Product Description
Arm-Matic 4-Spring 12-Foot Bent Arm Kit, Part 1125317
The Arm/Spring Kit – 4-Spring – 12' Arms with 2' Bend, DeBrovys SKU 20-1125317 and Shur-Co part 1125317, is an Arm-Matic replacement arm-kit configuration for qualified truck-tarp service. Shur-Co’s replacement-arm guide identifies 1125317 as an Arm-Matic 30° bent, 12-foot, four-spring arm kit. It is intended to restore the correct arm-and-spring configuration on a compatible system—not to serve as a universal replacement for every pivot-arm tarp system.
Before ordering, match the actual installed system, pivot-mount style, arm length, bend geometry, spring arrangement, body width, tarp path, cross-tube arrangement, and mounting hardware. Do not select the 12-foot version simply because a longer arm appears desirable. The existing part number, clear photos of both arm pivots and the rear crossover, finished body measurements, and the system model are the right starting points for a fitment review.
Verified Product Configuration
| Specification | Verified detail |
|---|---|
| Product name | Arm/Spring Kit – 4-Spring – 12' Arms with 2' Bend |
| DeBrovys SKU | 20-1125317 |
| Manufacturer part number | 1125317 |
| Product family | Shur-Co / Donovan Arm-Matic replacement arm kit |
| Arm configuration | 30° bent arm, 12-foot, four-spring configuration |
| Arm description in construction catalog | Arm/4-Spring Kit – 12' Arms with 2' Bend |
| Recommended application types in manufacturer arm-kit guide | Dump bodies, end dumps, belly dumps, and pup trailers |
| Store category | Truck Tarp Systems / Donovan Enterprises Inc. |
This kit is identified by its configuration as well as its part number. A 10-foot kit, an underbody kit, a straight-arm kit, a different-bend arm, or a five-spring assembly may look related but can have different geometry and hardware requirements. If the existing part number is not visible, measure and photograph the full system before selecting a replacement.
What the 12-Foot Arm-Matic Kit Is Designed For
Shur-Co describes the Arm-Matic family as a durable, serviceable tarp-system solution for dump bodies and belly dumps. The manufacturer’s replacement-arm guide recommends the Arm-Matic replacement-arm family for dump bodies, end dumps, belly dumps, and pup trailers. Part 1125317 is the 12-foot bent, four-spring configuration within that family. It should be selected only when the existing equipment and real operating path match the part’s geometry.
For fleet service, a compatible 12-foot kit can be the correct repair when an existing Arm-Matic 12-foot, four-spring, bent-arm assembly has damage, wear, corrosion, collision damage, or failed components. It is not a substitute for diagnosing why the prior arm assembly failed. Inspect pivots, mounts, crossover, tarp roller, tarp tension, body rails, and any evidence of interference before fitting new components. Correcting the root cause protects the replacement kit from the same failure cycle.
Replacement Kit Components and Configuration Control
Shur-Co’s replacement-arm guide states that replacement arm kits include pivot mounts, flat coil springs, a welded or clamshell lower arm section, pivot arms, an elbow when applicable, rear crossover, and hardware. The guide lists 1125317 in its Arm-Matic arm-kit group. Confirm the exact as-shipped contents against the order, delivery paperwork, and current manufacturer documentation before installation, particularly on equipment that has been modified, repaired with mixed components, or transferred between bodies.
The Arm-Matic product family uses one-piece anodized aluminum arms and a cast-aluminum spring housing as family features. The 1125317 configuration is a bent, four-spring kit. Do not mix components from a different arm series, length, mount style, or spring count on the basis of visual similarity. Correct system geometry lets the arms, tarp, roller, and rear crossover travel together as intended.
Compatibility Checklist Before Ordering
| Confirm before ordering | Why it matters |
|---|---|
| Existing manufacturer part number | Part 1125317 is the strongest starting point for an exact 12-foot Arm-Matic replacement decision. |
| Arm type, length, and bend | This listing is a 30° bent, 12-foot, four-spring configuration; 10-foot, underbody, straight, or different-bend configurations are not interchangeable by appearance. |
| Spring count and mount style | Four-spring components, pivot mounts, and spring housings must match the compatible system design. |
| Vehicle and body application | Confirm whether the equipment is a dump body, end dump, belly dump, or pup trailer and document finished body dimensions. |
| Arm path and rear crossover | Arms, elbow, cross tube, tarp, and body hardware must move without contact, binding, or excessive tension. |
| Current system condition | Bent mounts, worn pivots, damaged crossovers, loose hardware, damaged tarps, or misaligned rollers can shorten the life of a new kit. |
| Qualified service plan | Spring-loaded arms require trained service personnel, manufacturer instructions, appropriate tools, and a controlled work area. |
For a fitment review, send DeBrovys the original part number, photos of both arm assemblies, a photo of the rear crossover, body width and length, and details about any previous repair. This separates a direct 1125317 replacement from a system change that requires a different arm, spring, pivot, rear crossover, or tarp configuration.
Spring-Tension Safety: Qualified Service Required
Arm assemblies are under spring tension while the springs are engaged. Shur-Co’s Arm-Matic manual directs users to use caution while assembling or disassembling arms. This is a safety-critical component group. Do not release, remove, index, disassemble, or modify spring-loaded components without the current manufacturer instructions, suitable tools, trained service personnel, and a secured work area.
