Hitachi NR90GC Service Manual - Page 20

Insert the stem of fuel cell into the hole of adapter. To attach the metering valve to a fuel cell: (1) Separate the metering valve and the cap from the gas cartridge. Adapter Stem Fuel cell Adapter Stem Fuel cell Fig. 14 (2) Press forward (stem side) and downward on the front side of the metering valve. (3) Press downward on the rear of the metering valve until it seals. Fig. 15 Checking the fuel cell Problem Possible cause Fuel is not sprayed. Fuel is leaked. There is no fuel. Fuel is sprayed but no combustion occurs. The bag in the fuel cell is damaged. Insufficient sealing of the cup and the stem in the metering valve. The nailer is left under a high temperature condition. The nailer is left in direct sunlight or nails are driven continuously. The nailer is left under a low temperature condition. 0ûC or lower temperature Inspection method The metering valve is not set properly. Press the stem five times or more with the fuel cell held upright to check whether fuel is sprayed or not. Fuel is not sprayed when holding the fuel cell upright but sprayed when holding the fuel cell horizontally. Check whether fuel is leaked or not by keeping the stem pressed. The main body is hot due to the combustion heat. The sprayed fuel is in a liquid state. Remedy Set the metering valve properly (the metering valve may be secured by rotating it). Replace the metering valve with new one. Replace the fuel cell with new one. Replace the fuel cell with new one. Replace the metering valve with new one. Cool the main body and the fuel cell. Replace the fuel cell with new one. Warm up the fuel cell. Instruct the customers necessary measures such as putting the fuel cell in a pocket or wrapping the fuel cell in a thermal insulating material. --- 17 ---