valutazioni - 5, GPA: 4 ( )

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See Installing and Changing Spray Tips (page 12). Pump running too long without spraying Never run pump more than 10 minutes without spraying. Running pump dry Do not run pump without water. Strong surging at inlet and low pressure on discharge side Foreign particles in inlet or discharge valve or worn inlet and/or discharge valves Clean or replace valves. Water spitting out of thermal valve Pump running too long without spraying Trigger gun to get fresh, cooler water in pump. Note: For complete pump repair and design information see website: 18 309828 Pump Service Repair kits are available. See the Parts Lists (page 21). For the best results, use all parts in the kits. Perform Pressure Relief Procedure (page 7). Servicing Valves Discharge Valves: Disassembly 1. Remove valve cap. 2. Inspect valve cap o–ring for damage. Replace if necessary. 3. Using a needle nose pliers, remove valve. 4. Use a small probe to move the poppet up and down to assure it is functioning properly. 5. Inspect for any debris that may be lodged between poppet and seal. 6. Remove valve seat o–ring and inspect for damage. Assembly 1. Install valve seat o–ring squarely into bottom of manifold. 2. Insert valve assembly squarely into port, pushing it into o–ring. 3. Install valve cap and torque to 443 in.–lbs (37 ft–lbs). Inlet Valves Disassembly 1. Remove manifold. 2. Remove low–pressure seals by inserting a flat screwdriver under seal lip and lifting up. 3. Using a reversible pliers, carefully remove packing retainers (plunger guides). Note: Packing retainers can be reused if not worn. 4. Remove high–pressure packing by pulling straight out with your finger. 5. Pull out valve cage/head ring assembly, valve poppet, spring and o–ring. 6. Inspect for debris and/or damage. 7. Remove valve o–ring. Assembly 1. Install valve seat o–ring squarely into bottom of manifold. 2. Insert valve assembly and push squarely into o–ring. 3. Install high–pressure packing by placing it into cylinder at an angle and then pushing into place. Note: The point of the “v” or flat side of packing is pointed at you. 4. Lubricate packing retainer o–ring with a light film of oil and install it into cylinder. 5. Push it completely into place. Note: O–ring will seat just inside manifold and you will hear a slight pop. 6. Insert low–pressure seal by placing it into cylinder at an angle and pushing it into place. 7. Put a thin coat of oil on plungers and packings. 8. Carefully install manifold and torque bolt to 443 in.–lbs (37 ft–lbs). Note: Valve life is dependant on many variables. Hard water, cavitation, corrosion, chemicals and equipment care. The valves are a wear item and need periodic replacement. Worn o–rings or damaged valves will cause pressure loss and pulsations. 309828 19 Packings Disassembly 1. To access water seals for inspection or replacement, remove head of pump. Note: It is important to note the order in which the components of the packing stack are arranged and facing during disassembly. 2. Remove head bolts. 3. Insert a small pry bar between head and body at opposite corners and apply pressure down on one pry bar and up on the other pry bar. 4. Lift head up and away from body. Note: Packing stack will not always stay in head of pump when it is removed. Sometimes one or more components of the packing stack will come out of the head and stay on the plunger. 5. To remove any components that stay on plungers twist back and forth while pulling up. 6. Remove low–pressure seals by inserting a flat screwdriver under seal lip and lifting up. 7. Remove piston guides from head by using a reverse pliers (preferably rubber coated) inserted into center of piston guide. 8. Use back and forth twisting motion while pulling up (clockwise and counter–clockwise). 9. Another method is to use a two–prong slide hammer puller. Insert prongs into piston guide allowing prongs to grab under support ring, then use slide hammer to pull packing stack up and out of head. Note: Damage to piston guides and or seals may occur during removal. Inspect carefully before reusing any components of packing stack. 10. Remove high–pressure packing by pulling straight out with your finger. Assembly 1. Install high–pressure seal into head. Note: It should fit snugly. The packing support is part of the valve cage. 2. Place high–pressure seal at an angle and work it into cylinder. Note: The point of the “v” or flat side of packing is pointed at you. 3. Lubricate packing retainer o–ring with a light film of oil and install it into cylinder. 4. Push it completely into place. Note: O–ring will seat just inside manifold and you will hear a slight pop. 5. Insert low–pressure seal by placing it into cylinder at an angle and pushing it into place. 6. Put a thin coat of oil on plungers and packings. 7. Carefully install manifold and torque bolt to 443 in.–lbs (37 ft–lbs). Note: Valve life is dependant on many variables. Hard water, cavitation, corrosion, chemicals and equipment care...

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