Bosch REXROTH HYDROTRAC GFT 8000 User manual

Operating Instructions
RE 79022-01-B/04.2020
Replaces: 03.2019
English
HYDROTRAC GFT 8000
Hydrostatic drives for mobile applications
Series 40
Sizes 8105 - 8190

The data specified above serve to describe
the product. If there is also information on
the intended use, it is meant only as
examples of use and suggestions. Catalog
information does not constitute guaranteed
properties. The information given does not
rel
ease the user from obligation of own
judgment and verification. Our products are
subject to a natural process of wear and
aging.
© This document, as well as the data,
specifications and other information set
forth in it, are the exclusive property of
Bosch Rexroth AG. It may not be reproduced
or given to third parties without its consent.
The brand, product and company names,
which are mentioned in this operating
instructions, are registered trademarks of
their respective owners. The copying or
changing o
f products with registered
trademarks is not permitted without the
permission of the respective owner.
A CE marking of the gearboxes as well as the
EC declaration of conformity are not
necessary, because the gearboxes are not a
machine for the purposes of
the EC-
machine
directive.
An example configuration is shown on the
title page. The delivered product may,
therefore, differ from the product which is
pictured.
The original operating instructions were
created in the German language.

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Contents
1About this documentation 5
1.1 Validity of the documentation 5
1.2 Required and supplementary documentations 5
1.3 Presentation of information 6
1.3.1 Safety instructions 6
1.3.2 Symbols 7
1.3.3 Terminology 7
1.3.4 Abbreviations 8
2Safety instructions 9
2.1 About this chapter 9
2.2 Intended use 9
2.3 Improper use 9
2.4 Qualification of Personnel 10
2.5 General safety instructions 10
2.6Product and technology-dependent safety instructions 11
2.7 Personal Safety Equipment (PSA) 14
3General information concerning damage to property and product damages 15
4Scope of supply 18
5About this product 19
5.1 Performance description 19
5.2 Product description 19
5.2.1 Application conditions 19
5.3 Description of the brake 20
5.4 Product overview 21
5.5 Identification of the product 22
5.5.1 Standard name plate 22
6Transport and storage 23
6.1 Transporting the HYDROTRAC GFT 8000 23
6.2 Storing the HYDROTRAC GFT 8000 24
6.2.1 Preservation 24
6.2.2 Maximum storage periods 25
7Assembly 26
7.1 Unpacking 26
7.1.1 Delivery on pallet 26
7.1.2 Delivery in wood transport box 27
7.2 Installation conditions 27
7.3 Installation position 28
7.3.1 Operation with axial-piston motor (if included in the scope of supply) 28
7.4 Required tools 28
7.5 Assembling the HYDROTRAC GFT 8000 29
7.5.1 Preparing assembly 29
7.5.2 Installing the planetary gearbox with assembled axial-piston motor into the
machine or chassis frame 30
7.5.3 Connecting the planetary gearbox's axial-piston motor to the hydraulic system 32
7.5.4 Installing the planetary gearbox with axial-piston motor connection (axial-
piston motor is not included in the scope of supply) 33

