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SPN 520372 FMI 16 indicates the DEF supply unit temperature is higher than normal on John Deere equipment, often leading to derates and repeated faults. This guide explains real-world causes such as heat buildup, flow restrictions, wiring issues, and sensor bias, along with a clear troubleshooting sequence. Follow a structured process to identify the root cause, avoid unnecessary replacements, and restore reliable aftertreatment performance.
Dead battery and dim lights plaguing your ride? Before you blame the battery, the real culprit might be your stator. Grab a multimeter and follow our 5-step guide to test your stator and pinpoint the problem in minutes. Save money and get back on the trail!
SPN 639 FMI 2 points to unstable CAN communication that can trigger derates, gauge failures, and intermittent faults. This guide breaks down the real causes—from wiring and connectors to power supply issues—and provides a practical step-by-step diagnostic process. Learn how to test network resistance, isolate faulty sections, and fix problems efficiently without replacing parts blindly.
Need a diagram of what wires go to the starter solenoid? This guide explains the B, S, and M terminals for heavy equipment. We cover the correct wiring process, safety protocols, and troubleshooting a no-crank situation.
This guide explains Cummins fault codes for M11 and N14 CELECT engines, helping you quickly diagnose issues in demanding off-road conditions. Learn how to interpret sensor, injector, and protection codes, perform targeted checks, and avoid guesswork when troubleshooting. With the right approach, you can reduce downtime, prevent engine damage, and make accurate parts decisions.
Engine roaring louder than usual? Overheating in traffic? Your fan clutch might be failing, silently robbing you of power and fuel. Before you suspect a bigger issue, learn the 5 tell-tale symptoms and how a simple, no-tool “spin test” can diagnose a bad fan clutch in minutes. Find out now!
A faulty EGT sensor can sideline your machine. This guide covers key exhaust gas temperature sensor failure symptoms, including power loss, poor fuel economy, and DPF regen problems. Learn to diagnose the issue and prevent downtime.
Stuck with a stubborn fan clutch and no special tool? You’re not alone. This guide reveals 3 field-tested tricks using just a hammer or pry bar to break it loose. Turn frustration into a quick fix and get your machine running again. It’s easier than you think!
When tracing the year of your MF tractors, you must locate the serial number plate. Luckily, the serial number plate locations across many MF models are very similar. It is commonly seen in one or more of the following locations, depending on the year and series.
Water in your hydraulic oil causes slow response and serious damage. This guide shows you how to remove water from hydraulic oil with methods from simple settling to vacuum dehydration, and helps you decide whether to clean or replace it.
The P0744 code signals an intermittent torque converter clutch problem that can lead to overheating, slippage, and power loss. This guide walks through real causes—from fluid issues to solenoid faults—and shows how to diagnose and fix them step by step, helping you avoid costly transmission damage and reduce downtime.
Compression in a diesel engine is critical for effective and efficient performance. Low compression leads to costly damage. A simple engine compression test can help spot compression problems before things get worse. This article walks through how to perform a compression test for your diesel engine.
