Parker HB632 User manual

Hydraulic Tube Bender
Model HB632
Bulletin 4391-B26

Parker Hannifin Corporation
Tube Fittings Division
Columbus, OH
www.parker.com/tfd
Bulletin 4391-B26 Hydraulic Tube Bender
FAILURE OR IMPROPER SELECTION OR IMPROPER USE OF THE PRODUCTS AND/OR SYSTEMS DESCRIBED HEREIN OR RELATED ITEMS CAN CAUSE DEATH, PERSONAL
INJURY AND PROPERTY DAMAGE.
This document and other information from Parker Hannifin Corporation, its subsidiaries and authorized distributors provide product and/or system options for further investigation by users
having technical expertise. It is important that you analyze all aspects of your application and review the information concerning the product or system in the current product catalog. Due
to the variety of operating conditions and applications for these products or systems, the user, through its own analysis and testing, is solely responsible for making the final selection of
the products and systems and assuring that all performance, safety and warning requirements of the application are met.
The products described herein, including without limitation, product features, specifications, designs, availability and pricing, are subject to change by Parker Hannifin Corporation and its
subsidiaries at any time without notice.
WARNING
 Copyright 2016, Parker Hannifin Corporation, All Rights Reserved
The items described in this document are hereby offered for sale by Parker Hannifin Corporation, its subsidiaries or its authorized distributors. This offer and its acceptance are governed
by the provisions stated in the “Offer of Sale”.
Offer of Sale
Table of Contents
Table of Contents
Introduction........................................................................... 1
Bender Parts and Accessories .............................................2
Radius Blocks.......................................................................3
Side Blocks........................................................................... 4
Clamp Blocks........................................................................4
Medium to Heavy Wall Tube Bending .............................5 – 7
Thin Wall Tube Bending with Mandrel Equipment ........8 – 10
Parts Schematic .........................................................11 – 13
Maintenance....................................................................... 14
Warranty ............................................................................14
Troubleshooting ..................................................................14
Offer of Sale .......................................................................17

1Parker Hannifin Corporation
Tube Fittings Division
Columbus, OH
www.parker.com/tfd
Bulletin 4391-B26 Hydraulic Tube Bender
Introduction
Parker Hydraulic Tube Bender
Model HB632
For 3/8" – 2" (10-50mm) tubing
and 3/8 to 1-1/2 IPS Pipe
The Parker Model HB632 Tube Bender is a
hydraulically operated bender for bending
annealed steel and stainless steel tubing
from 3/8" O.D. through 2" O.D. It is oper-
ated by means of a separate power source
producing 10,000 psi hydraulic pressure. It
can be operated without bolting to a table or
bench if no mandrels are required, making it
an excellent unit to move about and use
at the point where the tubing installation is
being made. It can also be attached to a
table and used with mandrels.
Capacity
Table 1 at right assigns a Model Code for
each model of Parker tube benders. Table 2
gives the capacity for all Parker benders. The
Model HB632 is represented by model code
C so you can easily check for its capabilities in
Table 2.
Part No.: 631050
Bender Construction
The bender consists of a cast aluminum housing, with a hydraulically
actuated drive mechanism which enables an operator to make bends up to
180° in one continuous smooth operation on tubing up to 2" in diameter.
Specifications:
1) Min. tube size 3/8"
2) Max. tube size 2"
3) Min. bend radius 1-1/8"
4) Max. bend radius 12" (special order)
5) Max. tube bend 180°
6) Weight — 170 lbs. (77.1 kg) without accessories
7) Minimum tube wall thickness (% of O.D.) 4% with
mandrel, 7% without mandrel
8) The HB632 is capable of bending 1/2" O.D. and
under fully annealed steel and stainless steel tubing
with no limit on tube wall thickness
9) The HB632 is capable of bending SOFT aluminum
and copper tubing with no limit on wall thickness.
10) For HARD copper, ALLOY STEEL, and HIGH
STRENGTH aluminum, use the tabulations shown
for stainless steel.
Tube Bender Model Codes
Model
Code
Model
No.
Tubing O.D.
Capacity
Bender
Type
Rated Torque
(in./lbs.)
A 412 1/4" – 3/4" Worm & Gear 2,700
B 424 1/4" – 1-1/4" Worm & Gear 11,000
C HB632 1/4" – 2" Hydraulic 52,000
D CP432 3/8" – 2" Hydraulic N/A
Table 1 – Tube Bender Model Codes
Tube Benders Maximum Capacity Guide*
Tube
O.D.
(in.) Material
Tube Wall Thickness (inches)
0.035 0.049 0.058 0.065 0.072 0.083 0.095 0.109 0.120 0.134 0.156 0.188
Tube Bender Model Codes
3/4 S ABCD ABCD ABCD ABCD BCD BCD BCD BCD BCD BCD BCD BCD
SS BCD BCD BCD BCD BCD BCD BCD BCD BCD BCD BCD BCD
1S BCD BCD BCD BCD BCD BCD BCD BCD BCD BCD BCD BCD
SS BCD BCD BCD BCD BCD BCD BCD BCD BCD BCD CD CD
1-1/4 S BCD BCD BCD BCD BCD BCD CD CD CD CD CD CD
SS BCD BCD BCD BCD BCD CD CD CD CD CD C C
1-1/2 S BCD BCD BCD BCD BCD CD CD CD CD CD CD CD
SS BCD BCD CD CD CD CD CD CD CD CD C C
2S CD CD CD CD CD CD CD CD CD CD CD CD
SS CD CD CD CD CD CD CD CD CD CD — —
Table 2 – Tube Benders Maximum Capacity Guide * See page 3 for pipe bending capabilities

