Bosch Rexroth CDT1 User manual

1/8
Service Manual for
Hydraulic Cylinder
RA 17 038-DT1SM/06.09
Replaces: 10.07
Model CDT1/CGT1
Electric Drives
and Controls Hydraulics
Linear Motion and
Assembly Technologies Pneumatics Service
Table of contents
Seal Replacement
General 2
Old Rod Cartridge Kit Removal 2
New Rod Cartridge Kit Installation 2
Piston Seal Installation 2
Exploded View Drawing 3
Weights and Torque Values 3
End Cap Seal Installation 4
Testing 5
Spare Parts 6-8
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2/8 Bosch Rexroth Corp. Industrial Hydraulics RA 17 038-DT1SM/06.09Service Manual for CDT1-CGT1
Seal Replacement
General:
1. Always drain the pressure from a hydraulic system before per-
forming any service work. Disconnect hydraulic lines from head
and cap ports of cylinder.
2. Completely disassemble the cylinder using the exploded and
assembly views as reference. No special tools are required ex-
cept internal snap ring pliers. The piston rod assembly consisting
of piston, piston rod and head cushion bushing (where used) are
locktited and secured at the factory and are not to be disas-
sembled.
3. After disassembling the cylinder, wash all metal parts in a
non-flammable solvent. Rinse each part thoroughly and blow dry
with a low-pressure air jet. Arrange the parts on a clean surface.
Examine each part carefully. Replace all seals and any other
worn or damaged parts.
4. Particular attention should be given to the piston rod (item 10)
since cylinder leakage can result from a damaged rod. A scored
rod might damage the rod bearing and, subsequently, the rod
packing. Rod cartridge kits come with a new rod bearing plus
seals (see Seal Kit table on page 6 of this manual.)
Old Rod Cartridge Kit Removal
1. Remove the hex head bolts (item 15) from the head end
(item 1).
2. Remove the retainer plate or flange (item 5) from the head end.
Locate the screwdriver slot along the top of the rod bearing (item
16). Using a flathead screwdriver, carefully pry the rod cartridge
loose from the head in a fashion similar to opening a can of paint.
The rod bearing assembly includes the wiper (item 19a), the rod
seal (item 19b), the bearing o-ring and backup ring (items 19c-d),
and the rod bearing (item 16) itself.
New Rod Cartridge Kit Installation:
1. Lubricating the new rod bearing will ease installation into the
head end. A rubber mallet may be required to push the rod bear-
ing into the head end. Caution must be taken to not cut the new
seals when passing the bearing over a male threaded rod.
2. Once the rod bearing is completely seated in the head end, the
flange or retainer plate and tie rod nuts / hex head cap screws
can be replaced onto the head end. Torque the bolts / screws to
the specifications on page 3.
Piston Seal Installation:
1. Insert the energized piston seal o-ring onto the piston in the
center groove. Do not roll the o-ring; rather, slide it into place.
Slide piston seal into the center groove, directly over top of the o-
ring. Heating the piston seal in 175°F to 212°F warm oil or water
would assist in installation by hand. While still warm, the piston
seal can be reshaped by means of a ring compressor or other aid.
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RA 17 038-DT1SM/06.09 Service Manual for CDT1-CGT1 Bosch Rexroth Corp.
Industrial Hydraulics 3/8
3
14
19h 19g 19h
12
11
13
4
17
19e 19f
7
8
19g
19h
19h3
10
9
2
19f 19e
1
17
11
12
5
16
18
15
10
6
19b
19a
16
19d 19c
1. Head
2. Tube
3. Piston
4. Cap
5. Flange
6. Cushion bushing
7. Cushion insert
8. Cushion insert retainer ring
9. Tie rod
10. Piston rod
11. Bleed screw
12. Securing plate
13. Tie rod nut
14. Set screw
15. Hex head bolt
16. Rod bearing
17. Cushion valve
18. Threaded stud
19. Seals
a. Wiper
b. Rod seal
c. Bearing o-ring
d. Bearing backup ring
e. Tube o-ring
f. Tube backup ring
g. Piston seal
h. Wear bands
Approx. Uncrated CDT1
Hyd. Cyl. Weights (lbs).
