Paasche BUHF-PL User Manual

BUHF-

High Volume Low Pressure
Manual Spray Gun

OPERATING INSTRUCTIONS & REPLACEMENT PARTS

INSTRUCTIONS AND PARTS LIST BUHF-8/31/2011

Supersedes Instructions & Parts List BUHF-10/2007

WARNING: Spray materials may be harmful if inhaled or
allowed to come into contact with the skin or eyes. Consult
the product label and Material Safety Data Sheet supplied
for the spray material. Follow all safety precautions.
CAUTION: Well Ventilated Area Required to remove
fumes, dust or overspray. Secure airhose and fluid
hose wrench tight for safety and to prevent leaks.

Maximum Controlled Line Air Pressure 50 P.S.I.
M a x i m u m F l u i d P r e s s u r e 4 5 P. S . I .

DESCRIPTION:
BUHF- Manual Spray Gun is for use with Light to Medium

consistency materials. Best spray results are achieved
using pressure fluid feed, although gravity and siphon cups
can also be used. These models require 3 to 10 C.F.M. @
20 to 50 P.S.I. air pressure depending on size of Spray
Head Components selected and material being sprayed.

SPECIAL NOTE: HVLP Spray Head with U-3609 Air Inlet
Tube required for High Volume Low Pressure operation.

AIR CONNECTIONS:

This model has 1/4'' N.P.T. Air Inlet.

1. Open air control valve and blow out Air Hose to
remove any foreign particles that may be in airline.
Secure air hose so it doesn’t injure anyone during
purging.

2. Connect air hose to U-3609 Air Inlet Tube on the

BUHF- Bottom Air Inlet Model.

FLUID CONNECTIONS:

This model has 3/8'' N.P.T. Fluid Inlet.

1. For Siphon Feed, attach siphon feed cup to bottom
inlet of Fluid Body Assembly.

2. For Gravity Feed, loosen U-58 Nut and then turn fluid
inlet of Fluid Body Assembly to top of Spray Gun and
connect Gravity Feed Cup. Tighten U-58 Nut.

3. Pressure Fluid feed operation requires that you
attach one end of fluid hose to approved ASME
pressure tank and the other end to the fluid inlet on
the Fluid Body Assembly (Recommended Method).

MATERIAL:

1. Mixture should be to the consistency
recommended by the manufacturer.

2. Strain all materials through a cloth or fine wire
mesh prior to using to insure all foreign particles
have been removed.

SPRAY HEAD:

1. Spray Head (Fan Pattern) (HIGH VOLUME LOW
PRESSURE) has maximum head pressure of 10

P.S.I. when controlled line pressure does not
exceed 50 P.S.I. and requires the use of a U-3609
Inlet Tube.

OPERATION:

Adjust 200-17 Fluid Knob on BUHF- (Bottom air inlet)
Models to regulate the flow of material through the Spray
Gun.

Grip Spray Gun as you would a pistol, place two fingers on
the trigger. The first one quarter inch pull releases air only
and is used for cleaning by dusting surfaces before
painting. Continued pull on the trigger retracts the Fluid
Needle and allows maximum fluid passage.

Begin Painting by applying as light a coat as possible. Take
long strokes from side to side releasing the trigger at the end
of each stroke. For average work, hold head of Spray Gun
6 to 8 inches from the surface; for narrow lines, use short
trigger pull and hold Spray Gun closer to the surface. To get
wider spray patterns, draw Spray Gun away from surface
gradually while trigger is pulled back until desired width of
pattern is obtained. Practice before spraying on your project
is always advisable.

CARE AND CLEANING:

Flush clean solvent through the fluid passages of the Spray
Gun and wipe off the outside. Never leave the entire Spray
Gun immersed in solvent or the leather packings will dry out.
Dirty Aircaps and Tips should be cleaned out by soaking in
solvent and then blown clean with air. Never use wire
objects to ream out the holes in aircaps or tips as this will
damage these items. Always follow safety instructions on
cleaning solvents being used and remember to keep your
containers closed in a safe location.

Paasche Airbrush Company

4311 North Normandy Avenue
Chicago, IL 60634-1395

Phone: [phone] • Fax: [phone]

Website: paascheairbrush.com
E-Mail: [e-mail]

Printed in the U.S.A.

BUHF- Manual Spray Gun
High Volume Low Pressure

BUHF- (HVLP) Spray Gun Components

No. Part No. Description

1. U-2-3/8 Needle (Not included on UH-1858-1/4)

2. BU-7B Fluid Body

U-3500 Packing Set

3. U-28-12 Packing Washers (4)

4. U-29 Packing Gland

5. DU-30 Spring

6. U-31 Spring Seat

7. U-33 Spring

UH-1858-1/4 Handle & Shell Assembly

8. U-2153 Retaining Ring

9. U-58 Nut

10. U-755 Link Sleeve

11. U-828 Hook

12. U-856 Trigger & Hook Screw

13. U-1322A Link Assembly

14. U-35 Trigger Link Screw

15. U-1671 Trigger

16. U-2154A Shell Assembly

17. U-762 Air Valve Piston

18. U-2520P Air Valve Head

19. U-2500 Spring

U-2106B Fluid Control Assembly

20. U-2631 Plunger

21. U-2750 Packing Gland

22. AE-43 “O” Ring

23. U-2069B Rear Cap

24. 200-17 Fluid Knob

25. U-1702 Valve Spring

Page 2

Special Tips & Needles

• US-2 or 4 Self Cleaning tip §

(Select Size)

US-2-2-3/8 Self Cleaning Needle §
US-4-2-3/8 (Match Tip Size)

Self Cleaning feature clears tip orifice every
time needle is pulled back for spraying.

CONTAINERS: 47SCJ, 30SC, 31SC, 34SC, 35SC and 50P,
other sizes available - Bulletin C & B.

26. U-1890P Plastic Handle (Polypropylene)

27. U-3609 Air Inlet Tube (Required on BUHF-Model)

HVLP- EXTERNAL FAN PATTERN

• Sizes: 000, 00, 0 or 2

28. BFHA- Fan Aircap (Select Size)

29. BU-12 Aircap Nut

30. U- StainlessTip (Select Size)

59-28 PTFE Packing Assembly (Optional)

31. U-3353 Packing PTFE (1)

32. 59-24 Packing PTFE (2)

33. 59-25B Packing Expander (1)

34. DU-30 Spring

50P QT. SIPHON CUP

Gun Not Included