2Parker Hannifin Corporation
Tube Fittings Division
Columbus, OH
www.parker.com/tfd
Bulletin 4391-B26 Hydraulic Tube Bender
Mandrel Rods
Part No. — See table
Mandrel rods are for use with the HB632 Model Bender
and Exactol Models 412/424 benders. Mandrel rods
(as well as mandrel rod stop assembly) are required
when using mandrels. Overall mandrel rod lengths are
approximately eight feet. Mandrel rod diameters are
determined by tube I.D. (See Table 3.)
Mandrel Rod Stop Assembly
For use with Model HB632 Bender
The mandrel rod stop assembly holds and supports
the end of the mandrel rod in alignment with the tubing.
The rod stop assembly is bolted to the other end of
bender table. It keeps the mandrel and rod in align-
ment when mandrel bending. The stop screws can
be adjusted for correct length and positioning of the
mandrel in the tubing.
Description Part No.
Mandrel Rod Stop Assembly
(for Bender Model HB632)
631141
Universal Side Angle Indicator
Part No. 520520
Accurately determines the angle between tube bends
in different planes, and keeps out-of-plane angles
accurate when making repeated bends. Incorporates
a large, easy-to-read vernier dial. Maximum 3/4" O.D.
tubing can be used if the tubing must be extended
through the indicator. Maximum 1-1/2" O.D. tubing can
be used if the end of tube is held in the clamp jaw. Part No. 520520 – Universal
Side Angle Indicator
Part No. 631141 – HB632 Mandrels, Mandrel Rods and Rod Stop
Assembly
Bender Table – 520515
Heavy, all steel construction, strongly braced to
keep bender, mandrel rod and rod stop assembly
rigidly braced. Length 10 feet; weight 421 lbs.
900085 – Pump (std.)
974691 – High
Flow Pump
Standard Radius Blocks
660221 – Radius
Block Adapter Plate
Tie Bar
Slide
Blocks
Clamp
Blocks
Bender Parts and Accessories
Close Bend Radius Blocks
Part
No.
Mandrel
Rod Dia.
(in.)
Tube
I.D.
520506 1/4 0.283 – 0.362
520507 5/16 0.363 – 0.484
520508 13/32 0.485 – 1.489
Table 3 – Mandrel Rod Sizes