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7.6 Connecting the static multiple-disk parking brake 35
7.7 Performing a flushing cycle 36
7.8 Assembling mounting parts 36
7.9 Equipment variants 37
7.10 Completing the assembly 37
8Commissioning 38
8.1 Initial commissioning 38
8.1.1 Initial commissioning the axial-piston motor/axial-piston motor connection 39
8.1.2 Before filling the planetary gearbox with lubricating oil 39
8.1.3 Filling the planetary gearbox with lubricating oil 39
8.1.4 Filling lubricating oil via the oil filler opening on the cover side 40
8.1.5 Filling lubricating oil via the oil filler opening on the motor side 41
8.1.6 Completing commissioning and run-in period 43
8.2 Recommissioning after standstill 43
9Operation 44
10 Servicing and repair 45
10.1 Cleaning and care 45
10.2 Inspection 46
10.2.1 Visual inspections 46
10.2.2 Checking the oil level of the planetary gearbox via the cover side 46
10.2.3 Checking the oil level of the planetary gearbox via the motor side 48
10.2.4 Acoustic inspections 49
10.2.5 Checking and tightening screw connections 49
10.3 Maintenance schedule planetary gearbox 50
10.4 Maintenance 50
10.4.1 Approved lubricating oils 50
10.4.2 Changing the lubricating oil via the cover side 51
10.4.3 Changing the lubricating oil via the motor side 52
10.4.4 Maintaining the static multiple-disk parking brake (if included) 54
10.5 Repair 54
10.5.1 Repairing the static multiple-disk parking brake 55
10.6 Spare parts 56
11 Decommissioning 57
12 Disassembly and replacement 58
12.1 Required tools 58
12.2 Preparing the disassembly 58
12.3 Disassembling the planetary gearbox from the machine or chassis frame 59
12.3.1 Draining the lubricating oil via the cover side: 60
12.3.2 Draining the lubricating oil via the motor side: 60
12.4 Preparing the planetary gearbox for storage reuse 62
13 Disposal 63
13.1 Environmental protection 63
14 Extension and conversion 64
15 Troubleshooting and fault correction 65
15.1 Troubleshooting procedure 65
16 Technical data 67
17 Appendix 67

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1 About this documentation
1.1 Validity of the documentation
This documentation is valid for the following product:
• HYDROTRAC GFT 8000 series 40
These general operating instructions of the hydrostatic drive HYDROTRAC GFT
8000 describes the following configurations:
• Planetary gearbox with connection options for:
– Axial-piston motor
• Planetary gearbox (depending on the scope of supply) with :
– Mounted axial-piston motor
– Integrated static multiple-disk parking brake
– Disconnect mechanisms
 For the valid configuration of your hydrostatic drive HYDROTRAC GFT 8000, see
the chapters “Product description”, “Scope of supply” and appendix D
“Technical data / Drawings” of the material number-specific operating
instructions.
 Also observe the respective chapters of these general operating instructions.
For simplification purposes, the product is referred to as “HYDROTRAC GFT 8000
planetary gearbox” or as “planetary gearbox” in the following chapters.
This documentation addresses installers/service technicians/machine or vehicle
operators.
This documentation contains important information on the safe and appropriate
transport, storage, assembly, commissioning, use, maintenance, disassembly and
simple troubleshooting of the planetary gearbox.
 Please read this documentation completely and in particular the chapter
2 “Safety Instructions” and chapter 3 “General information concerning damage
to property and product damages”, prior to working with the planetary gearbox.
1.2 Required and supplementary documentations
 Please only commission the planetary gearbox once the documentation marked
with the book icon has been made available to you and make sure you have
read, understood and followed it.
Table 1: Required and supplementary documentations
Description
Document type
Material number-specific operating
instructions
Operating instructions (included within
Rexroth's scope of supply)

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1.3 Presentation of information
So that you can work with this documentation fast and with certainty when using
your planetary gearbox, uniform safety instructions, icons, terminology and
abbreviations are being used. For better understanding, these are explained in the
following sections.
1.3.1 Safety instructions
In this documentation, safety notes are located in chapter 2.6 “Product and
technology-dependent safety instructions” and in chapter 3 “General information
concerning damage to property and product damages”, as well as before any
sequence of actions, or sequence of instructions, where there is a danger of
damage to persons or property. The measures described for avoiding hazards must
be observed.
The safety instructions are structured as follows:
• Warning symbol: draws attention to the danger
• Signal word: identifies the degree of the danger
• Type and source of danger: identifies the type and source of danger
• Consequences: describes what occurs if the safety instructions are not complied
with
• Precautions: states how the danger can be avoided.
Table 2: Danger categories according to ANSI Z535.6
Warning symbol, signal word
Meaning
DANGER identifies a dangerous situation where death or
serious personal injury will result if it is not avoided
WARNING
identifies a dangerous situation where death or
serious personal injury may result if it is not avoided
CAUTION identifies a dangerous situation where mild to medium
personal injury will result if it is not avoided
NOTE
identifies damage to property: The product or the
environment can get damaged.
SIGNAL WORD
Type and source of danger
Consequences in the case of non-compliance
 Measures for danger aversion
 <List>

