PAGE 56 — MAYCO LS450 CONCRETE PUMP • OPERATION MANUAL — REV. #2 (02/23/21)
TRAILER MAINTENANCE
Follow the steps below to disassemble the wheel hub and
service the wheel bearings. See Figure 65.
Figure 65. Wheel Hub Components
1. After removing the dust cap, cotter pin, spindle nut and
spindle washer, remove the hub to inspect the bearings
for wear and damage.
2. 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.
3. Replace seals that have nicks, tears or wear.
4. Lubricate the bearings with a high-quality, EP-2
automotive wheel bearing grease.
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.
1. Turn the hub slowly, by hand, while tightening the
spindle nut until you can no longer turn the hub by hand.
2. 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.
3. Install a new cotter pin through the spindle nut and axle.
4. 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.)
WHEEL
HUB
BEARING
CUP
BEARING
CUP
BEARING
BEARING
OIL
SPINDLE
NUT
SPINDLE
WASHER
COTTER
PIN
CAP
LUG
NUT
DANGER
NEVER crawl under the trailer unless it is on firm and
level ground, resting on properly placed and secured
jack stands.
The possibility exists of the trailer falling, thus causing
equipment damage and severe bodily harm or even
DEATH!
DANGER
When performing trailer inspection and maintenance
activities, you must jack up the trailer using jacks and
jack stands.
When jacking and using jack stands, place them so as
to clear wiring, brake lines, and suspension parts (i.e.
springs and torsion bars). Place jacks and jack stands
inside 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. Otherwise,
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 deformation.
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