Front Idler
Wall Mount
Trolley
Center Idlers
Hex Nut
PREPARATION
LDT, LDTB 3
Track Assembly
1. Using the center idlers and the front
idler, assemble the operator rail by install-
ing the idlers between the rails. Use the
hex nuts on the outside and fasten them
tight. The front idler should be installed in
the second hole. The center idlers should
be spaced evenly over the length of the
track.(Figure 1)
2. Slide the trolley carriage onto the rail
so that the emergency disconnect bracket
will be toward the operator.
Operator Attachment
1. Position the track assembly on the
frame of the operator so that the motor
side is in the back (away from the door).
2. Align the holes in the rail with the holes
in the operator and install four 5/16 bolts
(two per side).
3. Install hex nuts on the bolts and tighten
to secure the operator to the rail.
Chain Installation
1. With the trolley engaged in the chain tensioner, use a master link to attach one end of the chain to
the chain tensioner.
2. Route the chain around the front idler sprocket and the drive sprocket on the operator and back to
the other side of the chain tensioner. (Ensure the chain rides across the top of all center idlers pres-
ent)
3. Connect the free end of the chain to the chain tensioner using another master link.
4. Disengage the chain tensioner from the trolley using the emergency disconnect and slide the trol-
ley out of the way (Figure 2).
5. With the lock nut loose, tighten the chain by turning the main body of the chain tensioner. When
desired tension is reached, tighten the lock nut. (If necessary, remove links from the chain to achieve
proper adjustment.)
Chain Tensioner
Trolley
Roller Chain
Straight Arm
Lock Nut
Master Link
FIGURE 2
FIGURE 1
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