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Maintenance and Installation Instructions

 

Edition 11.07.2006 

4 of 30 

Description 

Preface 

This  documentation  has  been  developed  for  the  skilled  Serviceman,  trained  by  ZF  for  the  Repair  and 
Maintenance operations on ZF-Units. 
 

Treated is a ZF-Serial product according to the design stage of the date of Edition. 

 

However, due to further technical developments of the product, the repair of the unit at your disposal could 
require different steps as well as other adjustment and testing specifications. 
 
Therefore, we recommend to commit your ZF-Product to Masters and to Servicemen, whose practical and 
theoretical training is constantly completed to the actual situation in our Training School. 
 
The Service Stations, established by the ZF Friedrichshafen all over the world, offer you: 
 

1. Constantly trained personnel 

 

2. Prescribed installations, e.g. Special Tools 

 

3. Genuine ZF-Spare Parts according to the latest phase of development 

 
Here, all operations are carried out for you with utmost care and reliability. 
 
Repair  operations  carried  out  by  ZF-Service  Stations,  are  covered  additionally  within  the  terms  of  the 
actual contractual conditions, by the ZF-Warranty. 
Damages  caused  by  inappropriate  or  inexpert  work,  carried  out  by  personnel  foreign  to  ZF,  and  after-
expenditures eventually arising from it, are excluded from this contractual responsibility. 
This applies also in case of a renouncement of Genuine ZF-Spare Parts. 
 
We did not go into detail for disassembly, reassembly and repair of accessory parts. 
Please observe the respective instructions and manuals of the vehicle manufacturer. 
Basically all pictures are without any obligation and only serve as illustrative material and for better 
understanding purposes. 
 
Important information on industrial safety: 
 
Generally, the persons repairing ZF-units are responsible on their own for the industrial safety.  
The  observation  of  all  valid  safety  regulations  and  legal  impositions  is  the  pre-condition  for  avoiding 
damage to persons and to the product during maintenance and repair works.  
Persons performing repair works must familiarize themselves with these regulations.  
The proper repair of these ZF-products requires the employment of suitably trained and skilled staff.  
The repairer is obliged to perform the training. 
Important information with reference to technical reliability and operational safety are outlined by the 
following symbols: 
 
 

 

DANGER  

This symbol refers to situations where lacking care can lead to 

personal

 

injury

 or 

damage on the product

 

 

CAUTION  

This symbol in these operating instructions serves as a 

reference

 to special 

working procedures, methods, information, the use of auxiliaries, etc. 

 

Summary of Contents for GK20

Page 1: ...1 07 2006 For possible technical modifications of the product described in this manual ZF Gotha GmbH reserve the right to change the product documentations if necessary Technical modifications are to...

Page 2: ...nadequate use of the transmission or the drive unit insufficient maintenance improperly and incompetently performed work and the resulting consequential damages faulty operation ZF Gotha GmbH reserve...

Page 3: ...ge 9 Transport 9 Removal of the corrosion protection 9 Attachment of the Electric Motor 10 Attachment of the electric motor to the transmission 10 Pivoted Connection Steering 12 Mounting of the gear r...

Page 4: ...mission types GK 20 GK 25 GK 30 25 Oil grade for transmission type GK 40 25 Oil capacity 25 Maintenance intervals Transmission 26 Oil Change 26 Drain the transmission oil at GK 20 GK 25 GK 30 26 Drain...

Page 5: ...el foreign to ZF and after expenditures eventually arising from it are excluded from this contractual responsibility This applies also in case of a renouncement of Genuine ZF Spare Parts We did not go...

Page 6: ...ied by ZF are not checked and approved by us either We do not accept any liability or admit any warranty for damages caused by the use of spare parts and accessories which are no original parts from Z...

Page 7: ...g pinion is shown or steering chain as alternative Item 04 Mounting holes optional Item 05 one piece pivoted bogie bearing optional Item 06 Wheel shaft with centering and locating face for drive wheel...

Page 8: ...n housing on the bearing cover side Figure 02 The model identification plate is fixed to the transmission housing side Technical data of the transmission is indicated on the model identification plate...

Page 9: ...20 145 M 12 79 115 135 M 14x1 5 135 200 235 M 14 125 185 215 M 16x1 5 205 300 360 M 16 195 280 330 M 18x1 5 310 440 520 M 18 280 390 460 M 18x2 290 420 490 M 20 390 560 650 M 20x1 5 430 620 720 M 22 5...

