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manual abstract
If the safety valve does not allow air to be released when you pull out on the ring, or does not close automatically, it must be replaced. Items to Check/Change Check Tank Safety Valve Before each or daily X use Overall Unit Visual Check X Drain Tank X Check Power Cord for Damage X To ensure efficient operation and longer life of the air compressor unit, a routine maintenance schedule should be followed. The following schedule is geared toward a consumer whose compressor is used in a normal working environment on a daily basis. This compressor is equipped with an automatic reset thermal overload protector which will shut off motor if it becomes overheated. If the thermal overload protector is actuated, the motor must be allowed to cool down before start-up is possible. NOTE: The motor will automatically restart without warn ing if the unit is left plugged in to an outlet with the Auto On/Off switch in the on position Storage For storing the air compressor, be sure to do the following: 1. Turn the unit off and unplug the power cord from the 4. Open the drain valve to bleed all air from the tank. receptacle. 5. Close the drain valve. 2. Remove all air hoses, accessories, and air tools from 6. Store the air compressor in a clean and dry location. the air compressor. 3. Perform the daily maintenance schedule. Troubleshooting Guide The air compressor should be turned off and unplugged from the power source before any maintenance is performed as well as the air bled from the tank and the unit allowed time to cool. Personal injuries could occur from moving parts, electrical sources, compressed air, or hot surfaces. PROBLEM Air leaks at the check valve or at the pressure relief valve. Air leaks between head and cylinder. Air leak from safety valve. Pressure reading on the regulated pressure gauge drops when an accessory is used. Excessive tank pressure. Motor will not start. Thermal overload protector cuts out repeatedly. Excessive moisture in the discharge air. Air leaks from the tank body or tank welds. POSSIBLE CORRECTION A defective check valve results in a constant air leak at the pressure relief valve when there is pressure in the tank and the compressor is shut off. Drain the tank, then remove and clean or replace the check valve. Be sure of proper torque on head bolts. If leak remains, contact a service technician. Operate the safety valve manually by pulling on the ring. If the valve continues to leak when in the closed position, it should be replaced. If there is an excessive amount of pressure drop when the accessory is used, replace the regulator. Adjust the regulated pressure under flow conditions (while accessory is being used). It is normal for the gauge to show minimal pressure loss during initial use of the tool. Move the Auto-On/Off switch to the Off position. If the unit doesn't shut off, unplug it from the power source and contact a service technician. Make sure power cord is plugged in and the switch is on. Inspect for the proper size fuse in your circuit box. If the fuse was tripped, reset it and restart the unit. If repeated tripping occurs, replace the check valve or contact a service technician. 1. Lack of ventilation, room temperature too high. Move to cooler environment. 2. Excessive air usage, compressor too small for this application. Lower rate of consumption. Remove the water in the tank by draining after each use. High humidity environments will cause excessive condensation. Utilize water filters on your air line. Water condensation is not caused by compressor malfunction. Be sure the compressor's air output is greater than your tool's air consumption rate. Never drill into, weld or otherwise modify the air tank or it will weaken. The tank can rupture or explode. Compressor cannot be repaired. Discontinue use of the air compressor. Air Compressor Model 921.166420 Exploded View 36 37 38 39 41 42 43 47 48 49 Air Compressor Model 921.166420 Parts List Ref. Kit Pad Description Quantity Ref. Kit Part Description Quantity No. No. Number No. No. Number 1 E100296 Shroud,F2, Full,Front 1 46 E103622 Tube,Relief,Aluminum 1 2 Screw,M5x 0.8 x 15ram,Left Hand 47 Ferrule,1/4 2 Threads 1 48 Nut,Compression,1/4 2 3 Washer,Lock,M5 1 49 E101362 Valve,Check,90degree,Left 1 4 Washer,Flat, M5 1 50 E103625 Handle 1 5 E100297 Fan,F2 1 51 Tank,ASME 1 6 1 Piston 1 52 E101717 Drain,1/4 Turn 1 7 1 Ring,Piston 1 53 Nut,M6x 1 2 8 1 Cap,Piston 1 54 Washer,Flat,M6 2 9 1 Washer,Flat, M5 1 55 E101037 Isolator,Sears 2 10 1 Screw,M5x 0.8x 16ram,SHCS 1 56 Screw,M6x 1x 20,SHCS 2 11 Bearing,C& U 1 57 Nut,Lock,MIOx 1.25 2 12 Screw,M6x 1 x 35, SHCS 1 58 Wheel,Sears,8 in 2 13 Motor,Oil Free,1.5 hp 1 59 Washer,Flat,MIO 2 14 1 Cylinder,Steel,Coated 1 6O Bolt,MIOx 1.25x35ram,HH 2 15 2 O-Ring,Cylinder 1 61 Hubcap,Sears,Black 2 16 2 Screw,M3x0.4x5ram,HFHS 1 62 Screw,Set,M6 4 17 2 Retainer,InletValve 1 63 Screw,M6x 1x 16ram,SHCS 2 18 2 Valve,Intake 1 64 Washer,Lock,M6 2 19 2 Plate, Valve 1 65 Washer,Flat,M6 2 20 2 Valve,Outlet 1 6...