3Parker Hannifin Corporation
Tube Fittings Division
Columbus, OH
www.parker.com/tfd
Bulletin 4391-B26 Hydraulic Tube Bender
When using radius blocks 631057-112, 631060-128,
974330 and 974350, first install the radius block
adapter plate over the king pin, and then mount the
radius block upon it, as shown above.
Close bend radius blocks — These blocks have a
threaded pin which threads directly into both Triple-Lok
and Ferulok (Seal-Lok requires an adapter) tube fitting
nuts, permitting a first bend very close to the end of the
tube.
Inch Radius Block Chart
Size
Tube O.D.
AND10111 Standard MS33611 Standard Radius Block – Close Bend**
Part
No.
Radius* Part
No.
Radius* Part
No.
Radius*
in. mm in. mm in. mm in. mm
6 3/8 9.5 540502 1-1/4 31.8 590512-18 1-1/8 28.6 — — —
8 1/2 12.7 530763 1-1/4 31.8 590515-24 1-1/2 37.5 530597 1-1/4 31.8
10 5/8 15.9 530764 1-1/2 37.5 590518-30 1-7/8 47.6 530601 1-1/2 38.1
12 3/4 19.0 530765 1-3/4 43.8 590521-36 2-1/4 57.2 530605 1-3/4 44.5
14 7/8 22.2 530766 2 50.2 590523-42 2-5/8 66.7 530609 2 50.8
16 1 25.4 — — — 590524-48 3 76.2 530613 3 76.2
18 1-1/8 28.6 530768 3-1/2 88.9 590526-54 3-3/8 85.7 530617 3-1/2 88.9
20 1-1/4 31.8 — — — 590527-60 3-3/4 95.3 530621 3-3/4 95.2
24 1-1/2 38.2 530770 5 127.0 590530-72 4-1/2 114.3 530625 5 127.0
28 1-3/4 44.5 — — — 631057-112 7 177.8 — — —
32 2 50.8 — — — 631060-128 8 203.2 — — —
*Radius to tube centerline. **Note: Sizes 20 and 24 close bend radius blocks requires the removal of the clamp arm before installation.
Metric Radius Block Chart
Tube
O.D.
(mm)
Standard Radius Blocks Close Bend Radius Blocks***
Part
No.
Radius
(mm)
Part
No.
Radius
(mm)
10 810023 32 — —
12 780175 32 780185 32
14 780176 38 780186 38
15 780177 38 780187 38
16 780178 38 780188 38
18 780179 44 780189 44
20 780180 44 780190 44
22 780181 89 — —
25 780182 100 — —
30 780183 128 — —
32 780184 128 — —
35 974344 105 — —
38 530770 127 530625 127
38 590530-72 114.3 — —
42 974347 128 — —
50 974350 150 — —
***Note: Size 38mm close bend radius blocks requires removal of the clamp
arm before installation.
Accessories for Close Bend
Radius Blocks
Tube O.D.
(in.)
Threaded Pin
Part No.
Seal-Lok Adapter
Part No.
1/2 930420-8 930421-8
5/8 930420-10 930421-10
3/4 930420-12 930421-12
1930420-16 930421-16
1-1/4 930420-20 930421-20
1-1/2 930420-24 930421-24
Threaded Pins and Seal-Lok Adapters for Close Bend
Radius Blocks
Inch Pipe Size Radius Block Chart
Nominal
Pipe Size
(in.)
O.D.
(in.)
Part
No.
Bend
Radius
(in.)
Max.
Pipe
Schedule
3/8 0.675 974325 2-1/4 80
1/2 0.840 974326 2-5/8 160
3/4 1.050 974327 3-1/4 80
1 1.315 974328 4 80
1-1/4 1.660 974329 5 80
1-1/2 1.900 974330 6 40
Radius Blocks

4Parker Hannifin Corporation
Tube Fittings Division
Columbus, OH
www.parker.com/tfd
Bulletin 4391-B26 Hydraulic Tube Bender
Slide Blocks Clamp Blocks
Inch Tube Sizes
Size Tube O.D. (in.)
Part
No.
6 3/8 864276
8-12-16-24 1/2, 3/4, 1, 1-1/2 520516
10-14-18-20 5/8, 7/8, 1-1/8, 1-1/4 520518
28 1-3/4 631063
32 2 631066
Slide Block
Metric Tube Sizes
Size
Tube O.D.
(in.)
Part
No.
10-12-14-16 10-12-14-16 790016
15-16-18-20 15-16-18-20 780192
22-25-30-32 22-25-30-32 780193
35 35 974345
38 38 520516
42 42 974348
50 50 974351
Slide Block
IPS Tube Sizes
Nominal Pipe Size
(in.)
O.D.
(in.)
Part
No.
3/8, 1/2, 3/4 0.675, 0.840, 1.050 974331
1 1.315 974336
1-1/4 1.660 974340
1-1/2 1.900 974342
Slide Block
Size
Tube O.D.
(in.)
Part
No.
6 3/8 864266
8-12-16-24 1/2, 3/4, 1, 1-1/2 631092
10-14-18-20 5/8, 7/8, 1-1/8, 1-1/4 631093
28 1-3/4 027418-28
32 2 027418-32
Clamp Block
Size
Tube O.D.
(mm)
Part
No.
10-12-14-16 10-12-14-16 790017
15-16-18-20 15-16-18-20 780195
22-25-30-32 22-25-30-32 780196
35 35 974346
38 38 631092
42 42 974349
50 50 974352
Clamp Block
Nominal Pipe Size
(in.)
O.D.
(in.)
Part
No.
3/8, 1/2, 3/4 0.675, 0.840, 1.050 974332
1 1.315 974338
1-1/4 1.660 974341
1-1/2 1.900 974343
Clamp Block
Slide Blocks and Clamp Blocks

