Testing Procedures
The following test procedures should be performed during the inspection to verify operational functionality of key systems:
Brake System Test
- Start engine and allow air pressure to build to governed cut-out (typically 120-125 PSI)
- Turn off engine, release parking brake, and note initial gauge reading
- Apply foot brake fully and hold for one minute
- Check for pressure drop (should not exceed 3 PSI for single vehicle, 4 PSI for combination)
- Start engine and release parking brake; reduce air tank pressure by applying and releasing brake
- Verify low air warning device activates at or above 55 PSI
- Continue reducing air pressure; parking brake should automatically engage (30-45 PSI)
Load Securement Test
- Verify all wrappers meet Working Load Limit requirements
- Ensure minimum number of wrappers used (2 for short logs, more for longer logs)
- Check wrapper placement (proper interval spacing)
- Verify proper tensioning of all load securement devices
- Test securement by checking for wrapper movement or loosening
- Confirm all stakes are secured with chains or pins
- Verify no logs extend beyond legal limits without proper flags/markings
Lighting System Test
- Turn on headlights and verify both low and high beams function
- Check turn signals front and rear (both sides)
- Activate hazard lights and verify all flashers working
- Test brake lights (may require assistance)
- Verify all clearance lights and markers functioning
- Check specialty lighting (strobe/warning lights if equipped)
- Verify trailer lights function in sync with tractor controls
Hydraulic Loader Test (if equipped)
- Engage PTO and activate hydraulic pump
- Deploy stabilizers/outriggers and check for firm contact
- Operate boom through full range of motion
- Test grapple opening and closing function
- Check for smooth operation with no jerking or drift
- Monitor for any hydraulic leaks under pressure
- Return loader to secure travel position
Recommended Inspection Frequency
The following inspection schedule is recommended to maintain safe and compliant log truck operations:
Pre-Trip Inspection
- Complete full inspection before first trip of the day
- Verify all documentation and driver qualifications
- Test all safety systems thoroughly
- Inspect all load securement components
- Document inspection in driver's log or electronic system
- Address any defects before operation
During-Trip Inspection
- Check load securement after first 50 miles (per regulations)
- Recheck load securement every 150 miles or 3 hours
- Verify brake function and tire condition at rest stops
- Assess wrapper tension when temperature changes significantly
- Monitor gauges and warning indicators continuously
- Check lights when operating in reduced visibility
Post-Trip Inspection
- Complete full inspection at end of driving day
- Document any defects discovered during operation
- Note any unusual performance or handling issues
- Verify fluid levels after a day's operation
- Report needed repairs to maintenance department
- Secure vehicle properly for overnight parking
Weekly Maintenance Inspection
- More thorough inspection of all mechanical systems
- Check all fluid levels and top off as needed
- Inspect tire condition more thoroughly, check inflation
- Lubricate all fittings per maintenance schedule
- Clean electrical connections to prevent corrosion
- Verify condition of specialized logging equipment