(pressure ), loosen both set screws and turn both adjusting
bolts one-half turn counterclockwise. Tighten both set
screws and bend one piece of conduit to test the adjustment.
If side marking still occurs, repeat the procedure.
NOTE: Both adjusting bolts must be in contact with
bender frame.
12.0 MAINTENANCE INSTRUCTIONS
12.1 GEAR BOX OIL
Always disconnect power supply before removing any
guards or covers and before servicing this bender.
Failure to do so may result in serious injury or death.
The Gear Box is filled with oil at the factory and should not
require periodic flushing. If the Gear Box is opened for repair,
flush with a light SAE #10 oil then run unit with no load for 3
minutes. Then, drain and refill the unit with 28 fluid ounces of
gear oil from the following list :
Amoco - Amoco Worm Gear Oil
Chevron - Cylinder Oil 460X
Exxon - CYLESSTIC TK460
Mobil - 600 W Cylinder Oil
Shell - Sun Gear Oil 7C
12.2 CHAIN TENSIONER # 60 CHAIN (FRONT)
To adjust front (# 60 Chain) Tension:
1. Remove front cover plate.
2. To increase tension on chain, loosen nut “A” and tighten nut “B”
3. To decrease tension on chain loosen nut “B” and tighten nut “A”
12.3 CHAIN TENSIONER # 40 CHAIN (REAR)
To adjust front ( # 40 Chain ) Tension:
1. Loosen 8 bolts (4 on top and 4 on bottom) that hold the gear
box in position.
2. To tighten, move the gear box to the left and re-tighten bolts.
3. To loosen, move the gear box to the right and re-tighten bolts.
NOTE: Be sure to keep the gear box and motor in line with
the bender.
13.0 STUB-UP BENDING INFORMATION AND
CHARTS
To locate bending marks and springback of 15, 30, 45, 60,
and 90 degree bends for a desired stub:
1. Check chart A, B, or C for deduct length. Note that
minimum stub length is deduct length plus 2".
2. Measure and mark desired stub length on conduit (stub
length mark). Subtract “Deduct Length” from this mark and
make a second mark (bending mark). Place bending mark
at front edge of shoe hook. Check chart A, B, C for spring
back of desired degree of bend. Bender should be
advanced to this degree to obtain desired degree of bend.
NOTE: Springback figures are approximate. Minimum stub
length = deduct plus 2".
A
B
Figure 23. Front View - Tension Adjustment
Place Bending Mark in line with front edge of shoe hook
Stub Length Mark
Bending Mark
Stub Length
Chart A - Rigid Conduit/Schedule 40 Steel Pipe
Conduit
Deduct
Springback
Size
Length
15°
30°
45°
60°
90°
1
⁄
2
"
8
1
⁄
2
"
20"
36
1
⁄
4
" 51
1
⁄
4
" 67
1
⁄
2
" 97
1
⁄
2
"
3
⁄
4
"
8
1
⁄
2
"
16
1
⁄
4
" 31
1
⁄
4
" 46
1
⁄
4
" 61
1
⁄
4
" 92
1
⁄
2
"
1"
10"
17
1
⁄
2
" 32
1
⁄
2
" 47
1
⁄
2
" 63
3
⁄
4
" 93
3
⁄
4
"
1
1
⁄
4
"
12
3
⁄
4
"
17
1
⁄
2
" 32
1
⁄
2
" 47
1
⁄
2
" 63
3
⁄
4
"
95"
1
1
⁄
2
"
14
1
⁄
4
"
18
3
⁄
4
" 33
3
⁄
4
" 48
3
⁄
4
"
65"
95"
2"
16
1
⁄
8
"
20"
35"
48
3
⁄
4
" 63
3
⁄
4
" 96
1
⁄
4
"
Chart B - EMT Conduit
Conduit
Deduct
Springback
Size
Length
15°
30°
45°
60°
90°
1
⁄
2
"
7"
16
1
⁄
4
" 32
1
⁄
2
" 47
1
⁄
2
" 63
3
⁄
4
"
95"
3
⁄
4
"
8
7
⁄
8
"
17
1
⁄
2
" 33
3
⁄
4
" 48
3
⁄
4
" 63
3
⁄
4
"
95"
1"
10
3
⁄
4
"
17
1
⁄
2
" 32
1
⁄
2
" 48
3
⁄
4
"
65"
95"
1
1
⁄
4
"
13
1
⁄
8
"
17
1
⁄
2
" 33
3
⁄
4
" 48
3
⁄
4
"
65"
95"
1
1
⁄
2
"
13
7
⁄
8
"
16
1
⁄
4
" 31
1
⁄
4
" 46
1
⁄
4
" 61
1
⁄
4
" 92
1
⁄
2
"
2"
15
3
⁄
8
"
17
1
⁄
2
" 33
3
⁄
4
" 48
3
⁄
4
" 63
3
⁄
4
"
95"
Figure 24. Stub-up Bending Markings
Stub Length Mark
Bending Mark
Stub Length
Deduct Length
8
