56
ED250
01-2018
DL4614-080
dormakaba ED250 IG Service Manual
Chapter 21
1
3/8" thick pad
2
Plate for pad
3
3/8" hex nut
4
Chain tension nut
(3/8" x 1 1/4" hex
standoff)
5
3/8" x 2" long
threaded stud
6
Gearbox side
1
BHSCS (Flanged
button head socket
cap screw)
2
Operator mounting
main extrusion
3
Spacer plate
4
1/4" x 5/8" FHCS
(flanged head cap
screw) and washer)
21.1 Cement case chain tension
Fig. 21.1.1 Operator mounting screws
Fig. 21.1.2 Chain tensioning adjustment
Fig. 21.1.3 Hex nuts loosened for chain
tensioning
Fig. 21.1.4 Hex nuts tightened after
adjustment
1
2
3
3
5
4
6
3
3
4
5
21.1.1 Check chain tension.
Chain tension is set for a 3/8" deflection in
chain when squeezed together.
Chain tension adjustment is accomplished
by adjusting chain tension nut (
4
) on a
threaded stud. This moves ED250 operator
toward or away from spindle drive,
loosening or tightening chain.
21.1.2 Chain tension adjustment
procedure.
1. Loosen four 1/4" x 5/8" FHCS (
4
) and
three BHSCS (
1
) that secure operator to
spacer plate (Fig. 21.1.1).
2. Loosen both 3/8" hex nuts (
3
) on
threaded stud (Fig. 21.1.2).
3. Adjust chain tension nut
(4
) CCW to
tighten chain or CW to loosen chain until
3/8" deflection in chain when squeezed
together (Fig. 21.1.3).
4. Tighten both 3/8" nuts (
3
) against
gearbox side (Fig. 21.1.4).
5. Retighten operator mounting screws
loosened in step 1 to secure operator
against spacer plate.
3
3/8" hex nut
4
Chain tension nut
(3/8" x 1 1/4" hex
standoff)
5
3/8" x 2" long
threaded stud
4 4
1
1
1
4
4
2
3
21 Cement case spindle and chain
4
3
5
3