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1.3.2 Symbols
The following symbols identify information which is not relevant for safety,
however, does increase the coherency of the documentation.
Table 3: Meaning of symbols
Symbol
Meaning
If this information is not observed, the product cannot be optimally
used and/or operated.

individual, independent action step
1
2
3
numbered action instructions:
The figures show that the action steps follow on each other.
1.3.3 Terminology
The following terminology is used in this documentation:
Table 4: Terminology
Name Meaning
HYDROTRAC
Registered trademark
GFT 8000
GF
= Vehicle gearbox
T = Turas
8000 = Size (e.g. 8130)
Ri Chan Jia HE L-HL15 Hydraulic oil
PERIGOL VCI 230 Preservative
CUSTOS 10-38 Preservative
HAKUTEX 74 Detergent to remove preservative
HAKUPUR 236 Detergent to remove preservative
L-XBCHA3 (GB 7324-
94)
FAG Arcanol MULTI3
Klüberplex BE 31-222
Lithium multi-purpose grease
Screw plug
Metallic screw, pressure-resistant
Plug
Made of plastic, not pressure-resistant, only for transport

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1.3.4 Abbreviations
The following abbreviations are used in this documentation:
Table 5: Abbreviations
Abbreviation
Meaning
RE
Rexroth-Document in English Language
RDE
R
exroth-Document in German (
D
) and
E
nglish Language
DIN
D
eutsche
I
ndustrie
N
orm (German Industrial Standard)
ISO
I
nternational
O
rganization for
S
tandardization
(Internationale Normierungsorganisation)
SAE
S
ociety of
A
merican
E
ngineers
ANSI
A
merican
N
ational
S
tandard
I
nstitute
PSA
Personal Safety equipment (A)

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2 Safety instructions
2.1 About this chapter
This HYDROTRAC GFT 8000 planetary gearbox was produced according to the
generally approved good engineering practice. There is, however, still a danger of
personal injury or damage to equipment if the following chapter and the safety
instructions of this documentation are not complied with.
 Read this documentation thoroughly and completely before working with the
HYDROTRAC GFT 8000 planetary gearbox.
 Keep the documentation in a place where it is accessible at all times to all
users.
 When passing on the HYDROTRAC GFT 8000 planetary gearbox to third parties,
always do so together with the required documentation.
2.2 Intended use
The planetary gearbox is a subassembly.
 Refer to the material number-specific operating instructions for the intended
use of your HYDROTRAC GFT 8000 planetary gearbox.
 Observe the operating conditions and power limits as mentioned in the
technical data sheet. For this refer to the material number-specific operating
instructions.
The planetary gearbox is intended only for professional use and not for private
use.
Intended use includes that this documentation, especially chapter 2 “Safety
instructions” has been read and understood.
2.3 Improper use
Any use other than described in intended use is not in accordance with the
requirements and, therefore, is not permitted.
Bosch Rexroth AG assumes no liability for damage resulting from improper use.
The risks associated with improper use lie solely with the user.
Also the following expected foreseeable misuses are not improper use (this list is
not exhaustive):
• Use outside the operating data released in the specifications or the order
confirmation
• The use of inadmissible liquids, e.g. water or unreleased lubricating oils
• The use of the planetary gearbox in other applications than described in
chapter 2.2 “Intended use”
• The use of the planetary gearbox and its mounting parts in explosion-prone
environments
• The use of the planetary gearbox as a safety-related part of a control unit
• The use of the planetary gearbox in an environment with aggressive substances
and gases
• Change of the factory settings by unauthorized persons
• The use of the planetary gearbox when the external pressure exceeds the
internal pressure (housing pressure)

