1-800-409-5438
1
From the first floor, open the hoistway door and motor access
panel / door.
(see Figure 7)
2
Through the motor access panel / door open the controller and
use the
“Up” contactor to move the dumbwaiter car up until the
bottom of the car is approximately 6 feet above the floor.
(see Figures 7, 9 & 10)
(see Page 14 for Contactor Operation)
3
Disconnect A.C. power from dumbwaiter.
4
Verify that both the front and back chains are taught at chest
height.
(see Figure 7)
If there is any slop in the chain
continue on to the next step. If the chains are both taught go
on to
Step 6
.
5
Using two 9/16” wrenches (15/16” for MJ-500 model), back
lock nut off and then tighten down adjustment nut until chain is
taught. Once chain is taught use a blade screwdriver or
needle nose pliers to hold the chain from twisting and tighten
lock nut up to adjustment nut securely.
(see Figure 8)
NOTE:
Do not overtighten the chain. If the chain slaps
during operation of the dumbwaiter, the chain is
too tight.
6
Reconnect A.C. power to the dumbwaiter.
7
Close hoistway door and motor access and use the push
buttons to send the dumbwaiter car to a floor.
If you have any questions, concerns, or
problems please do not hesitate to call us.
Checking & Adjusting Chain Tension
MAKE SURE A.C. POWER IS DISCONNECTED FROM
DUMBWAITER WHILE SERVICING!! YOU MUST ACCESS THE
CONTROLLER THROUGH THE MOTOR ACCESS PANEL/DOOR!!
FAILURE TO DO SO COULD DAMAGE THE DUMBWAITER
AND/OR CAUSE SERIOUS BODILY INJURY, LOSS OF LIMB, OR
DEATH!
WARNING
Figure 8
Adjustment
nut
Lock nut
F
ir
s
t f
loo
r
ho
is
twa
y
do
or
Mo
tor
ac
c
es
s
Adjustment
nut
Dumbwaiter
Car
#4
Check
chains here
Figure 7
Controller
Figure 10
Dynamic Brake Contactor
Press here
Figure 9
Standard Contactor
Press here
