When replacing the 048-0074M piston/cylinder kit, do not push the piston in the cylinder from below or this will damage the piston ring and void your warranty. ALWAYS pull the connected rod down through the cylinder until it is 1/2 way down the cylinder, then slide the connecting rod down through the aluminum housing and turn crank until the rod will slide over the bearing.
Tighten the connecting rod to the crank to approx. 40-50 in lbs. DO NOT OVER TIGHTEN!
If your eccentric/crankshaft has any wear and your new piston/cylinder kit is not tight on the eccentric/crankshaft, a small amount of your new connecting rod ID may need to be removed. To do this, simply remove the retaining screw of the connecting rod, insert the connecting rod in a vise and take a hacksaw and make a cut where the connecting rod joins together (below the screw you just removed), just one hacksaw blade width. This will allow you to tighten your screw up a little more on the eccentric/crankshaft.
Make sure to keep the air filter (002) clean. Grit will destroy your new piston and cylinder!
We have Coleman Powermate CT4090410 parts here. Whether you need a pressure switch or a whole new pump, we have your parts. Coleman Powermate CT4090410 parts are easy to come by at Master Tool Repair. We have helpful sales team members that can assist you with your repair. We have accessories as well as compressor oil to keep your pump running like a top. We keep the most popular Coleman Powermate CT4090410 parts in stock and we can order most other parts in a matter of a few days. To make ordering easier, we have created the ability for you to order parts by simply enlarging the schematic and then using your mouse to hover over the actual part. You will see the part pop up and are able to order by simply choosing the quantity of parts that you need and adding them to your cart. Make sure to keep spare parts on hand so that your down time will be minimal. If compression is low it's probably due to a damaged Piston/Compression Ring or damaged Reed Valves in the Pump. Even if you're not using your compressor, drain your tank regularly to prevent rust, especially in humid climates.