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• The use of mounting parts (e.g. attached filter, controller, valves) other than the
intended Rexroth components
2.4 Qualification of Personnel
The operations described in this documentation require basic knowledge of
mechanics, electrics, hydraulics as well as knowledge of the related technical
terms. Transport and handling of the planetary gearbox require additional
knowledge of handling a crane or forklift (e.g. crane/forklift training, crane/forklift
driver’s license) and the associated means of attachment.
In order to ensure the safe use, all operations should therefore only be carried out
by a respective qualified personnel or an instructed and trained person under the
direction of qualified personnel.
Qualified personnel are those who can recognize possible hazards and institute
the appropriate safety measures due to their professional training, knowledge and
experience, as well as their understanding of the relevant regulations pertaining
the work to be done. Specialists must comply with the applicable specialist
regulations.
2.5 General safety instructions
• Observe all binding regulations for accident prevention and environmental
protection.
• Observe all safety instructions and provisions of the country where the planetary
gearbox is going to be deployed/operated.
• Only use Rexroth products which are in perfect technical condition.
• Observe all instructions on the planetary gearbox.
• Persons, who assemble, commission, operate, disassemble, or maintain Rexroth
products must not consume alcohol, drugs or pharmaceuticals that may affect
their ability to respond.
• Only use Rexroth original accessories and spare parts in order to prevent any
hazards to persons due to improper spare parts.
• You may only start using the HYDROTRAC GFT 8000 planetary gearbox once it
has been established that the end product (see intended use of the material
number-specific operating instructions) in which the Rexroth-products are
installed complies with the country-specific provisions, safety regulations and
standards of the application.
• The assembly, commissioning, maintenance and disassembly of the HYDROTRAC
GFT 8000 planetary gearbox takes place under the responsibility of the end-
product manufacturer. Therefore, the product safety of the HYDROTRAC GFT
8000 planetary gearbox cannot be guaranteed by Rexroth during these life
phases.
• You must adhere to the technical data, operating conditions and performance
limits shown in the product documentation.
• The warranty shall apply to the delivered configuration only.
• The warranty is void in case of faulty installation, commissioning and operation,
as well as in case of improper use and/or improper handling
• You may not modify the HYDROTRAC GFT 8000 planetary gearbox in principle.

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2.6 Product and technology-dependent safety instructions
The following safety instructions apply to chapters 6 to 14.
WARNING
Danger during all works on the HYDROTRAC GFT 8000 planetary gearbox during
the operation of the machine or the vehicle!
Mortal danger, risk of severe injury or damage to property during working!
 Secure the entire unit against restarting.
 Relieve any system pressure in the relevant part of the machine or vehicle
before you start working on the planetary gearbox.
 Switch the relevant machine or vehicle part completely free of voltage before
you start working on the planetary gearbox.
 Do not loosen any cable connections, connections or components on the
planetary gearbox, as long as the planetary gearbox or the machine, the
vehicle part is under oil pressure and under voltage.
Fire hazard caused by fire, smoking and naked light!
Risk of injury or damage to property from combustible materials, as for example:
Lubricating oil, preserving agent, solvent, detergents and hydraulic fluid!
 In dealing with combustible materials, please observe the product data sheets
and safety data sheets of the respective manufacturer.
 Do not use fire or naked light when working on the planetary gearbox, its
mounting parts and when handling with combustible materials.
 Do not smoke in the vicinity of combustible materials.
 Always wear the protective equipment which is specified in the safety data
sheets of the respective substance.
 When the planetary gearbox is positioned near ignition sources or heat
radiators, a shield must be installed so that leaking hydraulic fluid cannot
ignite and hoses are protected against premature aging.

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WARNING
Risk of toxicity and injury!
Risk of toxicity and injury by contact with harmful substances, as for example:
Lubricating oil, preserving agent, solvent, detergents and hydraulic fluid!
 In dealing with harmful substances, please observe the product data sheets
and safety data sheets of the respective manufacturer.
 Always wear the protective equipment which is specified in the safety data
sheets of the respective substance.
 Carefully wash off harmful substances that have come into contact with the
skin. Wash out your eyes thoroughly with water if harmful substances have
gotten into the eyes and go see a doctor.
 See a doctor immediately if you have inhaled, for example, solvent-based
detergents or have swallowed harmful substances.

