17730-299
57
Component Replacement
ULTIMAAX
®
for Fire and Rescue Vehicles
SECTION 9
Troubleshooting Guide
ULTIMAAX for Fire and Rescue Vehicles
TROUBLESHOOTING GUIDE
CONDITION
POSSIBLE CAUSE
CORRECTION
Suspension has harsh or
bumpy ride
Damaged shock absorber
Replace shock absorbers
Damaged progressive load spring
Replace progressive load springs, must be replaced in pairs
Damaged shear spring
Replace shear spring
Vehicle overloaded
Redistribute or reduce load to correct weight
Vehicle leans
Damaged progressive load spring
Replace progressive load springs, must be replaced in pairs
Damaged shear spring
Replace shear spring
Bent cross tube
Replace cross tube
Weight bias
Redistribute load to correct weight bias
Irregular tire wear
Incorrect axle alignment
Axle alignment is permanently set at the time of vehicle
manufacture . Contact vehicle manufacturer .
Bent cross tube
Replace cross tube
Damaged, bent, cracked suspension
component
Replace damaged component
Loose or missing suspension
fasteners
Suspension is overloaded
Reduce and/or redistribute load to correct weight
Replace and/or properly tighten fasteners to the proper torque
specification
Improper torque or over torque
Increase inspection interval of fasteners
Replace and/or properly tighten fasteners to the proper torque
specification
Frame hanger cracked
Suspension is overloaded
Replace frame hanger assembly
Reduce and/or redistribute load to correct weight
Loose or missing suspension fasteners
Replace frame hanger assembly
Increase inspection interval of fasteners
Replace fasteners and/or properly tighten fasteners to the
proper torque specification
Damaged frame hanger assembly
Replace frame hanger assembly
Saddle leg to equalizing
beam contact
Damaged, bent, worn, or cracked
suspension component(s)
Replace damaged component
Cross tube bent or missing
Replace cross tube
Loose or worn saddle hex bolts
Replace saddle hex bolts, inspect mating components
Saddles not center on equalizing beam
Center saddles on the equalizing beam
Saddles not center on center bushing
Replace center bushing