Add Per
Bore Size Zero Inch of
(inches) Stroke Stroke
1.00 3 0.2
1.50 5 0.3
2.00 7 0.4
2.50 12 0.6
3.25 20 0.8
4.00 30 0.9
5.00 45 1.0
6.00 70 1.5
8.00 100 2.0
Tie Rod Nuts and Bolts
Torque
Bore Size Tie Rod Lubricated
(inches) Threads (pound-ft)
1.000 10 - 24 2
1.500 1/4 - 28 4.5
2.000 5/16 - 24 9
2.500 5/16 - 24 12
3.250 3/8 - 24 22
4.000 3/8 - 24 22
5.000 1/2 - 20 45
6.000 1/2 - 20 45
8.000 5/8 - 18 90
Socket Head Cap Screw
(all 8" bore sizes)
Torque
Rod SHCS Lubricated
Size Size (pound-ft)
All 1/2 - 13 74
CDT1 Weight/Torque Values
Exploded View Drawing
*Note: Weights are based upon a standard rod diameter. With multiple rod
sizes and mounting options available, these weights may vary.
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4/8 Bosch Rexroth Corp. Industrial Hydraulics RA 17 038-DT1SM/06.09Service Manual for CDT1-CGT1
2. Install the split wear bands (item 19h) onto the piston in the
outer grooves.
End Cap Seal Installation:
1. Install the backup ring (item 19f) by pulling it over the face lip
(head and cap ends). Be sure the groove of the backup ring is
facing forward (barrel side). Do not drag the o-ring (item 19e)
over the face, this will twist the o-ring; rather, pull the o-ring
over the face lip, making sure it is against the groove of the
backup ring.
2. Lubricate the chamfer ends and ID of the tube. Line up the
cap end to be perpendicular with the tube. A twisting movement
might be necessary to seat the cap end against the tube. Cau-
tion must be taken not to cut the o-ring.
3. Lubricate the piston seal and guide rings. Install the piston
and rod assembly into the tube by applying force to the end of
the piston rod. With the aid of a ring compressor, this will allow
the rod assembly to seat itself into the cylinder tube.
4. After the piston and rod assembly is completely bottomed
against the cap end, lubricate the top of the piston rod wrench
flats. This will assist in installing the head end. Make sure the
cylinder head and piston rod are perpendicular to one another.
Place your hands on top of the head and push downwards in a
twisting motion. A small rubber mallet may be needed to assist
during installation. Caution must be taken not to tear any seals.
Seat the head end into the tube using the same process as seat-
ing the cap end.
CAUTION: KEEP FINGERS CLEAR BETWEEN HEAD AND TUBE
DURING INSTALLATION.
5. Install the tie rods and tighten the tie rod nuts in an X pattern
to avoid uneven loading. All threads must be torqued to the
required specification in order to ensure functional reliability of
the cylinder. For exact torque measurements, see the table on
page 3.
Seal Replacement - continued
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RA 17 038-DT1SM/06.09 Service Manual for CDT1-CGT1 Bosch Rexroth Corp.
Industrial Hydraulics 5/8
After the cylinder has been completely reassembled, it should
be tested, either on a test bench or in the regular installation.
The cylinder should be tested for cushioning, travel and leakage.
CAUTION: BE SURE AIR BLEED SCREW ON BOTH ENDS (ITEM
11) ARE COMPLETELY CLOSED.
Cushioning:
1. Turn both cushioning valves completely in and then turn
counterclockwise one (1) full turn.
2. Cycle cylinder a few times by alternating supply pressure to
head and cap ports.
3. Apply supply pressure to the head port. Rod should retract,
decelerate and may stop before completion of the stroke.
4. Apply supply pressure to the cap port. Rod should extend,
decelerate and may stop before completion of the stroke.
Testing
Travel and Leakage
1. Apply supply pressure to the head port. Rod should retract
smoothly without binding. Cylinder should retract, have less cush-
ioning and make full stroke. Check leakage at the cap end,
no leakage permitted. Check leakage around the rod bearing.
No leakage permitted.
2. Apply supply pressure to the cap port. Rod should extend
smoothly without binding. Cylinder should extend, have less cush-
ioning and make full stroke. Check leakage at head end,
no leakage permitted.
3. Return piston rod to retract position by applying supply pres-
sure to head port. Remove supply pressure and install cylinder into
service if satisfactory.
Cushion Adjustment
Turn the cushioning valve clockwise to increase the amount of
cushioning and counterclockwise to decrease cushioning. To ob-
tain the most effective cushioning, final adjustment must be made
while the cylinder is operating under normal conditions at normal
operating pressure.
