This video is supplemental information to provide additional clarification and details for the preparation and procedure required for purging the oil and nitrogen from the suspension cylinders on Large Off-Highway Trucks. Also, this document contains an incremental charging procedure for the oil and nitrogen used in the suspension cylinders on Large Off-Highway Trucks.
Read the entire Special Instruction (SEHS9411) before you proceed with any work on the suspension cylinders. Trucks may have different weight configurations due to differences in dump body, liners, engines, custom attachments. The different weight configurations can cause varied carry pressures.
The suspension system on Large Off-Highway Trucks consists of four suspension cylinders. The benefits of charging the suspension cylinders with the proper amount of oil and nitrogen include:
- Better machine ride
- Improved structural durability
- Improved shock absorption and operator comfort
- Higher suspension cylinder reliability
- Improved ability to maintain the intended level of controllability
- Better operating efficiency
- Increased accuracy of the payload measurement system