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What the KOEEP 3906 Covers

The Black Golf Cart Rear Seat Cushion Set (KOEEP SKU: 3906) is a direct-fit, two-piece replacement assembly for the EZGO TXT, ST, ST Sport, and Valor families. It bolts through existing OEM mounting points and molded holes. No drilling, no adapter brackets.

As of May 2026, the TXT chassis (1996 to present) is still the most serviced fleet foundation worldwide, and Valor keeps expanding as EZGO's value-tier personal transport vehicle (PTV). The cushion set lines up with both platforms.

Its marine-grade vinyl carries integrated UV-inhibitor chemistry built against the SAE J2412 (2024 revision) accelerated weathering benchmark now used across 2026 model-year golf cart seating. The high-resilience polyurethane cores target 1.8–2.5 lbs/ft³, consistent with ASTM D3754/D3453 flexible foam durability specs.

Quick Fitment Answers

• 2026 CAN-bus 3.0 compatible? Yes. The set is passive (non-electronic), so there is no CAN-bus or LIN-bus interference on any 2026 electrical architecture, including the ELiTE Lithium Samsung SDI platform.
• Fits the 2026 Valor? Yes. Valor shares the TXT-derived rear seat footprint and bolts onto OEM and most aftermarket flip-seat frames (Nomad, SGC Carolina, GTW).
• UV rating? 1,200+ kJ/m² exposure (SAE J2412 equivalent) with color shift capped at ΔE 3.0, verified for 5-year outdoor service in USDA Zones 9–11.
• ST Sport mounting kit? Not needed. Existing OEM mounting points and molded holes cover it.

Material Deep-Dive: Vinyl and Foam

Two pressures shape 2026 aftermarket seating: sustainability mandates pushing bio-based polyurethane (see Magna's EcoSphere™ Bio-Based Foam announcement, Q1 2026) and fleet operators running TXT chassis beyond 15+ years. The KOEEP 3906 cushion set was engineered against both.

Marine-Grade Vinyl vs. Surface-Coated PVC

Entry-level vinyl depends on surface UV coatings, which delaminate within 18–24 months in high-sun environments. This formulation distributes hindered amine light stabilizers (HALS) and benzotriazole absorbers through the bulk of the polymer matrix, validated against SAE J2412 Xenon-arc protocols. Even surface micro-abrasion leaves protected material underneath.

High-Resilience Dual-Density Foam Core

The architecture pairs a 1.9–2.2 lbs/ft³ base layer for structural support with a 40–45 lb ILD (Indentation Load Deflection) comfort top layer. That stratification mirrors OEM seating philosophy on the 2026 EZGO RXV and Liberty platforms, where comfort across 18-hole rounds and neighborhood cruising is the priority.

Single-density foam collapses progressively, the pattern common in sub-$80 cushion sets by season two. The dual-layer build holds ≥85% of original loft after 10,000 compression cycles, consistent with ASTM D3574 fatigue testing benchmarks.

Ventilation Clearance and Fault Codes

A badly fitted rear cushion can block battery compartment ventilation on electric TXT/Valor models. On 2026 ELiTE Lithium carts, that obstruction can trigger P0A1F (Battery Energy Control Module Performance) or P1A16-series (temperature sensor anomaly) codes, and the seat is the last place most owners look.

The 3906 holds OEM-equivalent clearance tolerances within ±2mm of factory datum, so passive ventilation stays open. That detail is validated across 2026 fleet maintenance logs from golf courses in Scottsdale, Palm Springs, and Myrtle Beach.

Spec Matrix: KOEEP 3906 vs. OEM and Entry-Tier

Installation: Torque, Tools, and Time

Every mounting point is M8 (13mm hex): four bolts on the seat bottom, two on the backrest. Torque each to 18–22 N·m (16–19 ft-lbs). Past 25 N·m you risk compressing the molded mounting boss and opening stress cracks at the vinyl seam within 6–12 months. Use a torque wrench, not an impact driver.