5Parker Hannifin Corporation
Tube Fittings Division
Columbus, OH
www.parker.com/tfd
Bulletin 4391-B26 Hydraulic Tube Bender
The bender is shipped completely assembled except for attaching a pump, hose, and installing selected
bender dies.
Medium to Heavy Wall Tube Bending
Step 1: Mounting Tube Bender
Position bender centered across the end of
bender table and bolt securely in place. The
Parker bender table has pre-drilled holes for
bender attachment.
3 bolts, nuts and washers required for mounting bender
Step 2: Connect Pump to Bender
Connect the hose assembly (part no.
910004) to the pump (3/8" NPT end) and
then connect hose to the bender. Be careful
not to twist the hose when tightening. Use a
pipe sealant on the pipe threads. The make-
up for the NPT end is 2 to 3 turns from finger
tight. The assembly torque for the Seal-Lok
hose adapter (6G6L-S) that is connected to
the bender is 360 in. lbs.
Step 3: Select and Install Radius Block
Select the proper radius block according to
the chart on page 3. Then install the selected
radius block on the king and drive pins with
the open end of the block toward the clamp
arm.
Radius blocks are accurately milled and bored
to slip easily onto posts. Light lubrication of
the posts will aid assembly. When handling
radius blocks, as well as the slide and clamp
blocks, care should be taken to avoid nicking
the grooved surfaces.
Step 4: Mark the Tube
The first bend is easy. Simply measure from
the end of the tube to the desired length of
the centerline* of the first bend.
*For information on tube bending, centerline
measurement, and back-bending compensation,
see Parker Principles of Tube Line Fabrication,
Manual 4306-B5.

6Parker Hannifin Corporation
Tube Fittings Division
Columbus, OH
www.parker.com/tfd
Bulletin 4391-B26 Hydraulic Tube Bender
Step 5: Select Slide and Clamp Block Grooves
Select the proper groove of the slide block
and clamp block for the outside diameter
of tube (sizes are marked on end of each
block). Lubricate the slide block to facilitate
its sliding. Place the clamp block in its vise.
Do not lubricate the clamp block. It’s held in
place magnetically.
Medium to Heavy Wall Tube Bending
Step 6: Rapid Positioning
Both the clamp and slide block vise screws
feature rapid positioning, with a quick acting
cam lock mechanism. To use, pull the respec-
tive cam lock mechanism to disengage, push
the screw forward, then push the cam lock
forward to engage.
Step 7: Positioning the Tube
Advance the clamp block vise as described
above. Then position the tube in the clamp
block so that the mark is tangent to the
radius block at the desired angle (90° for 90°
bend; 45 ° for 45° bend, etc.). Use triangles
to obtain accurate results (see diagram).
The tubing should be positioned in the
bender so that the end measured from, or
“measurement end”, is to the left as you face
the bender.
For 180° bends, position the mark similar to
90° bends.
On long lengths of tubing, support is
recommended to prevent sag.
Step 8: Clamp the Tube
When in the proper position, clamp the tube
with the clamp block vise. Next, advance the
slide block vise using the rapid positioning
sequence described.
Rotate the slide block retainer to the proper
height and insert the slide block. Then bring
into snug position against the tube, but not
with so much pressure as to prevent the
block from sliding freely. The clamp block and
slide block should not be touching.

