15
CRANKCASE
1) While inlet manifold, plungers and seal
retainers are removed, examine crank-
case seals for wear.
2) Check oil level and for evidence of water
in oil.
3) Rotate crankshaft by hand to feel for
smooth bearing movements.
4) Examine crankshaft oil seal externally for
drying, cracking or leaking.
5) Consult factory or your local distributor if
crankcase service is needed.
UNLOADER
Unloader o-rings should be examined for
wear and replaced at the same frequency as
servicing the valves and seals of the pump.
If after reasonable use your system cycles
(repeatedly goes on and off by-pass) or will
not come up to pressure you should examine
the unloader for worn o-rings, flow balancer
or ball and valve assembly. Refer to the
“TROUBLESHOOTING” guide for
more information.
To install a new unloader remove discharge
fitting, with check valve and spring, from the
unloader. Reinstall spring, then check valve
into injector. Remount o-ring into injector fit-
ting and thread into unloader discharge.
Discard unloader discharge fitting.
CHEMICAL INJECTOR
The chemical injector should be inspected
when chemical draw will not occur or at the
same frequency as servicing the valves and
seals of the pump. After prolonged use, the
chemical injector orifice may wear or a build
up of soap or other chemical on the ball may
cause the ball to stick in the seat. Flushing
with clear water after chemical application
will generally prevent this. However, after
prolonged use, ball and o-rings may fatigue
and need replacement.
PULSATOR
Special “P” models use a modified Discharge
Valve Adapter in the pump to work with the
Jetter Hose and Tri-Jet Nozzle to create a
pulsating action for added agitation while
cleaning.
Maintenance
of the
Crankcase,
Unloader
and Chemical Injector
