Hydro UTOWE170-C-4 Guide

Operating Instructions
+
Spare Parts List
Tow Bar
UTOWE170-C-4
Serial number:....................................................
Year of Construction: ...........................................

12.06.7 UTOWE170-C-4
Page I
Record of Revisions
The basic issue of this manual for the UTOWE170-C-4 was published
in June 2009:
09.06.0
year month revision number
Revision No. Chapter Revised Pages Date Inserted By
10.12.3 5 33 December 16, 2010 K. Harris
12.03.4 Multiple II, III, V, 6, 19,
20, 29, 30, 31 March 6, 2012 A. Dumbrava
12.05.5 5 III-V, 27, 33 May 14, 2012 A. Dumbrava
12.05.6 5 33 May 21, 2012 A. Dumbrava
12.06.7 5 29, 30 June 29, 2012 S. Yoon

12.06.7 UTOWE170-C-4
Page II
Data sheet UTOWE170-C-4
Fig.: 1 Data sheet
Total length: 5,304.79 mm
Total width: 662.94 mm
Tube: Steel tube 127 mm O.D. X .6,350 mm WALL
Weight: 181.6 Kg
Tires: 2.4 bar
Operating temperature: - 20° C to + 60° C / (- 4° F to + 140° F)
Tow eye: revolving with shock absorber
Tow head: not revolving
Shear pin: part no 0432-0001-000, 0432-0002-000 and
0432-0003-000 for EMB. 170 - 195
Suitable for the following aircraft types:
E170 thru E195

12.06.7 UTOWE170-C-4
Page III
Table of Contents
Record of Revisions............................................................................................................I
Data sheet UTOWE170-C-4..........................................................................................II
Table of Contents.........................................................................................................III
Table of Figures............................................................................................................ V
Table of Diagrams........................................................................................................ V
Introduction.................................................................................................................. VI
0-0 SAFETY.......................................................................................................................1
0-1 Explanation of Directions Used in this Manual....................................................1
0-2 General Remarks................................................................................................2
0-3 Purpose / Use According to Intended Purpose...................................................3
0-4 Responsibility of Operators.................................................................................3
0-5 Safety Instructions ..............................................................................................4
0-6 Safety Features and Protective Devices.............................................................4
0-7 Risks Due to Hydraulic Energy ...........................................................................5
0-8 Modification of the Equipment.............................................................................6
0-9 Appropriate Disposal...........................................................................................6
0-10 Copyright.............................................................................................................6
0-11 Potential Sources of Danger...............................................................................7
1-0 DESCRIPTION.............................................................................................................8
1-1 General Information............................................................................................8
1-2 Tube Body...........................................................................................................8
1-3 Tow Eye..............................................................................................................9
1-4 Tow Head............................................................................................................9
1-5 Hydraulic Undercarriage .....................................................................................9
1-6 Safety................................................................................................................10
1-7 Spare Parts Service..........................................................................................10
2-0 OPERATION..............................................................................................................11
2-1 Transport of Tow Bar to Aircraft........................................................................11
2-2 Connection to Aircraft .......................................................................................12
2-3 Disconnection from Aircraft and Tractor............................................................15
2-4 Functional Description of Tow Head .................................................................16
3-0 MAINTENANCE.........................................................................................................17
3-1 Table of Maintenance Instructions ....................................................................17
3-2 Replacement of Shear Pins ..............................................................................19
3-3 Replacement of retaining pin ............................................................................21
3-4 Grease Requirements and Grease...................................................................22
3-5 Checking of Oil Level........................................................................................23
4-0 TROUBLE SHOOTING..............................................................................................24

12.06.7 UTOWE170-C-4
Page IV
5-0 ILLUSTRATED SPARE PARTS LIST .......................................................................26
5-1 Main towbar ......................................................................................................27
5-2 Tow head assy. 3301-0005-000........................................................................29
5-3 Tow eye 3303-0002-009..................................................................................31
5-4 Parts Kit 3303-0006-002...................................................................................33

12.06.7 UTOWE170-C-4
Page V
Table of Figures
Fig.: 1 Data sheet .....................................................................................................II
Fig.: 2 Horizontally coupled tow bar........................................................................12
Fig.: 3 Tow bar not coupled horizontally.................................................................12
Fig.: 4 Exceeding the maximum steer angle...........................................................14
Fig.: 5 Tow Head ....................................................................................................16
Fig.: 6 Replacement of shear pin and retaining pin.................................................20
Fig.: 7 Replacement of shear pin and retaining pin.................................................21
Fig.: 8 Main towbar.................................................................................................28
Fig.: 9 Tow head 3301-0005-000............................................................................30
Fig.: 10 Tow eye 3303-0002-009..............................................................................32
Table of Diagrams
Tab.: 1 Towing speed .................................................................................................3
Tab.: 2 Sources of Danger..........................................................................................7
Tab.: 3 Maintenance Instructions..............................................................................18
Tab.: 4 Grease Requirements and Grease...............................................................22
Tab.: 5 Trouble shooting...........................................................................................25

