Should a Repairperson use New or Used Hydraulic Cylinders?
If a machine's linkages are the bones, then the hydraulic cylinders are the muscles. They can provide a unidirectional force, either compression or expansion, by electronic command. They offer a smooth response, allowing the operator fine control over motion through a joystick or other controller. Hydraulic cylinders are found in many applications, perhaps most importantly in heavy-duty applications such as construction equipment, manufacturing equipment, and civil engineering applications. Many companies maintain a source of used hydraulic cylinders to allow them to keep all of their machines in operation.
Hydraulic Cylinder Overview
Hydraulic cylinders consist mainly of a barrel and a piston. The barrel is a seamless tube, which holds the cylinder pressure. As the internal pressure behind the piston increases, the piston extends. As the pressure decreases, the piston contracts. The cylinder base cap seals the non-piston end of the cylinder. It attaches to the barrel by a permanent weld, or by threading, tie rods, or bolts. If the cap is not welded, it additionally requires a static seal o-ring to seal the connection.
The cylinder head completes the barrel seal at the piston end. It must support the piston rod mechanically, as well as provide a seal. This seal may be an integrated rod sealing scheme, or there may be an option to accept a seal gland. The head is connected to the barrel in the same way as the base, except that welding is never used. Thus, it is connected with an o-ring as well.
The piston assembly consists of the piston rod and the piston itself. The piston is a pancake-shaped piece of metal, machines with grooves to fit the bearing elements within the cylinder. These elements are high stress points and are designed as either elastomeric or metal seals / bearings. The piston is acted upon in two ways. First, the pressure behind the piston extends the piston and the rod. At the same time, the pressure in front of the piston is reduced, doubling the piston force. To retract the rod, the opposite pressures and resultant forces are applied. For single acting cylinders, the piston is only extended. The contraction comes by load or gravity. Double acting cylinders control pressure for both extension and contraction.
The piston rod completes the assembly. It is often a chrome-plated piece of cold-rolled steel in order to provide for maximum load-bearing properties as well as maximum resistance to corrosion and other factors that would compromise the integrity of the material.
A key component of the hydraulic cylinder assembly is the seal gland. It is often the first point of failure for the assembly. It maintains the integrity of the cylinder pressure as well as keeps the pressurized oil from leaking through the rod / cylinder head interface. Excessive oil leakage is a good indicator of eminent seal failure, and a precursor to complete cylinder failure: the loss of hydraulic power. All other seals, particularly those in the piston / cylinder interface, are also key failure points.
Repairing Hydraulic Cylinders
Hydraulic cylinders do not require regular maintenance. As long as the machine is operated with load specifications, the cylinders should last for a decade or more. However, construction firms usually have to deal with a failed cylinder at some point. When this happens, the company has to decide whether it will try to repair the cylinder or replace it with a new or used part.
Some companies with plenty of cash will opt for the new part, as this can be the highest reliability option. Other companies, which may be strapped for cash, always go for the repair, and suffer the downtime while the repair is being completed. However, for a company with options, it is a good idea to match the solution to the machine.
A smaller company, without a dedicated, experienced mechanic, would do well to avoid the repair route. This keeps the work moving forward without using a worker to stop and repair the machine. A company that does go the repair route will need a more experienced mechanic. Although the repairs are generally straightforward, the work is non-trivial. Any mistakes can have disastrous results, both physically and legally. Having said this, the main decision point is the amount of downtime a company can stand. Repairs will generally involve more downtime. Visit http://www.ehow.com/how_7773434_repair-hydraulic-cylinder.html to get a feel of the requirements for a cylinder repair.
Another factor is whether a new part is still available. An out of stock part may force the company to try to find a used part or repair the existing part. Yet another factor is the machine itself. Does the company intend to keep the machine under heavy use for a few more years, or is it almost ready for retirement? Is the machine starting to experience many problems and reaching the end of its lifetime?
Benefits of Purchasing Used Hydraulic Cylinders
Often, a company with a policy of maximizing value for their equipment maintenance will choose to replace worn cylinders with used ones. They do this to get both the benefits of minimum downtime and minimum repair cost. As long as the mechanic follows a few rules, he or she will be able to effectively maintain the company machinery with used replacement parts.
The first is to put the most effort into finding the correct replacement part. Of course, the best strategy is to find a used version of the original part, but this is not always possible. When it is not, the mechanic must be an expert at choosing an equivalent part, or having an expert that can help make that choice. Many mechanics find that the most effective way to do this is to find a good online source for used hydraulic cylinders and stick with it.
Finding Used Cylinders
Although an online source can be located anywhere, a smart mechanic often limits his or her online search to distributors within a half-day's drive of the repair facility. This allows for rush completions, which generally happen a great deal of the time. For rare or specialty parts, the mechanic can maintain a second source, anywhere in the world, if necessary. Visit http://ezinearticles.com/?Tips-For-Buying-Used-Hydraulic-Cylinders&id=4418847 for tips on finding good sites.
The primary source will be especially effective if they maintain a database of equivalent parts. If they do, the mechanic only needs to enter the original part and manufacturer, and the website can deal with finding the equivalent part. The best sites will guarantee the equivalent part for substitution. By using such an online source, a company can implement a good strategy for machine maintenance and repair by using used hydraulic cylinders.
Where to Find Used Hydraulic Cylinders Online
You can get used cylinders made by Caterpillar®, John Deere®, IHI®, International®, Prentice®, American Roll Off®, Edge®, G&G®, Maxon®, Pioneer, Curbtender®, EZ-Pak®, Heil®, McNeilus®, STS®, Demptster, Gallbreath®, Leach®, and Pakmor®, among other companies.
