How do I Maintain Leaf Spring Suspension Systems?

Maintaining a leaf spring suspension system requires a combination of regular visual inspections and specific mechanical upkeep to ensure safe towing. Based on expert recommendations, you should follow these routines:

Monthly Inspections: On a flat surface, visually check the leaves for cracks, excessive rust, or sagging. You can identify sagging by measuring the ride height from the trailer frame to the ground to see if it meets manufacturer specifications. Additionally, inspect the shackles and bushings for any signs of play or wear.

Quarterly Lubrication: Use a grease gun to apply marine-grade grease to the zerk fittings on the bushings. Continue applying grease until it purges from the ends; this reduces friction and prevents the components from seizing.

Annual Adjustments: Verify that the load is distributed evenly across the axle by using a torque wrench to check all bolts. Specifically, ensure that U-bolts are tight and that shackle bolts are torqued to approximately 45-55 ft-lbs.

General Care: It is also recommended to lubricate shackles and hangers every 5,000 miles to prevent binding. If you notice flattened or separated leaves, it may indicate overload stress, signaling that the springs need replacement to maintain vehicle stability.