Alternator 143701001 464.3701 700.04 for Belarus MTZ-80 MTZ-82 T-50 T-70 T-70B T-80 T-90C XTZ
Applicable models: Belarus MTZ-80 MTZ-82 T-50 T-70 T-70B T-80 T-90C XTZ
Reference part number:143701001 464.3701 700.04
| Rated output : | 12V 1000W |
| Pulley : | 1PK |
| Size : | 24*18*17single unit inner box |
| Weight : | net weight：5.4KG |
| Packaging : | Neutral kraft paper packaging |
| Spot/Pre sale : | Spot goods |
| Warranty : | 1 year |
| Product number : |
| Type : | ACgenerator Alternator |
| Specification : | 12V 700A |
| Pulley : | 1PK |
| Brand : | NUOJIN |
| Number : | 143701001 464.3701 |
| Quality : | NEW |
| Delivery time : | 7--10DAY |
1. Pre‑installation Preparation
1.1 Tools and Spare Parts
1.2 Safety Prerequisites
Stop the tractor, remove the ignition key, and disconnect the negative terminal of the battery to prevent short circuits and sparks.
Allow the engine to cool down completely to avoid scalding.
Clean the generator mounting area and front engine accessories, removing oil contamination and debris.
2. General Standard Installation Procedure
Step 1: Remove the Old Generator (For Replacement)
Step 2: Install the Generator Bracket and Main Unit
Step 3: Install and Tension the Drive Belt
Step 4: Electrical Wiring (Critical, Distinguish Between Excited and Permanent Magnet Types)
4.1 General Wiring Definition
B+ / +: Positive output terminal of the generator. Connect directly to the positive terminal of the battery with a heavy‑gauge cable. A fuse of the original factory rating must be installed in the circuit to prevent short‑circuit fires.D+ / EXC / Excitation: Excitation terminal. Connect to the onboard voltage regulator or the rear end of the ignition switch to establish the excitation magnetic field and initiate power generation.GND / -: Generator housing or dedicated ground terminal. Connect to the tractor frame or engine cylinder block via a ground cable to ensure reliable grounding. The grounding resistance should be less than 0.5 Ω.Some models include a charging indicator wire, which connects to the dashboard charging light. The light should turn off once the generator operates normally.
4.2 Wiring Specifications
Polish the generator terminals and cable lugs with sandpaper to ensure clean, oxide‑free metal contact surfaces.
Crimp the wiring terminals securely, and insulate them with heat‑shrink tubing or insulating tape to avoid short circuits.
Route the wiring harness away from high‑temperature components such as the exhaust pipe and turbocharger, as well as moving parts including fans and belts. Secure the harness with cable ties, leaving a small amount of slack for vibration absorption.
After wiring is complete, double‑check the polarity of positive, negative and excitation cables, as well as the ground connection. Reverse wiring is strictly prohibited, as it will instantly burn out the generator diodes and voltage regulator.
Step 5: Reassembly and Commissioning
Observe the dashboard charging indicator, which should turn off under normal conditions.
Measure the battery terminal voltage with a multimeter. The voltage at idle should be above 13.0 V, and stabilize between 13.8 V and 14.2 V at medium throttle, which is within the normal range.
Check for abnormal noise, overheating or oil leakage from the generator and belt drive. Inspect the terminals for overheating or sparking.
After stopping the engine, retighten all bolts and clean the work area.
III. Key Model Differences and Precautions
| Model | Core Installation Features | Key Precautions |
|---|---|---|
| MTZ‑80 / MTZ‑82 | Front-mounted open installation, with cast‑iron adjustable brackets, mostly equipped with an external voltage regulator | The space for belt tensioning is limited; pay attention to the travel of the adjusting arm. The grounding of the regulator must be reliable, as unstable charging is prone to occur. |
| T‑50 | Compact layout, with the generator positioned close to the exhaust pipe | Adequate heat insulation for the wiring harness is mandatory, and high‑temperature resistant wiring harnesses should be used. Due to the narrow installation space, the fan shroud should be removed first. |
| T‑70 / T‑70B | Higher‑strength brackets, dual mounting points on some models | The two fixing bolts must be tightened simultaneously to prevent bracket deformation, which would cause uneven belt wear. |
| T‑80 / T‑90C | High‑power models with generators of higher rated current, requiring thicker wiring harnesses | Charging cables with the corresponding wire gauge must be used. Replacement with thin wires is strictly prohibited to avoid overheating and fire risks. |
| XTZ Series | Structure similar to the MTZ series, with integrated voltage regulators on some models | Models with integrated regulators do not require an external regulator. Connect directly according to B+, D+ and ground terminals; additional external regulators are not allowed. |
References：
I. Core Official Technical Documents (Basic References)
1. Original Factory Manuals of Minsk Tractor Works (MTZ)
- Тракторы «Беларусь» МТЗ‑80, МТЗ‑82 и их модификации. Инструкция по эксплуатации и техническому обслуживанию(Belarus MTZ‑80, MTZ‑82 Tractors and Modifications – Operation and Technical Maintenance Manual), 1990 edition, authored by Левков В.Г. and Бруенков И.Ф., published by Minsk Tractor Works. This manual specifies core parameters including generator bracket installation, belt tensioning and wiring standards.
- Official MTZ Parts Catalog:БЕЛАРУС – 80.1/80.3/80.1‑34/11 82.1/820/82.3 КАТАЛОГ ДЕТАЛЕЙ И СБОРОЧНЫХ ЕДИНИЦThis catalog lists key spare‑part specifications such as generator mounting bolt sizes and drive belt models.
- BELARUS SERIES 80.1/80.2/82.1/82.2/82Р OPERATION AND SERVICE MANUALThe English‑language service manual for MTZ series tractors contains detailed instructions on generator installation procedures, electrical wiring and commissioning acceptance.