12.06.7 UTOWE170-C-4
Page VI
Introduction
This tow bar UTOWE170-C-4 was designed based on over 30 years of Hydro
experience in manufacturing tow bars. The design focus of this new product was
to combine an outstanding level of operator safety with meeting today’s
requirements for highly competitive ground support equipment.
The following safety features of the UTOWE170-C-4 are described below:
Ball Lock Pin ensures against
accidental or unexpected opening
of tow head when in use .
Flow-Valve between pump and
hydraulic cylinder which minimizes
the speed of retraction of the
undercarriage (no drops!)
Dampening tow-eye using
Urethane spring

12.06.7 UTOWE170-C-4
Page VII
Over-sized lifting handle with a
lifting weight of only eight pounds
to minimize the risk of operator
back injury
A safe operation of the equipment is only guaranteed, if the operator has read
and understood the operating instructions. Authorized personnel may only
operate the equipment.
Safety instructions are included in chapter 0-0 as well as in the chapters where
operating principles and movements are described.
Any person who is entrusted with operation, maintenance or repair of the
equipment must have read and understood these instructions, and in particular
chapter 0-0 “Safety”.
A disregard of these operating instructions and any damage resulting from such
a disregard leads to an exclusion of liability by Hydro System USA Inc.
These operating instructions cannot anticipate every potential application. For
further information or in case of problems that are not described or described
insufficiently in these operating instructions, please contact manufacturer.

12.06.7 UTOWE170-C-4
Page 1
0-0 SAFETY
0-1 Explanation of Directions Used in this Manual
Caution: Caution stands for a potentially dangerous situation.
A negligence of these directions can result in injury to a person or can cause
damage to the equipment.
Important: Important stands for an important direction for the proper
usage of the machine.
A negligence of these directions can result in damage to the machine or the
machine surroundings.

12.06.7 UTOWE170-C-4
Page 2
0-2 General Remarks
·These operating instructions are part of the equipment. They must always be
accessible to the operator, allowing the operator to inform himself.
·If the tow bar is sold, the operating instructions must be supplied with the
equipment.
·The tow bar may only be used for the purpose defined in the following
paragraph.
·The max. admissible towing speed may by no means be exceeded.
Important: Attach the tow bar to the towing vehicle's hitching point
appropriate to the towing height for the aircraft.
Warning! Take into account the tow bar's height to avoid risk of
collision into the aircraft.
Notice: The max. towing speed depends on the instructions given by
the aircraft manufacturer, the local regulations of the airport
operator as well as any applicable regulations of national
organizations and aircraft owner.
In addition, the prevailing weather conditions as well as
ambient conditions are to be taken into consideration when
selecting the towing speed.

12.06.7 UTOWE170-C-4
Page 3
Max. admissible towing speeds
without aircraft
See information sticker
P/N 10326_00
which is attached to the
product.
with aircraft
See information sticker
P/N 10325_00
which is attached to the
product.
In case of a lack of regulations
and optimum conditions, the
manufacturer recommends not
to exceed the max. towing
speed indicated on the
product.
Tab.: 1 Towing speed
0-3 Purpose / Use According to Intended Purpose
·The tow bar has been designed for towing operations of all aircraft types
listed in the data sheet, e.g. to tow the aircraft to and from its parking position
and push it out of a so-called "Nose-In-Position" at a terminal point.
·During this procedure the tow bar may only be connected to the defined
attachment point of the aircraft.
0-4 Responsibility of Operators
·Only trained and instructed personnel may work with the tow bar. The
operating instructions are to be respected.
·The personnel's responsibility for start-up, operation, maintenance and repair
of the tow bar must be clearly defined.

12.06.7 UTOWE170-C-4
Page 4
0-5 Safety Instructions
·All safety instructions and warnings on the equipment and in the operating
instructions must be respected.
·In addition to the operating instructions, the general as well as the local
regulations regarding accident prevention and environment protection must
be provided by the operator and respected.
·All safety instructions and warnings on the equipment must be kept in a
readable condition.
0-6 Safety Features and Protective Devices
·All safety features must be checked at periodic intervals.
·Before every use of the tow bar, all protective devices must be mounted and
work properly.
·Protective devices may only be removed
·if the machine is out of operation
·if safety measures have been taken to prevent a putting into operation
of the tow bar.
·After the delivery of individual components and after repair works (carried out
with the manufacturer's consent) all protective devices must be mounted
properly again.

12.06.7 UTOWE170-C-4
Page 5
0-7 Risks Due to Hydraulic Energy
·Persons with special knowledge and experience in hydraulics may only carry
out works on the hydraulic system.
·System sections and pressure lines, which have to be opened, must be
depressurized before starting with the repair works.
·Check hydraulic hose lines in regular intervals. The recommended inspection
period is 12 months.
·Immediately replace the hydraulic hose lines when damaged.
·Replace hydraulic hose lines in appropriate intervals, even if there are no
recognisable technical-safety defects. The recommended replacement
interval is six years, including a storage time of two years.
·Observe additional local and national safety regulations and guidelines for
hydraulic hose lines.
·Do not change any factory-set parameters.

12.06.7 UTOWE170-C-4
Page 6
0-8 Modification of the Equipment
·Do not make any modifications to the equipment without consent of the
manufacturer. Extensions or conversions are not allowed either.
·Any retrofit work requires a confirmation in writing from HYDRO Systems
USA Inc.
·Use only original manufacturer's spare parts.
0-9 Appropriate Disposal
Safe Environmental disposal of
·consumables (e.g. oil, lubricant)
·cleaning agents and
·the complete device when no longer used (redundant)
must be carried out using local and national disposal regulations.
0-10 Copyright
·These operating instructions are only intended for the operator and his
personnel.
·HYDRO Systems USA Inc., 2302 West Valley HWY N, Suite 100 Auburn,
WA 98001, has the copyright of these operating instructions.

12.06.7 UTOWE170-C-4
Page 7
0-11 Potential Sources of Danger
WHERE WHAT HOW TO AVOID
Mechanical
system Tow head During attachment to
the aircraft risk of
contusion for
fingers/hands.
Watch for contusion
points during attachment.
Tow eye During attachment to
the tractor risk of
contusion for
fingers/hands.
Watch for contusion points
during attachment.
During attachment risk
of contusion for legs. Do not stand between tractor and tow eye.
Height-adjustable
undercarriage (if
available).
During retraction of
undercarriage risk of
contusion for fingers in
return springs.
Keep hands away from
return springs.
Tab.: 2 Sources of Danger

12.06.7 UTOWE170-C-4
Page 8
1-0 DESCRIPTION
1-1 General Information
The tow bar has been designed for towing operations of all aircraft types listed in
the data sheet.
During these towing operations the tow bar is coupled to the defined attach
fitting on the aircraft NLG and to a suitable tractor.
Regarding the max. admissible towing speed, see table in chapter 0-2 of this
manual.
Basically, the tow bar consists of the following components:
·tube body with handles
·tow eye
·tow head with overload protection (shear pins) and retaining pin
·hydraulic undercarriage, adjustable in height
1-2 Tube Body
The tube body connects the tow eye with the tow head and accommodates the
undercarriage.
At both ends of the tube body there are handles facilitating the maneuvering
operation.
A support on the tow eye side and a support on the tow head side prevent a
crashing of the tow eye and the tow head onto the ground.

12.06.7 UTOWE170-C-4
Page 9
1-3 Tow Eye
The tow bar is delivered with a tow eye for hanging on to an appropriate tractor
(for inside diameter of the tow eye, see data sheet).
1-4 Tow Head
The tow head is the connection between tow bar and aircraft.
The tow head is designed to fit in the defined attachment fitting on the NLG of
the aircraft.
A locking mechanism prevents an unintentional opening of the tow head.
Shear pins protect the NLG against overload. An additional retaining pin
prevents a total separation of tow head and tube body.
1-5 Hydraulic Undercarriage
Basically, the undercarriage consists of the following components:
·welded tube construction
·floating axle with two air-inflated tires
·single-acting hydraulic cylinder
·return spring
·hand pump with release and safety valve.
To extend the undercarriage, the operator must activate the hydraulic cylinder
by means of the hand pump. During this process, the release valve must be
closed.
To retract the undercarriage, the operator must open the release valve. The
undercarriage returns to its upper end position by means of a return spring
system.
To transport the tow bar the undercarriage must be extended; to tow the aircraft
it must be retracted to avoid damage to the tow bar.

12.06.7 UTOWE170-C-4
Page 10
1-6 Safety
The tow bar has been so designed that damage to the aircraft nose landing
gear, which might be caused by the transmission of excessive forces on the
attach fittings, is avoided.
In overload cases the shear pins integrated in the tow head break.
A retaining pin prevents a total separation of tow head and tube body.
1-7 Spare Parts Service
Delivery of all spare parts manufactured by HYDRO is guaranteed for ten (10)
years.

12.06.7 UTOWE170-C-4
Page 11
2-0 OPERATION
2-1 Transport of Tow Bar to Aircraft
2-1-1 Check whether undercarriage is fully extended and whether release
valve (to be found on hand pump) is closed.
Important: Transport of tow bar without aircraft is only allowed with fully
extended undercarriage!
2-1-2 Connect tow eye of tow bar to coupling of tractor.
2-1-3 Move tow bar to required position at the aircraft (NLG).
2-1-4 Uncouple tow bar from tractor and tilt tow eye side carefully towards the
ground.
Attention: Note max. towing speed (see chapter 0-2).

12.06.7 UTOWE170-C-4
Page 12
2-2 Connection to Aircraft
Caution: A tow bar that is not coupled horizontally can lead to a
changed fracture behaviour of the shear bolts. In extreme
cases this can cause to damages to the nose landing gear and
to the tow bar, as well as lead to raising the landing gear.
When connecting to the aircraft make sure that the tow bar is
positioned horizontally as far as possible while connected.
Fig.: 2 Horizontally coupled tow bar
Fig.: 3 Tow bar not coupled horizontally