The History of Rammer/Sandvik Hydraulic Breakers
Rammer Hydraulic Hammers were, although some still are, made by a Swedish company called Sandvik. Rammer, or Sandvik, has cooperated with Allied hydraulic breakers for quite some time. Many of their hoe rams were branded as “Allied/Rammer”. We are unsure of all of the facts, but it appears that recently all three well-known names, Allied, Rammer, and Sandvik, are now under the Sandvik umbrella.
Nearly all of their early models were considered to be fully hydraulic hammers. The hydraulic design of hoe rams do not use nitrogen to make its power. Instead, it uses hydraulic power to lift the piston before the strike, as well as hydraulic power and momentum to bring the piston down on each strike. All fully hydraulic breakers utilize a nitrogen filled accumulator at the top to absorb internal hydraulic spikes. These accumulators have a diaphragm inside, which requires charging and replacement from time to time. There is no such thing as a permanently sealed hydraulic accumulator, despite marketing material to the contrary. If it did, the nitrogen accumulators would not have a port or require a charge kit to add nitrogen. Other fully hydraulic hammer designs are used by Tramac, Montabert, Indeco, Sandvik, and early Caterpillars.
The Evolution of Rammer Rock Breakers
All of the larger, and almost all of the smaller, Rammer hoe rams and rock breakers were of a boxed or silenced design. Rammer, or Allied Rammer, hydraulic hammers use the boxed design which essentially have the power cell/main body completely encased within a steel box from top to bottom that is wedged by various buffers and pads. Although boxed designs are quieter than their side-plated counterparts, the Rammers, like the early Caterpillar, Tramac, Montabert, and Indeco, require that the entire top bracket of the hydraulic hammer be removed in order to check the nitrogen chamber. NPK has recently come out with their own boxed design. There are a very few of these boxed hoe ram designs that will allow nitrogen checks to be done externally, but all of them require the complete removal of the hammer top bracket in order to replace the accumulator diaphragms-which do wear out. Gorilla’s GXS series of hydraulic hammers utilizes a boxed, or silenced design but has a service cover that can be removed to not only perform 15-minute nitrogen checks, but also offers complete access to completely service the accumulator and its diaphragm without removing the top bracket, allowing for easy field service.
The early series of Rammer hammers were known as the E, S and G series. Later models were known as the M series, HR series, and BR series. In recent years, Sandvik has added a Bretec hydraulic hammer, which appears to use a side type nitrogen accumulator.
Gorilla carries demolition tools and working steel in chisel moil and blunt shapes to fit all series of Rammer hoe rams, rock breakers and hydraulic breakers. We can also save you money on our own brand of Gorilla aftermarket hydraulic hammer parts trusted by our own Gorilla Service Team™ in our guaranteed repairs and remanufactured breakers. We stock upper and lower bushings, seal kits, tie rods , side bolts , diaphragms , tool retainers and more to support your Rammer. Rammer hydraulic hammers, especially the mid-sized and larger ones, require specialized tie rod torque procedures. We have repaired hundreds of them, so if you are looking for Rammer hydraulic hammer repairs or rebuilding, give us a call today.
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WE HAVE ACCUMULATED A HUGE INVENTORY OF OEM RAMMER AND ALLIED DEMOLITION TOOLS IN CHISEL, MOIL, AND BLUNT SHAPES, AS WELL AS SPARE PARTS THAT WE ARE NOW CLEARING OUT AT 50% OF MORE OFF TO FIT THE FOLLOWING: