10
Valve Assembly and O-Ring Replacement
MAINTENANCE AND AD-
Pump Maintenance
After a chemical and water mixture
has been used with the washer/sprayer,
the pump should be operated at working
pressure with clean water for a few
minutes. Afterwards, let the pump
pressure drop to zero and operate the pump
without liquids for two minutes. Running
the pump without liquids can be accom-
plished by completely emptying the tank or
closing the inlet valve and removing the
strainer
.
If the pump will experience
freezing conditions, empty the pump
completely. If the pump will be stored for
long periods, some of which will be under
Diaphragm Replacement
The pump diaphragms should be changed
after every 500 hours of use. When replacing di-
aphragms, follow these steps referring to the dia-
gram:
1) Drain the oil from the pump by removing the
cap from the oil site glass, removing the pump
mount bolts and loosening the necessary hoses.
Turn the pump upside down and rotate the
crankshaft until oil stops flowing out.
Occasionally debris can cause the valves to
not seat properly or damage o-rings. To check this
problem follow these steps, referring to diagram.
1)
Remove valve cover, valve assembly and
O-rings.
2)
Check the valve assembly for debris and both
the valve assembly and o-rings for wear.
3)
Replace parts as necessary consulting the parts
list for valve or o-ring part numbers.
freezing conditions, an extra precautionary measure is to flush the pump with a 50/50 anti-freeze and
water mixture.
The pump has an internal pulsation dampener which aids in smoothing out the discharged liquid
flow. The pressure in this dampener is set and checked through an air valve stem located at the front of
the pump. The pressure should periodically be checked using an automotive air gauge without pump
running. As a general rule, set pulsation dampener to 1/3 the working pressure without exceeding
100
psi.
For example
: if the pump will be operated from
300-700
PSI, the pulsation dampener pressure
should be set
100
PSI.
AIR VALVE
STEM
PUMP HEAD
VALVE COVER
VALVE COVER
VALVE ASSEMBLY
VALVE
ASSEMBLY
PISTON
DIAPHRAGM
PUMP HEAD
