4 — MAINTENANCE
4-11
4-5 LIFT CHAINS AND SLIDE BLOCKS
WARNING
Do not operate a unit on which any chain assembly is damaged or in need of re-
placement. Operating a unit with a damaged chain can cause severe injury or
death to personnel and damage to equipment.
Inspect all lift chains daily. Inspect for signs of wear, split leaves, loose pins, clevis dam-
age, and elongation. Replace any chain which is damaged in any way. Chain assemblies
may be ordered from your dealer or direct from the factory. Do not operate a unit on
which any chain assembly is damaged and in need of replacement.
Chain Elongation Inspection
First Mast Chain (BL-566 Chain)
One pitch of chain should measure 5/8 in. (1,5875 cm). Measure 20 pitches of chain. The
ideal measurement for 20 pitches of chain should be 12.5 in. (31,75 cm). Replace the
chain if 20 pitches measure over 12.75 in. (32,385 cm). Refer to Figure 4-6.
Figure 4-6. BL-566 Chain Elongation Inspection
Second through Sixth Mast Chain (BL-466 Chain)
One pitch of chain should measure 1/2 in. (1,2700 cm). Measure 20 pitches of chain. The
ideal measurement for 20 pitches of chain should be 10.0 in. (25,40 cm). Replace the
chain if 20 pitches measure over 10.25 in. (26,035 cm). Refer to Figure 4-7.
Figure 4-7. BL-466 Chain Elongation Inspection
NOTE: It is recommended that
chains be replaced every four
years unless damage or wear
requires replacement at a lesser
interval.
