Alternator 2871A156 12V 85A 1PK Perkins JCB 1104 1106

Product Overview

The 2871A156 is a brand-new generator alternator delivering 12V output at 85A with a 1PK pulley, engineered for Perkins and JCB 1104, 1104D and 1106 engine applications. This unit, cross-numbered as 2871A168, 2871A300 and YLE10099, matches the original charging-system specification for the Perkins JCB industrial engine platform.

This generator alternator is stocked in-house with a 1-year warranty and 10-day dispatch lead-time. The factory-correct 12V 85A rating ensures reliable charging performance for Perkins and JCB 1104, 1104D and 1106 engines.

Key physical specs: net weight 4.7 kg, gross weight 4.95 kg, overall dimensions 240 x 170 x 180 mm, supplied inside neutral kraft inner carton.

The Perkins JCB 1104 1106 Charging Platform

Perkins and JCB 1104, 1104D and 1106 series engines use a 12V charging system with industrial-grade generator alternators. The alternator numbering spans the 2871A series (2871A156, 2871A168, 2871A300, 2871A301, 2871A302, 2871A303, 2871A306, 2871A307, 2871A308, 2871A309, and the 2817A306 variant), the YLE series (YLE10099, YLE10100E, YLE10118), the 633 series (63320349, 63321466, 63377460, 63377461, 6337724479), the 540 series (54022524, 54022606, 54022466, 54022469), the 102211 series (1022118160, 1022118161, 1022118170, 1022118171, 1022118180, 1022118181), the 185046 series (185046, 185046500, 185046501, 185046522), the 244 series (24479, 24480) and the numbers 120A1753, LRB00291, 786635, 2873A301, ALT5136, 3181A084, TPN758, TPN771, 113763, 714-40152 and 225-3141, all referring to the same charging-system family.

It is critical to verify the rated output and pulley configuration on your old alternator: this unit is rated at 12V 85A with a 1PK pulley. Alternators with a different output, pulley configuration or mounting pattern are not interchangeable with this unit. The 1PK single-groove pulley is a key identification point for this Perkins JCB unit, so count the pulley grooves on your old alternator carefully.

Confirm the mounting flange pattern, terminal positions and bolt spacing against your original alternator before ordering. Always cross-check the OE numbers stamped on your old unit, including the 2871A family, before placing an order.

Technical Specifications

Compatibility and Cross Reference

According to the original product page, this alternator is listed for Perkins and JCB 1104, 1104D and 1106 engines. The original page does not publish a detailed fitment table, so do not rely on the engine family name alone for fitment validation; always compare the original part number, mounting holes, pulley configuration and connector configuration before ordering.

Multiple Perkins, JCB OE and aftermarket numbers appear across production batches and regional market specifications for this same alternator family. If your original unit bears one of the listed cross-reference numbers, 2871A156 serves as a direct drop-in replacement.

What to Look for in a Replacement

Follow these five verification steps before placing your order to avoid wrong-part returns:

• 1. Check the voltage and output rating on your old alternator: confirm it is rated for 12V 85A. Other ratings are not interchangeable.

• 2. Check the pulley configuration: this unit uses a 1PK single-groove pulley. Alternators with a different pulley groove count, such as the common 6PK, are incompatible.

• 3. Confirm the platform is a Perkins or JCB 1104, 1104D or 1106 engine. Other platforms may use different alternator assemblies.

• 4. Compare the mounting holes, flange pattern and connector configuration with your original alternator, and match OE numbers including the 2871A family.

• 5. Weight cross-check: genuine matching unit weighs approximately 4.7 kg net; significant weight difference indicates wrong assembly.

Application Scenarios

• Service centers and workshops maintaining Perkins and JCB 1104, 1104D and 1106 powered machinery and equipment.

• Agricultural and construction machinery fleets using Perkins and JCB diesel engines.

• Auto parts retailers and distributors stocking industrial alternators for the off-highway aftermarket.

• Equipment rental companies servicing Perkins and JCB powered machines.

• Exporters supplying Perkins and JCB alternators to global markets.

FAQ

Q: Which engines does this alternator fit?
A: It fits Perkins and JCB 1104, 1104D and 1106 series engines. Confirm your exact engine model and OE number before ordering, and check that your old alternator is a 12V 85A 1PK unit.

Q: The Details Number shows 2817A306, is that correct?
A: The 2817A306 entry is very likely a typographical variant of 2871A306, since the 2871A series numbers all appear in the reference part-number area while 2817A306 appears only once. Both numbers are kept for verification, and 2871A156 serves as the primary reference.

Q: My old alternator shows OE number 2871A168 or YLE10099, will 2871A156 work?
A: Yes. These numbers belong to the same alternator family for the Perkins JCB 1104 1106 platform, differing only by production revision and market specification. It serves as a direct replacement.

Q: My old alternator has a multi-groove pulley, will this 1PK unit fit?
A: No. The pulley groove count must match: this unit uses a 1PK single-groove pulley, and an alternator with a different pulley configuration is not interchangeable. Confirm the pulley configuration of your old alternator before ordering.

Q: Can I fit this alternator onto automotive engines?
A: No. This unit is engineered for Perkins and JCB industrial diesel engines; automotive engines use different alternator assemblies. Confirm your application before ordering.

Q: What is your warranty and lead-time?
A: Goods are in stock with a 10-day dispatch lead-time. A 1-year warranty applies from installation date; warranty excludes damage caused by mis-installation, incorrect wiring, water ingress, short circuit or physical damage.

In Practice

This section is based on the general installation logic of industrial automotive generators and standard maintenance experience for the Perkins JCB 1104 1106 platform. Before starting, turn off the engine, park on a level surface, secure the machine and disconnect the negative battery terminal; for airbag-equipped models, wait at least 90 seconds before continuing. Verify that the new 85A generator is compatible with the engine and check the terminal posts for damage.

Align the new generator with the mounting bracket, insert the mounting bolts and tighten them slightly to leave clearance for belt tension adjustment. Connect the wiring harness in the same order as removal, pushing the connector until the locking clip engages, and tighten the terminal nuts to about 8-12 N.m. Route the drive belt over the generator pulley and the engine pulleys, then adjust tension with the adjustment bolt until a 1/4-1/2 inch deflection is achieved at the longest span. Fully torque the mounting bolts with a socket and ratchet, reinstall any removed components in reverse order, reconnect the battery and start the engine. Check that the charging indicator light turns off and that battery voltage reads about 13.5-14.5V at idle; after 5-10 minutes of running, check the generator surface temperature and listen for abnormal noises.

References

The installation guidance in this article is compiled from general automotive generator maintenance standards and Perkins JCB platform service experience, as the original product page does not publish a specific installation manual or a single official reference document.

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