Product Description
Hammer II GL 30° Bend Tarp System, Part 1809578
The Hammer II GL 30° Bend Tarp System, DeBrovys SKU 20-1809578 and Shur-Co part 1809578, is the documented Hammer II configuration with 30-degree bent arms, ground-level manual-crank operation, and five flat-coil springs. It is designed for a confirmed compatible Hammer II installation on a box or trailer up to 23 feet. The 30° arm shape, manual-crank layout, spring arrangement, roller-bar path, rear crosspiece, and pivot locations must match the equipment on hand before an order is released.
Part 1809578 is not simply a generic “bent tarp arm” or a straight Hammer II system with a different arm angle. Shur-Co identifies it separately from the straight ground-level 1809574 and from electric 30° Hammer II systems. The correct selection starts with the installed configuration—not a broad family name, a single product photo, or an assumption based only on box length.
Verified 1809578 Configuration
| Specification | Verified detail |
|---|---|
| Product | Hammer II GL System 30 Degree Bend |
| DeBrovys SKU | 20-1809578 |
| Manufacturer part number | 1809578 |
| System family | Shur-Co / Donovan Hammer II steel-arm tarp system |
| Arm geometry | 30° bend; match the installed 30° arm layout rather than a straight-arm configuration |
| Drive / operation | Ground-level manual crank |
| Spring configuration | Flat coil — 5 |
| Electrics | N/A in the official 1809578 configuration matrix |
| Documented coverage context | Compatible boxes and trailers up to 23 feet; actual body and full system layout must be verified |
| Tarp scope | Tarps are sold separately; select only after confirming the complete system |
The official Hammer II catalog matrix identifies 1809578 as Hammer II 30°, 30° Bend, Ground Level, Flat Coil – 5, N/A. The ground-level and N/A-electric details are critical: they distinguish this manual-crank system from separately documented electric Hammer II configurations.
Why the 30° Arm Geometry Matters
The 30° bend is a physical arm-geometry requirement, not a cosmetic preference or a shortcut for a body-clearance problem. It affects how the arms sit at rest, travel over the box, meet the pivot and spring assemblies, align with the roller bar and rear crosspiece, and clear the cab, body hardware, lights, toolboxes, tarps, and accessories. Do not substitute a straight-arm kit when the installed system confirms a 30° bend, and do not try to alter arm geometry in the field to make a different configuration fit.
A useful fitment record includes a clear side photo of each arm at rest, photos of both pivots and spring assemblies, the manual-crank and chain-guard area, roller-bar path, rear-crosspiece location, cab/body clearance, body length, and any earlier repair records. That documentation helps a technician distinguish the exact 30° GL layout from a straight or electric Hammer II configuration before parts are selected.
Manual Ground-Level Operation Versus Electric Hammer II
The GL designation identifies the ground-level manual-crank arrangement. Shur-Co describes separate Hammer II configurations with Durabuilt 12V motors and rotary or rocker switches. Those electric components should not be represented as standard features of the 1809578 GL system. Confirm whether the existing system is operated through the manual crank and protected chain-guard arrangement, rather than through a motor, solenoid, or in-cab switch.
| Documented Hammer II configuration | Arm style | Operation | Selection guidance |
|---|---|---|---|
| 1809578 — Hammer II GL 30° | 30° bend | Ground-level manual crank; flat coil – 5 | Select only for a confirmed 30° manual-crank Hammer II GL system. |
| 1809574 — Hammer II GL | Straight | Ground-level manual crank; flat coil – 5 | Different arm shape. Review the Hammer II GL Straight System only if the installed arms are straight. |
| 1809556 — Hammer II 30° | 30° bend | Electric; rotary switch; flat coil – 5 | Same general bend category but a different drive and control layout. See the electric Hammer II 30 Degree Bend System for reference, not interchangeability. |
| 1809555 — Hammer II | Straight | Electric; rotary switch; flat coil – 5 | Different arm geometry and different electric operating configuration. |
Hammer II System Scope and Order Contents
Official Hammer II literature describes the broader system context, including a tarp spool with side plates, extruded aluminum roller-bar components, round-arm assembly, flat-coil springs, manual crank equipment, and available accessories. These references help identify the operating layout, but they do not replace a current packing-list or fitment review. Confirm exact order contents, mounting requirements, arm components, tarp selection, optional accessories, and qualified installation requirements before service begins.
For related product families, controls, replacement components, and service-planning resources, browse Truck Tarp Systems. The 1809578 system must be evaluated as a complete 30° manual-crank configuration rather than as unrelated components assembled from similar-looking systems.
30° Bent-Arm Fitment Checklist
| Confirm before ordering | Why it matters |
|---|---|
| Existing part number | 1809578 is the documented starting point for the Hammer II GL 30° configuration decision. |
| 30° upper-arm shape | Verify the installed bent arm geometry on both sides; do not substitute a straight-arm arrangement. |
| Ground-level manual crank | Confirm the crank-box and chain-guard arrangement rather than an electric motor, solenoid, rotary switch, or rocker switch system. |
| Five flat-coil springs | Spring configuration, pivots, arms, and mounting locations must agree with the installed Hammer II system. |
| Body and travel clearance | Check cab shields, body sides, tailgate hardware, lights, exhaust, toolboxes, accessories, roller-bar path, tarp path, and rear crosspiece throughout travel. |
| Current condition | Loose hardware, corrosion, cracked mounts, bent arms, worn pivots, damaged springs, crank issues, or tarp-tracking problems may affect safe operation. |
Verify both left- and right-side arm layouts and document the vehicle or trailer number. A 30° shape on one image can be misleading if the equipment has been modified, repaired, installed on a different body, or mixed with components from another system family. Exact photographs and the current manufacturer instructions are stronger evidence than a generic product description.
