SAFETY
Control of Hazardous Energy
12
MA-1055-107
03 Rev. 9/07
Mast
Blocking Masts
Use 100 x 100 mm (4 x 4 in) or bigger hardwood blocks
of appropriate length for supporting mast channels.
Block both mast rails of each stage to maintain stability.
Remove any carriage mounted accessory (i.e., carton
clamp, etc.) except sideshifters before blocking masts.
These accessories add significant weight to the mast.
• Move truck to a secure non-traffic maintenance
area with a level floor.
• Chock wheels (refer to Lifting and Blocking in this
section).
• Connect battery.
• Raise forks and position blocks under second
stage mast as shown.
• Using a clamp or ratchet tie down, secure blocks to
mast channel as shown.
• Lower mast and position appropriate length blocks
under third stage mast as shown.
• Lower mast and position appropriate length block
under fourth stage mast (or inner) on quad mast as
shown.
• Using a clamp or ratchet tie down, secure blocks to
mast channel or second stage block as shown.
• Lower fork carriage until carriage rests on stops or
place blocks under carriage and lower until weight
rests on blocks.
• Lockout or tagout truck as described in Lockout -
Tagout in this section.
Figure 16930-01
a
TT Mast e Third Stage Mast
b
Quad Mast f Fork Carriage (Shown Raised Slightly for Clarity)
c Second Stage Mast g Fourth Stage Mast (or Inner)
d First Stage Mast (Mainframe or Outer Mast)
Crown 2006 PF15396-8 Rev. 9/07
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