7Parker Hannifin Corporation
Tube Fittings Division
Columbus, OH
www.parker.com/tfd
Bulletin 4391-B26 Hydraulic Tube Bender
Step 9: Using the Tie Bar (when required)
If the tube is over 1" O.D. (25mm or 1/2 IPS),
or heavy wall, or if mandrel bending, the tie
bar must be used to prevent tube slippage
and the clamp arm from flexing.
Step 10: Setting Bend Angle (Shown inset at top)
Set the angle to be bent on the angle indica-
tor by turning the angle adjusting handle on
the back of the bender housing. Generally
add two to five degrees to the angle you wish
to bend to compensate for the spring-back in
the tube.
Medium to Heavy Wall Tube Bending
Step 11: Bending the Tube
To bend the tube, start the pump and close
the valve.
CAUTION — Should it become apparent that
the bend is too long for the slide block, stop
the bender and loosen the slide block vise.
Return the slide block to its original position.
Retighten the vise screw and complete the
bend.
When the preset angle has been reached,
shut off the pump.
Step 12: Completed Bent Tube
Remove the tie bar, if in use, retract the slide
and clamp vises, and pull the tube out from
the radius block and lift up. Your tubing is
bent, without flattening or cracking.
Releasing system pressure by opening the
valve will relieve tension in the bender and the
clamp arm will return to its original position.

8Parker Hannifin Corporation
Tube Fittings Division
Columbus, OH
www.parker.com/tfd
Bulletin 4391-B26 Hydraulic Tube Bender
When to Mandrel Bend
For short radii bends and thin-wall tubing, mandrel
equipment is necessary to prevent wrinkling, collaps-
ing, or kinking of the tube. The mandrel supports the
tube wall on the inside and maintains a full cross-
section in a smooth bend. This is important and
should be included as an indispensable part of
bending equipment.
The rule that is generally followed to determine whether
or not a mandrel is necessary is as follows: When the
wall thickness of the tube to be bent is 7% or more of
the tube O.D., a mandrel is usually not necessary. On
wall thicknesses that ranges between 4-6% of the tube
O.D., it is necessary to use a mandrel to avoid wrinkling
and flattening in the bend area. These calculations are
based on a bend radii of between three and four times
the tube O.D.
Since mandrel equipment must be accurately aligned
and rigidly held, we recommend the use of the bender
table.
Mandrel Rod Specifications and Data
Mandrel
Rod Size
Mandrel Rod
Dia.
Tube I.D. inches (mm)
Part
No. Typein. mm
1/4 1/4 6.4 .283 (7.2) to .362 (9.2) 520506 Solid
5/16 5/16 7.9 .363 (9.2) to .484 (12.3) 520507 Solid
13/32 13/32 10.3 .485 (12.3) to 1.489 (37.8) 520508 Solid
Mandrel Specifications and Data
Size
Tube O.D. Part
No. Type
Wall Thickness
in. mm in. in. in. in. in.
6 3/8 9.5 924417 Solid — .035 .042 — —
8 1/2 12.7 924417 Solid — .035 .042 .049 —
10 5/8 15.9 924417 Solid .035 .042 .049 .058 .065
12 3/4 19.0 924417 Solid .035 .042 .049 .058 .065
14 7/8 22.2 924417 Solid .035 .042 .049 .058 .065
16 1 25.4 924417 Solid .035 .042 .049 .058 .065
18 1-1/8 28.6 924417 Solid — .049 .058 .065 —
20 1-1/4 31.8 924417 Solid — .049 .058 .065 —
24 1-1/2 38.1 924417 Solid .049 .058 .065 .083 —
To order mandrels, specify part number, size and wall thickness.
Example: 924417-12X058
Thin Wall Tube Bending with Mandrel Equipment
Description Part No.
Mandrel Rod Stop Assembly 631141
Mandrel Rod Stop Adapter (1/4" Rod) 522398
Mandrel Rod Stop Adapter (5/16" Rod) 550501
Mandrel Rod Stop Assembly
This assembly holds the end of the mandrel rod in
proper alignment with the tubing and bender. It bolts
to the back end of the table. A scale permits accurate
alignment of the stop screws. (Although not an extrac-
tor, this assembly is necessary to secure the mandrel
and rod during the bending process.)
The Parker bender table has pre-drilled holes for the
bender and rod stop assembly attachment. These
pre-drilled holes insure proper bender and rod stop
assembly alignment.

