Harrington Hoists and Cranes TNER Theater Hoist - Manual (Page 23)

Table 5-3 Hoist Inspection Methods and Criteria
Item Method Criteria Action
Bolts, Nuts and
Rivets Visual, Check
with Proper Tool Bolts, nuts and rivets should not be loose. Tighten or replace
as required.
Motor Brake Measure, Visual Motor brake gap should be adjusted to the
distance shown in Table 6-1 before measuring
the brake wear. Brake lining dimension “A”
should not be less than discard value listed in
Table 5-6. Refer to Section 6.2 for gaining
access to motor brake and for adjustment and
inspection procedures. Braking surfaces should
be clean, free of grease/oil and should not be
glazed. Adjust, Repair or
Replace as
required.
Contactor Contacts Visual Contacts should be free of significant pitting or
deterioration. Replace.
Load Sheave Visual Pockets of Load Sheave should be free of
significant wear. Replace.
Pendant – Switches
(Optional)
Function Depressing and releasing push-buttons should
make and break contacts in switch contact block
and result in corresponding electrical continuity or
open circuit. Push-buttons should be interlocked
either mechanically or electrically to prevent
simultaneous energization of circuits for opposing
motions (e.g. up and down). Repair or replace
as necessary.
Pendant - Housing
(Optional)
Visual Pendant housing should be free of cracks and
mating surfaces of parts should seal without gaps. Replace.
Pendant - Wiring
(Optional)
Visual Wire connections to switches in pendant should
not be loose or damaged. Tighten or repair
Pendant - Cord Visual, Electrical
Continuity Surface of cord should be free from nicks,
gouges, and abrasions. Each conductor in cord
should have 100% electrical continuity even when
cord is flexed back-and-forth. Pendant Cord
Strain Relief Cable should absorb all of the load
associated with forces applied to the pendant. Replace.
Pendant - Labels Visual Labels denoting functions should be legible. Replace.
Warning Labels Visual Warning Labels should be affixed to the hoist (see
Section 1.2) and they should be legible. Replace.
Hoist Capacity Label Visual The label that indicates the capacity of the hoist
should be legible and securely attached to the
hoist. Replace.
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