I. Purpose & Scope

To safely and effectively provide instruction on the inspection and proper use of bore trailers.

II. Definitions

Standard PPE – High Viz Garment, Hard Hat, Z-87.1 Safety Glasses, Gloves, Pants, Work Boots

III. Process

NOTE: Work instruction does not supplement the manual. For specific instructions for the exact model please refer to the owner’s manual.

A. Potential Hazards

• Crushing Hazard

B. PPE

• Standard PPE

C. Inspection

1. Check and maintain proper inflation of tires. 
2. Check wheel nuts and maintain proper torque. 
3. Check oil level of wheel bearings. Check for overheating or excessive wear. Fill hub with appropriate oil to indicated level on hub cap. 
4. Keep battery charged and check regularly for proper charge. 
5. Check trailer plug and truck receptacle for damage and/or corrosion, and that they fit tight. 
6. Inspect all lights for proper operation and replace as necessary. Check for proper operation and possible loose connections, or improper wiring between tow vehicle and trailer. 
7. Check jack for any physical damage or improper operation due to corrosion. Replace if severely damaged or rusted. Check bolts for tightness and be sure the lock washers and/or lock nuts are used. 
8. Check for physical damage to “D” ring, clips, or welds and replace or repair immediately. 
9. Check eye bushings in springs for wear and replace any part if wear shows. 
10. Inspect coupler for excessive wear and replace as needed. 
11. Inspect tow ring for tightness. If ring shows excessive wear replace immediately. Double nut bottom bolts. 
12. Check brake controller for proper operation both automatic with tow vehicle foot pedal and manually. Replace if defective or damaged. Trailer braking should be adjusted so that trailer brakes react and apply at the same time as tow vehicle brakes come on. Adjust for proper braking effect for loads being towed. 

D. Use

1. Be sure trailer is connected to tow vehicle when loading and unloading machinery. 
2. Lock tow vehicle brakes before loading and unloading. 
3. Use wheel chocks when loading or unloading. 
4. Trailer should be level when fully loaded. If trailer is low in front when loaded, adjust coupler to make level (or slightly higher in front). 

E. Maintenance

Brake Adjustment

1. Jack up trailer and secure on adequate capacity jack stands. Do not lift or place supports on any part of the suspension system. Check that the wheel and drum rotate freely. 
2. Remove the adjusting hole cover from the adjusting slot on the bottom of the brake backing plate. 
3. With a screwdriver or standard adjusting tool, rotate the starwheel of the adjuster assembly to expand the brake shoes. Adjust the brakes shoes out until the pressure of the linings against the drum makes the wheel very difficult to turn. 
4. Rotate the starwheel in the opposite direction until the wheel turns freely with a slight lining drag. 
5. Replace the adjusting hole cover and lower the wheels to the ground. Repeat for all brakes.