8
Twin Hook Electric Chain Hoist Inspection Items
Items
Inspection
period
Inspection method
Criteria
When failed
Daily Periodic
Appearance
○
○
- Visual check
- There is no damage,
deformation, or remarkable
corrosion.
- The unit is not tilted (the
balance weight is attached).
Replace damaged parts.
Attach the balance weight.
Limit switch
○
○
- Check the operation with no
load.
- Make sure that the hook stops
at the upper-limit and can be
lowered.
Contact your dealer.
Position of bottom
hook
○
○
- Visual check
- Even and accurate in position Adjust the height.
Bolts and nuts for
frame F/M
○
○
- Visual check
- There is no loose or dropped-
out bolt or nut.
Fasten securely.
Each hole of frame
F/M
○
- Measurement using a slide
caliper
- The amount of wear is 5% or
less (the difference between
vertical and horizontal
diameters of each hole is 5%
or less).
Replace damaged parts.
Chain guide
○
- Visual check
- There is no remarkable
damage, deformation, or wear.
Replace damaged parts.
Nut for screw fitting
○
○
- Visual check
- There is no loose or dropped-
out nut.
- The screw section can be
checked from the check hole.
Fasten securely.
Suspender
○
- Measure the hole diameter
using a slide caliper.
- The amount of wear is 5% or
less (the difference between
vertical and horizontal
diameters of each hole is 5%
or less).
Replace damaged parts.
Idle sheave
○
○
- Visual check
- Daily inspection: Operation
with no load
- Periodic inspection: Operation
with a rated load
- Sufficiently lubricate.
- Smoothly rotating without
irregular sound.
Lubricate through the grease
nipple.
Replace damaged parts.
