Product Description
Hammer II GL Straight Tarp System, Part 1809574
The Hammer II GL Straight Tarp System, DeBrovys SKU 20-1809574 and Shur-Co part 1809574, is the documented ground-level manual-crank Hammer II configuration with straight arms and five flat-coil springs. It is intended for a confirmed compatible Hammer II installation on a box or trailer up to 23 feet. This is not an electric Hammer II configuration and is not interchangeable with the 30° bent-arm Hammer II GL system merely because the product family and spring count are similar.
The strongest ordering check is the installed system’s complete operating layout: confirm the existing part number, straight upper-arm geometry, five-spring pivot arrangement, manual-crank location, chain-guard arrangement, roller-bar path, rear crosspiece, tarp travel, body clearance, and mounting condition before releasing an order. Hammer II systems are configuration-specific equipment; a photograph, a broad “steel tarp arm” description, or a shared family name does not establish fitment.
Verified 1809574 Configuration
| Specification | Verified detail |
|---|---|
| Product | Hammer II GL System Straight |
| DeBrovys SKU | 20-1809574 |
| Manufacturer part number | 1809574 |
| System family | Shur-Co / Donovan Hammer II steel-arm tarp system |
| Arm geometry | Straight; official Hammer II literature identifies 1.69-inch OD, two-piece round arms in the system context |
| Drive / operation | Ground-level manual crank; no electric control assignment in the official 1809574 configuration matrix |
| Spring configuration | Flat coil — 5 |
| Documented coverage context | Compatible boxes and trailers up to 23 feet; verify actual body and complete system layout |
| Tarp scope | Tarps are sold separately; select a compatible tarp only after the installed system is confirmed |
Shur-Co’s published Hammer II matrix specifically lists part 1809574 as Hammer II GL, Straight, Ground Level, Flat Coil – 5, N/A electrics. The N/A designation matters: it distinguishes this manual-crank system from the separately documented electric Hammer II configurations.
Ground-Level Manual Crank Versus Electric Hammer II Systems
The GL designation identifies a ground-level manual-crank arrangement. The manufacturer describes the standard electric Hammer II as using a Durabuilt 12V direct-drive motor and rotary switch, while the GL model uses the manual crank. Do not order this straight GL configuration if the installed equipment is electric or uses an electric control package unless current manufacturer documentation and a qualified fitment review confirm the required conversion scope.
| Documented Hammer II configuration | Arm style | Operation | Selection rule |
|---|---|---|---|
| 1809574 — Hammer II GL | Straight | Ground-level manual crank; flat coil – 5 | Choose only for a confirmed straight manual-crank Hammer II GL system. |
| 1809578 — Hammer II GL 30° | 30° bend | Ground-level manual crank; flat coil – 5 | Do not substitute for a straight assembly. See the Hammer II GL 30 Degree Bend only when the installed arms confirm the 30° geometry. |
| 1809555 — Hammer II | Straight | Electric; rotary switch; flat coil – 5 | Different control and drive configuration. See the electric Hammer II Straight System for reference, not interchangeability. |
| 1809556 — Hammer II 30° | 30° bend | Electric; rotary switch; flat coil – 5 | Different arm geometry and electric configuration; confirm before selecting any related part. |
Hammer II System Scope
Official Hammer II literature identifies a tarp spool with side plates, extruded aluminum roller bar, two-piece round arms, flat-coil springs, and available accessories within the broader system context. Those references help identify the operating assembly, but they do not replace a current packing-list review. Confirm the exact order contents, tarp selection, optional equipment, mounting hardware, and installation requirements before service begins.
For related product families, controls, replacement components, and system-planning resources, browse Truck Tarp Systems. The Hammer II GL straight configuration should be evaluated as a complete operating layout rather than as a generic combination of an arm, roller, crank, and cover.
Straight-Arm Fitment Checklist
| Confirm before ordering | Why it matters |
|---|---|
| Existing part number | Part 1809574 is the documented starting point for a direct Hammer II GL straight-system decision. |
| Upper-arm geometry | The GL straight kit must match a straight installed configuration, not a 30° bent assembly. |
| Manual-crank operation | Confirm the ground-level manual-crank and chain-guard arrangement rather than an electric motor and switch setup. |
| Five flat-coil spring arrangement | Spring count, pivot hardware, arm sections, and mounting locations must agree with the installed Hammer II system. |
| Body and travel clearance | Check cab shields, body sides, tailgate hardware, lights, toolboxes, exhaust, accessories, tarp path, and rear crosspiece through the full travel range. |
| System condition | Damaged pivots, loose hardware, corrosion, bent arms, worn springs, roller misalignment, or tarp damage can affect safe operation and component life. |
For a fitment review, provide DeBrovys with the installed part number, photographs of both arm assemblies and pivot areas, the manual-crank and chain-guard area, roller-bar path, rear crosspiece, body dimensions, and a concise repair history. Those records help distinguish the straight GL system from the 30° GL version or an electric Hammer II before an order is released.
