I PROBLEM
DIAGNOSIS AND MAINTENANCE CONT
PROBABLE CAUSE | SOLUTION |
Short cup life (Cont.)
Abrasive material in the fluid being pumped.
Excessive pressure and/or temperature of fluid being pumped.
Improper installation of cups.
Install proper filtration of pump inlet plumbing.
Check pressures and fluid inlet temperature; be sure they are within specified range.
Properly install lip of new cup into
groove on the piston. If not properly in. stalled, the cup will be extruded past th piston. Piston will run eccentric; premature failure will result.
Strong surging a t h e inlet and low pressure on the discharge side.
Overpressure of pumps.
Running pump dry.
Front edge of piston sharp.
Chrome plating of cylinders damaged causing excessive wear of cups. May be caused bv Dumping acid solution.
Foreign particles in the inlet or discharge valve or worn inlet and/or discharge valves.
Reduce pressure.
Do not run pump without water.
Replace with new piston.
Install new cups and cylinders. Pump only fluid compatible with chrome.
:heck for smooth lap surfaces on inlet and discharge valve seats. Discharge valve seats and inlet valve seats. Discharge valve seats and inlet valve seats may be lapped on a very fine oil stone; damaged cups and discharge valves cannot be lapped but must be
.eplaced.
Water leaking from valve stem
IShort piston seal life.
IElectric motorwon't
Irun'
Electric motor stops while spraying
Electric motor runs,
Electric motor labors when starting; blows fuses
Norn piston seal.
.oose stuffing box.
scored piston sleeve.
4brasives in water.
~~~~
'ower cord unplugged, or building circuit use blown.
lverload switch has opened.
'ower cord unplugged, or building circuit use blown.
lverload breaker has opened.
Ixtension cord.
)isplacement pump frozen or gear train lamage.
:aDacitor failure.
3eplace seal assembly.
righten nut.
3eplace hose.
righten.
3eplace piston sleeve.
:lush with clean water.
:heck, replace.
Jnplug power cord', decrease pressure.
:heck, replace.
Jnplug power cord', relieve~pressure- IllOW to cool.
Ion't use more than 100 h of 12 ga ex- ension cord.
lemove and clean.
.haw
leplace capacitor.
'This unit has anoverload breaker built into the switchassembly. If it opens, unplug powercord and let sprayer cool for 30 to 60 minutes. Also, try to correct the cause of overheating. Always use the lowest pressure setting needed.
