Bishamon NSA3500N, Operation And Service Manual

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26
11-3 Arm Restraint devices
1. Bring the lift to the lowest position to
ensure that the restraint devices are
unlocked, allowing the four swing
arms to swing around smoothly.
⇒
If the restraint devices are not
unlocked, adjust to give 1 to 2 mm
clearance (“A” in right figure) to
the lock rods with the carriages at
the lowest position.
2. Raise the lift by 50 mm or more to ensure that the restraint
device lock gears are meshed with the lock pieces,
preventing the four swing arms from swinging around.
⇒
If the lock gears and the lock pieces are not meshed
well, the cause may be a worn part(s) or poor
adjustment. Replace the part(s) or adjust the mesh
between the lock gear and the lock piece. Adjust the
adjusting nut as per the right figure.
3. Check the tightness of the mounting screw for the swing
arm lock gear.
11-4 Main post-side lowering stopper
1. Raise the lift to ensure that the lowering stop hook
is “engaged,” making a rattling noise.
(Daily check item)
2. Disengage the hook control lever to lower the lift to
the lowest position. Then, ensure that the chain is
slackened to “engage” the lowering stop hook.
3. If the chain fails to hold itself under no load
condition, the cap bolt or the safety spring may
be worn and should be replaced immediately.
Leaf chain
Cap bolt
Safety spring
Hook return spring
Hook release lever
When the chain is broken
Replace every
four years
Lock gear
Mounting screw
Centerline of the lock gear
The fulcrum is
below the
centerline.
The lock gear is
meshed with the lock
piece.
Adjusting nut
Unlocking
operation
Swing stopper
release lever
Lock piece
Lock rod
A
A
“Disengage”
“Engage” “Engage”
When the hook is released