Chapter 8 – Prestart Inspection
TM12 – 8210027 21
3. Release the knob to stop.
4. Make certain the knob is fully released after lowering
the platform.
Structures
Visually inspect all weldments and related components.
It is important to inspect the fasteners that connect the
components.
Weldments
To inspect the weldments:
1. Visually inspect all weldments for abnormal wear,
abrasion, or deformation that could cause interfer-
ence between moving parts.
2. Inspect the welds on the structural components.
Pay particular attention to boom welds. The area to
be inspected should be clean and free of dirt and
grease.
3. Look for visible cracks in the welds and at the weld
to parent material joints. A bright light may be used
to provide adequate visibility of the inspection area.
Mast Bearings
The mast has front and rear bearings (refer to Figure
8.11) between each section.
Figure 8.11 – Mast Bearings
To inspect the mast bearings:
1. Use the lower controls to fully raise the platform.
2. Visually inspect the bearings to make sure they are
securely fastened in position.
3. Inspect the surface where the bearings contact the
mast sections. The paint must be in place with no
signs of bare metal.
Fasteners
To inspect the component fasteners:
1. Visually inspect all fasteners to see that none are
missing or loose.
2. Inspect all of the bolts, nuts, rollpins, collars, and
snap rings. They should all be present, tight, and not
damaged in any way.
Upper Control Station
Inspect the platform and upper controls, after verifying all
functions operated properly from the lower controls.
Guardrail System
The guardrail system includes (refer to Figure 8.12):
• A top rail
• A mid rail
• Chain entry gate
• Toeboards around the sides of the platform.
Figure 8.12 – Guardrail System
To inspect the guardrail system:
1. Visually inspect all components of the guardrail
system. Make sure the rails and toeboards are all in
place and free of any damage or deformation.
2. Visually inspect the rail and toeboard welds for
cracks.
3. Visually inspect all bolts and nuts fastening the plat-
form in place. They must be present and not show
any signs of looseness.
4. Inspect the entry chain to be sure it is present and
securely fastened to the rail. The chain must be free
of damage and deformation that may prevent it from
functioning properly. Inspect the hook and eye that
secures the chain to the rail.
Mast Bearings
Top Rail
Mid Rail
Entry Chain
Lanyard Anchors
Toeboard
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