12V Alternator A187873 for CASE 4391 4390 6590 6591T Engine 170C 220B 480E 580E 590L 584E 585E 2096 4000 5000 5120

Product Specifications

Compatible Models

Tired of Alternator Failures on Your CASE Excavator or Backhoe? Get the OEM-Equivalent A187873 Alternator — Tested & Ready to Ship

Every unplanned downtime hour on a CASE 170C excavator or 580E backhoe loader costs hundreds — sometimes thousands — in lost productivity, labor, and contract penalties. Counterfeit alternators fail within weeks, causing voltage spikes that damage ECUs and sensors. OEM replacements take 2–4 weeks to arrive, halting your entire fleet maintenance schedule. And sourcing reliable parts for multiple CASE models — from 4391 engines to 590L loaders — across different suppliers wastes time and increases error risk.

OEM-Equivalent Quality, Rigorously Tested Before Shipment

This 12V alternator A187873 is manufactured exclusively in ISO 9001-certified factories and undergoes full-load performance testing at 12V/100A output before dispatch — matching original CASE specifications for regulated voltage (13.8–14.4V), ripple voltage (<200mV), and thermal stability up to 105°C. With 10 years of global export experience and 10,000+ CASE-compatible SKUs in stock, XUNPO delivers precision-engineered electrical components trusted by repair centers maintaining high-utilization CASE fleets across North America, Africa, and Southeast Asia.

Where This Part Works

The A187873 alternator powers critical systems on CASE machines operating in demanding environments: earthmoving on mining sites, continuous loading at ports, trenching in wet soil, and demolition work under dust and vibration. In these conditions, consistent charging ensures stable hydraulic control, accurate sensor feedback, and uninterrupted operation of cab monitors and joystick electronics. It directly supports CASE 4391 and 4390-series engine reliability — where voltage instability can trigger false fault codes or premature starter motor wear. CASE alternator replacement is not optional maintenance; it’s foundational system integrity.

Engineering Details That Matter

The rotor uses high-purity copper windings with Class H insulation (180°C rating) to sustain peak output during extended high-RPM operation on CASE 580E loaders. The stator core is laminated silicon steel with tight tolerances (±0.05mm) to prevent magnetic flux leakage and ensure consistent voltage regulation. Internal rectifier diodes are rated for 200V reverse blocking and 150°C junction temperature — exceeding OEM spec to handle voltage transients from hydraulic pump load cycling. The front bearing is double-sealed NSK 6002ZZ with lithium-complex grease, designed for 10,000+ hours under radial loads up to 120N. Surface finish on the pulley hub meets ISO 2768-mK standards for precise belt alignment and minimal slippage on CASE 170C and 220B excavators.

The Real Cost of Wrong Parts

A $75 counterfeit alternator may save short-term cost — but causes cascading failures: ECU resets, battery sulfation, and intermittent instrument cluster blackouts that require diagnostic labor averaging $120/hour. Field data from 37 CASE fleet operators shows average secondary repair cost per failed aftermarket alternator exceeds $420 — including tow fees, labor, and delayed job completion. By contrast, this A187873 alternator meets ISO 8528-3 generator standards and carries full traceability to production batch and test logs. Total cost of ownership drops when you factor in 3–12 month warranty coverage, zero unplanned downtime, and compatibility verified against CASE 4391 engine service manuals. CASE 170C alternator replacement isn’t about volts — it’s about predictable uptime.

Why Customers Trust XUNPO

Packaging & Shipping

• Individually sealed in static-resistant pouch, cushioned with molded EPS foam, packed in reinforced corrugated carton with XUNPO branding
• In-stock items ship within 2–5 working days after payment confirmation
• Flexible logistics: DHL/FedEx/UPS express (3–7 days), air freight (7–12 days), or sea freight (25–40 days)
• Real-time tracking number provided upon dispatch, with proactive delay alerts
• MOQ is 1 piece — supporting urgent field repairs and small fleet operators

Get Your CASE Alternator A187873 Now

Your CASE 580E or 170C won’t wait — and neither should your parts order. Send us your machine model, quantity, and destination port — we’ll reply within 24 hours with a firm quote and availability confirmation. First-time buyers can request a sample for bench testing before bulk purchase. Every day your excavator sits idle costs revenue; let’s get it running again with a genuine-performance alternator.

Frequently Asked Questions