9Parker Hannifin Corporation
Tube Fittings Division
Columbus, OH
www.parker.com/tfd
Bulletin 4391-B26 Hydraulic Tube Bender
Step 2: Select Radius Block, Mandrel
and Rod
Select the proper radius block
according to the chart on page
3. Select the mandrel and man-
drel rod according to the outside
diameter and wall thickness of
the tubing.
Step 1: Mandrel Rod Stop Assembly Installation
The mandrel rod stop assembly must be rigidly mounted
to the bender table in proper alignment with the bender.
Zero (“0”) at the end of the mandrel rod stop assembly
scale must be in line with the center of the king pin.
Step 3A: Install and Adjust Mandrel
The selected mandrel is screwed onto one
end of the mandrel rod. The other end of the
mandrel rod is screwed into the adapter and
then into the universal joint tongue on the rod
stop assembly. The scale provided permits
accurate alignment of the stop screw. The
stop screw should be centered to the dimen-
sion on the scale corresponding to the bend
radius.
Step 3B: Install and Adjust Mandrel (Continued)
For average bending the mandrel should
be adjusted so that the scribed line on its
circumference is 5/8" behind the line
scribed on the face of the radius block. This
adjustment is made by turning the mandrel
rod stop handles at the rear of the bench.
The mandrel may be moved inward slightly to
produce a more perfectly round cross-section
or it may be moved slightly outward to ease
the bending effort. Extreme care must be
used in establishing this position as even the
slightest adjustment will affect the results.
Step 4: Insert the Tube
First lubricate the mandrel with light lubricat-
ing oil. Then, slip the tube over the mandrel.
Thin Wall Tube Bending with Mandrel Equipment

10 Parker Hannifin Corporation
Tube Fittings Division
Columbus, OH
www.parker.com/tfd
Bulletin 4391-B26 Hydraulic Tube Bender
Steps 5 through 12 below are a repeat of steps 4 through 11 on pages 5-7.
Step 13: Completed Bent Tube
After completion of the bend, remove the tie bar, retract
the slide and clamp block vises, and by pulling the
tubing to the left, slide it off of the mandrel rod assem-
bly. Then release the system pressure by opening the
valve. The clamp arm will return to the starting position.
Step 5: Mark the Tube Step 6: Select Slide and Clamp
Block Grooves
Step 8: Positioning the Tube Step 9: Clamp the Tube
Step 7: Rapid Positioning
Step 10: Using the Tie Bar
Step 11: Setting the Bend Angle
Step 12: Bending the Tube
Thin Wall Tube Bending with Mandrel Equipment

11 Parker Hannifin Corporation
Tube Fittings Division
Columbus, OH
www.parker.com/tfd
Bulletin 4391-B26 Hydraulic Tube Bender
Slide Arm
Assembly
Clamp Arm
Assembly
Parts Schematic
Item No. Description Part No. Qty.
1 Main Housing with Internal Components* — 1
2 King Pin* — 1
3 Center Post 6-1638-10 1
4Hand Wheel 660220 1
5 Screw Bushing* — 1
6 1/4-20 x 3/8" Socket Head Cap Screw 13302 1
7 Angle Indicator Plate 631138 1
8 #10-24 Round Head Screw 10-24X3/8 8
9 Warning Plate 631139 1
10 Nameplate 550609 1
11 #0-1/8 Drive Screw 13050 8
12 Oil Hole Cover, 5/16" diameter 502-G 2
13 Radial Pointer 631136 1
14 #6-32 x 1/4" Round Head Screw 13179 2
15 1/8" NPTF Grease Fitting 13359 2
*Contact the Tube Fittings Division for repair. Phone: [phone].

