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ALATAS Marine Engineering (S) Pte Ltd carries out TOBU Grab overhaul at Anchorage and in the Workshop

 

The vessel has on board 4 pieces Electro Hydraulic Grabs, make TOBU JUKOGYO, type EHSH 120/60 (12/6 M3). On all grabs the hydraulic grab cylinders where leaking and the cylinder pins and Grab Zylinder eye pieces were severely worn and out of shape.

ALATAS Marine Engineering deployed a team of factory trained grab mechanics to remove the cylinders & pins on anchorage. The cylinders then where sent to AME(S) workshop ashore for a complete cylinder overhaul, including chroming of the piston rod and honing of the cylinder barrel. New bearing bushes where manufactures and inserted into the cylinder eye-pieces and the cylinders were pressure tested with 240 Bar on the piston side and 120 Bar on the ring side.

The repaired and function tested cylinders then were re-installed, and the grabs where fully function tested and adjusted.

Besides repairing TOBU Grabs, FUKUSHIMA Grabs, ORTS Grabs, KOCATAS and GUVEN Grabs, ALATAS also is the authorized service station for SMAG Peiner Grabs:

http://www.alatas.com/grabs/index.htm

 

 

 

       
Vessel
Before dismantle the hydraulic cylinders, all the 4 grabs function tested
The 7 cylinders 14 pins centre part welded with the nuts to apply hydraulic force to pull.
Applying hydraulic force by hand pump and jack to remove the pins
       
Preheated the pins

All the pins for the 4 grabs are found badly worn out.

Grabs #1,2,3 and 4

The cylinders pistons eyes were elongated.
       
       
The hydraulic cylinder bottom pin was removed by gouging.
All the 7 hydraulic cylinders dismantled onboard vessel.
The hydraulic hoses c/w fitting badly corroded.
Those corroded hydraulic hoses removed.
       
Replaced new hydraulic hoses (Owner supplied) as follows installed.
Renew the 14 pins (supplied by ALATAS).
The hydraulic cylinders bushing renewed (Supplied by ALATAS) as follows inserted on the cylinder’s eye.
Upon completion of workshop overhaul one by one the 7 hydraulic cylinders installed at the grabs
       

The pressure relief valve and unload valve found leaking while tested.

Replace new Pressure relief valve and unload valve
All the 4 grabs function tested.

The initial pressure while on tested found low (120 bar).Actual working pressure 170 bar

       
   

The relief valve pressure(170 bar ) were adjusted for all the 4 grabs.

All the 4 grabs function tested with ship staff, upon adjusted of relief valve pressure
   
       

 

 

 
 
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