Product Description
Arm-Matic 4-Spring 10-Foot Bent Arm Kit, Part 1125316
The Arm/Spring Kit – 4-Spring – 10' Arms with 2' Bend, DeBrovys SKU 20-1125316 and Shur-Co part 1125316, is an Arm-Matic replacement arm-kit configuration for qualified truck-tarp service. Shur-Co’s replacement-arm guide identifies 1125316 as an Arm-Matic 30° bent, 10-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 all mounting hardware. A product name or a photograph alone is not enough to confirm interchangeability. The safest replacement decision begins with the existing part number, clear photos of both arm pivots and the rear crossover, finished body measurements, and the operating system model.
Verified Product Configuration
| Specification | Verified detail |
|---|---|
| Product name | Arm/Spring Kit – 4-Spring – 10' Arms with 2' Bend |
| DeBrovys SKU | 20-1125316 |
| Manufacturer part number | 1125316 |
| Product family | Shur-Co / Donovan Arm-Matic replacement arm kit |
| Arm configuration | 30° bent arm, 10-foot, four-spring configuration |
| Arm description in construction catalog | Arm/4-Spring Kit – 10' 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. Do not replace a straight-arm, underbody, different-length, different-bend, five-spring, or non-Arm-Matic assembly merely because the overall system appears similar. If the existing part number is unavailable, measure and photograph the complete system before selecting a replacement.
What the Arm-Matic Replacement Kit Is Designed For
Shur-Co describes the Arm-Matic family as a tarp-system solution for dump bodies and belly dumps, with durable operation and ease-of-repair as core considerations. The manufacturer’s replacement-arm guide recommends the Arm-Matic replacement-arm family for dump bodies, end dumps, belly dumps, and pup trailers. That recommendation gives the application context for part 1125316, but every installation must still be confirmed against the truck, body, tarp system, arm geometry, and hardware actually in service.
For a fleet, this kit can be the appropriate service choice when a compatible Arm-Matic 10-foot, four-spring, bent-arm assembly needs replacement because of wear, damage, corrosion, collision, or a failed component. It is not a shortcut around diagnosing why an arm failed. Before a new kit is installed, inspect the pivots, mounts, cross tube, tarp roller, motor or crank system, tarp tension, body rails, and any evidence of interference. Replacing arms without addressing the cause of abnormal wear can lead to repeat damage.
Replacement Kit Components and Configuration Control
Shur-Co’s replacement-arm guide explains 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 1125316 in its Arm-Matic arm-kit group. Confirm the exact as-shipped contents against the order, delivery paperwork, and current manufacturer documentation before installation, especially when replacing a system that has been modified in the field.
The Arm-Matic product family uses one-piece anodized aluminum arms and a cast-aluminum spring housing as family features. The 1125316 configuration is a bent, four-spring arm kit. Components from another arm series or spring count should not be mixed into the installation based only on visual similarity. Preserve the complete, compatible system geometry so 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 1125316 is the strongest starting point for an exact Arm-Matic replacement decision. |
| Arm type and bend | This listing is a 30° bent, 10-foot, four-spring configuration; straight, underbody, or different-bend arms 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 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, correct tools, and a controlled work area. |
Send DeBrovys the original part number, photos of both sides of the arm assembly, a photo of the rear crossover, body width and length, and any details about prior repairs. This information can distinguish a direct replacement from a system change that needs a different arm, spring, pivot, or tarp configuration.
Spring-Tension Safety: Service by Qualified Personnel
Arm assemblies are under spring tension while the springs are engaged. Shur-Co’s Arm-Matic manual specifically directs users to use caution while assembling or disassembling arms. This is a safety-critical component group. Do not attempt to release, remove, index, disassemble, or modify spring-loaded arm components without the current manufacturer instructions, appropriate 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 Commissioning
A replacement kit should be installed only after the surrounding tarp system has been inspected. Check 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 the truck body is sound and that no lights, cab guards, toolboxes, fenders, exhaust components, or body hardware interfere with the designed arm path.
After qualified installation, inspect all hardware for complete assembly before operating—the manufacturer’s Arm-Matic guidance emphasizes this initial inspection. The first operating cycle should be completed slowly in a clear area while the technician observes arm motion, tarp tracking, cross-tube position, tension, and clearance. Stop operation if an arm binds, the tarp pulls unevenly, a pivot contacts the body, or any component behaves unexpectedly.
Maintaining a Replacement Arm System
Replacement arms last longer when the entire tarp system is treated 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, loosened fasteners, corrosion, cracks, deformation, damaged coatings, reduced spring performance, and anything that changes the normal tarp path.
Record the installed part number 1125316, truck or trailer number, body style, installation date, photos, and service observations in the equipment file. That record helps a fleet determine whether a later part request is the same configuration or a change in body, tarp, arm, or pivot setup. Accurate records also help service teams identify recurring damage patterns rather than repeatedly replacing the visible failed component alone.
Arm-Matic Compared with Other Arm Configurations
Arm kits are not all interchangeable. The Arm-Matic guide distinguishes 10-foot, 12-foot, four-spring, underbody, bent-arm, and other configurations. A different system may use a different arm length, spring count, mount, elbow, crossover, or body application. Selecting by price, color, or a broad description such as “four-spring arm kit” can create a clearance or tension problem after installation.
DeBrovys also lists an RR Interchangeable 4-Spring Arm Kit. It is a separate product and must not be assumed compatible with this Arm-Matic kit. Use part number 1125316 and the documented Arm-Matic configuration as the starting point for this replacement. If the existing system differs, request fitment guidance before placing an order.
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 requires a replacement tarp, provide the tarp material, finished dimensions, roller and cross-tube details, and arm configuration. DeBrovys can help identify related parts, replacement-tarp options, and custom fabrication or heat-sealed panels for compatible tarp applications. Tarp work, however, does not replace the need to verify that the arm-and-spring kit is correct for 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 required associated components before purchase.
Frequently Asked Questions
What is Shur-Co part 1125316?
Part 1125316 is an Arm-Matic replacement arm-kit configuration identified by Shur-Co as a 30° bent, 10-foot, four-spring arm kit. The DeBrovys SKU is 20-1125316, and the catalog describes it as a four-spring kit with 10-foot arms and a 2-foot bend.
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 1125316 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.
How do I confirm this is the right replacement kit?
Start with the existing manufacturer part number. Then verify the Arm-Matic family, 10-foot bent-arm geometry, four-spring arrangement, pivot mounts, rear crossover, body application, and surrounding tarp system. Send DeBrovys photos and measurements if any detail is uncertain.
