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Replace spark arrestor if screen wires are broken or missing. 7-4. Servicing Optional Spark Arrestor 1/4 in ST-801 942-C / Ref. ST-801 695-A / Ref. ST-189 925-A Tools Needed: 1 OM-486 Page 25 7-5. Changing Engine Oil, Oil Filter, And Fuel Filter Ref. ST-801 942-C / ST-800 395-B / Ref. ST-189 925-A / S-0842 Stop engine and let cool. 1 Oil Drain Valve 2 1/2 ID x 12 in Hose 3 Oil Filter Change engine oil and filter according to engine manual. Close valve and valve cap before adding oil and running engine. Fill crankcase with new oil to full mark on dipstick (see Section 7-2). 4 Fuel Filter 5 Fuel Line Replace line if cracked or worn. Install new filter. Wipe up any spilled fuel. Start engine, and check for fuel leaks. Stop engine, tighten connections as necessary, and wipe up fuel. 1 2 3 4 5 Full Tools Needed: OM-486 Page 26 7-6. Adjusting Engine Speed Ref. ST-801 942-C / ST-800 397-A After tuning engine, check engine speeds with a tachometer (see table). If necessary, adjust speeds as follows: Start engine and run until warm. Turn A/V control to max. Idle Speed Adjustment 1 Throttle Solenoid 2 Mounting Screw Loosen two mounting screws. 3 Governor Arm 4 Carburetor 5 Idle Speed Screw Pull governor arm away from carburetor and hold while making the following adjustment: Turn idle speed screw until engine runs at idle speed (see table). Release governor arm. Place Engine Control switch in Run/Idle position. 6 Carburetor Stop With solenoid energized, slide solenoid until idle speed screw just touches carburetor stop. Tighten solenoid mounting screws. 7 Governor Arm Extension Check for smooth operation, and readjust solenoid position if necessary. Weld/Power Speed Adjustment Place Engine Control switch in Run position. 8 Weld/Power Speed Rod 9 Locking Nut Loosen nut. 10 Adjustment Nut Turn adjustment nut until engine runs at weld/power speed. Tighten locking nut. Stop engine. 11 Sensitivity Spring See engine manual for governor sensitivity adjustment. 2200 ± 100 rpm 3700 ± 50 rpm 1/4, 3/8 in Tools Needed: Left Side 6 10 8 7 1 9 11 3 2 2 4 Top View 5 OM-486 Page 27 Stop engine. When a circuit breaker or fuse opens, it usually indicates a more serious problem exists. Contact a Factory Authorized Service Agent. 1 Circuit Breaker CB5 CB5 protects the 24 volt ac output to Remote 14 receptacle RC1. If CB5 opens, 24 volt ac output to RC1 stops. 2 Circuit Breaker CB6 CB6 protects the 115 volt ac output to Remote 14 receptacle RC1. If CB6 opens, 115 volt ac output to RC1 stops. Press button to reset breaker. 3 Fuse F6 (See Parts List) F6 protects the engine wiring system from overload. If F6 opens, engine will not crank. 4 Fuse F1 (See Parts List) 5 Fuse F2 (See Parts List) Remove side panel. F1 protects the exciter excitation winding from overload. If F1 opens, weld and auxiliary power output stops. F2 protects the stator winding from overload. If F2 opens, weld output stops. Auxiliary power will still be available. Replace any open fuses. Reinstall cover before operating unit. 3/8 in ST-801 945-C / Ref. ST-189 925-A 4 Tools Needed: 2 2 3 7-7. Overload Protection 1 5 7-8. Troubleshooting A. Welding Trouble Remedy No weld output. Check control settings. Check weld connections. Disconnect equipment from auxiliary power receptacles during start-up. Place Output (Contactor) switch in On position, or move switch to Remote 14 position and connect remote contactor to Remote 14 receptacle RC1 (see Sections 4-8 and 5-1). Check fuses F1 and F2, and replace if necessary (see Section 7-7). Have Factory Authorized Service Agent check brushes, slip rings, and field current control board PC2. Trouble Remedy Low weld output. Check control settings. Place Remote Amperage/Voltage switch in Panel position, or move switch to Remote 14 position and connect remote amperage/voltage control to Remote 14 receptacle RC1. Check and clean air cleaner as necessary (see Section 7-3). Check and adjust engine speed (see Section 7-6). Have Factory Authorized Service Agent check brushes, slip rings, and field current control board PC2. See engine manual. High weld output. Check control settings. Check and adjust engine speed (see Section 7-6). Check for obstructed movement of solenoid linkage (see Section 7-6). Have Factory Authorized Service Agent check field current control board PC2. Weld output cannot be adjusted. Check position of Remote Amperage/Voltage switch (see Section 5-1). Have Factory Authorized Service Agent check field current control board PC2. Erratic weld output. Check control settings. Clean and tighten connections both inside and outside unit. Check and secure lead connections to A/V control. Be sure connection to work piece is clean and tight. Remove excessive coils from weld cables. Use dry, properly stored electrodes. Check and adjust engine speed (see Section 7-6). Have Factory Authorized Service Agent check brushes, slip rings, and field current control board PC2. Remote contactor control does not activate contactor. Place Ou...