MACHFIX Blog
Heavy equipment fault fixes and maintenance guides, explained clearly.
Black smoke from the exhaust: causes and fixes
Black smoke means incomplete diesel combustion. These are the most common causes on excavators and loaders, and how to check them from cheapest to most expensive.
Engine won't start or starts hard: what to check
From the battery to the fuel to air in the lines: an ordered checklist to find out why your machine's engine is slow to start or won't start.
Engine loses power under load: causes and fixes
Excavator slows down when digging, or the loader can't lift? These are the most common causes of engine power loss, from filters to the turbo.
500-hour service for excavators and backhoes: what to change and check
A clear checklist of the key 500-hour service items: oil, filters, greasing and inspections, so nothing gets missed.
Air filters on dusty sites: when to clean and when to replace
Dust is the engine's number one enemy in Saudi Arabia. When cleaning the air filter is enough, when you must replace it, and why you never touch the inner filter.
Greasing backhoes and excavators: why daily, and how to protect pins and bushes
Daily greasing is the cheapest and most effective maintenance. Here is the right way to grease, and the signs that pins and bushes need replacing.
Battery drains fast on heavy equipment: alternator or parasitic drain?
You charge the battery and it goes flat again? How to tell whether the problem is the battery itself, the alternator, or something drawing power while the machine is off.
Sensor or wiring fault? How to tell FMI 3 from FMI 4
Before buying a new sensor, understand what the FMI number is telling you. Most FMI 3 and 4 codes are caused by wiring and connectors, not the sensor itself.
Machine clicks but won't crank: battery, starter or relay?
You turn the key and hear a click or rapid clicking but the engine doesn't move? Simple steps to pin down the fault before replacing the starter.
Heavy, slow boom: causes of weak hydraulics on excavators and backhoes
Boom movement has become slow or it won't lift? Before suspecting the pump, check these simpler causes in order.
Hydraulic hose leak: safety first, then the right replacement
A leaking hydraulic hose is a real hazard, not just wasted oil. How to deal with it safely, and how to order the right replacement the first time.
Hydraulic cylinder leaking: when to replace the seal kit
Oil on the cylinder rod, or the boom drifting down by itself? How to tell a cylinder needs a seal kit, and what to check before fitting it.
Genuine, OEM or aftermarket? The difference and when to choose each
A clear explanation of the difference between dealer genuine parts, original equipment manufacturer (OEM) parts and aftermarket parts, and how to choose by part, machine and budget.
How to find the correct part number for your machine (and avoid parts that don't fit)
Serial number, the number on the old part and the parts manual: the easiest ways to order the right part the first time.
Bucket and loader teeth: how to choose the right type and when to replace
General or rock teeth? When should you replace a tooth before it damages the adapter? A short guide that saves fuel and parts.
Low engine oil pressure in excavators: causes and fixes
Why the oil pressure warning appears, what to check yourself before calling a technician, and when to stop the machine immediately.
Engine overheating in summer: causes and fixes
Radiator, coolant level and fan: checks to do before the problem gets bigger.
How to read J1939 codes (SPN and FMI) yourself
A simple explanation of the generic code numbers that appear on most diesel engines.