12 Parker Hannifin Corporation
Tube Fittings Division
Columbus, OH
www.parker.com/tfd
Bulletin 4391-B26 Hydraulic Tube Bender
Slide Arm Assembly
Parts Schematic
(Table continued on the following page)
Item No. Description Part No. Qty.
16 Slide Rail 660219 1
17 3/8-16 x 3/4" Socket Head Cap Screw 13321 4
18 3/8-16 X 1 Socket Head Screw 13305 4
19 Dowel Pin, 3/8" dia. x 1-1/2" long 13320 2
20 1/4-20 x 5/8" Flat Head Screw 13367 2
21 Wear Plate 900135 1
22 Vise Face, Slide Rail 631100 1
23 Slide Block Retainer 631101 1
24 1/2-13 x 1" Socket Head Cap Screw 13327 1
25 Roll Pin, 1/4" dia. x 1-7/8" long 13328 2
26 1/4" dia. x 1" long Drive Lok "C" pin 970096 2
27 1/4" dia. x 1-1/4" long Drive Lok "C" pin 13509 1
28 Pivot Half Nut 970088 2
29 Slide Arm Bracket 970086 1
30 Cam Latch 970089 2
31 Red Grip 970090 2
32 0.261" I.D. x 0.432" O.D. Wave Washer 970093 1
33 Dowel Pin, 1/4" dia. x 3/4" long 970091 1
34 Vise Adjusting Screw 631103 1
35 Vise Adjusting Screw Handle 522196 1
36 Roll Pin, 5/32" dia. x 7/8" long 5/32 X 7/8 ROLL PIN 1

13 Parker Hannifin Corporation
Tube Fittings Division
Columbus, OH
www.parker.com/tfd
Bulletin 4391-B26 Hydraulic Tube Bender
Clamp Arm Assembly
Parts Schematic
Item No. Description Part No. Qty.
37 Clamp Rail Arm 660224 1
38 Drive Post 660238 1
39 Tie Bar 660438 1
40 Spacer Plate 660228 1
41 #8-32 x 5/8" Flat Head Screw 13346 2
42 1/4-20 x 3/8" Socket Head Set Screw, Nylon 13302 1
43 Clamp Arm Bracket 13387 1
44 Dowel Pin, 5/8" dia. x 1-1/2" long 13102 1
45 Cup Magnet, 1-1/4" dia. x 1", 15lb. 660227 1
46 Vise Face, Clamp Arm 660226 1
47 1/4" x 1-1/4" Socket Head Shoulder Screw 970092 2
34, 35, 36 Vise Adjusting Screw Sub-Assembly 13750 2
18, 19,
25-28, 30-47 Clamp Arm Bracket 13387 1
18, 19,
26-28,
30-33, 43,
44, 47
Clamp Arm Bracket Sub-Assembly 660223 1
18, 19,
26-33, 47 Slide Arm Bracket Sub-Assembly 13388 1
*Contact the Tube Fittings Division for repair. Phone: [phone].

14 Parker Hannifin Corporation
Tube Fittings Division
Columbus, OH
www.parker.com/tfd
Bulletin 4391-B26 Hydraulic Tube Bender
Bender Maintenance
The bender is equipped with two grease fittings on the
side to lubricate the king pin bearings. This should be
done at least once a year.
There are two oil hole covers on the top of the unit.
These should be serviced once a year by running oil
into them while the bender is rotating to lubricate the
roller chain.
The threads of the vise screws should receive a few
drops of oil occasionally to make certain they stay in
working condition.
Visually check all hydraulic connections regularly for
leakage.
Warranty
The bender and accessories are warranted to be free
of defects in workmanship for a period of one year from
date of sale. The bender has a sticker placed over the
king pin. Removal of the sticker voids the bender war-
ranty. Alterations to the bender or accessories voids the
warranty of the part.
Repair
The bender can be repaired. External parts are avail-
able for sale (see Parts List). For repair of internal
parts, the bender must be returned to Parker Hannifin
Tube Fittings Division. Please contact the Division (614-
279-7070) before sending the bender back for repair.
Maintenance, Warranty, and Troubleshooting
Troubleshooting
Problem Probably Cause Solution
Bender will not rotate No hydraulic power supply Verify the hydraulic pump is connected, the connections are not
leaking, and the valve is closed
Angle indicator is set at 0° Set the angle indicator to the desired bend angle
Tube slips in clamp
block
Clamp block not tightened Tighten clamp block
Incorrect radius or clamp block Check that the radius and clamp blocks match tube size
Tube is flattened or
mis-shaped
Tube requires mandrel for
bending
Check chart for mandrel bending
Incorrect slot on slide block is
used
Verify that the slot on the slide block used matches the tube size
Bender will not
complete the bend
Tube wall thickness is too large Check the capacity chart to verify the bender is rated for the wall
thicknes of the tube to be bent
Slide block is overtightened Lightly clamp the slide block – do not overtighten
Pump is low on fluid Check fluid level in the hydraulic pump