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CAUTION
Locally hot surfaces on the gearbox!
Danger of burns!
 Do not touch any hot surfaces on the planetary gearbox.
The planetary gearbox
heats up to a max. of 90 °C during operation in the oil sump.
 Allow the planetary gearbox and its mounting parts to cool down to approx.
50 °C before touching.
 To protect yourself from burns, wear heat-resistant protective clothing and
heat-resistant safety gloves.
Hot lubricating oil during operation!
Danger of scalding during oil change, oil sampling and draining oil!
 To protect yourself from scaldings, wear heat- and oil-resistant safety gloves
and heat-resistant protective clothing. Wear protective goggles.
 Avoid oil temperatures of much more than 50°C when taking oil samples or
draining oil.
 When taking the oil sample or draining the lubricating oil, carefully open the
oil sampling point or oil drain.
Sharp edges and tensioned tension belts and cable fasteners as well as
rebounding parts!
Risk of injury!
 Carefully remove any attached tension belts and chains.
 When cutting tension belts and detaching chains, always wear protective
goggles and cut-resistant safety gloves.
Danger in the case of mix-up with metrical and inch threads!
Risk of injury and damaging to the gearbox!
 Only assemble the planetary gearbox, if you have the dimensioned drawing
available, indicating the thread types and sizes.
Danger in the case of faulty installation of cables and lines!
Risk of injury or property damage!
 Lay cables and lines so that they cannot be damaged and no one can trip over
them.
Metal particles or metal abrasion in the lubricating oil or on screw plugs!
Risk of injury!
 When refilling the lubricating oil, during the oil change and when draining oil,
always wear oil-resistant safety gloves and protective goggles.

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CAUTION
Setting down the planetary gearbox on unsuitable, non-load-bearing base!
Risk of injury or property damage by tipping over the planetary gearbox!
 Always load the planetary gearbox on a load-bearing surface.
 Secure the planetary gearbox against tipping over by the use of chocks,
wooden bars or the load boards provided by Rexroth.
Leaking hydraulic fluid due to leakages of the machine or vehicle!
Risk of burns and injuries due to leaking oil jet!
 Relieve any system pressure in the machine or vehicle and repair the leak.
 Never try to stop or seal the leak or oil jet using a cloth.
2.7 Personal Safety Equipment (PSA)
The personal safety equipment for users of the planetary gearbox comprises:
• Safety gloves
The required characteristics of the safety gloves are determined by the conditions
encountered in practice.
 Wear resistant safety gloves of the corresponding classification (according to
action step, for example, heat-resistant, oil-resistant, cut-resistant).
• Protective goggles (sealed)
• Safety shoes
• Heat-resistant safety wear, if necessary, flameproof protective clothing
• If necessary, safety helmet
 When in contact with lubricating oil, preserving agents, solvents, detergents
and hydraulic fluid, please wear the mandatory safety equipment as outlined in
the respective product data sheets and safety data sheets.
All components of the personal safety equipment must be intact.

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3 General information concerning damage
to property and product damages
The following instructions apply to chapters 6 to 14.
NOTE
Danger caused by improper handling!
The planetary gearbox can be damaged!
 Do not submit the planetary gearbox to mechanical load in an unacceptable
way.
 Do not place any objects on the product.
 Do not hit against sensitive mounting parts (e.g. sensors or valves).
 Do not hit against sealing surfaces (e.g. on the axial piston motor working
connections (if included in the scope of supply)).
 Leave the protective cover on the axial piston motor (if included in the scope
of supply) until just before connecting the cables.
Damage of the planetary gearbox caused by a lack of knowledge when handling
the crane and the slinging equipment!
Lack of knowledge when handling a crane, or wrong slinging equipment, may lead
to uncontrolled movements of the planetary gearbox and therefore damage the
machine or vehicle!
 Use a crane with sufficient lifting capacity for lifting the planetary gearbox.
 Only use approved transport equipment.
 Use e.g. eye bolts, straps, chains, swivel hooks, shackles or suitable
equipment as slinging equipment.
Damage caused by improper assembly!
Improper assembly may lead to damage of the planetary gearbox respectively the
machine or vehicle!
 Make sure that the planetary gearbox has been properly mounted by qualified
personnel before operating it.
Damage to the planetary gearbox caused by improper installation!
Material damage to the planetary gearbox or its mounting parts!
 Assign or close all necessary connections properly, particularly the one of the
static multiple-disk brake.
 Only commission a completely installed product.
 Take the required connections from the dimensioned drawing in appendix
D “Technical data / Drawings” of the material number-specific operating
instructions.

