Greenlee Textron - Greenlee 855 Instruction Manual

Bender Head Disassembly (cont'd)
CHAIN
If chain breaks, replace with new chain (905 4250.9)
(not another Master Link). This is due to the high stress
on the chain. The addition of a second Master Link will
only weaken the chain further. If the Master Link breaks,
it can be replaced with a new Master Link (905 4251.7).
1. Remove four screws securing top cover and remove
top cover.
2. Remove 1-1/2" to 2" shoe (see shoe removal).
3. Remove seven screws securing front guard and
remove guard.
4. Remove nine screws securing motor cover and
remove motor cover.
5. Rotate motor until chain master link is accessible at
top of bender.
6. With the bender head in the horizontal position,
loosen the four bolts and nut securing the motor and
turn the eccentric adjusting bolt to allow chain slack.
7. Tap the motor toward the spindle to slack the chain,
taking care not to allow the encoder to contact the
frame.
8. Remove cotter pins, master link and chain.
9. Reassemble in reverse order, noting the following:
• Torque eccentric adjusting bolt to 81 Nm (60 ft-lb)
while tightening two front bolts and nut to maintain
chain tension.
• Use new master link and cotter pins.
SPINDLE
1. Remove chain (see chain removal).
2. Remove 1/2" to 1-1/4" shoe (see shoe removal).
3. Loosen 1/2" to 1-1/4" drive plate hub set screw.
4. Remove socket head screw in 1/2" to 1-1/4" spindle.
5. Remove drive plate and key.
6. Use a file to remove any raised edges from the
spindle to prevent bearing damage.
7. Remove spindle/sprocket.
8. Reassemble in reverse order.
LIMIT SWITCH BRACKET
1. Remove spindle (see spindle removal).
2. Remove four screws securing two limit switches and
remove switches.
3. Remove two screws securing bracket and remove
bracket.
Greenlee Textron / Subsidiary of Textron Inc.
855 Smart Bender™
4. Reassemble in reverse order, noting the following:
• Limit switch with red wires goes on top.
• Install top switch so that trip roller is as far left as
possible, as viewed with the switch behind the
bracket.
• Install bottom switch (black wires) with the trip
roller as far right as possible, as viewed with the
switch behind the bracket.
• Temporarily install both shoes before installing
chain.
• Place 2" IMC in bender and rotate shoe until
conduit locks up against tail roller. (DO NOT raise
support rollers as is normal for IMC.)
• Slide top limit switch until contacts trip and tighten
in that position.
• Place 1/2" rigid in bender and rotate shoe until
conduit locks up against support roller.
• Slide bottom switch until contacts trip and tighten
in that position.
• Rotate spindle, checking that the limit switch trip
bolts do not snag the trip rollers. Re-adjust
bracket mounting if necessary.
1-1/2" and 2"
Limit Switch
Adj. Screws
Less Bend
If the accuracy of all sizes of conduit on one shoe is
off in the same direction, the limit switch needs to be
adjusted. To do so, first unplug the bender. Remove the
four screws that secure the top round guard and remove
the guard to expose the two limit switches. The top
switch controls the 1-1/2" to 2" shoe. Loosen the two
screws and move it to the right side of the bender
(as shown above) to prevent overbending. The bottom
switch controls the 1/2" to 1-1/4" shoe. Loosen the two
screws and move it to the left side of the bender (as
shown above) to prevent overbending. Move either
switch the opposite direction if the bender is under-
bending. Every 1/8" of switch movement approximates
1 degree of change. Tighten the screws and replace the
guard.
36 4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
Less Bend
1/2" to 1-1/4"
Limit Switch
Adj. Screws