Auto alternator motor 082V26101-7271 JFZ2980ZH1 for Sinotruk MAN D08 engine T5 truck German MAN series engine
Applicable models:Sinotruk MAN D08 engine T5 truck German MAN series engine
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Reference part number: JFZ2980ZH1 JFZ280-3003 082V26101-7278 JFZ280-0203 JFZ280-3002 202V26101-7271/JFZ298
Product Attributes
| Rated output : | 28V 80A |
| Pulley : | 8PK |
| Size : | 34*20*15cm single unit inner box |
| Weight : | net weight：7.6KG |
| Packaging : | Neutral kraft paper packaging |
| Spot/Pre sale : | Spot goods |
| Warranty : | 1 year |
| Product number : |
Product Details
| Type : | ACgenerator Alternator |
| Specification : | 28v80A |
| Pulley : | 8PK |
| Brand : | NUOJIN |
| Number : | 082V26101-7278 |
| Quality : | REMANUFACTURE |
| Delivery time : | 10DAY--30DAY |
Installation Method for MAN 28V 80A Alternator (Professional Version)
Applicable: MAN 28V 80A alternator for commercial vehicles & engineering machinery.Suitable for repair orders, technical documents and export materials.
I. Safety Operation Specifications (Mandatory)
1. Electrical Safety (Required)
Disconnect the battery negative terminal (-) first, move and secure the cable to prevent sparks, wiring damage or short-circuit fire caused by accidental grounding of the B+ constant-power terminal.Wait 5 minutes after disconnection to discharge residual voltage in the engine electronic control system.Wear insulated gloves and safety goggles at all times. Do NOT work with power connected.Open flames and smoking are strictly prohibited in the work area. Keep away from fuel lines, high-pressure oil pipes and high-temperature exhaust pipes.
2. Vehicle Support Safety
Park the vehicle on a flat, solid, non-slip surface. Apply the parking brake; put automatic transmission in P and manual transmission in N, install wheel chocks.Support the vehicle with safety stands; never work with only a jack.
3. Tool Counting
Count all tools before and after the job. Do not leave sockets, wrenches or bolts in the engine compartment or near the transmission to avoid component damage after startup.
II. Pre-Installation Inspection (Required)
1. Alternator Matching Confirmation
Model: MAN 28V 80A, voltage 28V, rated current 80A.Mounting spigot, hole spacing and bolt size match the original vehicle.B+ power terminal and excitation/control plug position and shape are fully matched.Do NOT use alternators of different voltage, current or models; otherwise, it will cause abnormal charging, burning or no power generation.
2. New Alternator Appearance Inspection
Housing free of cracks, deformation or impact damage.Pulley free of looseness, deformation or wear.Wiring terminals free of oxidation, burning or looseness.No abnormal noise or internal seizure.Defective alternators are prohibited from installation.
3. Mounting Position and Accessory Inspection
Alternator bracket free of deformation or cracks; mounting bolt holes free of damaged threads or blockage.Drive belt free of cracks, aging or slipping; pulley grooves clean and oil-free.Battery, charging wiring, fuses and relays free of burning or looseness.Flywheel/crankshaft pulley free of deformation or looseness.
III. Old Alternator Removal Steps
1. Release Belt Tension
Use a belt tensioner tool to loosen the tensioner pulley and remove the alternator drive belt.Take photos of the belt routing for later installation reference.
2. Disconnect Electrical Connections (Strict Sequence)
Unplug the excitation/control plug (small plug) first.Remove the B+ main power cable (large terminal) and insulate it immediately with electrical tape to prevent grounding.Disconnect the ground cable last.
3. Remove Mounting Bolts
The alternator is usually secured to the bracket with 2–3 mounting bolts.Loosen bolts diagonally in stages to avoid bracket deformation from uneven stress.Support the alternator (approx. 6–8kg) and remove it slowly to prevent dropping and damaging components.
4. Clean Mounting Surface
Clean the alternator bracket mounting surface, remove oil, metal chips and impurities.Inspect threaded holes and clear blockages or metal chips.
IV. New Alternator Installation Steps (Core)
Step 1: Positioning and Pre-Tightening
Place the new alternator smoothly into position, ensuring the mounting surface is fully seated against the bracket.Thread mounting bolts by hand 3–4 turns to confirm proper threads; do not fully tighten yet.
Step 2: Belt Installation and Tension Adjustment
Install the drive belt following the original routing. Adjust belt tension using the tensioner tool.Standard belt tension: 10–15mm deflection when pressing the middle of the belt.Preliminarily secure the tensioner pulley after adjustment.
Step 3: Torque Tightening (MAN Standard)
Alternator mounting bolts: 45–50 N·m (tighten diagonally in stages)B+ power terminal: 20–25 N·mGround terminal: 10–12 N·m
Excessive torque → bolt breakage, housing cracking;Insufficient torque → looseness, noise, poor contact.