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NOTE
Damage to the planetary gearbox caused by commissioning without or with
insufficient lubricating oil!
When commissioning the planetary gearbox and the integrated static multiple-
disk parking brake without, or with insufficient lubricating oil can damage or
even
being completely destroyed!
 When commissioning or recommissioning the machine or a vehicle, fill the
planetary gearbox with the correct quantity of oil.
 Control the oil level thoroughly.
 Pay attention when commissioning the machine or vehicle, that the housing
chamber and the axial-
piston motor (if included in the scope of supply) service
lines are filled with hydraulic fluid and remain filled during operation.
 Always replace the disks, the springs and the sealing elements per axle after a
functional impairment or thermal overload and by any repair work on the
multiple-disk parking brake.
Damage to the planetary gearbox caused by commissioning with too much
lubricating oil!
When commissioning the planetary gearbox and the static multiple-disk parking
brake, integrated in the planetary gearbox, with too much lubricating oil, thermal
overloads may occur, causing damage to the gears, seals and bearings as well as
failure of the static multiple-disk brake!
 When commissioning or restarting the machine or a vehicle, fill the planetary
gearbox with the correct quantity of oil.
 Check the oil level carefully.
 Always replace the disks, the springs and the sealing elements per axle after a
functional impairment or thermal overload and by any repair work on the
multiple-disk parking brake.
Damage caused by penetrating liquids, foreign objects and dirty lubricating oil!
Wear and malfunctions caused by impurities!
 Check whether all seals, connections and plug-in connectors have been
correctly installed and are intact.
 When performing any work on the planetary gearbox, please ensure extreme
cleanness to prevent foreign objects, as for example weld spatter or metal
particles, from getting into the planetary gearbox and, therefore, causing wear
and malfunction.
 Only use clean connections.
 Exclusively install clean hydraulic lines.
 No dirt shall penetrate when closing the ports.

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NOTE
Damage to the planetary gearbox caused by cleaning agents or solvents!
Damage caused by aggressive detergents or solvents and/or fiber from cleaning
cloths getting into the planetary gearbox.
 When removing the preserving agent make sure that no aggressive detergents
or solvent enters the seal areas, the hydraulic system, or the planetary
gearbox.
 Only use a dry cloth made of lint-free fabric to remove lubricating oils and
other soils.
Damage to the planetary gearbox caused by mechanical stress!
Oil lines and hoses which you install under tension cause additional mechanical
stress during operation, which reduces the service life of the gearbox!
 Assemble hydraulic lines and hoses without mechanical stress.
 Ensure vibration-free fastening of tubings.
 Only use hoses and fasteners which have been approved for the respective
operating pressure range.
Risk of environmental pollution!
Ground water and/or soil contamination by escaping or spilled lubricating oil or
pressure medium!
 Place a catch basin with sufficient capacity under the planetary gearbox when
replacing, draining lubricating oil, or working with a pressure medium.
 Bond any passing flow of lubricating oil or spilled lubricating oil or pressure
medium with appropriate absorption material such as oil absorbent granule.
 Dispose the lubricating oil or pressure medium in accordance with local
country regulations and provisions.
 Observe the product data sheets and safety data sheets of the lubricating oil
manufacturer and pressure medium manufacturer. These data sheets are not
included within Rexroth's scope of supply.
Damage to the planetary gearbox caused by improper handling!
Damage to the planetary gearbox during installation into the machine or chassis
frame, maintenance and repair work and during disassembly!
 Avoid strong impacts on the planetary gearbox during assembly or
disassembly.
 Never use the mounting parts as a handle or step.
 Make sure that the planetary gearbox is not canted.
Damage to the planetary gearbox and mounting parts!
Material damage caused by securing and lifting equipment!
 When lifting the planetary gearbox, take care that mounting parts do not get
damaged by securing or lifting equipment.
Insufficient lubrication!
Damage to the planetary gearbox and mounting parts!
 Supply the gearbox with a sufficient lubricating oil amount in all modes of
operation.

