Dewalt DWMIIIFS Instruction Manual - Page 8

WARNING: When working on air tools, note the warnings in this manual and use extra care evaluating problem tools. CAUTION: Pusher spring (constant force spring). Caution must be used when working with the spring assembly. The spring is wrapped around, but not attached to, a roller. If the spring is extended beyond its length, the end will come off the roller and the spring will roll up with a snap, with a chance of pinching your hand. Also the edges of the spring are very thin and could cut. Care must also be taken to insure no permanent kinks are put in the spring as this will reduce the springs force. REPLACEMENT PARTS Use only DeWALT replacement parts. ASSEMBLY PROCEDURE FOR SEALS When repairing a tool, make sure the internal parts are clean and lubricated. Use Parker "O"-LUBE or equivalent on all "O"-rings. Coat each "O"-ring with "O"-LUBE before assembling. Use a small amount of oil on all moving surfaces and pivots. After reassembly add a few drops of DeWALT Air Tool Lubricant through the air line fitting before testing. AIR SUPPLY-PRESSURE AND VOLUME Air volume is as important as air pressure. The air volume supplied to the tool may be inadequate because of undersize fittings and hoses, or from the effects of dirt and water in the system. Restricted air flow will prevent the tool from receiving an adequate volume of air, even though the pressure reading is high. The results will be slow operation, misfeeds or reduced driving power. Before evaluating tool problems for these symptoms, trace the air supply from the tool to the supply source for restrictive connectors, swivel fittings, low points containing water and anything else that would prevent full volume flow of air to the tool. Maintaining The DWMIII Series Tools TO REPLACE PISTON A. Insert the flats on the lower end of the driver piston stem carefully into the end of piston and plunger wrench, BC1009. B. Using another special wrench, BC1009, or another wrench of the proper size, unscrew the plunger from the upper end of the stem. After this is done, it will be possible to lift the poppet off the stem. C. Place the special wrench, BC1009, down over the piston stem onto the driver piston, locking the piston ears in the slots in the wrench. Unscrew the piston from the stem. TO REPLACE DRIVER A. It is not necessary to disassemble the piston-poppet-driver assembly to replace the driver. Pull the poppet up on the driver piston stem as far as it will go. B. Insert special wrench, BC1009, over the driver piston, locking the piston ears in the slots in the wrench. Unscrew the piston from threaded portion of the stem. C. To remove the driver blade from the piston stem, push the driver blade pin out of the stem. This will release the blade. D. Insert new driver blade into the slot in the end of the driver piston stem and assemble the driver blade pin. Test the side play in the driver blade by grasping the driver piston stem in one hand and the blade in the other and moving the blade sideways in alignment with the slot in the stem. There should be a small amount of side play in the blade. This is necessary to take care of any slight misalignment between the blade and guide in the nose. If there is no side play, the blade should 8- ENG