Page 10: ...speed of 1000 to 1500 min the transmission is to be driven for approx 2 minutes so that all transmission internal parts are wetted with oil If this is ensured the oil can be drained off again We recom...

Page 11: ...pecial lubrication grease BEM 34 132 onto the splined shaft hub connection Assemble the electric motor Item 1 into the centering seat of the pivot bogie bearing Item 2 and join it cautiously with the...

Page 12: ...tenance and Installation Instructions Edition 11 07 2006 11 of 30 Example for the electric motor attachment without centering ring connection directly to the pivoted bogie bearing Figure 04 05 03 01 0...

Page 13: ...that the boltholes in the pivoted bogie bearing are aligned with the hole pattern of the gear ring and the housing 6 Fasten the pivoted bogie bearing and the gear ring on the mounting construction by...

Page 14: ...A Dim B 0 05 to 0 25 mm bearing preload e Prepare the required shim ring thickness and insert it Figure 07 In order to obtain the bearing preload a gap of 0 05 0 25 mm must exist before between the ho...

Page 15: ...mission housing is positioned into the fitting bore in the transmission top section k Bolt together the transmission top section and the transmission by means of Allen screws Item 02 l The transmissio...

Page 16: ...ion Demounting of the pivoted connection is basically made in reverse order of the mounting Checking of fixing bolts of the pivoted connection The fixing bolts of the pivoted connection see Fig 05 Ite...

Page 17: ...rt water etc the mounting type of the pivoted connection Prior to every relubrication procedure it is necessary to clean the teeth in particular the tooth root Exact relubrication intervals can only b...

Page 18: ...Item 01 on the chain flange Item 02 is made by a chain tensioner Item 03 with an adjustable element Item 04 Sixteen 16 holes Item 05 on the plane face of the chain guideway allow fixing of the chain t...

Page 19: ...ion that no foreign substances or cleaning agents get through the threaded holes Item 01 of the mounting construction hole pattern of the housing inside the transmission 3 Place the chain flange Item...

Page 20: ...ry to use new screws Mounting of the chain tensioner 1 Hang the chain tensioner Item 03 into the requested position on the chain guideway and swivel it so that the tensional pin Item 09 can be hit in...

Page 21: ...ping at the steering stop it is required to consider thrust factors up to 2 5 Pay attention to dampened final stops enabling to obtain as low as possible tractive forces of the chain so that small cha...

Page 22: ...ing chains are currently approved by ZF for GK40 etc see Fig 16 Page 21 Mounting dimensions in mm Single roller chain D E F 10B 1 5 8 x 3 8 335 16 DIN 8187 E 10B 1 DIN 8181 E 210B 12B 1 x 7 16 337 07...

Page 23: ...machining Inadmissible distortions or deformations during fastening of the screws occur due to uneven locating on the frame plate or unevenness in the locating area of the pivoted bogie bearing The pi...

Page 24: ...limited carrying capacities and maximum speeds Damaged worn or deformed drive wheels are not allowed to be repaired or mounted Pay attention that mounting of the drive wheel and the appropriate wheel...

Page 25: ...tructions Edition 11 07 2006 24 of 30 Figure 18 After mounting of a wheel it is mandatory to retighten the wheel nuts and wheel bolts respectively with the specified torque after a mileage of approx 5...

Page 26: ...cants TE ML 17 Lubricant class 17A and 17B Detailed data to the oils grades is found in the Internet under the below mentioned address www zf com Products for Techn Information List of Lubricants The...

Page 27: ...quire the written approval by ZF Oil Change Drain the transmission oil at GK 20 GK 25 GK 30 Do not drain transmission oil into the soil or the sewerage system Pay attention to the type and quantity of...

Page 28: ...n ground and lock the wheels for safety purposes Carefully clean the area around the oil filler and oil drain plug Place a suitable big oil collecting vessel under the oil drain plug Loosen the oil fi...

Page 29: ...t least when oil penetrates at the oil filler plug Attach the oil filler plug Item 01 with a new sealing ring Item 02 Tightening torque 22 Nm Figure 21 Fill in the transmission oil at GK 40 Possibilit...

Page 30: ...ved when the oil level is at the lower edge of the oil filler plug at least when oil penetrates at the oil filler plug Attach the oil filler plug Item 01 with a new sealing ring Item 02 Tightening tor...

Page 31: ...ing torque 34 Nm Oilchange Greasing of the teeth on the pivoted connection Visual inspections Visual inspection for oil leakage General condition of the pivoted connection for extreme conditions see C...

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