Suspension System; Air Ride Suspension - Midland SIDE DUMP GRAVEL TRAILER Operator's Manual

5.2.12

SUSPENSION SYSTEM

The suspension system is
the group of components
that connect the axle to
the main trailer frame and
absorb the shock loads
from the road. Midland
trailers can be equipped
with either a mechanical
or air ride suspension
system. Either system
works well and will
provide many years of
trouble-free service.
5.2.21.1 AIR RIDE
SUSPENSION
An air ride suspension
consists of air springs
that are inflated and
pressurized by the trailer
air system and controlled
by a height control valve.
It is a simple system that
requires minimal servicing
and maintenance to
perform well.
Visually inspect the trailer
at the start of the day or
trip to check the condition of the suspension.
Ensure that the ride height is set as per proper
specifications. Also, check for loose fasteners
or damaged components. Correct any
problems before placing the trailer into service.
Problems caught early and corrected minimize
cost and downtime.
Every 5,000 miles (8,000 km) or monthly, check
the clearance around all the suspension system
components. Correct any interference problem.
Retorque all the fasteners to their specified
torque.
Every 25,000 miles (40,000 km) or 3 months,
visually inspect all components and welds for
cracks, distortions or other damage. Repair or
replace all defective components before placing unit
into service.
Fig. 62 HENDRICKSON SUSPENSION BOLT TORQUE VALUES
Fig. 63 RIDEWELL SUSPENSION BOLT TORQUE
VALUES
71