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PROBLEM
Pump fails to operate
Pump operates but:
–output low on
both strokes
–output low on
downstroke
–output low on
upstroke
Erratic or accelerated
pump speed
To clear the pump, follow the Pressure Relief Procedure Warning, on page 8. Disconnect the fluid line. If the
*
pump starts when the air is turned on, then the fluid hose or spray gun is obstructed.
** Be sure there is a vertical loop in the air line drop hose from the main air supply line. Also use an air and moisture
separator to minimize moisture in the air line.
TROUBLESHOOTING GUIDE
CAUSE
Restricted line or inadequate air
supply
Insufficient air pressure, closed or
clogged air valves, etc.
Obstructed fluid hose or spray gun
Fluid dried on the displacement rod
Dirty or worn air motor parts
Air motor icing
Restricted line or inadequate air
supply
Insufficient air pressure, closed or
clogged air valves, etc.
Obstructed fluid hose or spray gun
Bleeder valve open
Air leaking into supply drum
Fluid too heavy for pump priming
Worn throat packings in
displacement pump
Air motor icing
Fluid too heavy for pump priming
Held open or worn piston valve or pack-
ings
Air motor icing
Held open or worn piston valve or packings
Air motor icing
Exhausted fluid supply
Fluid too heavy for pump priming
Held open or worn piston valve or packings
Held open or worn priming piston
Worn throat packings in
displacement pump
Air motor icing
SOLUTION
Clear; see TECHNICAL DA TA on pages
21–25.
Open, clear.
Clear.*
Clean. See SERVICE.
Clean. See air motor manual, supplied.
Reduce air line moisture content. **
Clear. See TECHNICAL DA TA on pages
21–25.
Open, clear.
Clear.*
Close.
Check inductor or ram plate seal.
Use bleeder valve (see page 7). Use inductor
or ram unit.
Replace gland/packing stack.
Reduce air line moisture content.**
Use bleeder valve (see page 7). Use inductor
or ram unit.
Clear valve;
replace gland/packing stack.
Reduce air line moisture content.**
Clear valve;
replace gland/packing stack.
Reduce air line moisture content.**
Refill and prime.
Use bleeder valve (see page 7). Use inductor
or ram unit.
Clear valve;
replace gland/packing stack.
Clear; service.
Replace gland/packing stack.
Reduce air line moisture content.**
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