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NOTE
Any irregularities manifesting during maintenance and inspection!
Damage to the planetary gearbox and its mounting parts!
 Take the planetary gearbox out of service and contact the nearest Rexroth
Service point, if you find any irregularities during maintenance work or
inspections.
No timely inspection and maintenance work!
Risk of damage!
 Adhere to the planetary gearbox’s maintenance intervals schedule when
carrying out mandatory maintenance work.
4 Scope of supply
Refer to your material number-specific operating instructions for the complete
scope of supply.

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5 About this product
5.1 Performance description
 For the performance-related data of the HYDROTRAC GFT 8000 planetary
gearbox, please refer to appendix D “Technical data / Drawings” of the material
number-specific operating instructions.
5.2 Product description
The HYDROTRAC GFT 8000 hydrostatic drive is a planetary gearbox.
The following product description includes different models. For details of your
planetary gearbox, refer to the chapter “Product description” as well as the
chapter “Scope of supply” and the dimensioned drawing provided in appendix D
“Technical data / Drawings” of the material number-specific operating instructions.
This is where you find details on:
• Number of planetary stages
• Transmission ratio
• Motor type and design
• Integrated static multiple-disk parking brake
• Mounting parts
• Connections
• Special equipment
• Lubrication, etc.
The entire planetary gearbox, which is mounted in rolling bearings, is equipped
with a splash oil lubrication. The externally toothed planet gears are case-
hardened.
A special output seal ensures optimum protection against dust and dirt of the
output bearing.
Drive and output have opposite direction of rotation.
The planetary gearbox is intended exclusively for use in the technical environment
approved by Rexroth for the application referred to in the material number-specific
instructions.
5.2.1 Application conditions
The planetary gearboxes are designed for use in environmental temperatures
between -25°C and + 40°C. Environmental factors such as salt water, salt air,
sand, dust, pressure, severe shocks, extreme shock loads and environmental
temperatures, aggressive media, etc. affect the function. Such influences must be
pre-announced in order for a secure gearbox design.

20/70 About this product
Bosch Rexroth AG, General Operating Instructions HYDROTRAC GFT 8000 series 40, RE 79022-01-B/04.2020
5.3 Description of the brake
Depending on the scope of supply, the planetary gearbox is equipped with a wet-
running, integrated static multiple-disk brake (multiple-disk parking brake).
WARNING
Risk caused by the failure of the static multiple-disk parking brake!
The use of the static multiple-disk parking brake for braking the vehicle may
cause its destruction.
 Operate the static multiple-disk parking brake only after a complete stop of
the vehicle.
 Always replace the disks, the springs and the sealing elements per axle after a
functional impairment or thermal overload and by any repair work on the
multiple-disk parking brake.
Danger of delayed stopping of the static multiple-disk parking brake!
Delayed application of the static multiple-disk parking brake can lead to
accidental rolling of the vehicle.
 Please ensure that the brake line of the static piston is pressureless within
0.5 s.
The multiple-disk brake is a hydraulically released brake. The multiple-disk brake
is used as a parking brake as standard. The parking brake (static multiple-disk
parking brake) is applied via the brake release connection.
The static multiple-disk parking brake acts negatively, i.e. it is released by means
of pressure fluid and applied by spring action when pressureless.