Martin Sprocket & Gear Bucket Elevator Safety - Manual (Page 8)

4
Installation
MC. Adjust take-up accordingly to provide 1/8” to 1/4” gap between the chain barrel and root of boot sprocket tooth. This gap should
occur at 6 o’clock on the boot sprocket.
The gap is to accommodate chordal action of the chain.
On long pitch chain this gap can be increased accordingly.
Adjust bibb to provide up to 3/4” to 1” clearance to buckets.
NC. At this point you may find it desirable to “run in” the chain for a period of several hours.
OC. Install buckets using bolts, nuts and lock washers provided. It is a good idea to peen the bolt threads after the buckets are
securely in place.
If plastic buckets are being installed, use care to avoid over tightening. Steel backups may be required.
PC. Adjust bibb to provide 3/4” to 1” clearance to buckets. Install upper hood front and back sections.
QC. After satisfactory alignment and trial operation, weld stops at each end of head shaft pillow blocks to prevent bearing move-
ment. Stops may be of angle iron channels, key stock, etc.
NOTES (Chain Type)
AA. If elevator is equipped with gravity type take-up, use a come along or other means to raise takeup box to the upper most por-
tion when coupling the chain together.
Add weight (concrete or steel stampings) to weigh box as required for smooth operation. Weight must be uniformly distrib-
uted in weight box.
Boot sprockets will fully engage the chain, however, insure that upward movement is available to accommodate chordal action
of chain. Usually 2 to 3 inches is adequate.
BB. When installing double strand chain elevators be sure to lay out chains and verify equal lengths of parallel strands.
Double strand chains are usually matched and tagged left and right.
CC. On double strand elevators, one boot sprocket is keyed to the shaft, the other sprocket floats between shaft collars. Insure that
these collars are tight.
Check shaft collars frequently for tightness. After all plumbing and other adjustments are made, it may be necessary to drill a
set screw indent into boot shaft to hold shaft collar position.
DD. During~normal operations, avoid starting and stopping any elevator when loaded with material.
EE. If elevator components are to be stored at the job site for some time prior to erection, insure that components are protected
from elements.
It is not advisable to cover elevator components tightly with polyethylene. Condensation will collect and cause corrosion and
premature motor failure.
FF. If elevator is to be erected but not used for a long period of time, it is advisable to run the elevator at least one hour per week.
MACHINERY (Belt Type)
IB. Remove boot pulley access door.
Drop a plumb line from head end pulley to boot pulley.
Insure that pulleys are centered in casing and are exactly in line with each other.
Check to insure that the pulley set screws are tight.
Pulleys should be in line when viewed from the narrow side of the casing.
Head and boot shafts are generally offset when viewed from the wide dimension of the casing.
Check factory drawings for offset.