5. Remove the retaining ring and air cap. 6. Unscrew the fluid needle tip with fingers. 7. Dip the end of a soft-bristle brush into a compatible solvent. Do not continuously soak the brush’s bristles with solvent, and do not use a wire brush. 8. Clean the front of the spray gun, using a soft-bristle brush and solvent. 9. Scrub the retaining ring, air cap and fluid nozzle with a soft-bristle brush. To clean out air cap holes, use a small brush. 10. Clean the air cap and fluid nozzle after each use. Do not use metal tools to clean the air cap holes as this may scratch them; scratches can distort the spray pattern. Do not soak the retaining ring in solvent for prolonged periods of time. 11. Thread fluid needle tip on finger tight. Tighten the nozzle securely to obtain a good seal. 12. Install the retaining ring and air cap. 13. Dampen a soft cloth with solvent and wring-out the excess. Wipe off the outside of the spray gun. 3 20 3M™ Series 52 HVLP Automatic Spray Gun Parts Identification 2, 2* 21 3M™ Series 52 HVLP Automatic Spray Gun Parts Identification Item Description Replacement PN 1 Retaining Ring 91-043 2 Air Cap (Composite) 91-009-XXX 2* Air Cap (Aluminum) 91-071-XXX 3 Fluid Nozzle 4 Fluid Fitting 95-025 5 O-Ring 6 Flat Head Screw 7 Air Manifold 95-002 8 Set Screw UH-612/5 (Pack of 5) 9 Philips Pan Head Screw 10 Valve Seal Ball 11 Snap Ring 12 Fan Valve Body 95-014 13 O-Ring 14 Hex Jam Nut 15 Valve Stem 95-015 16 Autogun Body Assembly 95-022 17 Cylinder Seal (U-Cup) 95-018 18 O-Ring 19 Piston 95-005 20 Needle Tip (Delrin®) 91-107-XXX/4 (Pack of 4) 21 O-Ring UH-768/5 (Pack of 5) 22 Needle Shaft 95-010 23 Piston Return Spring 24 Needle Return Spring 25 O-Ring 26 Cylinder Cap (Adjustable) 27 Stainless Steel Ball UH-610 28 Compression Spring 95-013 29 Set Screw UH-691/5 (Pack of 5) 30 Jam Nut UH-824 31 Needle Adjustment Screw 95-007 32 Cylinder Cap (Non-Adjustable) 95-071 33 Plug 95-077 34 Packing Nut 35 Compression Spring 36 Needle Guide 37 O-Ring UH-1405/10 (Pack of 10) 38 O-Ring UH-647/10 (Pack of 10) 39 Seal Housing 95-017 40 Teflon® Seal 95-020/2 (Pack of 2) 41 Seal Nut 95-016 42 Spacer 95-073 43 Quick Disconnect Fitting 80-874 44 Connection – . NPS x 1/8 NPT 80-932 45 Needle Cover 95-102 46 Cylinder Cap (Adjustable) Assembly 95-039 47 Fan Control Assembly 94-041 48 Fluid Packing Kit 91-200 49 Universal Maintenance Kit 95-043 Note: For all part numbers with X, see page 37 * Denotes difference in material 3 22 3M™ Series 55 HVLP Automatic Spray Gun Parts Identification 23 3M™ Series 55 HVLP Automatic Spray Gun Parts Identification IItem Description 1 Retaining Ring 2 Air Cap (Composite) 2* Air Cap (Aluminum) 3 Fluid Nozzle 4 Fluid Fitting 5 Autogun Body Assembly 6 Cylinder Seal (U-Cup) 7 Piston 8 O-Ring 9 Needle Tip (Delrin®) 10 Needle Shaft 11 Needle Return Spring 12 Cylinder Cap (Adjustable) 13 Stainless Steel Ball 14 Compression Spring 15 Set Screw 16 Jam Nut 17 Needle Adjustment Screw 18 O-Ring 19 Air Manifold 20 Set Screw 21 Flat Head Screw 22 Air Inlet Fitting 23 Philips Pan Head Screw 24 Valve Seal Ball 25 Snap Ring 26 Fan Valve Body 27 O-Ring 28 Hex Jam Nut 29 Valve Stem 30 Plug 31 O-Ring 32 Needle Guide 33 Compression Spring 34 Packing Nut 35 Seal Nut 36 Teflon® Seal 37 Seal Housing 38 O-Ring 39 Needle Cover 40 Fluid Inlet Fitting 41 Cylinder Cap (Adjustable) Assembly 42 Fan Control Assembly 43 Fluid Packing Kit 44 Universal Maintenance Kit Replacement PN 91-043 91-009-XXX 91-071-XXX 95-025 95-028 95-018 95-031 UH-768/5 (Pack of 5) 91-107-XXX/4 (Pack of 4) 95-033 UH-610 95-013 UH-691/5 (Pack of 5) UH-824 95-032 95-030 UH-612/5 (Pack of 5) 95-014 95-036 95-077 UH-1405/10 (Pack of 10) 95-020/2 (Pack of 2) 95-017 UH-647/10 (Pack of 10) 95-102 80-932 95-040 95-042 91-200 95-043 Note: For all part numbers with X, see page 37 * Denotes difference in material 3 24 3M™ Series 55ZZ HVLP Automatic Spray Gun Parts Identification 25 3M™ Series 55ZZ HVLP Automatic Spray Gun Parts Identification Item Description Replacement PN 1 Retaining Ring 91-043 2 Air Cap (Composite) 91-009-XXX 3 Fluid Fitting 95-025 4 Delrin® Fluid Nozzle 91-148-XXX 5 Autogun Body Assembly 95-028 6 Cylinder Seal (U-Cup) 95-018 7 Piston 95-031 8 O-Ring UH-768/5 9 Full Delrin® Needle Assembly 95-048-XXX 10 Needle Return Spring 11 Cylinder Cap (Adjustable) 95-091 12 Stainless Steel Ball UH-610 13 Compression Spring 95-013 14 Set Screw UH-691/5 15 Jam Nut UH-824 16 Needle Adjustment Screw 95-032 17 Cylinder Cap (Non-Adjustable) 95-080 18 O-Ring 19 Air Manifold 95-030 20 Set Screw UH-612/5 21 Flat Head Screw 22 Air Inlet Fitting 23 Philips Pan Head Screw 24 Valve Seal...

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