Kobelt 7065-SB Series User manual

Kobelt Manufacturing Co. Ltd
7065-SBXX Power Assist Cylinder
Owner's Manual
April 2021

7065-SBXX Power Assist Cylinder Kobelt Manufacturing Co. Ltd
Rev A MNL-7065-SBXX 1 of 18
NOTES:
RECORD DATA BEFORE INSTALLATION FOR FUTURE REFERENCE
Model #:
Serial #:
Date of purchase:
Date of installation:
Motor brand and part #:

7065-SBXX Power Assist Cylinder Kobelt Manufacturing Co. Ltd
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TABLE OF CONTENTS
1Introduction............................................................................................................ 3
1.1 Contact .....................................................................................................................3
1.2 Safety........................................................................................................................3
2Product Description................................................................................................. 5
2.1 Technical Data ..........................................................................................................6
3Installation.............................................................................................................. 7
3.1 Mechanical ...............................................................................................................7
3.2 Hydraulic...................................................................................................................9
4Commissioning...................................................................................................... 10
4.1 Flushing ..................................................................................................................10
4.2 Inspection and Function Test..................................................................................10
5Maintenance and Service....................................................................................... 11
5.1 Preventative Maintenance .....................................................................................11
5.2 Recommended Spare Parts.....................................................................................11
6Parts Lists.............................................................................................................. 12
6.1 Top-Level Assembly ................................................................................................12
6.2 Control Cylinder Parts List ......................................................................................15
6.3 Valve Assembly Parts List........................................................................................16
7Warranty............................................................................................................... 17

7065-SBXX Power Assist Cylinder Kobelt Manufacturing Co. Ltd
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1INTRODUCTION
1.1 CONTACT
Kobelt Manufacturing Co. Ltd.
8238 129th Street
Surrey, British Columbia
Canada, V3W 0A6
Sales Tel:
Fax:
Email:
Website:
[phone]
[phone]
[e-mail]
www.kobelt.com
This document is intended to clearly present comprehensive product data and provide
technical information to assist the end user in design applications. Kobelt reserves the right,
without notice, to change the design, or construction, of any products and to discontinue or
limit distribution of any products. Kobelt also reserves the right to change, or update, without
notice, any technical information contained within this document.
Kobelt recommends that customers visit our website to check for updates to this manual.
Once a product has been selected for use, it should be tested by the user to ensure proper
function in all possible applications. For further instructions, please contact our distributors or
visit our website.
1.2 SAFETY
1.2.1 Safety Alerts
Throughout this manual, the following symbols, and their accompanying explanation, are
used to alert the user to special instructions concerning a service or operation that may be
hazardous if performed incorrectly or carelessly. The associated risk levels are stated below.
This symbol indicates an imminently hazardous situation which,
if not avoided, will result in death or serious injury.
This symbol indicates a potentially hazardous situation which, if
not avoided, could result in death or serious injury.
This symbol indicates a hazardous situation, which if not
avoided, could result in minor or moderate injury.
This symbol informs the reader of events not related to
personal injury but which there is a risk of damage to property
or equipment.
This symbol informs the reader of safety-related instructions or
procedures.

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1.2.2 Notice to Installer
Disregarding the following safety measures can result in an accident-causing severe injury to
personnel and damage to material assets.
•Only use the product as directed in this manual.
•Never put the product into service if there is evidence of visible damage.
•Never put the product into service before fully completing installation and
commissioning.
•Do not carry out any modifications to the product.
•Only use authentic Kobelt spare parts.
•Observe all local regulations, directives and laws during the installation of this product.
•All installation, commissioning, and maintenance work must only be conducted by
qualified personnel. (For the purpose of this manual, qualified personnel are persons
who are familiar with the assembly, installation, commissioning, and operation of the
product and who have the qualifications necessary for their occupation.)
•Observe all specifications in this manual. If these guidelines are not followed and
damage occurs, the warranty will be voided.
1.2.3 Product Hazards
The moving components of the cylinder can generate forces
that can cause pinch or crush injuries. Keep body parts clear of
the unit when it is operating. Lock out any power sources
before working on the unit.
Exercise safety precautions pertaining to hydraulics including:
•Wearing safety glasses.
•Exhausting pressure and locking out the pressure
source.
•Being qualified to work on hydraulics.
•Never look for a leak by running your hand/fingers
along a pressurized hydraulic line.
To ensure the product does not get damaged during storage,
transportation and installation:
•Store the unit with the cylinder fully retracted.
•Ensure all plugs remain in place until the unit is ready
to be connected to hydraulics.

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2PRODUCT DESCRIPTION
The 7065-SBXX cylinders are power-assist cylinders that are controlled via inputs from fluid
pressurized by a helm pump but are powered by a machine-driven pump. This configuration
enables responsive steering while requiring minimal human effort. In the case of a failure of
the machine-driven pump the unit automatically switches to manual mode which allows for
steering via helm pump pressure only. 7065-SB cylinders consist of three main subunits which
are the main cylinder, the control cylinder, and the valve and are identified in Figure 1 below.
Figure 1 - 7065-SBXX overview diagram
This product comes in cylinder stroke configurations of 7.5, 10, 12, and 16 inches. Technical
specifications of the cylinder models can be found in Table 1 on page 6. Expected torque
values for 35° and 45° tillers can be found in Table 2.
Before ordering any steering system, it is required that a
steering gear torque and rudder calculation be done to ensure
the system is appropriately sized and the correct mix of
pressure, displacement, stroke, parts, and torque is selected.
Contact you local Kobelt partner to review this information.

