard-packed material, smooth rear cutting blade to level and finish behind it.
• Dual hydraulic option with a 14-pin wiring harness — adds a second cylinder and the electrical harness that drives both sides independently from the cab.
• Bolt-on motor grader cutting edges — standard 5/8" edges on plow bolts; the optional serrated edge is a direct swap for the smooth one.
• Replaceable AR400 hardened skid bars — the sacrificial wear surface under the side panels, bolted on with 3/4"-10 hardware.
• Hydraulic flow control unit on the dual configuration — a valve block in a bolted cover box, factory set to position 3 and adjustable to suit your machine's GPM so the cylinders raise and lower smoothly rather than snatching.
• Two depth indicator rods on the dual configuration — one per side, so left and right cut heights are read independently instead of inferred.
• Flat-face quick disconnects supplied — one male and one female skid-steer-style coupler ship with the grader, and hose saver springs are fitted to stop the hoses pinching.
• Greaseable adjustment thread and serviceable parts list — Roadrunner publishes a full parts breakdown covering the side panel, blades, hydraulics and depth gauge.
• 6" blade height, 10-degree blade angle — Roadrunner's published blade geometry.
• Two-stage zinc primer with powder coat — over a heavy-gauge American steel frame, welded and finished in Lancaster County, Pennsylvania.

🔑 What the Hydraulic Adjustment Actually Buys You

• Depth changes without leaving the seat — as a skid steer driveway grader on ground that runs from soft fill to hard-packed base, the CH Series is re-set on the move where a manual box grader has to be stopped and wound by hand.
• A repeatable setting, not a guess — as a skid steer grading attachment, its 1/2" gauge marks mean the second pass can be cut at exactly the same height as the first, which is what produces a flat pad rather than a wavy one.
• Crown control from the cab — this is where a skid steer road grader earns its keep: dropping the right-hand side one or two marks sheds rainwater to the shoulders; standing water is what turns a gravel road back into potholes.
• The serrated edge earns its price on hard-packed gravel — a smooth edge rides over a sun-baked surface, a serrated edge bites into it, so the choice is really about how compacted your material is rather than about durability.
• The bolster wheel kit stops gouging in soft ground — with the kit fitted the tires carry the front of the grader about 1/2" clear of the ground, so it spreads new stone evenly instead of dipping into low areas and cutting into them.
• Wear parts are bolt-on consumables — cutting edges and AR400 skid bars are replaced with hand tools, so the frame outlives several sets of edges.

📊 Roadrunner CH Series Grader Specifications

🔄 CH Series Sizes Side by Side

Overall width is 4" greater than the nominal blade width on every size, because the side panels sit outboard of the cutting edges. Overall height is measured to the top of the arch tube weldment that carries the hydraulic cylinder.

📋 Building Your CH Series Grader — Five Choices

🔗 Accessories That Bolt On to the CH Series

• Bolster wheel kit — two pneumatic caster wheel assemblies on 18.5 x 8.5-8 wheels, mounted on a bridge weldment and tube frame that bolt to the front of the grader. Once fitted the tires rest on the ground with the front of the grader raised about 1/2"; washers on the wheel shafts set that clearance. Grease the wheel points at least monthly, and keep the wheels out of stone and snow piles.
• Three-point attachment kit, Category 1 & 2 — a three-point tower weldment with side mounting plates and a back plate. The side plate spacing is set during installation to suit your tractor's lower arms. Pin the lower arms first, then the top link, and adjust the top link so the grader sits parallel to the ground in the grading position.
• Serrated cutting edge — a direct replacement for the standard smooth edge on the same 5/8" plow bolts, for breaking up hard-packed gravel.

🚜 Which Machines Fit the CH Series Grader Attachment?

This grader is offered in two mounting configurations — select the one that matches your machine:

Universal Skid Steer Quick Attach (SSQA) — fits skid steer loaders and compact track loaders with a standard universal quick attach coupler, including:

Category 1 & 2 three-point hitch — fits compact and utility tractors. Roadrunner's own manual also covers a tractor front-end loader fitted with a quick attach adapter.

Hydraulic and machine requirements. The CH Series needs an auxiliary hydraulic circuit rated to a maximum of 3,000 PSI; one male and one female flat-face skid-steer-style quick disconnect ship with the grader. No case drain line is specified in Roadrunner's owner's manual. The grader has no hydraulic reservoir of its own, so it draws from the machine's oil while the cylinder and hoses are first charged — check the machine's oil level with the blades in the +2 position. The carrier must have ROPS and a seat belt, and Roadrunner rates the C-Series for machines up to 110 HP or a 3,000 lb lift capacity; an oversized machine can damage the grader.

If you choose Dual Hydraulic. The 14-pin electrical connection is what carries the joystick control to both cylinders. Roadrunner publishes 14-pin pin-out diagrams for these machine brands:

Set the machine's auxiliary hydraulics to continuous flow, then use the joystick buttons to run the up and down function on either side. If the 14-pin connector ships loose, Roadrunner's wiring diagrams give the pin positions for your machine.

Compatibility is determined by mount type and hydraulic capability, not by machine brand — confirm your quick attach configuration, or your hitch category, and your auxiliary circuit before ordering. Everything needed to confirm fitment is on this page — add the grader to your cart to see delivered pricing for your address.

❓ CH Series Grader Questions, Answered

🎥 See the CH Series Grader Working