24
11-1 Leaf chain
1. Lubrication
Check the surface for tear or for any red or dark brown portion.
⇒
Apply lubricant.
(Recommended type of oil: lubricant (oil) with viscosity of SAE 30 to 40)
2. Plate check
Check plates for cracks in hole rims or side faces.
⇒
If any crack is detected, replace the chain.
3. Pin check
Check pins for rotation.
⇒
If any rotation is detected, replace the chain.
4. Elongation check
Ensure that the chain has an elongation of 2
percent or less.
Using vernier calipers as per the right figure,
measure the outer and inner lengths L1 and L2
between the outermost pins in the section where
the chain bends over the chain wheel. Then,
obtain the determining length L = (L1 + L2)/2.
1-link length
6-link length
Limit
determining
length
Drive chain (chain above cylinder)
25.4 mm
152.4 mm
155.5 mm
Driven chain (chain between posts)
19.05 mm
114.3 mm
116.5 mm
⇒
If the elongation is 2% or more (equal to or greater than the limit determining length), replace the
chain.
In principle, replace the chain every four years or when used more than 8,000 times.
Contact your dealer for chain replacement.
L1
L2
Obtain the measured length of
six links.
Even before the end of the replacement interval, replace the chain immediately if battery
fluid is spilt on it or if any rust, bend, or crack is detected on it. If any anomaly is detected,
prohibit the use of the lift. Resume use only after the anomaly is fully repaired.
Warning
Places to be cracked
easily
Normal
Rotation
