maintenance — TRAILERS
After removing the dust cap, cotter pin, spindle nut and spindle washer, remove the hub to inspect the bearings for wear and damage.
Replace bearings that have flat spots on rollers, broken roller cages, rust or pitting. Always replace bearings and cups in sets. The inner and outer bearings are to be replaced at the same time.
Replace seals that have nicks, tears or wear.
Lubricate the bearings with a high quality
Wheel Hub Adjustment
Every time the wheel hub is removed and the bearings are reassembled, follow the steps below to check the wheel bearings for free running and adjust.
Turn the hub slowly, by hand, while tightening the spindle nut until you can no longer turn the hub by hand.
Loosen the spindle nut just until you are able to turn it (the spindle nut) by hand. Do not turn the hub while the spindle nut is loose.
Install a new cotter pin through the spindle nut and axle.
Check the adjustments. Both the hub and the spindle nut should be able to move freely (the spindle nut motion will be limited by the cotter pin).
DANGER
NEVER crawl under the trailer unless it is on firm and level ground and resting on properly placed and secured jackstands.
The possibility exists of the trailer falling thus causing equipment damage and severe bodily harm even death!
DANGER
When performing trailer inspection and maintenance activities, you must jack up the trailer using jacks and jackstands.
When jacking and using jackstands, place them so as to clear wiring, brake lines, and suspension parts (i.e., springs, torsion bars). Place jacks and jackstands inside of the perimeter strip on the supporting structure to which the axles are attached.
DANGER
Improper weld repair will lead to early failure of the trailer structure and can cause serious injury or death.
DO NOT repair cracked or broken welds unless you have a certified welder perform the repair. If not, have the welds repaired by your dealer.
WARNING
If the trailer is involved in an accident, have it inspected immediately by qualified personnel. In addition, the trailer should be inspected annually for signs of wear or deformations.
Leaf Suspension
The leaf suspension springs and associated components (Figure 18) should be visually inspected every 6,000 miles for signs of excessive wear, elongation of bolt holes, and loosening of fasteners. Replace all damaged parts (suspension) immediately.
Figure 18. Leaf Suspension Components
DANGER
Worn or broken suspension parts can cause loss of control, damage to equipment and severe bodily injury, even death!
Check suspension regularly.
page 26 — MLT25 sERIES LIGHT TOWER • operation manual — rev. #0 (11/28/12)