The H7002C Spring-Loaded Roller facilitates the tarp deployment and retraction on Pioneer Rack-N-Pinion tarp systems. The extruded aluminum roller housing contains an internal shaft and coil spring, along with several precision-engineered components which give the roller its durability and strength. This roller mounts between the tarp arms, and is lifted over the load rather than being mounted at the front of the chassis, on top of the gantry tower, like the H7002 Roller. This roller is compatible with the Shurco/Donovan SWAT 1803805

The roller is driven by the internal spring, which is preloaded with tension at the time of installation. The torsional pressure stored in the internal spring causes the roller to automatically roll up the tarp as the arms move the roller forward over the load.

Important Note: Please see winding instructions to avoid roller issues. Wind counter clockwise from driver side (see full installation guide for complete details). Tarp should roll under the roller.

H7002C Rebuild Components:

Please note, it is extremely difficult to replace parts on this roller. The parts are treated with medium-duty Loc-Tite thread locking adhesive to prevent fixtures and fasteners from coming loose during the daily abuse that these rollers take. The internal steel components may develop rust over time, and any dents or slight bending in the housing make it nearly impossible to remove the bearings and cones. If it is a new roller, and you accidentally wound the wrong way and broke the spring tails that hook into the spring-anchor tabs, then you may have a chance at replacing the spring, but generally speaking, the time and labor needed to rebuild will almost certainly be more than the cost of a full replacement. But nevertheless, here the individual parts:

• Pioneer H7002C Tarp Roller Assembly

  Parts List:

  • H7006: 1-Inch Roller Bearings (Quantity: 2)

  • H7008A: Internal Coil Spring

  • H7005A: Driver-Side Spacer

  • H7005D: Driver-Side Aluminum Cone

  • H7007A: Tab for Driver-Side Cone

  • H7007B: Tab for Passenger-Side Cone

  • H7005B: Passenger-Side Spacer and Cone Assembly

  • H7003AL: Extruded Aluminum Roller Housing, 99.5 Inches x 3.5 Inches

  • H7004B: Steel Roller Shaft, 108 Inches x 1 Inch

  • HR2010: Saw Tooth Ratchet Gear

  • HR2026: Ratchet Gear Roll Pin

  Not Included:

  • Tarp mounting hardware: (9) 3/8"-16 x 3/4" bolts and (9) 3/8" flat washers

  • HR4780-1 Winding Disk

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  Care and Maintenance Instructions

  Warning: The spring-loaded roller drives the rolling function of the tarp system and is under high torsional pressure. Incorrect handling or improper loading can cause internal spring failure, damage, or personal injury. Always follow instructions carefully—do not attempt to “figure it out.”

  Guidelines for Long Roller Life:

  1. Prevent slamming: Do not allow the roller to slam onto the container or front tray. Dents in the roller housing prevent the internal spring from expanding correctly.

  2. Use the stabilizer bar properly: Let it rest on the rear door of the container. The roller should never rest directly on the container.

  3. Wind in the correct direction: Winding the roller backward will damage the spring.

  4. Do not overtension: Pioneer recommends 7 rotations to preload tension at the front of the truck. Overtightening will cause the spring to bind on the internal shaft. Avoid servicing the roller from the back of the truck.

  5. Do not release tension abruptly: Never “pull the bolt out” to let the spring unwind at once; this overstresses the spring and anchor tabs.

  6. Avoid overhanging arms: Letting arms extend past the back can cause bouncing and twisting, which can bend or warp the roller shaft.

  Warranty:

  • The roller assembly has a one-year warranty.

  • Warranty is voided if the roller is improperly installed or wound.

  • Internal spring replacement is possible using H7008A replacement torsion spring, though it is difficult to replace.