Step 4: Electrical Connection (Strict Sequence)
Connect the ground cable first and tighten securely.Plug in the excitation/control plug and ensure it locks reliably.Connect the B+ main power cable last. After tightening, cover with an insulating cap/tape to prevent short circuits.Route all wiring away from high-temperature and moving parts, secure with cable ties to prevent abrasion or short circuits.
V. Post-Installation Inspection and Testing
1. Mechanical Inspection
Rotate the crankshaft manually 2–3 times to confirm smooth belt operation, no seizure, interference or abnormal noise.Check that the alternator, pulley and tensioner pulley are secure.
2. Electrical Testing
Reconnect the battery negative terminal.Turn the ignition switch to ON; the charging indicator light should illuminate.Start the engine; the charging indicator light should turn off immediately.Measure with a multimeter:Idle charging voltage: 28.0–29.5 VMedium/high-speed charging voltage: 28.5–30.0 V
If voltage is abnormal, check wiring, regulator and alternator.Check for no looseness, overheating, unusual odors or abnormal noise.
Installation Precautions for MAN 28V 80A Alternator (Complete Professional Version)
For direct use in repair orders, export technical documents and customs documentation.
I. Safety Operation Precautions (Mandatory)
Must Disconnect the Negative Battery Terminal First
Disconnect the negative battery terminal (-) before removing or installing the alternator, move the cable away and secure it.This prevents sparks, burnt wiring, short-circuit fires or damage to the electronic control unit caused by accidental grounding of the B+ constant-power terminal.Wait 5 minutes after disconnection to fully discharge residual voltage from the vehicle’s electronic control system.
Safe Vehicle Support
Park the vehicle on a flat, solid, non-slip surface. Apply the parking brake firmly; put automatic transmission in P and manual transmission in N. Install wheel chocks front and rear.Support the vehicle securely with safety stands. Never work only with a jack to prevent vehicle slipping and injury.
Personal Protection and Worksite Safety
Wear insulated gloves and safety goggles during the entire operation to avoid electric shock, scratches and burns.Open flames and smoking are strictly prohibited in the work area. Keep away from fuel lines, high-pressure oil pipes, high-temperature exhaust pipes and the battery to prevent fire or explosion.
Tool Counting
Count all tools before and after the job. Do not leave sockets, wrenches, bolts, etc., in the engine compartment, near brackets or moving parts to avoid component damage during operation.
II. Alternator Matching and Inspection Precautions
Model Must Be Fully Identical
Only use the original MAN 28V 80A alternator.Confirm: 28V voltage, 80A current, mounting spigot, hole spacing, bolts and wiring plugs all match the original vehicle.Do NOT use alternators of different voltage, current or models; otherwise, it will cause no charging, overcharging, burnt wiring or battery damage.
New Alternator Must Be Inspected Item by Item
Housing free of cracks, deformation or impact damage
Pulley free of looseness, wear or deformation
Wiring terminals free of oxidation, burning or deformation
No internal seizure or abnormal noise
Defective alternators are prohibited from installation.
Mounting Position and Accessories Must Be Inspected
Alternator bracket free of deformation or cracks; threaded holes intact with no damaged threads.Drive belt free of aging, cracks or oil contamination; tensioner in normal working condition.Battery, wiring, fuses and relays free of burning or looseness.
III. Removal Precautions
Loosen the Belt First, Then Disconnect Power
Release belt tension → disconnect electrical plugs → remove mounting bolts last.
Strict Electrical Disconnection Sequence
Unplug the excitation/control small plug first → remove the B+ main power cable → disconnect the ground cable last.The B+ cable must be insulated immediately after removal; grounding is strictly forbidden.
Do Not Pull Wires or Plugs
Grasp the plug body when unplugging; never pull the wire directly to avoid core breakage or poor connection.
References：
Authoritative References for Installation Precautions
MAN 28V 80A Alternator
(For direct use in technical documents)
Core Basis: MAN OEM Service ManualApplicable engines: All MAN commercial vehicle & construction machinery enginesApplicable system: Engine Charging Alternator System Section
Referenced contents:
Standard procedures for alternator removal and installation
Mounting bolt torque: 45–50 N·m
B+ power terminal torque: 20–25 N·m
Ground terminal torque: 10–12 N·m
Standards for alternator installation, belt tension and charging voltage testing
Electrical safety and disassembly/assembly sequence specifications
MAN Official Alternator Installation & Safety Procedure
Disconnect the negative battery terminal before service
Striking the alternator housing, terminals or pulley is strictly prohibited
B+ main power terminal must be insulated
Charging voltage inspection must be performed after installation
National / Industrial General Standards
QC/T 731‑2023
Technical Specifications and Installation Code for Automotive Starters and Alternators
GB 7258‑2017
Technical Specifications for Safety of Power-Driven Vehicles Operating on Roads
General safety installation standards for 24V/28V electrical systems of commercial vehicles
Scope of ApplicationThese precautions apply to the disassembly, repair and replacement of 28V 80A alternators used on all MAN commercial vehicles and construction machinery.
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