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6/8 Bosch Rexroth Corp. Industrial Hydraulics RA 17 038-DT1SM/06.09Service Manual for CDT1-CGT1
Spare Parts
Bore Ø (inches) M T * F * V *
1.000 R978006829 R978006849 R978006859 R978006839
1.500 R978006830 R978006850 R978006860 R978006840
2.000 R978006831 R978006851 R978006861 R978006841
2.500 R978006832 R978006852 R978006862 R978006842
3.250 R978006833 R978006853 R978006863 R978006843
4.000 R978006834 R978006854 R978006864 R978006844
5.000 R978006835 R978006855 R978006865 R978006845
6.000 R978006836 R978006856 R978006866 R978006846
8.000 R978006838 R978006858 R978006868 R978006848
Rod Ø (inches) M T * F * V *
0.50 R978009780 R978009782 R978009783 R978009781
0.625 R978006773 R978006801 R978006815 R978006787
1.000 (1.500" bore) R978006774 R978006802 R978006816 R978006788
1.000 (2.000"-2.500" bore) R978006775 R978006803 R978006817 R978006789
1.375 (2.000" bore) R978006776 R978006804 R978006818 R978006790
1.375 (2.500"-3.250" bore) R978006777 R978006805 R978006819 R978006791
1.750 R978006778 R978006806 R978006820 R978006792
2.000 R978006779 R978006807 R978006821 R978006793
2.500 R978006780 R978006808 R978006822 R978006794
3.000 R978006781 R978006809 R978006823 R978006795
3.500 R978006782 R978006810 R978006824 R978006796
4.000 R978006783 R978006811 R978006825 R978006797
4.500 R978006784 R978006812 R978006826 R978006798
5.000 R978006785 R978006813 R978006827 R978006799
5.500 R978006786 R978006814 R978006828 R978006800
Piston and Tube Seal Kits (Items 19e, f, g, h) ~
(Z10 Series prior to November 1, 2006)
Rod Cartridge Seal Kits w/Rod Bearing (Items 19a, b, c, d and Item 16) †§
(Z10 Series prior to November 1, 2006)
M= Polyurethane seal system (standard)
T= Seal system for low frction applicatios (available)
F= Standard seal system for HFC (water glycol) (available)
V= Seal system for (phosphate ester) (available)
Note:
*= not recommended for load holding applications
§= CGT1 (double-rod) version requires two Rod Cartridge Kits
~Piston/Tube Seal Kits include: one (1) double-acting piston
seal; two (2) wear bands; two (2) o-rings and two (2) back-up
rings
†Rod Cartridge Seal Kits include: one (1) double-lip wiper
set; one (1) u-cup rod seal; one (1) rod bearing; one (1) back-
up ring, one (1) o-ring
Bore Size** M, T, F V
1-1/2", 2", 2-1/2" R433015236 R978006424
3-1/4", 4", 5" R433016568 R978006436
6", 8" R433023258 R978006437
Cushion Valve (Item 17)
** adjustable cushions are not available on
1" bore size cylinders.
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RA 17 038-DT1SM/06.09 Service Manual for CDT1-CGT1 Bosch Rexroth Corp.
Industrial Hydraulics 7/8
Spare Parts
Bore Ø (inches) M T * F * V *
1.000 R978029042 R978029064 R978029064 R978029053
1.500 R978029043 R978029065 R978029065 R978029054
2.000 R978029044 R978029066 R978029066 R978029055
2.500 R978029045 R978029067 R978029067 R978029056
3.250 R978029046 R978029068 R978029068 R978029057
4.000 R978029047 R978029069 R978029069 R978029058
5.000 R978029048 R978029070 R978029070 R978029059
6.000 R978029049 R978029071 R978029071 R978029060
7.000 R978029051 R978029072 R978029072 R978029062
8.000 R978029052 R978029073 R978029073 R978029063
Rod Ø (inches) M T * F * V *
0.50 R978009780 R978009782 R978009783 R978009781
0.625 R978006773 R978032046 R978032046 R978032045
1.000 (1.500" bore) R978006774 R978021088 R978021088 R978021097
1.000 (2.000"-2.500" bore) R978006775 R978029158 R978029158 R978029154
1.375 (2.000" bore) R978006776 R978021089 R978021089 R978021098
1.375 (2.500"-3.250" bore) R978006777 R978021090 R978021090 R978021099
1.750 R978006778 R978021091 R978021091 R978021100
2.000 R978006779 R978021092 R978021092 R978021101
2.500 R978006780 R978021093 R978021093 R978021102
3.000 R978006781 R978021094 R978021094 R978021103
3.500 R978006782 R978021095 R978021095 R978021104
4.000 R978006783 R978021096 R978021096 R978021105
4.500 R978006784 R978029159 R978029159 R978029155
5.000 R978006785 R978029160 R978029160 R978029156
5.500 R978006786 R978029161 R978029161 R978029157
Piston and Tube Seal Kits (Items 19e, f, g, h) ~
(Z11 Series after to November 1, 2006)
Rod Cartridge Seal Kits w/Rod Bearing (Items 19a, b, c, d and Item 16) †§
(Z11 Series after to November 1, 2006)
Cushion Valve (Item 17)
** adjustable cushions are not available on
1" bore size cylinders.
