Troubleshooting; "Force Feeding" Pump - Campbell Hausfeld 3/4 HP UNITS Instrucciones De Funcionamiento Y Montaje

Operating Instructions and Assembly Instructions
Airless Painting Systems
Troubleshooting Chart (Continued)
Symptom
Pump primes and builds
pressure, but does not
maintain pressure once
trigger is pulled
Gun will not shut-off
After moving equipment or
adding paint to bucket, unit
will not prime or spray
Oil in Paint
Fluid leaks other than oil
Symptoms not listed

"Force Feeding" Pump

To remove trash that has been
caught in the valves, the unit can
be force fed. With pump on and
prime/spray knob turned to
"prime" position, pour the
appropriate solvent into the
suction tube and then fold hose
as shown at right. While firmly
squeezing the suction tube, slide
hand down toward the pump
and repeat until pump primes.
Possible Cause(s)
24. Clogged Suction Filter
25. Suction Assembly loose and/or
sealing surfaces are dirty at Inlet
Valve
26. Paint thick due to cold weather.
This problem usually occurs with
Latex based coatings.
27. Inlet Valve and/or Outlet Valve
are worn.
28. Trash caught in Gun Valve
29. Worn Gun Valve
30. Dried paint under gun actuator
31. Suction assembly loose or
damaged.
32. Oil is leaking from between Block
and Hydraulic Housing
33. Diaphragm is damaged
34. Loose connection
35. Contaminated sealing surface
36. Damaged component
Possible product quality issue. (We
would greatly appreciate your
assistance in continuous product
quality improvement)
Corrective Action
24. Remove Suction Filter and clean. Also, refer to Maintenance
section
25. Remove Suction Assembly, clean sealing surfaces and reassemble
hand tight
26. Do not paint Latex coatings in temperatures less than 50°F
(10°C). Refer to paint manufactures minimum painting
temperature recommendations
27. Replace valves. Also, refer to Maintenance section
28. Clean or replace Gun valve. Also, refer to Gun Manual
Maintenance section. This is a very rare occurrence, and will not
occur if filters are properly maintained
29. Replace Gun valve. Also, refer to Gun Manual Maintenance
section. Refer to steps 3-9 in the Preparation section
30. Remove 1/4" nut and gun actuator at rear of gun. Remove dried
paint from around needle and back of actuator. Replace
actuator and 1/4" nut. Set gun trigger position with trigger lock
in locked orientation (tabs horizontal) by the following
instructions: With one hand holding trigger softly against lock,
use a 1/4" nut driver to turn nut in until trigger starts to come
off the lock, then back off the nut (counterclockwise) 1/2 turn.
Pulling the trigger must not open the gun valve when trigger
lock is activated. You should be able to get the actuator to
wiggle slightly with your finger while holding the trigger against
the locked trigger lock.
31. Tighten suction assembly onto inlet valve. Re-prime sprayer. If
problem is not remedied, consult Technical Support.
32. Check hydraulic oil level. Add hydraulic oil if necessary (it is
recommended that this be done by a qualified technician). Check
block bolt torque.
33. New diaphragm assembly is needed. (It is recommended that this
be done by a qualified technician.) Refer to Maintenance Chart
concerning torque settings and type of tools required to
reassemble block onto housing. Refill piston with hydraulic oil.
Correct assembly of internal check valve under diaphragm
assembly is critical to proper operation of the pump – refer to
Parts List or contact technical Support.
34. Clean sealing surface and reassemble per assembly instructions
35. Consult technical support
36. Consult technical support
Call technical support at 1-615-414-3967.
Notes:
• Weather conditions can cause unsatisfactory results when
spraying some coatings.
• High humidity prolongs set, and cure times.
• High temperatures decrease set, and cure times.
• Cold temperatures extend set, and cure times.
• Variations in temperature, and humidity can cause variations
in finish quality.
• Coating manufacturers can recommend additives to resolve
some of these problems, and should be contacted for
assistance with particular problem resolutions.
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