23
INSPECTION POINTS
EC4 SERIES HOISTS
Table 6
Section
Check points
Proper sondition
Body
External view
No crack of deformation
Abnormal sound
Motor and other parts sound normal.
Side-plates
No wearing deformation
Gears and bearings
No wearing and crack. Well lubricated with
grease
Load sheave
No wearing and crack
Hooks
Opening
Same as recorded dimension “A” for new
hook.
Holders
No crack and deformation.
Bottom swivel hook
Rotates smoothly on a thrust ball bearing.
Rivets for holder
No wear or deformation
Load chain
Dimensions
Refer to the table 10.
Visual condition
No rust, cracks, wear or deformation
Lubricant
Gear teeth
Sufficient grease
Load chain
Well lubricated with machine oil along the
whole length, particulary at the contact
points.
Limit mechanism
Limit switch
Motor stops when handle is pushed up.
Test lifting and lowering without a load
Stop - holder
Bolts and nuts firmly tightened. No crack.
Brake mechanism
Brake
The brake must function positively. When
the rated load is lifted, the amount of slip-
page of the brake must be within 1 % of
the distance the hoist can lift in 1 minute
(Refer to the “Lifting speed”on Page 6-10.)
Electrical components
Power source cable and pendant control
cable.
No breakage and damage of the rub-
ber-covered cables. No disconnection.
Push-button switch
Contact points functioning positively.
Switch box
Limit switch, electromagnetic contactor
functioning correctly.
Motor
No humming and over-heating.
Insulation resistance
lnsulation resistance exceeds 2M Ω by DC
500V Megger.
Others
Bearings
Properly and smoothly engaging with
shafts.
Chain collecting bucket
Inside of the chain bucket free of rust, dirt,
grease and other foreign matter.
Balts, nuts, etc.
All in good condition and securely in
position.
Name-plate (mark-plate)
Clearly observable.