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2.1 TECHNICAL DATA
Table 1 - Cylinder technical specifications
Model #
7065-SB7.5
7065-SB10
7065-SB12
7065-SB16
Stroke
± .02” [.05 cm]
7.50”
19.05 cm
10.00”
25.40 cm
12.00”
30.48 cm
16.00”
40.64 cm
Design pressure
1,500 psi
100 bar
Working pressure
1,200 psi
83 bar
Force at working
pressure
4,810 lbf
21.4 kN
Recommended
fluid
ISO VG 32, VI 60 hydraulic oil
ISO 4406 cleanliness of 20/18/15
Displacement,
main cylinder
30.9 in3
507 cc
41.2 in3
676 cc
49.5 in3
811 cc
66.0 in3
1,081 cc
Displacement,
control cylinder
4.4 in3
72 cc
5.9 in3
97 cc
7.1 in3
116 cc
9.4 in3
154 cc
Ambient
temperature
14 to 122 °F
-10 to 50 °C
Operating outside of ambient temperature range and above
maximum pressure can result in damage to the unit and
reduced operational life and will void the warranty.
Table 2 - Cylinder torque output*
Model #
7065-SB7.5
7065-SB10
7065-SB12
7065-SB16
Torque, 35° tiller
at max angle
2147 lbf·ft
297 kg·m
2863 lbf·ft
396 kg·m
3435 lbf·ft
475 kg·m
4580 lbf·ft
633 kg·m
Torque, 45° tiller
at max angle
-
2004 lbf·ft
277 kg·m
2405 lbf·ft
333 kg·m
3207 lbf·ft
443 kg·m
*7065-SB7.5 cannot be used with 45° tillers.

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3INSTALLATION
Figure 2 - 7065-SBXX rotation extents and hydraulic connections
3.1 MECHANICAL
The mounting of the cylinder should precede the connection of the unit to hydraulics if
possible. Figure 2 above indicates the rotation limits of the cylinder that should not be
exceeded. Also note that the rotation limits must be adhered to through the entire range of
motion of the cylinder, not just in the midships position. Dimensions of the cylinder when
installed to a tiller arm can be found on Figure 3 on page 8 and the tables that follow it.
If the cylinder has already been connected to a hydraulic power
source, ensure that pressure has been exhausted and the
pressure source has been locked out.
The cylinder foot must be mounted with fitted bolts or welded
stops must be installed to both ends of the foot. See Figure 3.
Ensure that the unit is mounted to a foundation that is capable
of support the loads that it can generate. If this is not taken into
consideration, then damage to the mounting structure can
occur.

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Figure 3 - 7065-SBXX installed dimensions
Table 3 - 7065-SBXX dimensions for 35° (ϑ) rudders
Model
Stroke (S)
R
X
E
F
7065-SB7.5
7.5"
191 mm
6.54"
166.1 mm
5.36"
136 mm
20.28"
515.1 mm
26.06"
662 mm
7065-SB10
10"
254 mm
8.72"
221.4 mm
7.14"
182 mm
22.78"
578.6 mm
31.06"
789 mm
7065-SB12
12"
304.8 mm
10.46"
265.7 mm
8.57"
217.7 mm
24.78"
629.4 mm
35.06"
890.6 mm
7065-SB16
16"
406.4 mm
13.95"
354.3 mm
11.43"
290.2 mm
28.78"
731 mm
43.06"
1094 mm
Table 4 - 7065-SBXX dimensions for 45° angle (ϑ) rudders*
Model
Stroke (S)
R
X
E
F
7065-SB10
10"
254 mm
7.07"
179.6 mm
5.00"
127 mm
22.78"
578.6 mm
31.06"
789 mm
7065-SB12
12"
304.8 mm
8.49"
215.5 mm
6.00"
152.4 mm
24.78"
629.4 mm
35.06"
890.6 mm
7065-SB16
16"
406.4 mm
11.31"
287.4 mm
8.00"
203.2 mm
28.78"
731 mm
43.06"
1094 mm
*7065-SB7.5 cannot be used with 45° rudders.

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3.2 HYDRAULIC
Exercise safety precautions pertaining to hydraulics including:
•Wearing safety glasses.
•Exhausting pressure and locking out the pressure
source.
•Being qualified to work on hydraulics.
•Never look for a leak by running your hand/fingers
along a pressurized hydraulic line.
Before connecting the hydraulic lines to the cylinder ensure that all the hydraulic lines in the
steering system have been flushed and that the hydraulic oil is free of any contamination. The
cleanliness of the system must be at an ISO 4406 rating of 20/18/15 or better.
All connections are made to the valve. Hydraulic connections are specified in Figure 2 on page
7. The pressure line should have a minimum pressure rating of 2250 psi. Pressure and tank
lines should also have an isolation valve. If required, a secondary slave cylinder can be
connected to the valve which allows for additional rudder torque. Secure the piping against
vibration with pipe clamps spaced every 3 feet (1 m).
ISO VG 32 is recommended for most steering system installations. If the environment is
exceptionally warm or cold, then viscosity grades 46 or 22 should be considered, respectively.
Do not use transmission or brake oil.
Failure to flush the system can result in premature failure of cylinder
components and seals.