8
PUB. NO. DFNDRB JANUARY 2013
DEFENDER
™
MOTOR / LIMIT SWITCH INSTALLATION
Limit switch sprocket.
If removed, torque to 75 in/lbs
Do not force the unit on by hitting with a hammer. Unit
will fit onto shaft. Check for obstructions and lubricate
more if necessary.
W A R N I N G ! ! !
!
8.1
Step 7:
Install #35 (#25 for encoder) chain onto
sprockets. Apply tension to chain and tighten
limit switch mounting bolts. To adjust the chain,
loosen up the limit switch mounting bracket
bolts and adjust so the chain deflects
approximately 1/4” [6] (retightened to 66 in/lbs).
More than 1/4” [6] may cause wear on the limit
switch shaft bearing assembly. Make sure chain
is tight enough so it does not slip over the teeth.
Step 1:
Apply a grease lubricant or anti-
seize (not supplied) to the drive
shaft to ease installation and
maintenance of gearbox. Slide
gearbox spacer onto shaft.
Step 6:
Install 30 tooth sprocket (15 tooth
used on units >8’ tall) onto the drive shaft
until it hits the shoulder and line up with
the 10 tooth sprocket, may need to loosen
and move the 10 tooth sprocket. Use a
short straight edge to align. When aligned,
tighten the 1/4” [6] set screws onto the flat
spot of the shaft with an 1/8” [3] allen
wrench to 75 in/lbs and lock-tight.
Step 5:
Install Limit switch
assembly with the (3) bolts
supplied to the position that best
fits and torque to 230 in/lbs
Step 2:
Slide gearbox onto shaft.
Turn roller tube to align keyway and insert
key.
The key should slide freely, DO
NOT force, as the key may become
distorted.
Tap key into keyway slot until it
is past the inner most retaining ring slot
and install retaining ring.
Step 4:
Attach chain to the header.
Step 8:
Connect motor cable.
Step 3:
Attach (2) M12 cap screws
for torque arm,
Figure 10.4
.
Rear View of Limit Switch Drive
Front View of Limit Switch Drive
Rear View of Encoder Drive
Front View of Encoder Drive
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