Tarp Selection Is Separate
The manufacturer’s Hammer II catalog states that tarps are sold separately. A compatible tarp must be matched to the confirmed roller-bar arrangement, rear crosspiece, body dimensions, 30° arm travel, attachment details, material needs, and operating environment. Do not assume a generic dump-truck tarp, a tarp from a straight-arm system, or an existing cover fits part 1809578 without confirming the complete layout.
Once the 1809578 configuration is verified, DeBrovys can help assess tarp material, finished dimensions, attachment details, reinforcement needs, and related hardware. For non-standard covers, provide accurate measurements and photographs so any custom fabrication or heat-sealed panels, where applicable, are evaluated for the real system rather than a broad product category.
Spring-Tension Safety and Qualified Service
Hammer II arms, pivots, flat-coil springs, crank components, and mounting hardware are safety-critical items. Do not release, remove, install, index, disassemble, or modify springs, pivots, arm sections, crank equipment, or body mounting hardware without current manufacturer instructions, proper tools, qualified personnel, and a controlled work area. Keep people clear of potential arm-travel, pinch, and release zones during inspection and operation.
Remove the system from service for qualified evaluation if an arm is bent, a pivot mount is cracked, hardware is missing, a spring component is damaged, the manual crank or chain guard is compromised, the tarp tracks incorrectly, or the arms move unexpectedly. Do not adapt procedures from a straight-arm or electric configuration merely because it shares the Hammer II name.
Installation and Initial Commissioning
Before qualified installation, inspect the mounting structure, pivot assemblies, 30° arm sections, flat-coil springs, manual crank, chain guard, roller bar, rear crosspiece, tarp attachment, hardware, and body-side structure. Confirm that the bent-arm path clears the cab, body, tailgate, accessories, and cover components through the intended operating range.
After installation, operate the system slowly in a clear area and only according to current manufacturer instructions. Observe crank function, arm geometry, tarp tracking, roller-bar movement, rear-crosspiece operation, fasteners, and body clearance. Stop service if the arms bind, rub, contact the body, pull the tarp unevenly, or move unexpectedly.
Maintenance Records for Mixed Fleets
Inspect the system as an assembly: pivot mounts, springs, 30° arms, crank and chain guard, roller bar, rear crosspiece, tarp attachment points, body-side hardware, and tarp condition. Record loose hardware, corrosion, cracking, deformation, worn pins, unusual spring response, damaged guard components, or any condition that affects normal travel.
Expert fleet insight: record the truck or trailer number, 1809578 identification, confirmed 30° arm geometry, manual-operation type, inspection date, service work, and clear photographs. Mixed fleets can accumulate straight and bent systems, manual and electric controls, or repaired assemblies that look similar at a glance. A documented record reduces the chance of ordering a mechanically plausible but incorrect configuration.
Official Hammer II Catalog and Literature References
DeBrovys has identified official Shur-Co/Donovan literature that documents the Hammer II GL 30° configuration, the 1809578 ground-level/30°/flat-coil-five matrix entry, manual crank-box context, and the distinction from straight and electric versions. Vendor-source literature may be presented in the product gallery as a reference. No AI-generated technical image is used or proposed for this product.
For broader planning around truck tarp systems, parts, and service, review the DeBrovys guide to Donovan and Shur-Co tarp systems and the DeBrovys blog. Those resources support planning; they do not replace the current installation instructions for the equipment on hand.
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. Before purchasing, confirm the part number, 30° manual-crank configuration, current price, exact order contents, shipping requirements, and qualified installation plan.
Frequently Asked Questions
What is Shur-Co part 1809578?
Part 1809578 is the documented Hammer II GL 30° configuration: 30° bent arms, ground-level manual-crank operation, five flat-coil springs, and no electric control assignment in the manufacturer’s configuration matrix.
Is the Hammer II GL 30° system electric?
No. The GL configuration uses a ground-level manual crank. Shur-Co documents separate electric Hammer II systems with a Durabuilt motor and rotary or rocker switch. Confirm the installed drive arrangement before ordering.
Is 1809578 interchangeable with the straight Hammer II GL system?
No. Part 1809578 is a 30° bent-arm configuration; 1809574 is the straight ground-level Hammer II GL configuration. Match the installed arms, pivots, springs, crank arrangement, and full travel path.
Does the Hammer II GL 30° system include a tarp?
Do not assume that it does. The manufacturer states that tarps are sold separately. Confirm exact order contents and match any tarp to the verified roller bar, rear crosspiece, dimensions, and 30° system layout.
What is needed for a 30° fitment review?
Provide the current part number, side photos of both 30° arms and pivots, manual crank and chain-guard photos, roller-bar and rear-crosspiece areas, body measurements, and service history. This helps distinguish the correct 1809578 configuration from straight or electric alternatives.
Can flat-coil spring components be serviced without trained personnel?
No. Spring-loaded components require current manufacturer instructions, proper tools, qualified service personnel, and a controlled work area. Stop service if components are damaged, bind, or operate unexpectedly.
