Truck Steering Gear Box: Faults, Replacement & Maintenance
Heavy truck steering gear box guide: fault symptoms, pressure testing, replacement steps, torque values and maintenance tips from the VADEN technical team.
Heavy-Duty Truck Technical Blog: Air Brakes, Compressors, Parts & Maintenance
Expert resources for heavy-duty professionals: technical guides on air brake systems, compressors, transmission and engine parts, failure symptoms, maintenance intervals and OE cross-reference charts.
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Recent Posts
Engine Piston & Liner: Faults, Replacement and Maintenance
Piston and liner guide for heavy truck diesel engines: fault symptoms, liner protrusion and shim selection, step-by-step replacement and maintenance.
Belt Tensioner: Failure, Replacement & Maintenance Guide
Diagnose belt tensioner failure on heavy commercial vehicles: symptoms, water-spray test, step-by-step replacement, torque values and maintenance intervals.
Brake Master Cylinder: Faults, Replacement & Care Guide
A commercial vehicle brake pedal that slowly sinks to the floor or goes soft points to the dual-circuit master cylinder: diagnosis, replacement, bleeding.
Oil Separator: Faults, Replacement & Maintenance Guide
On truck diesels, oil at the turbo inlet or air filter often means a clogged crankcase oil separator, not the turbo: symptoms, diagnosis, replacement.
Feed Pump & Hand Primer: Faults, Replacement, Maintenance
Truck feed pump and hand primer guide: how they work, fault symptoms, low pressure diagnosis, replacement steps, torque values, bleeding and maintenance tips.
EBS Modulator: Faults, Diagnosis, Replacement Guide
Technical guide to the EBS modulator on trucks and trailers: how it works, fault symptoms, diagnosis, replacement steps, torque values and maintenance tips.
Transmission Shift Tower: Faults, Replacement & Maintenance
Transmission shift tower faults, diagnosis, replacement steps, torque and pressure values, maintenance and FAQ for heavy commercial vehicles — VADEN guide.
Transmission Control Unit (TCU): Faults, Replacement, Care
Truck TCU guide: fault symptoms, diagnosis order, replacement and adaptation steps, torque and voltage values, plus maintenance tips from VADEN technical.
Fifth Wheel & King Pin: Faults, Replacement & Maintenance Guide
A hard clunk when a tractor unit takes up trailer load usually traces to fifth wheel jaw or king pin wear: sizing, diagnosis, replacement and lubrication.
Engine Oil Filter: Faults, Diagnosis, Replacement Guide
Heavy-duty engine oil filter guide: spin-on vs cartridge types, bypass and anti-drainback valve faults, diagnosis, replacement steps and torque values.
Camshaft: Fault Symptoms, Diagnosis & Replacement Guide
Camshaft faults, symptoms, diagnosis and replacement steps for heavy truck diesel engines, with reference torque and valve clearance values.
Turbocharger: Symptoms, Diagnosis, Replacement & Maintenance
How truck turbochargers work, early failure signs, measuring boost and shaft play, and replacing CHRA units correctly on heavy commercial diesel engines.
Engine Oil Pump: Faults, Diagnosis, Replacement Guide
Engine oil pump symptoms, diagnosis, replacement steps, torque specs and OE-matched VADEN ORIGINAL parts for heavy commercial diesel trucks.
Brake Dust Shield: Faults, Replacement & Maintenance Guide
On a truck, a rusted or bent brake dust shield rubbing the disc looks trivial, yet it shortens pad life and weakens wet braking: diagnosis, replacement, care.
Trailer Control Valve: Faults, Replacement & Maintenance Guide
How the trailer control valve (Anhangersteuerventil) works on heavy trucks, its failure symptoms, gauge diagnosis, replacement steps and OE maintenance tips.
Cab Tilt Pump: Faults, Replacement & Maintenance Guide
If a truck cab won't tilt, won't hold or settles back down, the hand-operated cab tilt pump's check valves and seals are the usual cause: diagnosis and fix.
Levelling Valve: Faults, Replacement & Maintenance Guide
An air-suspended truck or trailer sitting low on one side or not holding ride height points to the levelling valve lever setting: diagnosis and replacement.
Compressor Cooling Plate & Water Cooling: Faults, Repair & Care
Diagnose, replace and maintain the heavy-truck air compressor cooling plate and water cooling: symptoms, internal-leak testing, torque values and FAQ.
Foot Brake Valve: Faults, Replacement & Maintenance Guide
Pedal free play or unbalanced braking on a heavy truck often traces to the dual-circuit foot brake valve: fault diagnosis, gauge testing and replacement.
Quick Release Valve (QRV): Faults, Replacement & Care
How a quick release valve (QRV) works on truck air brakes: fault symptoms, diagnosis, step-by-step replacement, torque values and maintenance tips.
Clutch Fork: Fault, Replacement and Maintenance Guide
In a heavy truck a sinking or rattling clutch pedal usually starts at the release fork pivot ball, not the pressure plate: diagnosis and replacement.
Ford F-MAX Maintenance Guide: Service Intervals, Engine and Parts Selection
Ford F-MAX truck maintenance guide: the Ecotorq engine, Euro 6 emissions, service intervals, air brake system checks and how to choose the right parts.
MAN TGX Maintenance Guide: Generations, Engines and Parts Selection
MAN TGX truck maintenance guide: generations, D20 and D26 engines, TipMatic, air brake system, service intervals and choosing the correct spare parts.
