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7
306–646
TROUBLESHOOTING GUIDE
Pressure
Relief Procedure
To
reduce the risk of serious bodily injury
,
including fluid injec
-
tion,
splashing in the eyes or on the skin, or injury from moving
parts,
always follow this procedure whenever you shut of
f the
pump,
when checking or servicing any part
of the spray/dis
-
pensing
system, when installing, cleaning or changing spray
tips/nozzles,
and whenever you stop spraying/dispensing.
1.
Engage the gun/valve safety latch.
2.
Shut of
f the air to the pump.
3. Close the bleed–type master air valve (required in your
system).
4. Disengage
the safety latch.
5. Hold a metal part of the gun/valve firmly to the side of a
grounded
metal
pail, and trigger the gun/valve to relieve
pressure.
6. Engage
the gun/valve safety latch.
7. Open
the drain valve and/or the pump bleeder valve (re
-
quired
in your system), having a container ready to catch
the
drainage.
8. Leave
the drain valve open until you are ready to use the
system
again.
If
you suspect that the spray tip/nozzle or
hose is completely
clogged,
or that pressure has not
been fully relieved after fol
-
lowing the steps above, VER
Y SLOWL
Y loosen the tip
guard
retaining
nut, nozzle, or hose end coupling and relieve pres
-
sure
gradually
, then loosen completely
. Now clear the tip/noz
-
zle
or hose.
WARNING
NOTE: Check
everything in the troubleshooting guide below before disassembling the pump.
Exhausted
fluid supply
Restricted line or inadequate air supply
Insufficient air pressure, closed or clogged air
valves,
etc.
Obstructed fluid hose or gun/valve
Fluid dried on the displacement rod
Dirty or worn air motor parts
Exhausted fluid supply
Restricted line or inadequate air supply
Insufficient air pressure, closed or clogged air
valves,
etc.
Obstructed fluid hose or gun/valve
Bleeder valve open or worn
Air leaking into supply drum
Fluid too heavy for pump priming
W
orn throat packings in displacement pump
Fluid too heavy for pump priming
Held open or worn intake valve or packings
Held open or worn piston valve or packings
Exhausted fluid supply
Fluid too heavy for pump priming
Held open or worn piston valve or packings
Held open or worn intake valve or packings
W
orn throat packings in displacement pump
CAUSE
Refill and reprime or flush.
Clear; see
TECHNICAL DA
TA
on back cover
.
Open, clear
.
Clear.*
Clean. See
SERVICE.
Clean, service. See air motor manual, supplied.
Refill and reprime or flush.
Clear
. See
TECHNICAL DA
TA
on back cover
.
Open, clear
.
Clear.*
Close; replace.
Check inductor or ram plate seal.
Use
pump bleeder valve (see page 5). Use inductor or
ram
unit.
Replace gland/packing stack.
Use
pump bleeder valve (see page 5). Use inductor or
ram
unit.
Clear valve; replace gland/packing stack.
Clear valve; replace gland/packing stack.
Refill and reprime or flush.
Use
pump bleeder valve (see page 5). Use inductor or
ram
unit.
Clear valve; replace packings.
Clear valve; replace gland/packing stack.
Replace gland/packing stack.
PROBLEM SOLUTION
Pump fails to operate
Pump operates but output
low on both strokes
Erratic or accelerated
pump speed
*To
clear the pump, follow the
Pressure Relief Procedure W
arning,
above. Disconnect the fluid line. If the pump starts when the
air
is turn on, then the fluid hose or gun/valve is obstructed.
Pump
operates but output
low on downstroke
Pump operates but output
low on upstroke