Keep people clear of the arm path and all potential pinch or release areas during inspection and service. If an arm is bent, a spring appears damaged, a pivot has excessive play, hardware is missing, or the tarp tracks incorrectly, take the system out of service until it can be evaluated. Do not use a damaged arm kit as a temporary fix, and do not substitute miscellaneous hardware for specified pivot or spring components.
Pre-Installation Inspection and First-Cycle Commissioning
A replacement kit should be installed only after the surrounding tarp system has been inspected. Check the mounting structure, pivot locations, lower arm sections, elbow and rear crossover, tarp roller, tarp attachment, motor or crank arrangement, wiring or controls where applicable, and body-side clearance. Confirm that lights, cab guards, toolboxes, fenders, exhaust components, and body hardware will not interfere with the designed arm path.
After qualified installation, inspect all hardware for complete assembly before operation—the Arm-Matic manual specifically emphasizes this initial inspection. Complete the first cycle slowly in a clear area while observing arm motion, tarp tracking, cross-tube position, tension, and clearance. Stop the system if an arm binds, the tarp pulls unevenly, a pivot contacts the body, or any component behaves unexpectedly.
Maintenance and Fleet Recordkeeping
Replacement arms last longer when the tarp system is maintained as one working assembly. Include arm pivots, springs, mounting hardware, lower arms, elbows, rear crossover, tarp roller, tarp attachment points, and the tarp itself in the fleet inspection routine. Look for abrasion, loose fasteners, corrosion, cracks, deformation, damaged coatings, reduced spring performance, and any condition that changes normal tarp travel.
Record installed part number 1125317, truck or trailer number, body style, installation date, service observations, and photographs in the equipment file. Reliable records help service teams determine whether a future request is the same 12-foot configuration or a different body, tarp, arm, or pivot setup. They can also reveal recurring damage patterns rather than encouraging repeated replacement of only the visible failed component.
12-Foot Kit vs. 10-Foot and Underbody Alternatives
Arm kits are not all interchangeable. Shur-Co’s Arm-Matic replacement guide distinguishes the 10-foot, 12-foot, four-spring, and underbody configurations. The 10-foot Arm-Matic kit is a separate part, 1125316 with 10-foot arms and a 2-foot bend; it should not be substituted for 1125317 based only on a broad “four-spring arm kit” label. Likewise, the underbody 12-foot option is a distinct configuration.
Use the installed manufacturer part number, current arm length, bend geometry, spring arrangement, pivot mounts, rear crossover, body application, and tarp system as the selection standard. A longer arm does not automatically make a system better or compatible; it can create a clearance or tension problem if the rest of the assembly does not match.
Truck Tarp System Parts and Resources
Browse Truck Tarp Systems for complete systems, controls, replacement parts, and related components. For broader product-family context, read the DeBrovys guide to Donovan and Shur-Co tarp systems and visit the DeBrovys blog.
If the repair also needs a replacement tarp, provide tarp material, finished dimensions, roller and cross-tube details, and the arm configuration. DeBrovys can help identify related parts, replacement-tarp options, and custom fabrication or heat-sealed panels for compatible tarp applications. Tarp work does not replace the need to verify the arm-and-spring kit against the existing system.
Minimum Order Fee Notice
Orders below $130.00 are subject to a $25.00 SHUR-CO minimum order fee. If an order total is $130 or below, DeBrovys will contact the buyer with an additional invoice for the fee before shipment. For any replacement-arm order, verify the exact part number, current pricing, shipping needs, compatibility, installation plan, and all associated components before purchase.
Frequently Asked Questions
What is Shur-Co part 1125317?
Part 1125317 is an Arm-Matic replacement arm-kit configuration identified by Shur-Co as a 30° bent, 12-foot, four-spring arm kit. The DeBrovys SKU is 20-1125317, and the construction catalog describes it as a four-spring kit with 12-foot arms and a 2-foot bend.
Is this the same as the 10-foot Arm-Matic arm kit?
No. The 10-foot four-spring bent-arm kit is part 1125316, while this 12-foot kit is part 1125317. Confirm the existing arm length, part number, spring arrangement, pivots, rear crossover, and system geometry before ordering.
What equipment is the Arm-Matic replacement-arm family recommended for?
Shur-Co’s replacement-arm guide recommends the Arm-Matic family for dump bodies, end dumps, belly dumps, and pup trailers. Confirm the exact arm, pivot, spring, rear-crossover, and tarp-system configuration before ordering this specific part.
What is included with a replacement arm kit?
The manufacturer guide states that replacement arm kits include pivot mounts, flat coil springs, a welded or clamshell lower arm section, pivot arms, an elbow when applicable, rear crossover, and hardware. Verify the exact as-shipped contents for part 1125317 against current order documentation before installation.
Can I install or service the springs myself?
Spring-loaded arms are under tension while the springs are engaged. Shur-Co instructs users to use caution during assembly and disassembly. Installation and service should be completed by qualified personnel using current manufacturer instructions, suitable tools, and a controlled work area.
