Our activities in the Dredging Industry

Inspection and repair on NKM gearbox

Scope of work:

- Exchanging the output pinion
- Measurements of the bronze bushings
- Replacement of the bronze bushings
- Assembly of the gearbox on board the ship
- Assembly of the output pinion
- Check the backlash between the output pinion and swivel gears
- Test run of the gearbox

Inspection and repair on OSTERMANN KNV2-250-LR gearbox

Inspection and repair on FLENDER KMP-200 gearbox

Inspection and repair on UNKNOWN gearbox

We inspected the gearbox and performed a repair. After a succesful testrun we shipped the gearbox back to the client.

We got invited to perform a visual inspection on several gearboxes on board a ship in Germany.

We inspected all the gearboxes and reported out findings back to the client.

Inspection and repair on FLENDER 058F - 1750 gearbox

Inspection and repair on LOHMANN+STOLTERFOHT GJZ-1715 gearbox

GBS International was invited by to inspect and overhaul the gearbox and the attached Pneumaflex/Pneumastar clutches.

All major preparations for disassembly, as well as removing all auxiliary equipment, piping and gearbox top cover, were carried out by the Crew and TD of the client.

The shafts of the gearbox were removed from the gearbox under supervision of GBS and transported to the GBS workshop in Oud-Beijerland for further inspection.

Inspection and repair on FLENDER SDA160 gearbox

Scope of work:

- Visually check the cabinet for cracks, where possible.
- Visually checking the preservation internally and externally.
- Checking the holes for damage and dimensions.
- Checking the drillings for alignment deviations on the boring bench.
- Checking the flatness (fit) of the division planes

- Checking condition of the toothing of all gear transmissions
- Checking the bearings for damage phenomena.
- Checking bearing images and flank clearance of all gear transmissions.
- Checking the shaft sizes for the bearings, oil seals, gears and couplings on dimensions and damage.
- Checking the axles for sway.
- Checki

Inspection and repair on BUHLER EX-141 E/325 gearbox

Inspection and repair on ZAMBELLO gearbox

Recommendations are:

-To continue vibration measurements and oil analysis according to the planned intervals
-To perform a visual inspection once per year
- If a significant change in oil composition, or a change in vibration levels or fault frequencies is detected, perform a visual inspection.

Inspection and repair on NKM gearbox

Scope of work:
- Inspection of the spare parts, comparison with the old set;
- Measurements of the spare parts, bearing distance and bearing fit;
- Inspection of worm-shaft and -wheel; • Inspection and disassembly of the remaining parts;
- Replacement of all bearings;
- Assembly of the gearbox on board the ship;
- Check the axial clearance of the tapered roller bearings;
- Assembly of the input coupling;
- Assembly of the output pinion;
- Assembly of the grease system;
- Check the backlash between the output pinion and the swivel gears;
- Test run of the gearbox.

Inspection and repair on HANGZOU ADVANCE GEARBOX GWC 6066 gearbox

Scoop of work:

- Repair Propulsion gearbox malfunction of input shaft, gearwheel side bearing.

During this repair the bearing input-shaft (gear wheel side) was damaged. All the roller-bearings of this gearbox are renewed. The 1st and 2nd stage gearwheels and output shaft white-metal bearings are manually dressed up.

Micro pitting is a phenomenon that can be found on (hardened) gears. Multiple factors can affect the development of micro pitting, most important factors are surface roughness, lubrication or an incorrect gear mesh. The damage shows itself by a matted grey colour of the teeth. This as outcome of surface fatigue. The development

Inspection and repair on FLENDER SDN-250 gearbox

External:
- Visually check the gearbox for cracks, where possible.
- Visually checking the preservation internally and externally.
- Checking the holes for damage and dimensions.
- Checking the drillings for alignment deviations on the boring bench.
- Checking the flatness (fit) of the division planes.

Internal:
- Checking condition of the toothing of all gear transmissions.
- Checking the bearings for damage phenomena.
- Checking bearing images and flank clearance of all gear transmissions.
- Checking the shaft sizes for the bearings, oil seals, gears and couplings on dimensions and damage.
- Checking the axles for sway. - Chec

Inspection and repair on FLENDER DMG2 25.4 gearbox

Short term action

- Order new input shaft bearings. One QJ axial bearing and two double row spherical bearings.
- Order a complete set of gearbox bearings if the bearing life is close to or exceeding 80.000 running hours.
- Take vibration data on a weekly base.