Tarp Selection Is Separate From the System
The manufacturer states that the tarp must be selected separately when pricing a Hammer II system. A compatible tarp selection depends on the confirmed roller-bar arrangement, rear crosspiece, body dimensions, arm path, intended material, finish details, and operating environment. Do not assume a generic tarp, a tarp from a different arm family, or an existing cover will fit part 1809574 without confirming the full layout.
After the Hammer II GL configuration is confirmed, DeBrovys can help assess compatible material options, finished dimensions, attachment details, reinforcement needs, and related tarp hardware. For non-standard covers, provide measurements and photographs so any custom fabrication or heat-sealed panels, where applicable, are evaluated against the actual system rather than a broad product category.
Spring-Tension Safety and Qualified Service
Hammer II arms, pivots, flat-coil springs, and crank-related components are safety-critical service items. Do not release, remove, install, index, disassemble, or modify springs, pivots, arm sections, crank components, or mounting hardware without current manufacturer instructions, proper tools, qualified personnel, and a controlled work area. Keep people clear of arm-travel, pinch, and potential release zones during inspection, installation, and operation.
If an arm is bent, a pivot mount is cracked, spring components are damaged, hardware is missing, the crank or chain guard is compromised, or the tarp tracks incorrectly, remove the system from service until it is evaluated. Use current guidance for the installed Hammer II configuration; do not adapt procedures from a different arm system or an electric configuration.
Installation and Initial Commissioning
Before qualified installation, inspect mounting structure, pivot assemblies, arm sections, springs, manual crank, chain guard, roller bar, tarp attachment, rear crosspiece, hardware, and body-side structure. Confirm that the straight-arm travel path clears the cab, body, tailgate, accessories, and tarp components through the intended operating range.
After installation, operate the system slowly in a clear area and only according to current manufacturer instructions. Observe arm geometry, crank function, 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 and Fleet Consistency
Inspect the Hammer II GL system as an assembly: pivot mounts, springs, arms, crank and chain guard, roller bar, rear crosspiece, tarp attachment points, body-side hardware, and tarp condition. Watch for loose hardware, corrosion, cracking, deformation, worn pins, changes in spring response, damaged chain-guard components, or any condition that affects normal travel.
Expert fleet insight: record the truck or trailer number, part 1809574, installed arm geometry, operation type, inspection date, service work, and clear photographs. Fleets can accumulate mixed arm geometries, altered mounts, or prior repairs that make a product photo misleading. A consistent service record helps a technician determine whether the equipment is truly a straight, manual-crank 1809574 installation before a replacement decision is made.
Official Hammer II Catalog and Literature References
DeBrovys has identified official Shur-Co/Donovan literature that shows the Hammer II system, its documented ground-level manual-crank configuration, the 1809574 straight/flat-coil-five matrix entry, and the distinction from the 1809578 30° configuration. Vendor-source pages may be provided in the product gallery for system reference. No AI-generated technical image is used or proposed for this product.
For broader planning around truck tarp systems, service, and related components, review the DeBrovys guide to Donovan and Shur-Co tarp systems and the DeBrovys blog. These 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, installed configuration, current price, exact order contents, shipping requirements, and qualified installation plan.
Frequently Asked Questions
What is Shur-Co part 1809574?
Part 1809574 is the documented Hammer II GL straight configuration: straight 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 straight system electric?
No. The GL configuration uses a ground-level manual crank. Shur-Co documents separate electric Hammer II configurations with a Durabuilt motor and a rotary or rocker switch. Confirm the installed drive arrangement before ordering.
Is 1809574 interchangeable with the Hammer II GL 30° system?
No. The 1809574 is straight; the 1809578 is the documented 30° bent-arm Hammer II GL configuration. Match the installed arm geometry, pivots, springs, crank arrangement, and complete operating path.
Does the Hammer II GL system include a tarp?
Do not assume that it does. The manufacturer states that the tarp is selected separately. Confirm exact order contents and match any tarp to the verified roller bar, rear crosspiece, dimensions, and system layout.
What information is needed for a fitment review?
Provide the current part number, photos of both arms and pivots, the manual crank and chain guard, roller-bar and rear-crosspiece areas, body measurements, and repair history. This helps distinguish a direct 1809574 fit from a 30° or electric Hammer II configuration.
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.
