Door operator equipment if provided, should be closely checked for broken or worn parts. The
door operator is subject to much physical abuse because of its constant operation. Leaking or
exposed lubrication is usually associated with a developing problem such as deteriorated seals or
enlarged openings resulting from wear. The condition should be closely checked. Good
housekeeping on the door operator and associated equipment is essential to reduce wear.
4.2.3 Car Enclosure
Determine that the car enclosure is structurally sound and is securely fastened. Determine that
capacity plates and any required certificates are posted in the car. Report any evidence of
alterations or additions to the car which have materially changed the car weight. Examine
lighting fixtures to determine whether they are securely fastened, and have the required
protection. Determine that sufficient illumination is provided.
4.2.4 Operating And Control Devices
All operating and signalling devices should be operating properly. The signalling devices are
important to the dumbwaiter operation because they are designed to project operating
information for the purpose of expediting material traffic movement. Examples of this
information are: where is the car in the hoistway; was your call registered; has the car arrival
been announced, etc. Also, is the dumbwaiter made to function by applying continuous pressure
on the operating buttons, operate the car in each direction by means of the operating buttons or
other devices to determine that they do not stick or bind? Are they properly marked? Does the
car stop when released? When an automatic leveling device is provided, the accuracy of
stopping in both directions of travel should be noted at landings to determine whether any
readjustments are necessary. If the dumbwaiter function is automatic, establish calls to operate
the car, making stops in both the up and down direction. At each stop, note the relation of the car
platform sill to the landing sill. Note any tendency of operating push buttons to stick. When an
automatic leveling device is provided, the accuracy of stopping in both directions of travel should
be noted at landings to determine whether any readjustments are necessary.
If provided, examine the nuts and cotter pins at the top and bottom of the rods and the frame
rods to determine if they are in place and that filler weights are securely held in place. Determine
that the counterweight guide shoes are securely fastened to the frame and that the guiding
members are not worn excessively.