Inspection and repair on THYSSENKRUPP KDN 400 gearbox

This describes the findings of the inspection of the gearbox of the plate belt. The client commissioned GBS to carry out a visual inspection.

The state of the gearbox is rated as good. No significant damage has been found. The wear images of the various parts are fine.

- The observed foamy substance is probably the result of saponification of the oil, this is a chemical reaction of water with oil. The presence of water in the oil is probably caused by poor ventilation in combination with a low operating temperature.

Recommendations:

- It is recommended to change the oil and remove the foamy substance, and to check the air filter.
- It

Inspection and repair on KELLER AN725 gearbox

GBS international was invited to analyze and repair the damages in cooperated with the crew on board at Zeebrugge in Belgium.

Inspection and repair on RENK HSUSL-1020 gearbox

Recommendations

- It is essential to recondition (lasercladding) the shaft journal of the pto-shaft, in order to help prevent future damage to the bearing(s) and gearbox as a whole
. - Keeping the running hours into consideration (> 50.000 h.)
- it is recommended to open the complete gearbox for an extensive inspection and replace all the roller bearings and seals;
- Replace oil filter elements as instructed in the oil filter manual;
- It is recommended to check the oil filters and clean the oil filters regularly as instructed in the oil filter manual;
- It is recommended to perform a visual inspection and oil analysis annually to monitor the micropittin

We got invited to do an inspection on a leaking gearbox in a wind turbine.

In case that the leakage is still not solved, it may take some time for the chamber on the hub side to be filled with oil again. It is therefore recommended to:

- Check the wind turbine for oil leakage again after a couple of days / after a week
- Keep inspecting the wind turbine for oil leakage for some time

If no leakage is observed after this period then the problem is solved. It has also been noted that the pitch pipe is not in line with the hollow shaft through the gearbox, it seems to be rubbing on the bottom of the hollow shaft (see appendix A, pictures 4 and 5). The pitch cilinder was also not in line with the pitch pipe. It is th

Inspection and repair on RENK SHH 11 1135,1/760 gearbox

This client from Norway came to us with this RENK SHH 11 1135,1/760. We inspected the gearbox and performed a repair. After a succesful testrun we shipped the gearbox back to the client.

Upon arrival on the vessel in Rotterdam, preparations were made to disassemble the gearbox. Only upon arrival at anchorage in Scheveningen the disassembly could be started.

The gearbox showed no signs of serious damage or wear, beside normal wear on bearings and impact marks on the gears, from running without load. The intermediate shaft driven-end bearing however was found heavily damaged, most likely caused by slipping of the rollers/bearing.

It is suspected that

Inspection and repair on RENK gearbox

Scope of work:

- Replacement of input and output shaft;
- Replacement of radial and axial bearings;
- Check of the axial clearance of all bearings;
- Assembly of the gearbox;
- Replacement of input and output shaft
- Balancing of the output shaft with new torn carrier.
- Replacement of input shaft radial and axial bearings.
- Make a blue print of the new bearings. These were found acceptable.
- Replacement of output shaft radial and axial bearings.
- Make a blue print of the new bearings. These were found acceptable.
- Adjustment of axial clearance input and output shaft by grinding the distance ring behind the axial bearings.

Inspection and repair on RENK SHH 11 1135,1/760 gearbox

GBS was invited to perform the below mentioned activities on board a vessel:

- Taking out the intermediate shaft with od box and input gearwheel
- Disassembly of vulkan elements with the intermediate shaft out of the input gearwheel
- Overhaul of the generator gearbox
For the testrun is agreed that the crew of the ship will carry out.
The testrun will be for four hours, the test run was explained to the super intended and the cheef mechanic.

Inspection and repair on JAHNEL-KESTERMANN WD-A4S1520 gearbox

We performed inspections onboard a vessel. Location, Chennai, India

Performed inspections:

- Dredge pump gearbox (submerged)
- PS inboard dredge pump
- SB inboard dredge pump
- Cutter gearbox
- Side wire winch PS

Inspection and repair on JAHNEL-KESTERMANN WD-A4S1520 gearbox

Inspection and repair on Inspection of various gearboxes at Sierra Leone gearbox

Inspection and repair on REGGIANA gearbox

Scope of work:

- Full disassembly and cleaning of all parts.
- Inspection and report.
- Assembly and testing of the gearbox

Inspection and repair on SEISA DPP240H gearbox