32–00 Safety Precautions
Safety Precautions in this section apply to all
procedures within this group.
DANGER
When working on the vehicle, shut down the en-
gine, set the parking brake, and chock the tires.
Before working under the vehicle, always place
jack stands under the frame rails to ensure the
vehicle cannot drop. Failure to follow these steps
could result in serious personal injury or death.
32–01 Suspension Fastener
Torque Check
WARNING
Inspect the suspension fasteners. Failure to per-
form inspections could result in separation of
worn suspension components and loss of vehicle
control, possibly causing personal injury or death,
or property damage.
1. Chock the front or the rear tires. Working at the
front of the vehicle or at the rear of the vehicle,
raise the vehicle so that the tires just clear the
ground and the suspension is fully extended.
Place safety stands under the vehicle frame.
2. Check the suspension fasteners. See
Table 1 for
correct fastener torques.
3. Check the torque of the rear axle U-bolts.
In a diagonal pattern, tighten all 5/8–18 U-bolt
nuts 205 lbf·ft (278 N·m); tighten all
3/4–16 U-bolt nuts 300 lbf·ft (407 N·m); and
tighten all 7/8–14 U-bolt nuts 460 lbf·ft (624
N·m).
NOTICE
Failure to retorque the U-bolt nuts could result in
spring breakage and abnormal tire wear.
4. Remove the safety stands and lower the vehicle
to the ground.
32–02 Suspension Height
Control Valve Check
WARNING
Inspect the height control components and check
their operation. Failure to perform these inspec-
tions and checks could result in separation of
worn suspension components and loss of vehicle
control, possibly causing personal injury or death,
or property damage.
1. Park the vehicle on a level surface. Apply the
parking brake and chock the tires to prevent the
vehicle from moving.
2. Inspect the front and rear suspensions for any
signs of damage, loose components, wear, or
cracks. Replace any damaged components to
prevent failure or equipment breakdown.
3. Inspect all bolts and nuts at the pivot axle con-
nections to assure that they are properly torqued.
Check all other nuts and bolts for proper torque.
See
Group 00 of this manual for proper torque
specifications.
4. Check the air pressure gauge to confirm that
there is in excess of 65 psi (448 kPa) in the air
system, and inspect the air springs for sufficient
and equal firmness.
Suspension Torque Specifications (lubricated threads)
Description Size Torque: lbf·ft (N·m)
Shock Absorber Mount Locknut 3/4–16 110 to 150 (149 to 203)
Air Spring Upper Mounting Plate Locknut 3/4–16 31 to 42 (42 to 57)
Air Spring Upper Mounting Plate Capscrew 1/2–13 31 to 42 (42 to 57)
Air Spring Lower Mounting Plate Capscrew 1/2–13 31 to 42 (42 to 57)
Transverse Beam Bushing Locknuts 1-1/4–12 600 to 700 (814 to 949)
Suspension 32
Recreational Vehicle Chassis Maintenance Manual, June 2015 32/1
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