How-tos

A bad PCV valve starts small—rough idle, rising oil use, or a faint hiss. Ignore it, and you’ll face gasket leaks, drivability issues, and recurring fault codes. This PCV valve replacement guide covers symptoms, testing, and step-by-step installation for tractors, diesel equipment, and work trucks. Learn the difference between PCV valves and CCV filters, when to replace (500–2,000 hours depending on duty), and which mistakes to avoid—like reusing old grommets or installing backward. Whether you’re servicing a gas engine or a Tier 4 diesel, this guide helps you spot ventilation problems early and replace the valve right the first time.

A worn or broken drive belt can bring your mowing to a sudden stop. Whether you’re noticing strange noises and uneven cuts, or the mower simply won’t move, the drive belt is often the culprit. This guide walks you through everything you need to know, from reading a Cub Cadet drive belt diagram to replacing the belt yourself with confidence.

Find the correct John Deere mower Deck Belt Diagram for your 42″, 48″, or 54″ deck. This guide provides clear diagrams, OEM part numbers, and step-by-step replacement tips for popular models like the D105, D130, D140, and L120.

Many Clark forklift owners have asked us, “How do you identify the year of your Clark forklift?” Today, we’ve put together a simple guide on Clark serial number lookup to help you find the year of your equipment.

If your EFI riding mower or zero-turn idles roughly, cranks long after refueling, or throws a P0443 or P0441 EVAP code, the purge valve is one of the first parts to suspect. This guide walks through the 7 bad purge valve symptoms that show up most often on John Deere, Cub Cadet, Husqvarna, Toro, and Bad Boy mowers — from check engine lights and hard starts to hesitation under load and fuel smell near the tank. You’ll also learn how to tell the valve apart from a loose fuel cap, cracked vapor hose, or bad vent solenoid before spending money on the wrong part.

Don’t let faulty wiring sideline your equipment. Our definitive guide to the 3 wire alternator wiring diagram shows you how to connect it right the first time. Learn each wire’s role and how to avoid costly errors.

Understanding the excavator controls doesn’t have to be so complicated. It’s as simple as the first time you learned to drive, from overwhelming at first to eventually automatic. The excavator controls work the same way. They come in two different joystick patterns: ISO vs SAE. Once you grasp the basic movements, operating them becomes second nature.

Choosing the right DEF pump comes down to four practical factors: refill volume, power source, container size, and whether you need mobile or yard-based transfer. A poor match can lead to corroded parts, contaminated fluid, and avoidable SCR system damage. This guide walks through every factor that matters—power options, flow rate sizing, DEF-safe materials, clean transfer practices, and cold-weather performance—plus the mistakes that cost operators the most money. Whether you’re outfitting a service truck, a busy yard, or a bulk fleet operation, you’ll find clear sizing charts, material compatibility rules, and setup recommendations to match your real workflow.

Each Carrier Unit has a decal attached to the frame of the unit inside the roadside door. You can find the decal on the bottom vertical frame next to the display. The decal identifies the model number of the reefer unit, the warranty ID number, the serial number, the type of refrigerant and the refrigerant charge.

A brake fluid change is a routine service on machines with a conventional DOT brake circuit — but not every machine has one. Many tractors, loaders, and other work machines use wet brakes or oil-immersed brake packs that share fluid with the transmission or hydraulic system, where standard DOT brake fluid replacement does not apply at all. This guide explains how to identify the brake system first, recognize when a brake fluid change is actually needed, choose the correct DOT fluid grade, and avoid the wrong-fluid mistakes that can damage seals, contaminate shared oil circuits, and reduce braking performance in the field.

Tackle electrical issues with our detailed Freightliner M2 fuse box diagram. Learn to locate the Power Distribution Module (PDM), understand the multiplexed system, and identify every fuse. Get step-by-step troubleshooting tips to get back on the road.

Facing the SPN 3216 FMI 20 fault code? This error points to a faulty #1 aftertreatment inlet NOx sensor sending incorrect data, causing engine derate and poor fuel economy. Our guide covers causes, symptoms, and step-by-step fixes.