Troubleshooting
PROBLEM PROBLEM
PROBLEM
CAUSE CAUSE
CAUSE
SOLUTION SOLUTION
SOLUTION
Loosereversingproximityswitch.
SeePumpsDoNotReverse
Direction,page40.
Loosepistonpackingbolt.
SeePumpsDoNotReverse
Direction,page40.
Pumpsdonotreversedirectionor
pumpsdonotmove.
Faultydirectionalvalve.
SeePumpsDoNotReverse
Direction,page40.
Feedpumppressureistoolow.
Adjustpressuretomaintain100psi
(0.7MPa,7bar)minimum.
Pumpcavitation.
Fluidistoothick.Consultyour
materialsupplierforrecommended
uidtemperaturetomaintaina
viscosityof250to1500centipoise.
Loosereversingproximityswitch.
SeePumpsDoNotReverse
Direction,page40.
Erraticpumpmovement.
Faultydirectionalvalve.Replacedirectionalvalve.
Obstructeduidhoseorgun;uid
hoseIDtoosmall.
Openuidhosetoclearobstruction,
orusehosewithlargerID.
Wornpistonvalveorintakevalvein
displacementpump.
Seepumpmanual.
Pumpoutputlow.
Inadequatefeedpumppressure.Checkfeedpumppressureand
adjustto100psi(0.7MPa,7bar)
minimum.
Fluidleakatpumprodseal.Wornthroatseals.
Replace.Seepumpmanual.
Fluidleakingfrompumpoutlet
rupturedisk.
CheckifheaterandPRESSURE
RELIEF/SPRAYvalve(SAorSB)
areplugged.Clear.Replace
rupturediskwithanewone;donot
replacewithapipeplug.
Nopressureononeside.
Inadequatefeedpumppressure.Checkfeedpumppressureand
adjustto100psi(0.7MPa,7bar)
minimum.
NOTE: NOTE:
NOTE:
Table1isrelatedtotroubleshootingproblem,
“Proportioningpumpdoesnotholdpressurewhen
stalled.”
Table Table
Table
1 1
1
Determine Determine
Determine
Valve Valve
Valve
Leak Leak
Leak
Location Location
Location
B-sidepumppiston
valveisdirtyor
damaged.
B-sidepumpinletvalve
isdirtyordamaged.
A-sidepumpinletvalve
isdirtyordamaged.
A-sidepumppiston
valveisdirtyor
damaged.
Pressure/Material Pressure/Material
Pressure/Material
Imbalance Imbalance
Imbalance
Todeterminewhichcomponentisoutofbalance,
checkthecolorofsomesprayedmaterial.
Two-componentmaterialsareusuallyamixof
lightanddarkuids,sotheunder-proportioned
componentcanoftenbereadilydetermined.
Whenyouhavedeterminedwhichcomponentis
under-proportioned,sprayoff-target,focusingonthe
pressuregaugeforthatcomponent.
For example:
ifcomponentBisunder-proportioned,
focusontheB-sidepressuregauge.IftheB
gaugereadsconsiderablyhigherthantheAgauge,
theproblemisatthegun.IftheBgaugereads
considerablylowerthantheAgauge,theproblem
isatthepump.
334946H 39