Often times buying a refurbished part allows you to pay far less for a cylinder than if you were to buy a brand new part. If you are on a tight budget investing in a used option can help you in sticking to your established budget. Used hydraulic cylinders can be used in heavy equipment like excavators, in cars and in industrial machines. When you are shopping for used cylinders it's important that you make sure you are working with a trustworthy private seller or a reputable company. If you are ordering refurbished used hydraulic cylinders make sure you choose a company that supplies you with a product guarantee and a return policy. You can assess the company's trustworthiness by identifying how long they have been in the industry and by reviewing any customer testimonials supplied.
My Little Salesman
My Little Salesman is a website where you can easily find used hydraulic cylinders for sale. Popular used hydraulic cylinders that are available are those manufactured by Prentice®, International®, IHI®, John Deere®, and Caterpillar®. You can search for used hydraulic cylinders based on manufacture or model. Available models include the 1090, 120B, 120G, 120H, 1290T, 12E, 143H, 140M, 140H, 140G, 130G, 12H, and 12G. The used hydraulic cylinders are offered by private sellers. Each cylinder is listed with information about the year, make, model, condition, usage, features, and seller contact details. For more information visit http://www.mylittlesalesman.com/Inventory/Index/4/265/0/0/New-and-Used-Hydraulic-Cylinders-For-Sale?SuperCategoryID=0&advertiserID=0.
Amrep Hydraulics Center
Amrep Hydraulics Center offers repair services for used hydraulic cylinders. The company makes new cylinders and each year the company fixes more than 5000 used hydraulic cylinders. Amrep Hydraulics Center has an 18000 square foot facility. The company supplies you with a one year warranty on every new cylinder that they sell. If you have a rebuildable core the company will exchange the core with a used, rebuilt hydraulic cylinder. The rebuilt cylinders come with a six month warranty. The company has replacement parts for hydraulic cylinders made by Pakmor®, Leach®, Gallbreath®, Demptster®, STS®, McNeilus®, Heil®, EZ-Pak®, Curbtender®, Pioneer®, Maxon®, G&H®, Edge®, and American Roll Off®. For more information visit http://www.amrepinc.com/cylinders.htm.
Tailgate Sales sells a variety of used hydraulic cylinders for lift trucks manufactured by Princeton Machinery. You can find double acting short cylinders ideal for different types of hydraulic presses used for forging and bending. The used hydraulic cylinders are listed by size, length, diameter size, bore, and price. You can purchase the used hydraulic cylinders with credit card, check, or cash. You will be charged shipping when your order is processed; the cylinders are shipped via UPS. For more information visit http://www.anvilfire.com/temp/hydraulic-cylinders.htm.
The cylinder is what transforms energy so that it can be turned into motion and force. The cylinder is made of a piston, rod, and a barrel. The piston is placed inside the barrel and the piston rod is connected to the barrel. The head is where the rod comes out of the hydraulic cylinder. These cylinders are used in vehicles, machines, industrial equipment and more.
There are single rod ended, double rod ended, and single acting hydraulic cylinders available. There are also telescoping cylinders with single and double action, plunger cylinders, cable cylinders, and diaphragm cylinders. You will need to know the rod diameter, the type of hydraulic cylinder you need, the stroke of the cylinder, and the bore diameter when you are ready to place an order.
Surplus hydraulic cylinders are basically cylinders that are left over inventory or excessive inventory that are now being sold at a lower price than initial retail price. These cylinders might be sold because at reduced prices because the store owner needs to make room for more inventory by selling off excessive stock or they could be cylinders that didn’t sell as well as the store owner anticipated. The price of the cylinders are therefore reduced and passed onto you. Some companies buy surplus parts and accessories and then sell them with a fractional markup on the price that the parts were purchased for; again, you can gain the advantage of additional savings if you are in need of a hydraulic cylinder.
The Surplus center sells surplus hydraulic cylinders. Surplus center has 1.9” bore, 2-2.9” bore, 3-3.9” bore, 4.49” bore, 5-5.9” bore, 6-6.9” bore, 7” bore, and larger surplus hydraulic cylinders. The company also sells Trunnion, Tractor Top Link, Telescoping, Rephasing, Power Steering, and Single Acting surplus hydraulic cylinders. Each cylinder is listed with an image and the price. You can sort through listings based on price. For more information visit http://baileynet.com/hydraulics/bailey_hydraulic_cylinders_surplus_info/.
Bailey Surplus buys and sells surplus hydraulic cylinders. This company also buys and sells hydraulic valves, hydraulic motors, bearings, PTO shafts, gear boxes, universal joints, tires, tire wheels, finished goods, engines, mobile products, seats, and lawn, garden and off road equipment. Bailey Surplus has surplus hydraulic cylinders by Maxim, ChiefTC, Prince, CH, and welded cylinders. You can search for cylinders based on cylinder stroke and bore. For more information visit http://www.bbhydraulics.com/oscommerce/.
Groban Supply Company
The Groban Supply Company buys and sells surplus hydraulic cylinders. Available cylinders are listed by bore, stroke, description and price. The Groban Supply Company has a wide selection of surplus hydraulic cylinders to choose from and the company also sells air conditioners, generators, alternators, fans, blowers, pneumatic compressors, electrical equipment, engines, and generator sets. You can also find surplus transformers, pumps, power transmissions, motors, mufflers, silencers, military equipment, lighting, and hydraulic equipment. For more information visit http://www.groban.com/Hydraulic_Cylinders_Double_Acting.html.