Oil Spray Jet: Faults, Replacement and Maintenance Guide
Engine oil spray jet guide for trucks: how piston cooling nozzles work, clogging and low oil pressure symptoms, diagnosis, replacement steps and torque values.
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
Hydraulic Clutch Pedal Unit: Fault Diagnosis, Replacement, Maintenance
How to diagnose a faulty hydraulic clutch pedal unit on trucks, replace and properly bleed it, and maintain it to prevent a spongy clutch pedal.
Cab Suspension (Shock Absorber, Air Bellow, Leveling Valve): Faults & Repair
How to diagnose truck cab suspension faults, replace the shock absorber, air bellow and leveling valve safely, and keep the cab level and comfortable.
Clutch Hose Failure, Replacement and Maintenance Guide
Clutch hose symptoms, swelling test, step-by-step replacement, torque values and maintenance tips for heavy commercial vehicles — VADEN technical guide.
Emergency / Park-Release Valve: Faults, Replacement, Care
How the trailer park-release valve locks and releases spring brakes, why it sticks or leaks air, plus diagnosis, replacement steps and torque values.
Lift Axle Valve: Faults, Replacement and Maintenance Guide
Lift axle valve guide for trucks and trailers: how it works, fault symptoms, pressure diagnosis, step-by-step replacement and maintenance checkpoints.
Turbo Intake & Exhaust Inlet Pipe: Faults and Replacement
Turbo intake and exhaust inlet pipe faults on trucks: leak symptoms, diagnosis, step-by-step replacement, torque values and maintenance tips from VADEN.
Flywheel Housing: Faults, Replacement & Maintenance Guide
Flywheel housing (bell housing) on heavy trucks: failure symptoms, dial indicator runout checks, step-by-step replacement, torque values and maintenance.
Steering Drag Link & Tie Rod: Faults, Replacement, Care
On trucks, steering play usually starts at the drag link and tie rod ball joints, not the box: wear testing, safe replacement and toe alignment afterwards.
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.
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.
