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Overboard and immerse the gun. GUN II can be immersed with or without air pressure. If time does not allow that many warming shots, then it is preferable to immerse the gun with around psi air pressure. NOTE: Some umbilical required to his deployment psi too.
Refer to recommendation of umbilical manufacturer. GUN II is a very robust air gun. Many years of research and development have gone into the design of the gun not only for signal output, but for field reliability. In case of firing in the air, you must immediately replace the item 25 of the G.
Location of the Volume Reducers. Volume Reducer Solenoid Valve. DO Median plan of the Volume Reducers. R Tooling. If you can mount the Half Flanges easily by hand, it means something is wrong, so please check they are not worn out. When possible, store the gun disassembled without the seals. For a few hours standby, it is strongly recommended to copiously rinse the gun with fresh water. Completely dismantled the gun.
Upon disassembly of the gun all seals should be carefully removed Do not keep seals onto part being cleaned. Plunge the concerned parts into the diluted product during 5 min to 30 min. Wipe all the concerned surfaces with a lint free wiper. If the salt remains hard to remove, plunge again parts in the diluted product Evaluate the necessary and acceptable time for the cleaning, but do not leave parts more than 45 min. Do not use Scotch Brite to clean the surfaces.
The aim of this product being to facilitate and decrease the cleaning time. Carefully wash parts with fresh water to remove the entire product before assembly. All assembly work should be carried out in a clean, dry environment. Spend some extra time cleaning the work bench and covering it with paper.
Clean hands and tools before re-assembling the gun. Upon disassembly of the gun all seals should be carefully removed and the metal parts washed in fresh water and thoroughly dried. If there has been excessive compressor blow-by or no oil coalescing filter has been used, pre wash the parts in varsol, mineral spirits paraffin or a proprietary parts washing solvent and blow dry with shop air.
Use a lint free shop wiper. This action is to check for burrs or rough spots that may lead to future trouble. If such burrs or rough spots are found, carefully dress down the area with grit crocus cloth or aluminum oxide dressing paper. This will cause rust and pitting because the surface of the part will become imbedded with particles from the cutting medium. The internal metal parts of the gun have a special anti-friction, corrosion inhibiting coating and care must be exercised to prevent removal of this coating.
The coating, which has a very flat finish in color , will not rub off against the internal Bearings and seals but will burnish to a very bright shiny finish and look as if it is worn off, this is normal. If it is necessary to dress down the part minimum material should be removed and the part must be carefully washed to remove the spent cutting medium. Use the proper tool for the job. Do not clamp any part of the gun in a vise unless aluminum jaws have been installed.
Do not strike any part of the gun with a metal hammer, a plastic "dead blow" hammer is recommended. Never weld or try to re-machine any part of the gun. This is extremely dangerous! This serves two purposes. First it is a final check that all parts are burr free and second this lubricating film helps with the installation of the seals and bearings.
Follow the procedure in the assembly portion of the manual carefully observing the correct positions of the internal parts.
Because of the long interval between servicing the gun it is possible to forget, and to install the parts out of order. From field experience an improperly assembled gun can be fully functional and repeatable, but will fail in time. This leads to unnecessary expense. If after using the G. GUN II for a period of time and extended service intervals are the norm, there are a few things that can be done to prevent possible problems.
First, on the G. GUN II where the large diameter of the central rod is inserted into the end of the casing, spread a very slight amount of Bostik "Black Moly" never seez into the counter bore or onto the end of the rod.
Do not overdo it. A slight amount will prevent any sticking of these two parts when submerged or not disassembled for long periods of time. Do the same on all threaded fasteners to prevent problems. After the assembly has been screwed together hold the coil up to a light and make sure the two parts are completely seated and no light is visible in the crack between them.
Use a spanner of the proper size do not use pliers or an adjustable spanner to bring the two parts fully together.
Do not over do it. A snug fit is all that is necessary. If the two assemblies are screwed together only hand tight there could be damage to the threads of the sub-assembly or coil housing over a very long time. Thread damage does not mean the parts are ruined only that extra care must be exercised when inserting the solenoid into the sleeve. The threads are only used to hold the two parts together until the assembly is installed in the gun.
If the gun is left on deck for extended periods of time the minimum service should be a through fresh water flush. When a project or shooting season is over, we strongly recommend complete disassembly of all the guns and solenoids, a through cleaning as detailed above and the parts should be stored in a disassembled state, with no seal on them. Remember stainless steel is corrosion resistant as compared to carbon steel, it is NOT corrosion proof, it can corrode or pit if the right conditions exists.
Lack of oxygen and the chlorides from sea water are two things that contribute to these conditions. Because of the longevity of the seals and bearings in the gun it is very tempting to keep the seals in the gun during storage.
To save expenses and keep the gun from being damaged it is possible to save the seals and re use them when it is put back into service, but they must be removed from the gun. This can be very tricky logging which seals came from which gun, but it can be done. This practice is only recommended only if spares expenditures must be kept to a bare minimum.
The best practice is to always install new seals and bearings when re commissioning the gun. If the seals and bearings are re used after storage do not expect the same service life as obtained from new parts.
When storing the Solenoids do not pack the pin connector counter bore or firing line connector with grease. When the gun is re-commissioned it is nearly impossible to remove the all of the grease from either the Solenoid or plug and when screwed together the high pressure created will cause damage to the Coil housing potting and the solenoid connector.
As an alternative use LPS 2 to coat all surfaces to prevent corrosion. This must be washed off upon re-assembly as it forms a waxy film. DO NOT spray any petroleum based lubricating solvent into the gun at any time. It is possible for these materials to ignite or "diesel" under high pressure. If extra lubrication is desired pure silicone liquid can be sprayed or injected into the gun without ignition hazard. In summary, the G. GUN II will provide the user with years of trouble free service at a very low maintenance cost and very little down time if treated like the precision instrument it is.
Because of the long mean time before failure of the gun it is very easy to get into the habit of ignoring the equipment and doing no preventative maintenance. When a problem finally occurs it will be one that could have been easily prevented if proper service schedules and service techniques are performed. We strongly recommend keeping a daily log of the gun as to performance and maintenance. Over the years this will become an invaluable diagnostic tool.
If specific questions need to be answered or unique problems that occur that have not been addressed here, please contact either SERCEL Inc. Clean and dry all parts. Assembly is very easy when done in following order. V Clamp and on the Coils are drilled to allow the user to install a wire through, to avoid loosening, if needed.
Install the 2 O'Rings 24 and place G. V Clamp 12 with the 4 Screws 31 and Lock Washers Put the G. When needed, install Volume Reducer 17 on the G. Insert the G. Align slots. Slightly grease the 2 Keys 28 and install them onto the slots of the G. Clamp G. Tighten strongly the 4 Screws 31, until Lock Washers 32 are fully collapsed. Screw the shipping cap on the Air Coupling 5, and tape the exhaust ports to avoid foreign material to enter the gun.
Disconnect the 2 electric jumpers. Disconnect the air line. Put the gun vertically on the floor SV and TB up. Loosen but not unscrew the 4 Screws Remove Half Flanges13 and 14 screwdriver.
Remove the 2 Keys Separate G. Remove Volume Reducer 17 if any. Unscrew the 4 Screws 31 and remove the G. V Clamp Install Bearings, G. Care must be taken not to bend the Bearings too much.
A slight tearing noise may occur: this is OK. Ahead of the Curve. It looks like your browser does not have JavaScript enabled. Please turn on JavaScript and try again. Page Image. Page Content. Contact Us Please contact us for more information about our products, technical support or other services.
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