The answers technicians need, at the truck.
A reference library written by diesel mechanics and fleet maintenance professionals — torque values, hydraulic and electrical diagnostics, fluid capacities, and PM references organized the way the work actually happens.
Built on Experience. Backed by Knowledge.
Air Brake System
Truck & Trailer System — Quick Reference Guide
The first title in the BlackHorn Quick Reference series. Accurate system diagrams, component breakdowns, and troubleshooting flow for tractor and trailer air brake systems — written by mechanics for shop-floor use.
Quick Reference Guides in stock
Live from the BlackHorn store — pricing, availability, and checkout handled by Shopify.
Ten references built for the shop floor
Each guide covers one subject in depth, in a format a technician can keep in a toolbox, service truck, or shop desk. Additional titles are added as they are written.
Torque Specifications
Common fastener torque values, bolt grades, thread pitch charts, and torque-to-yield notes for heavy truck and equipment work.
Hydraulic Troubleshooting
Symptom-to-cause charts for pumps, cylinders, valves, and circuits — pressure testing steps and contamination checks in field order.
Electrical Diagnostics
Voltage drop testing, grounding checks, parasitic draw procedures, and connector repair steps for 12V and 24V systems.
Fuse & Relay Guide
Fuse ratings, relay pin layouts, and circuit identification references for tracing power and control faults quickly.
Grease & Lubrication Guide
Grease types, NLGI grades, compatibility charts, and lube interval guidance for chassis, bearings, and equipment pins.
Heavy Equipment Fluid Capacities
Fill capacities and fluid specifications organized by system so service techs stop hunting through manuals mid-PM.
Diesel Engine Specifications
Valve lash, injector settings, oil pressure ranges, and service specs for widely used heavy-duty diesel engines.
Preventive Maintenance Reference
PM interval frameworks by hours, miles, and calendar — with inspection points grouped by system for consistent service.
Diagnostic Trouble Code Reference
SPN/FMI and J1939 fault code structure explained, plus a workflow for turning a code into an actual diagnosis.
Fleet Safety Quick Guide
Lockout/tagout, lifting and jack stand practice, fluid handling, and shop safety checks written for working technicians.
Written from repair work, not reprinted from manuals.
Every guide comes out of real diagnostic and repair experience on trucks, trailers, and heavy equipment. The goal is simple: fewer trips back to the office, fewer guesses, and a repair done right the first time.
- One subject per book, covered completely
- Written by working diesel technicians
- Pairs with Fleet Forms recordkeeping
- Field-durable print format