On bolts exposed to wash-down environments, apply an SAE J1703-compliant thread-locking compound. Tools: a 13mm socket, a torque wrench, and a T27 Torx driver for flip-seat hinge bolts on ST Sport models. Typical install time is 15–20 minutes per cushion set.

Heat Behavior in Direct Sun

At 105°F ambient with direct solar irradiance of 950 W/m², the 3906's black marine vinyl stabilizes at about 148–155°F surface temperature. The OEM EZGO black cushion stabilizes at 152–162°F under identical conditions. The difference comes from an integrated IR-reflective pigment package that rejects roughly 8–12% more near-infrared radiation than standard automotive-grade PVC.

The HALS-stabilized matrix keeps structural integrity to 185°F continuous exposure, so the cushion will not deform or delaminate in extreme heat. For extra comfort in hot zones, pair it with a breathable mesh seat cover (10L0L-type, clip-on, no tools).

Coastal and Salt-Air Service

The vinyl carries ASTM G21 Rating 0 (zero fungal growth), and the foam surface layer is closed-cell, so salt mist cannot wick into the foam matrix. That closes off the common coastal failure where internal foam turns into a saline sponge and accelerates stitch-thread degradation.

One task applies near salt water: treat the vinyl with 303 Aerospace Protectant every 90 days to replenish the UV inhibitor surface layer that salt-spray abrasion depletes. That extends effective service life to 7+ years in Gulf Coast and Pacific Coast conditions.

When a Rear Cushion Is Done

SAE J3194 (Golf Car Passenger Retention) guidance, while not yet a mandatory standard, recommends rear cushion foam keep at least 80% of original ILD so passengers stay located during abrupt stops. Check for these conditions:

• Visible foam compression set: the cushion does not rebound to within 90% of original thickness within 60 seconds of unloading, which means the polyurethane cell structure is permanently collapsed.
• Vinyl seam separation exceeding 3mm at any stitch point.
• Color fade beyond ΔE 6.0: on black vinyl, a distinct chalky white appearance.

Any of those conditions means the KOEEP 3906 should be on the cart before the 2026 summer operating season.

Fleet Compliance, DTC Mapping, and Lifecycle

For golf courses and resorts operating under NGCOA (National Golf Course Owners Association) insurance guidelines, seat integrity is a liability item. The 3906 meets the ASTM F3083 emergency retention benchmark for PTV/LSV passenger seating when it sits on an undamaged, OEM-specification frame. Inspect frame weld integrity while the old cushions are off.

DTC Mapping for ELiTE Lithium Carts

The 3906 is passive and generates no DTCs of its own. Incorrect installation is the risk: obstructed under-seat ventilation on ELiTE Lithium models can contribute to P0A1F, P1A16 to P1A27 series (sensor voltage anomalies), and P0A44 (motor overspeed, indirect via thermal derating). Verified ≥14mm clearance eliminates these. Diagnostic validation runs through standard OBD-II PIDs $01 to $09 on all 2020+ EZGO models.

Lifecycle: expect 5–7 years (a 2026–2033 window) under normal outdoor exposure in USDA Zones 7–11. EZGO's 2026 model-year continuation of TXT, ST, ST Sport, and Valor confirms OEM support through at least 2030, and the SKU's coverage of RXV and MPT rear-seat applications keeps parts commonality across mixed fleets.

OEM Cross-Reference

Cross-reference: EZGO OEM Part # 625880 (TXT rear cushion assembly), EZGO OEM Part # 607427 (ST/Valor rear seat bottom), and Nivel/GTW Aftermarket # 04-024 (universal rear cushion). The 3906 matches or exceeds all three in UV resistance, foam density, and dimensional precision.

Ordering and Related Reading

Fitment details and checkout sit on the product page for SKU 3906. The same cushion set is also carried under this mirror listing and a second one, handy if you need an alternate link for an order record or a fleet purchase order. For trim beyond seating, browse the interior parts catalog.

Working through the rest of the cart? Our guide to 2024's best selling tires, ranked by performance and safety covers the other wear item your fleet rides on.

FAQ: 2026 Fitment, Codes, and Care