M= Polyurethane seal system (standard)
T= Seal system for low frction applicatios (available)
F= Standard seal system for HFC (water glycol) (available)
V= Seal system for (phosphate ester) (available)
Note:
*= not recommended for load holding applications
§= CGT4 (double-rod) version requires two Rod Cartridge Kits
~Piston/Tube Seal Kits include: one (1) double-acting piston
seal;
two (2) wear bands; two (2) o-rings and two (2) back-up rings
†"M"Rod Cartridge Seal Kits include: one (1) double-lip wiper
set; one (1) u-cup rod seal; one (1) rod bearing; one (1) back-up
ring, one (1) o-ring
"T, F, V" rod cartridge seal kit includes: one (1) excluder wiper,
two (2) step seal rod seals, one (1) rod bearing, one (1) back-up
ring, one (1) o-ring
Bore Size** M, T, F V
1-1/2", 2", 2-1/2" R433015236 R978006424
3-1/4", 4", 5" R433016568 R978006436
6", 8" R433023258 R978006437
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8/8 Bosch Rexroth Corp. Industrial Hydraulics RA 17 038-DT1SM/06.09Service Manual for CDT1-CGT1
Bosch Rexroth Corp.
Industrial Hydraulics
2315 City Line Road
Bethlehem, PA 18017-2131
USA
Telephone [phone]
Facsimile [phone]
www.boschrexroth-us.com
© 2004 Bosch Rexroth Corporation
All rights reserved. Neither this document nor any part of it may be reproduced,
duplicated circulated or disseminated, whether by copy, electronic format or
any other means, without the prior consent and authorization of Bosch Rexroth
Corporation.
The data and illustrations in this brochure/data sheet are intended only to
describe or depict the products. No representation or warranty, either express
or implied, relating to merchantability or fitness for intended use, is given or
intended by virtue of the information contained in this brochure/data sheet. The
information contained in this brochure/data sheet in no way relieves the user of it
obligation to insure the proper use of the products for a specific use or applica-
tion. All products contained in this brochure/data sheet are subject to normal
wear and tear from usage.
Subject to change.
Spare Parts
Bore Size Part No.
1.000 R978007816
1.500 R978007817
2.000 R978007818
2.500 R978007819
3.250 R978007820
4.000 R978007821
5.000 R978007822
6.000 R978007823
8.000 R978007824
Tube (Item 2)*
MX0, MS2, MT1
Bore Size MT2, MP1 MF1, MF5 MF2, MF6 MX1 MX2 MX3
1.000 R978008229 R978010028 R978010035 R978010042 R978010050 R978010058
1.500 R978008230 R978010029 R978010036 R978010043 R978010051 R978010059
2.000 R978008231 R978010030 R978010037 R978010044 R978010052 R978010060
2.500 R978008232 R978010031 R978010038 R978010045 R978010053 R978010061
3.250 R978008233 R978010032 R978010039 R978010046 R978010054 R978010062
4.000 as above as above as above as above as above as above
5.000 R978008234 R978010033 R978010457 R978010047 R978010055 R978010063
6.000 R978008235 R978010034 R978010041 R978010048 R978010056 R978010064
8.000 R978008236 n/a n/a R978010049 R978010057 R978010065
Tie Rods (Item9)*
*specify complete cylinder part number and stroke length when ordering.
Piston and Rod Assemblies (Items 3, 6, 10, 14, 19e, f, g, h)*
Consult Factory for Part Numbers and Pricing.
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