Enerpac STB-Series - Manual (Page 3)

3
5.0 PIPE BENDING (see Figure 2 and 3)
IMPORTANT: Before starting a bend, be sure pivot pins
are through the bottom frame plate and locked in
position to properly anchor.
When actuating pump, either hand or electric, operator should
position himself on the cylinder side. It is not recommended that
any bender be operated from the front position.
As bend is generated, watch optic angle gauge until desired
angle of bend is reached. Because of pipe springback, it will be
necessary to go a bit beyond the desired angle.
Figure 2
1. Place pipe in bender frame.
2. Attach Optic Angle Gauge to the top of Pivot Shoe, as shown
in Figure 3. A locator pin on the gauge mates with a hole in
the pivot shoe.
3. Mount other Pivot Shoe. Both pivot shoes are marked for
various pipe sizes. The markings on pivot shoes must
correspond to the pipe size being bent and face the pipe.
4. Angle Gauge should now read at zero when read along line
scribed on bender frame.
5. Lock both Pivot Shoes in position with push-button Pivot
Pins. Pivot pin is operated by pushing down on button with
thumb while grasping cross handle. Be sure pivot pins are
inserted through corresponding marked pipe size holes.
6. Turn Pump Valve as shown for manual valve and proceed to
bend. If electric push-button model, push “advance” button
(STB-202 series benders only).
Figure 3, Pipe Bending
6.0 PIPE REMOVAL
Figure 4, Pipe Ejection
6.1 STB-202 Series Pipe Ejection
1. Retract cylinder plunger slightly by turning pump valve in
opposite direction of outward bending stroke. This will take
pressure off pivot shoes and pins. If electric push-button
model, jog retract button.
2. Remove either one or both of the Pivot Shoes and reposition
one Pivot Pin in proper pipe-size “eject hole” where the pin
will restrain the pipe, not the shoe, as they retract. Four inch
one-shot frames have two eject holes. Use both holes.
3. Now fully retract the cylinder plunger. Bending shoe and pipe
will retract together until pipe meets pivot pin. On contact,
pipe will strip from shoe.
4. Remove other Pivot Pin and Pivot Shoe to remove pipe from
bender.
6.2 STB-101/221 Series Pipe Ejection
1. Retract cylinder completely by turning pump valve in
opposite direction of outward bending stroke before
removing pipe from bending shoe.
2. Remove either one or both pivot shoes.
3. Hammer pipe out of bending shoe.
7.0 INSTRUCTIONS FOR 90° STUB-UP ONE-SHOT
Figure 5
L L
S
H
R
H
Hydraulic oil to this hose
Angle gauge
mounts to
pivot shoe
Direction of cylinder
plunger travel
Pivot Pin
Pivot Shoe
Angle gauge – zero lines up with
scribed reference line on bender frame
Optic Angle Gauge
Pipe bending holes
Pipe to be bent
Pivot
Shoe
Pivot Bend
Line up center of bend
with arrow on side
Step B – Pipe Bending
Hydraulic oil to this hose
Direction of cylinder
plunger travel
Pipe eject holes
Pivot pin
Pivot shoe
Step C – Pipe Ejection