188.8.131.52 Inspection Made with Power On. Close the mainline switch and proceed. Excessive
lubrication of the wire ropes or wear of the sheave grooves may result in reduction of traction.
Test traction by marking the ropes and sheave with a chalk line, then operate the empty car in the
up direction and stop it by opening the emergency stop switch. Return the car to the originating
floor and observe. Any material reduction of traction may be noted by observing slippage
between ropes and traction sheaves.
4.3.6 Guards For Exposed Equipment
With the mainline switch closed, check exposed gears, sprockets, tape or rope sheaves or
drums of selectors, floor controllers or signal machines, and the ropes, chains, or tapes for
driving them, in machine rooms and secondary machinery spaces to determine that the required
guards are in place. Many times guards are removed to service equipment and in haste are not
returned to their proper place. A guard sitting off to the side is not doing its job and could result
in a painful accident.
4.3.7 Winding Drum Machine
The A17.1 Code allows the use of winding drum machines for dumbwaiter applications. See
Figure 4-14 for an example of a typical winding drum dumbwaiter machine. open the mainline
switch and examine hoisting and counterweight rope fastenings in the drum. Note that there
would be at least one turn of rope on the drum if the car or counterweight were resting
on its fully compressed buffer. Visually examine and hammer-test the drum for defects or
cracks, as previously described.
4.3.8 Driving Machine Terminal-Stopping Switches
The normal terminal stopping devices for winding drum machines are required to consist of
switches located in the hoistway or on the car, and operated by the movement of the car. Where
the normal terminal stopping switches are located on and operated by the driving machine, they
should be inspected and where possible, operated by hand to determine that the switch and its
contacts are in proper operating condition. Determine that the switch contacts, particularly any
motor mainline contacts provided, are not burned or worn excessively, and that all gears, chains,
or wire ropes and pulleys provided for their operation operate as intended and are not worn
excessively. Close the mainline switch and run the empty car to each terminal landing until
stopped by the machine terminal stopping switch. Note whether the switch stops the car near the
landing. Determine that at the bottom terminal landing with no load in the car, allowance has
been made for the greater slide that could occur when the rated load is in the car.