Genie M-4700 User Manual download pdf (Page 24)

TO SHORTEN CHAIN RAIL LENGTH:

■ Loosen chain tension as much as possible.

■ Remove screws from sprocket holder and rail end-stop.

■ Slide chain and all rail parts out of rail from header end.See

rail exploded view, Fig. 55 on p. 25, for disassembly details.

■ Measure and cut off excess rail from header end by 1”

increment only.

■ Disassemble connector to expose free ends of chain.

■ Using the same measurement as the excess rail length,

remove the same amount off chain links and chain straps

from BOTH free ends of the chain (Fig. 53).

■ Using rail end-stop as a guide, mark and drill two 3/16"

holes on rail sides for rail end-stop screws.

■ Reassemble two piece connector and slide chain and all

rail parts into rail from header end according to original

assembly.

■ Tension chain properly (Fig. 52).

■ Before installing rail overhead, check for proper assembly

and operation by manually moving trolley up and down

rail length with trolley connected to chain.

Chain Link

Chain Strap

1”

Fig. 53

Your preassembled rail comes with the tension adjusted to

factory specifications. There should be no need for further

adjustment. However, if exposed or subjected to unusually

harsh operating conditions, the tension may need to be

readjusted during the life of the opener.

CHECK PROPER

TENSION (FIG. 52):

■ Release trolley from belt or chain, then examine the set-

ting of the tension adjustment at the header end of the

rail.

■ Proper tension is set when the tension nut is tightened

just enough so that the washer will be spaced approxi-

mately 1mm or 3/64" from the stationary rail end-stop

arch.

■ If the gap between the washer and the rail end-stop arch

is too big or too small, the tension needs to be adjusted.

ADJUST THE TENSION:

■ To increase the tension and tighten the belt or chain, turn

the tension nut clockwise with 7/16” wrench until the

washer is spaced properly from the rail end-stop arch. See

Fig. 52.

■ Once the washer is spaced correctly, any additional

tightening will overtighten the belt or chain and may

cause damage to the system.

■ To loosen the tension, turn nut counterclockwise.

■ Reattach trolley.

FOR PROFESSIONAL INSTALLERS ONLY

If your particular installation calls for a shorter rail than the

standard length provided, it is possible to shorten the rail.

NOTE: Shortening rail too much may result in door travel

length reduction and door not opening fully. This depends

on door size and configuration. Carefully plan all such

modifications before proceeding. THIS PROCEDURE SHOULD

BE PERFORMED ONLY BY A PROFESSIONAL INSTALLER FULLY

FAMILIAR WITH THIS TYPE OF OPENER SYSTEM.

TO SHORTEN BELT RAIL LENGTH:

■ Loosen belt tension as much as possible.

■ Remove screws from sprocket holder and rail end-stop.

■ Slide belt and all rail parts out of rail from header end. See

rail exploded view, Fig. 54 on p. 25, for disassembly details.

■ Measure and cut off excess rail from header end.

■ Disassemble connector to expose free ends of belt.

■ Using the same measurement as the excess rail length, cut

the same amount off BOTH free ends of the belt.

■ Using rail end-stop as a guide, mark and drill two 3/16"

holes on rail sides for rail end-stop screws.

■ Reassemble belt connector, and slide all rail parts into rail

from header end according to original assembly.

■ Tension belt properly.

■ Before installing rail overhead, check for proper assembly

and operation by manually moving trolley up and down

rail length with trolley connected to belt.

14. RAIL LENGTH ADJUSTMENT

13. TENSION ADJUSTMENT

Rail End Stop

(Header End)

Tension

Nut

Proper Space (1mm or

approximately 3/64”)

Proper Tension Adjustment

Washer

Roller Holder Assembly

Fig. 52

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Genie M-4700 User Manual Page 24

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